text: /*!
   * Ext JS Library 3.4.0
   * Copyright(c) 2006-2011 Sencha Inc.
   * licensing@sencha.com
   * http://www.sencha.com/license
   */
  /**
   * @class Ext.data.Store
   * @extends Ext.util.Observable
   * <p>The Store class encapsulates a client side cache of {@link Ext.data.Record Record}
   * objects which provide input data for Components such as the {@link Ext.grid.GridPanel GridPanel},
   * the {@link Ext.form.ComboBox ComboBox}, or the {@link Ext.DataView DataView}.</p>
   * <p><u>Retrieving Data</u></p>
   * <p>A Store object may access a data object using:<div class="mdetail-params"><ul>
   * <li>{@link #proxy configured implementation} of {@link Ext.data.DataProxy DataProxy}</li>
   * <li>{@link #data} to automatically pass in data</li>
   * <li>{@link #loadData} to manually pass in data</li>
   * </ul></div></p>
   * <p><u>Reading Data</u></p>
   * <p>A Store object has no inherent knowledge of the format of the data object (it could be
   * an Array, XML, or JSON). A Store object uses an appropriate {@link #reader configured implementation}
   * of a {@link Ext.data.DataReader DataReader} to create {@link Ext.data.Record Record} instances from the data
   * object.</p>
   * <p><u>Store Types</u></p>
   * <p>There are several implementations of Store available which are customized for use with
   * a specific DataReader implementation.  Here is an example using an ArrayStore which implicitly
   * creates a reader commensurate to an Array data object.</p>
   * <pre><code>
  var myStore = new Ext.data.ArrayStore({
      fields: ['fullname', 'first'],
      idIndex: 0 // id for each record will be the first element
  });
   * </code></pre>
   * <p>For custom implementations create a basic {@link Ext.data.Store} configured as needed:</p>
   * <pre><code>
  // create a {@link Ext.data.Record Record} constructor:
  var rt = Ext.data.Record.create([
      {name: 'fullname'},
      {name: 'first'}
  ]);
  var myStore = new Ext.data.Store({
      // explicitly create reader
      reader: new Ext.data.ArrayReader(
          {
              idIndex: 0  // id for each record will be the first element
          },
          rt // recordType
      )
  });
   * </code></pre>
   * <p>Load some data into store (note the data object is an array which corresponds to the reader):</p>
   * <pre><code>
  var myData = [
      [1, 'Fred Flintstone', 'Fred'],  // note that id for the record is the first element
      [2, 'Barney Rubble', 'Barney']
  ];
  myStore.loadData(myData);
   * </code></pre>
   * <p>Records are cached and made available through accessor functions.  An example of adding
   * a record to the store:</p>
   * <pre><code>
  var defaultData = {
      fullname: 'Full Name',
      first: 'First Name'
  };
  var recId = 100; // provide unique id for the record
  var r = new myStore.recordType(defaultData, ++recId); // create new record
  myStore.{@link #insert}(0, r); // insert a new record into the store (also see {@link #add})
   * </code></pre>
   * <p><u>Writing Data</u></p>
   * <p>And <b>new in Ext version 3</b>, use the new {@link Ext.data.DataWriter DataWriter} to create an automated, <a href="http://extjs.com/deploy/dev/examples/writer/writer.html">Writable Store</a>
   * along with <a href="http://extjs.com/deploy/dev/examples/restful/restful.html">RESTful features.</a>
   * @constructor
   * Creates a new Store.
   * @param {Object} config A config object containing the objects needed for the Store to access data,
   * and read the data into Records.
   * @xtype store
   */
  Ext.data.Store = Ext.extend(Ext.util.Observable, {
      /**
       * @cfg {String} storeId If passed, the id to use to register with the <b>{@link Ext.StoreMgr StoreMgr}</b>.
       * <p><b>Note</b>: if a (deprecated) <tt>{@link #id}</tt> is specified it will supersede the <tt>storeId</tt>
       * assignment.</p>
       */
      /**
       * @cfg {String} url If a <tt>{@link #proxy}</tt> is not specified the <tt>url</tt> will be used to
       * implicitly configure a {@link Ext.data.HttpProxy HttpProxy} if an <tt>url</tt> is specified.
       * Typically this option, or the <code>{@link #data}</code> option will be specified.
       */
      /**
       * @cfg {Boolean/Object} autoLoad If <tt>{@link #data}</tt> is not specified, and if <tt>autoLoad</tt>
       * is <tt>true</tt> or an <tt>Object</tt>, this store's {@link #load} method is automatically called
       * after creation. If the value of <tt>autoLoad</tt> is an <tt>Object</tt>, this <tt>Object</tt> will
       * be passed to the store's {@link #load} method.
       */
      /**
       * @cfg {Ext.data.DataProxy} proxy The {@link Ext.data.DataProxy DataProxy} object which provides
       * access to a data object.  See <code>{@link #url}</code>.
       */
      /**
       * @cfg {Array} data An inline data object readable by the <code>{@link #reader}</code>.
       * Typically this option, or the <code>{@link #url}</code> option will be specified.
       */
      /**
       * @cfg {Ext.data.DataReader} reader The {@link Ext.data.DataReader Reader} object which processes the
       * data object and returns an Array of {@link Ext.data.Record} objects which are cached keyed by their
       * <b><tt>{@link Ext.data.Record#id id}</tt></b> property.
       */
      /**
       * @cfg {Ext.data.DataWriter} writer
       * <p>The {@link Ext.data.DataWriter Writer} object which processes a record object for being written
       * to the server-side database.</p>
       * <br><p>When a writer is installed into a Store the {@link #add}, {@link #remove}, and {@link #update}
       * events on the store are monitored in order to remotely {@link #createRecords create records},
       * {@link #destroyRecord destroy records}, or {@link #updateRecord update records}.</p>
       * <br><p>The proxy for this store will relay any {@link #writexception} events to this store.</p>
       * <br><p>Sample implementation:
       * <pre><code>
  var writer = new {@link Ext.data.JsonWriter}({
      encode: true,
      writeAllFields: true // write all fields, not just those that changed
  });
  
  // Typical Store collecting the Proxy, Reader and Writer together.
  var store = new Ext.data.Store({
      storeId: 'user',
      root: 'records',
      proxy: proxy,
      reader: reader,
      writer: writer,     // <-- plug a DataWriter into the store just as you would a Reader
      paramsAsHash: true,
      autoSave: false    // <-- false to delay executing create, update, destroy requests
                          //     until specifically told to do so.
  });
       * </code></pre></p>
       */
      writer : undefined,
      /**
       * @cfg {Object} baseParams
       * <p>An object containing properties which are to be sent as parameters
       * for <i>every</i> HTTP request.</p>
       * <p>Parameters are encoded as standard HTTP parameters using {@link Ext#urlEncode}.</p>
       * <p><b>Note</b>: <code>baseParams</code> may be superseded by any <code>params</code>
       * specified in a <code>{@link #load}</code> request, see <code>{@link #load}</code>
       * for more details.</p>
       * This property may be modified after creation using the <code>{@link #setBaseParam}</code>
       * method.
       * @property
       */
      /**
       * @cfg {Object} sortInfo A config object to specify the sort order in the request of a Store's
       * {@link #load} operation.  Note that for local sorting, the <tt>direction</tt> property is
       * case-sensitive. See also {@link #remoteSort} and {@link #paramNames}.
       * For example:<pre><code>
  sortInfo: {
      field: 'fieldName',
      direction: 'ASC' // or 'DESC' (case sensitive for local sorting)
  }
  </code></pre>
       */
      /**
       * @cfg {boolean} remoteSort <tt>true</tt> if sorting is to be handled by requesting the <tt>{@link #proxy Proxy}</tt>
       * to provide a refreshed version of the data object in sorted order, as opposed to sorting the Record cache
       * in place (defaults to <tt>false</tt>).
       * <p>If <tt>remoteSort</tt> is <tt>true</tt>, then clicking on a {@link Ext.grid.Column Grid Column}'s
       * {@link Ext.grid.Column#header header} causes the current page to be requested from the server appending
       * the following two parameters to the <b><tt>{@link #load params}</tt></b>:<div class="mdetail-params"><ul>
       * <li><b><tt>sort</tt></b> : String<p class="sub-desc">The <tt>name</tt> (as specified in the Record's
       * {@link Ext.data.Field Field definition}) of the field to sort on.</p></li>
       * <li><b><tt>dir</tt></b> : String<p class="sub-desc">The direction of the sort, 'ASC' or 'DESC' (case-sensitive).</p></li>
       * </ul></div></p>
       */
      remoteSort : false,
  
      /**
       * @cfg {Boolean} autoDestroy <tt>true</tt> to destroy the store when the component the store is bound
       * to is destroyed (defaults to <tt>false</tt>).
       * <p><b>Note</b>: this should be set to true when using stores that are bound to only 1 component.</p>
       */
      autoDestroy : false,
  
      /**
       * @cfg {Boolean} pruneModifiedRecords <tt>true</tt> to clear all modified record information each time
       * the store is loaded or when a record is removed (defaults to <tt>false</tt>). See {@link #getModifiedRecords}
       * for the accessor method to retrieve the modified records.
       */
      pruneModifiedRecords : false,
  
      /**
       * Contains the last options object used as the parameter to the {@link #load} method. See {@link #load}
       * for the details of what this may contain. This may be useful for accessing any params which were used
       * to load the current Record cache.
       * @property
       */
      lastOptions : null,
  
      /**
       * @cfg {Boolean} autoSave
       * <p>Defaults to <tt>true</tt> causing the store to automatically {@link #save} records to
       * the server when a record is modified (ie: becomes 'dirty'). Specify <tt>false</tt> to manually call {@link #save}
       * to send all modifiedRecords to the server.</p>
       * <br><p><b>Note</b>: each CRUD action will be sent as a separate request.</p>
       */
      autoSave : true,
  
      /**
       * @cfg {Boolean} batch
       * <p>Defaults to <tt>true</tt> (unless <code>{@link #restful}:true</code>). Multiple
       * requests for each CRUD action (CREATE, READ, UPDATE and DESTROY) will be combined
       * and sent as one transaction. Only applies when <code>{@link #autoSave}</code> is set
       * to <tt>false</tt>.</p>
       * <br><p>If Store is RESTful, the DataProxy is also RESTful, and a unique transaction is
       * generated for each record.</p>
       */
      batch : true,
  
      /**
       * @cfg {Boolean} restful
       * Defaults to <tt>false</tt>.  Set to <tt>true</tt> to have the Store and the set
       * Proxy operate in a RESTful manner. The store will automatically generate GET, POST,
       * PUT and DELETE requests to the server. The HTTP method used for any given CRUD
       * action is described in {@link Ext.data.Api#restActions}.  For additional information
       * see {@link Ext.data.DataProxy#restful}.
       * <p><b>Note</b>: if <code>{@link #restful}:true</code> <code>batch</code> will
       * internally be set to <tt>false</tt>.</p>
       */
      restful: false,
  
      /**
       * @cfg {Object} paramNames
       * <p>An object containing properties which specify the names of the paging and
       * sorting parameters passed to remote servers when loading blocks of data. By default, this
       * object takes the following form:</p><pre><code>
  {
      start : 'start',  // The parameter name which specifies the start row
      limit : 'limit',  // The parameter name which specifies number of rows to return
      sort : 'sort',    // The parameter name which specifies the column to sort on
      dir : 'dir'       // The parameter name which specifies the sort direction
  }
  </code></pre>
       * <p>The server must produce the requested data block upon receipt of these parameter names.
       * If different parameter names are required, this property can be overriden using a configuration
       * property.</p>
       * <p>A {@link Ext.PagingToolbar PagingToolbar} bound to this Store uses this property to determine
       * the parameter names to use in its {@link #load requests}.
       */
      paramNames : undefined,
  
      /**
       * @cfg {Object} defaultParamNames
       * Provides the default values for the {@link #paramNames} property. To globally modify the parameters
       * for all stores, this object should be changed on the store prototype.
       */
      defaultParamNames : {
          start : 'start',
          limit : 'limit',
          sort : 'sort',
          dir : 'dir'
      },
  
      isDestroyed: false,    
      hasMultiSort: false,
  
      // private
      batchKey : '_ext_batch_',
  
      constructor : function(config){
          /**
           * @property multiSort
           * @type Boolean
           * True if this store is currently sorted by more than one field/direction combination.
           */
          
          /**
           * @property isDestroyed
           * @type Boolean
           * True if the store has been destroyed already. Read only
           */
          
          this.data = new Ext.util.MixedCollection(false);
          this.data.getKey = function(o){
              return o.id;
          };
          
  
          // temporary removed-records cache
          this.removed = [];
  
          if(config && config.data){
              this.inlineData = config.data;
              delete config.data;
          }
  
          Ext.apply(this, config);
  
          /**
           * See the <code>{@link #baseParams corresponding configuration option}</code>
           * for a description of this property.
           * To modify this property see <code>{@link #setBaseParam}</code>.
           * @property
           */
          this.baseParams = Ext.isObject(this.baseParams) ? this.baseParams : {};
  
          this.paramNames = Ext.applyIf(this.paramNames || {}, this.defaultParamNames);
  
          if((this.url || this.api) && !this.proxy){
              this.proxy = new Ext.data.HttpProxy({url: this.url, api: this.api});
          }
          // If Store is RESTful, so too is the DataProxy
          if (this.restful === true && this.proxy) {
              // When operating RESTfully, a unique transaction is generated for each record.
              // TODO might want to allow implemention of faux REST where batch is possible using RESTful routes only.
              this.batch = false;
              Ext.data.Api.restify(this.proxy);
          }
  
          if(this.reader){ // reader passed
              if(!this.recordType){
                  this.recordType = this.reader.recordType;
              }
              if(this.reader.onMetaChange){
                  this.reader.onMetaChange = this.reader.onMetaChange.createSequence(this.onMetaChange, this);
              }
              if (this.writer) { // writer passed
                  if (this.writer instanceof(Ext.data.DataWriter) === false) {    // <-- config-object instead of instance.
                      this.writer = this.buildWriter(this.writer);
                  }
                  this.writer.meta = this.reader.meta;
                  this.pruneModifiedRecords = true;
              }
          }
  
          /**
           * The {@link Ext.data.Record Record} constructor as supplied to (or created by) the
           * {@link Ext.data.DataReader Reader}. Read-only.
           * <p>If the Reader was constructed by passing in an Array of {@link Ext.data.Field} definition objects,
           * instead of a Record constructor, it will implicitly create a Record constructor from that Array (see
           * {@link Ext.data.Record}.{@link Ext.data.Record#create create} for additional details).</p>
           * <p>This property may be used to create new Records of the type held in this Store, for example:</p><pre><code>
      // create the data store
      var store = new Ext.data.ArrayStore({
          autoDestroy: true,
          fields: [
             {name: 'company'},
             {name: 'price', type: 'float'},
             {name: 'change', type: 'float'},
             {name: 'pctChange', type: 'float'},
             {name: 'lastChange', type: 'date', dateFormat: 'n/j h:ia'}
          ]
      });
      store.loadData(myData);
  
      // create the Grid
      var grid = new Ext.grid.EditorGridPanel({
          store: store,
          colModel: new Ext.grid.ColumnModel({
              columns: [
                  {id:'company', header: 'Company', width: 160, dataIndex: 'company'},
                  {header: 'Price', renderer: 'usMoney', dataIndex: 'price'},
                  {header: 'Change', renderer: change, dataIndex: 'change'},
                  {header: '% Change', renderer: pctChange, dataIndex: 'pctChange'},
                  {header: 'Last Updated', width: 85,
                      renderer: Ext.util.Format.dateRenderer('m/d/Y'),
                      dataIndex: 'lastChange'}
              ],
              defaults: {
                  sortable: true,
                  width: 75
              }
          }),
          autoExpandColumn: 'company', // match the id specified in the column model
          height:350,
          width:600,
          title:'Array Grid',
          tbar: [{
              text: 'Add Record',
              handler : function(){
                  var defaultData = {
                      change: 0,
                      company: 'New Company',
                      lastChange: (new Date()).clearTime(),
                      pctChange: 0,
                      price: 10
                  };
                  var recId = 3; // provide unique id
                  var p = new store.recordType(defaultData, recId); // create new record
                  grid.stopEditing();
                  store.{@link #insert}(0, p); // insert a new record into the store (also see {@link #add})
                  grid.startEditing(0, 0);
              }
          }]
      });
           * </code></pre>
           * @property recordType
           * @type Function
           */
  
          if(this.recordType){
              /**
               * A {@link Ext.util.MixedCollection MixedCollection} containing the defined {@link Ext.data.Field Field}s
               * for the {@link Ext.data.Record Records} stored in this Store. Read-only.
               * @property fields
               * @type Ext.util.MixedCollection
               */
              this.fields = this.recordType.prototype.fields;
          }
          this.modified = [];
  
          this.addEvents(
              /**
               * @event datachanged
               * Fires when the data cache has changed in a bulk manner (e.g., it has been sorted, filtered, etc.) and a
               * widget that is using this Store as a Record cache should refresh its view.
               * @param {Store} this
               */
              'datachanged',
              /**
               * @event metachange
               * Fires when this store's reader provides new metadata (fields). This is currently only supported for JsonReaders.
               * @param {Store} this
               * @param {Object} meta The JSON metadata
               */
              'metachange',
              /**
               * @event add
               * Fires when Records have been {@link #add}ed to the Store
               * @param {Store} this
               * @param {Ext.data.Record[]} records The array of Records added
               * @param {Number} index The index at which the record(s) were added
               */
              'add',
              /**
               * @event remove
               * Fires when a Record has been {@link #remove}d from the Store
               * @param {Store} this
               * @param {Ext.data.Record} record The Record that was removed
               * @param {Number} index The index at which the record was removed
               */
              'remove',
              /**
               * @event update
               * Fires when a Record has been updated
               * @param {Store} this
               * @param {Ext.data.Record} record The Record that was updated
               * @param {String} operation The update operation being performed.  Value may be one of:
               * <pre><code>
       Ext.data.Record.EDIT
       Ext.data.Record.REJECT
       Ext.data.Record.COMMIT
               * </code></pre>
               */
              'update',
              /**
               * @event clear
               * Fires when the data cache has been cleared.
               * @param {Store} this
               * @param {Record[]} records The records that were cleared.
               */
              'clear',
              /**
               * @event exception
               * <p>Fires if an exception occurs in the Proxy during a remote request.
               * This event is relayed through the corresponding {@link Ext.data.DataProxy}.
               * See {@link Ext.data.DataProxy}.{@link Ext.data.DataProxy#exception exception}
               * for additional details.
               * @param {misc} misc See {@link Ext.data.DataProxy}.{@link Ext.data.DataProxy#exception exception}
               * for description.
               */
              'exception',
              /**
               * @event beforeload
               * Fires before a request is made for a new data object.  If the beforeload handler returns
               * <tt>false</tt> the {@link #load} action will be canceled.
               * @param {Store} this
               * @param {Object} options The loading options that were specified (see {@link #load} for details)
               */
              'beforeload',
              /**
               * @event load
               * Fires after a new set of Records has been loaded.
               * @param {Store} this
               * @param {Ext.data.Record[]} records The Records that were loaded
               * @param {Object} options The loading options that were specified (see {@link #load} for details)
               */
              'load',
              /**
               * @event loadexception
               * <p>This event is <b>deprecated</b> in favor of the catch-all <b><code>{@link #exception}</code></b>
               * event instead.</p>
               * <p>This event is relayed through the corresponding {@link Ext.data.DataProxy}.
               * See {@link Ext.data.DataProxy}.{@link Ext.data.DataProxy#loadexception loadexception}
               * for additional details.
               * @param {misc} misc See {@link Ext.data.DataProxy}.{@link Ext.data.DataProxy#loadexception loadexception}
               * for description.
               */
              'loadexception',
              /**
               * @event beforewrite
               * @param {Ext.data.Store} store
               * @param {String} action [Ext.data.Api.actions.create|update|destroy]
               * @param {Record/Record[]} rs The Record(s) being written.
               * @param {Object} options The loading options that were specified. Edit <code>options.params</code> to add Http parameters to the request.  (see {@link #save} for details)
               * @param {Object} arg The callback's arg object passed to the {@link #request} function
               */
              'beforewrite',
              /**
               * @event write
               * Fires if the server returns 200 after an Ext.data.Api.actions CRUD action.
               * Success of the action is determined in the <code>result['successProperty']</code>property (<b>NOTE</b> for RESTful stores,
               * a simple 20x response is sufficient for the actions "destroy" and "update".  The "create" action should should return 200 along with a database pk).
               * @param {Ext.data.Store} store
               * @param {String} action [Ext.data.Api.actions.create|update|destroy]
               * @param {Object} result The 'data' picked-out out of the response for convenience.
               * @param {Ext.Direct.Transaction} res
               * @param {Record/Record[]} rs Store's records, the subject(s) of the write-action
               */
              'write',
              /**
               * @event beforesave
               * Fires before a save action is called. A save encompasses destroying records, updating records and creating records.
               * @param {Ext.data.Store} store
               * @param {Object} data An object containing the data that is to be saved. The object will contain a key for each appropriate action,
               * with an array of records for each action.
               */
              'beforesave',
              /**
               * @event save
               * Fires after a save is completed. A save encompasses destroying records, updating records and creating records.
               * @param {Ext.data.Store} store
               * @param {Number} batch The identifier for the batch that was saved.
               * @param {Object} data An object containing the data that is to be saved. The object will contain a key for each appropriate action,
               * with an array of records for each action.
               */
              'save'
  
          );
  
          if(this.proxy){
              // TODO remove deprecated loadexception with ext-3.0.1
              this.relayEvents(this.proxy,  ['loadexception', 'exception']);
          }
          // With a writer set for the Store, we want to listen to add/remove events to remotely create/destroy records.
          if (this.writer) {
              this.on({
                  scope: this,
                  add: this.createRecords,
                  remove: this.destroyRecord,
                  update: this.updateRecord,
                  clear: this.onClear
              });
          }
  
          this.sortToggle = {};
          if(this.sortField){
              this.setDefaultSort(this.sortField, this.sortDir);
          }else if(this.sortInfo){
              this.setDefaultSort(this.sortInfo.field, this.sortInfo.direction);
          }
  
          Ext.data.Store.superclass.constructor.call(this);
  
          if(this.id){
              this.storeId = this.id;
              delete this.id;
          }
          if(this.storeId){
              Ext.StoreMgr.register(this);
          }
          if(this.inlineData){
              this.loadData(this.inlineData);
              delete this.inlineData;
          }else if(this.autoLoad){
              this.load.defer(10, this, [
                  typeof this.autoLoad == 'object' ?
                      this.autoLoad : undefined]);
          }
          // used internally to uniquely identify a batch
          this.batchCounter = 0;
          this.batches = {};
      },
  
      /**
       * builds a DataWriter instance when Store constructor is provided with a writer config-object instead of an instace.
       * @param {Object} config Writer configuration
       * @return {Ext.data.DataWriter}
       * @private
       */
      buildWriter : function(config) {
          var klass = undefined,
              type = (config.format || 'json').toLowerCase();
          switch (type) {
              case 'json':
                  klass = Ext.data.JsonWriter;
                  break;
              case 'xml':
                  klass = Ext.data.XmlWriter;
                  break;
              default:
                  klass = Ext.data.JsonWriter;
          }
          return new klass(config);
      },
  
      /**
       * Destroys the store.
       */
      destroy : function(){
          if(!this.isDestroyed){
              if(this.storeId){
                  Ext.StoreMgr.unregister(this);
              }
              this.clearData();
              this.data = null;
              Ext.destroy(this.proxy);
              this.reader = this.writer = null;
              this.purgeListeners();
              this.isDestroyed = true;
          }
      },
  
      /**
       * Add Records to the Store and fires the {@link #add} event.  To add Records
       * to the store from a remote source use <code>{@link #load}({add:true})</code>.
       * See also <code>{@link #recordType}</code> and <code>{@link #insert}</code>.
       * @param {Ext.data.Record[]} records An Array of Ext.data.Record objects
       * to add to the cache. See {@link #recordType}.
       */
      add : function(records) {
          var i, len, record, index;
          
          records = [].concat(records);
          if (records.length < 1) {
              return;
          }
          
          for (i = 0, len = records.length; i < len; i++) {
              record = records[i];
              
              record.join(this);
              
              if (record.dirty || record.phantom) {
                  this.modified.push(record);
              }
          }
          
          index = this.data.length;
          this.data.addAll(records);
          
          if (this.snapshot) {
              this.snapshot.addAll(records);
          }
          
          this.fireEvent('add', this, records, index);
      },
  
      /**
       * (Local sort only) Inserts the passed Record into the Store at the index where it
       * should go based on the current sort information.
       * @param {Ext.data.Record} record
       */
      addSorted : function(record){
          var index = this.findInsertIndex(record);
          this.insert(index, record);
      },
      
      /**
       * @private
       * Update a record within the store with a new reference
       */
      doUpdate: function(rec){
          var id = rec.id;
          // unjoin the old record
          this.getById(id).join(null);
          
          this.data.replace(id, rec);
          if (this.snapshot) {
              this.snapshot.replace(id, rec);
          }
          rec.join(this);
          this.fireEvent('update', this, rec, Ext.data.Record.COMMIT);
      },
  
      /**
       * Remove Records from the Store and fires the {@link #remove} event.
       * @param {Ext.data.Record/Ext.data.Record[]} record The record object or array of records to remove from the cache.
       */
      remove : function(record){
          if(Ext.isArray(record)){
              Ext.each(record, function(r){
                  this.remove(r);
              }, this);
              return;
          }
          var index = this.data.indexOf(record);
          if(index > -1){
              record.join(null);
              this.data.removeAt(index);
          }
          if(this.pruneModifiedRecords){
              this.modified.remove(record);
          }
          if(this.snapshot){
              this.snapshot.remove(record);
          }
          if(index > -1){
              this.fireEvent('remove', this, record, index);
          }
      },
  
      /**
       * Remove a Record from the Store at the specified index. Fires the {@link #remove} event.
       * @param {Number} index The index of the record to remove.
       */
      removeAt : function(index){
          this.remove(this.getAt(index));
      },
  
      /**
       * Remove all Records from the Store and fires the {@link #clear} event.
       * @param {Boolean} silent [false] Defaults to <tt>false</tt>.  Set <tt>true</tt> to not fire clear event.
       */
      removeAll : function(silent){
          var items = [];
          this.each(function(rec){
              items.push(rec);
          });
          this.clearData();
          if(this.snapshot){
              this.snapshot.clear();
          }
          if(this.pruneModifiedRecords){
              this.modified = [];
          }
          if (silent !== true) {  // <-- prevents write-actions when we just want to clear a store.
              this.fireEvent('clear', this, items);
          }
      },
  
      // private
      onClear: function(store, records){
          Ext.each(records, function(rec, index){
              this.destroyRecord(this, rec, index);
          }, this);
      },
  
      /**
       * Inserts Records into the Store at the given index and fires the {@link #add} event.
       * See also <code>{@link #add}</code> and <code>{@link #addSorted}</code>.
       * @param {Number} index The start index at which to insert the passed Records.
       * @param {Ext.data.Record[]} records An Array of Ext.data.Record objects to add to the cache.
       */
      insert : function(index, records) {
          var i, len, record;
          
          records = [].concat(records);
          for (i = 0, len = records.length; i < len; i++) {
              record = records[i];
              
              this.data.insert(index + i, record);
              record.join(this);
              
              if (record.dirty || record.phantom) {
                  this.modified.push(record);
              }
          }
          
          if (this.snapshot) {
              this.snapshot.addAll(records);
          }
          
          this.fireEvent('add', this, records, index);
      },
  
      /**
       * Get the index within the cache of the passed Record.
       * @param {Ext.data.Record} record The Ext.data.Record object to find.
       * @return {Number} The index of the passed Record. Returns -1 if not found.
       */
      indexOf : function(record){
          return this.data.indexOf(record);
      },
  
      /**
       * Get the index within the cache of the Record with the passed id.
       * @param {String} id The id of the Record to find.
       * @return {Number} The index of the Record. Returns -1 if not found.
       */
      indexOfId : function(id){
          return this.data.indexOfKey(id);
      },
  
      /**
       * Get the Record with the specified id.
       * @param {String} id The id of the Record to find.
       * @return {Ext.data.Record} The Record with the passed id. Returns undefined if not found.
       */
      getById : function(id){
          return (this.snapshot || this.data).key(id);
      },
  
      /**
       * Get the Record at the specified index.
       * @param {Number} index The index of the Record to find.
       * @return {Ext.data.Record} The Record at the passed index. Returns undefined if not found.
       */
      getAt : function(index){
          return this.data.itemAt(index);
      },
  
      /**
       * Returns a range of Records between specified indices.
       * @param {Number} startIndex (optional) The starting index (defaults to 0)
       * @param {Number} endIndex (optional) The ending index (defaults to the last Record in the Store)
       * @return {Ext.data.Record[]} An array of Records
       */
      getRange : function(start, end){
          return this.data.getRange(start, end);
      },
  
      // private
      storeOptions : function(o){
          o = Ext.apply({}, o);
          delete o.callback;
          delete o.scope;
          this.lastOptions = o;
      },
  
      // private
      clearData: function(){
          this.data.each(function(rec) {
              rec.join(null);
          });
          this.data.clear();
      },
  
      /**
       * <p>Loads the Record cache from the configured <tt>{@link #proxy}</tt> using the configured <tt>{@link #reader}</tt>.</p>
       * <br><p>Notes:</p><div class="mdetail-params"><ul>
       * <li><b><u>Important</u></b>: loading is asynchronous! This call will return before the new data has been
       * loaded. To perform any post-processing where information from the load call is required, specify
       * the <tt>callback</tt> function to be called, or use a {@link Ext.util.Observable#listeners a 'load' event handler}.</li>
       * <li>If using {@link Ext.PagingToolbar remote paging}, the first load call must specify the <tt>start</tt> and <tt>limit</tt>
       * properties in the <code>options.params</code> property to establish the initial position within the
       * dataset, and the number of Records to cache on each read from the Proxy.</li>
       * <li>If using {@link #remoteSort remote sorting}, the configured <code>{@link #sortInfo}</code>
       * will be automatically included with the posted parameters according to the specified
       * <code>{@link #paramNames}</code>.</li>
       * </ul></div>
       * @param {Object} options An object containing properties which control loading options:<ul>
       * <li><b><tt>params</tt></b> :Object<div class="sub-desc"><p>An object containing properties to pass as HTTP
       * parameters to a remote data source. <b>Note</b>: <code>params</code> will override any
       * <code>{@link #baseParams}</code> of the same name.</p>
       * <p>Parameters are encoded as standard HTTP parameters using {@link Ext#urlEncode}.</p></div></li>
       * <li><b>callback</b> : Function<div class="sub-desc"><p>A function to be called after the Records
       * have been loaded. The callback is called after the load event is fired, and is passed the following arguments:<ul>
       * <li>r : Ext.data.Record[] An Array of Records loaded.</li>
       * <li>options : Options object from the load call.</li>
       * <li>success : Boolean success indicator.</li></ul></p></div></li>
       * <li><b>scope</b> : Object<div class="sub-desc"><p>Scope with which to call the callback (defaults
       * to the Store object)</p></div></li>
       * <li><b>add</b> : Boolean<div class="sub-desc"><p>Indicator to append loaded records rather than
       * replace the current cache.  <b>Note</b>: see note for <tt>{@link #loadData}</tt></p></div></li>
       * </ul>
       * @return {Boolean} If the <i>developer</i> provided <tt>{@link #beforeload}</tt> event handler returns
       * <tt>false</tt>, the load call will abort and will return <tt>false</tt>; otherwise will return <tt>true</tt>.
       */
      load : function(options) {
          options = Ext.apply({}, options);
          this.storeOptions(options);
          if(this.sortInfo && this.remoteSort){
              var pn = this.paramNames;
              options.params = Ext.apply({}, options.params);
              options.params[pn.sort] = this.sortInfo.field;
              options.params[pn.dir] = this.sortInfo.direction;
          }
          try {
              return this.execute('read', null, options); // <-- null represents rs.  No rs for load actions.
          } catch(e) {
              this.handleException(e);
              return false;
          }
      },
  
      /**
       * updateRecord  Should not be used directly.  This method will be called automatically if a Writer is set.
       * Listens to 'update' event.
       * @param {Object} store
       * @param {Object} record
       * @param {Object} action
       * @private
       */
      updateRecord : function(store, record, action) {
          if (action == Ext.data.Record.EDIT && this.autoSave === true && (!record.phantom || (record.phantom && record.isValid()))) {
              this.save();
          }
      },
  
      /**
       * @private
       * Should not be used directly.  Store#add will call this automatically if a Writer is set
       * @param {Object} store
       * @param {Object} records
       * @param {Object} index
       */
      createRecords : function(store, records, index) {
          var modified = this.modified,
              length   = records.length,
              record, i;
          
          for (i = 0; i < length; i++) {
              record = records[i];
              
              if (record.phantom && record.isValid()) {
                  record.markDirty();  // <-- Mark new records dirty (Ed: why?)
                  
                  if (modified.indexOf(record) == -1) {
                      modified.push(record);
                  }
              }
          }
          if (this.autoSave === true) {
              this.save();
          }
      },
  
      /**
       * Destroys a Record.  Should not be used directly.  It's called by Store#remove if a Writer is set.
       * @param {Store} store this
       * @param {Ext.data.Record} record
       * @param {Number} index
       * @private
       */
      destroyRecord : function(store, record, index) {
          if (this.modified.indexOf(record) != -1) {  // <-- handled already if @cfg pruneModifiedRecords == true
              this.modified.remove(record);
          }
          if (!record.phantom) {
              this.removed.push(record);
  
              // since the record has already been removed from the store but the server request has not yet been executed,
              // must keep track of the last known index this record existed.  If a server error occurs, the record can be
              // put back into the store.  @see Store#createCallback where the record is returned when response status === false
              record.lastIndex = index;
  
              if (this.autoSave === true) {
                  this.save();
              }
          }
      },
  
      /**
       * This method should generally not be used directly.  This method is called internally
       * by {@link #load}, or if a Writer is set will be called automatically when {@link #add},
       * {@link #remove}, or {@link #update} events fire.
       * @param {String} action Action name ('read', 'create', 'update', or 'destroy')
       * @param {Record/Record[]} rs
       * @param {Object} options
       * @throws Error
       * @private
       */
      execute : function(action, rs, options, /* private */ batch) {
          // blow up if action not Ext.data.CREATE, READ, UPDATE, DESTROY
          if (!Ext.data.Api.isAction(action)) {
              throw new Ext.data.Api.Error('execute', action);
          }
          // make sure options has a fresh, new params hash
          options = Ext.applyIf(options||{}, {
              params: {}
          });
          if(batch !== undefined){
              this.addToBatch(batch);
          }
          // have to separate before-events since load has a different signature than create,destroy and save events since load does not
          // include the rs (record resultset) parameter.  Capture return values from the beforeaction into doRequest flag.
          var doRequest = true;
  
          if (action === 'read') {
              doRequest = this.fireEvent('beforeload', this, options);
              Ext.applyIf(options.params, this.baseParams);
          }
          else {
              // if Writer is configured as listful, force single-record rs to be [{}] instead of {}
              // TODO Move listful rendering into DataWriter where the @cfg is defined.  Should be easy now.
              if (this.writer.listful === true && this.restful !== true) {
                  rs = (Ext.isArray(rs)) ? rs : [rs];
              }
              // if rs has just a single record, shift it off so that Writer writes data as '{}' rather than '[{}]'
              else if (Ext.isArray(rs) && rs.length == 1) {
                  rs = rs.shift();
              }
              // Write the action to options.params
              if ((doRequest = this.fireEvent('beforewrite', this, action, rs, options)) !== false) {
                  this.writer.apply(options.params, this.baseParams, action, rs);
              }
          }
          if (doRequest !== false) {
              // Send request to proxy.
              if (this.writer && this.proxy.url && !this.proxy.restful && !Ext.data.Api.hasUniqueUrl(this.proxy, action)) {
                  options.params.xaction = action;    // <-- really old, probaby unecessary.
              }
              // Note:  Up until this point we've been dealing with 'action' as a key from Ext.data.Api.actions.
              // We'll flip it now and send the value into DataProxy#request, since it's the value which maps to
              // the user's configured DataProxy#api
              // TODO Refactor all Proxies to accept an instance of Ext.data.Request (not yet defined) instead of this looooooong list
              // of params.  This method is an artifact from Ext2.
              this.proxy.request(Ext.data.Api.actions[action], rs, options.params, this.reader, this.createCallback(action, rs, batch), this, options);
          }
          return doRequest;
      },
  
      /**
       * Saves all pending changes to the store.  If the commensurate Ext.data.Api.actions action is not configured, then
       * the configured <code>{@link #url}</code> will be used.
       * <pre>
       * change            url
       * ---------------   --------------------
       * removed records   Ext.data.Api.actions.destroy
       * phantom records   Ext.data.Api.actions.create
       * {@link #getModifiedRecords modified records}  Ext.data.Api.actions.update
       * </pre>
       * @TODO:  Create extensions of Error class and send associated Record with thrown exceptions.
       * e.g.:  Ext.data.DataReader.Error or Ext.data.Error or Ext.data.DataProxy.Error, etc.
       * @return {Number} batch Returns a number to uniquely identify the "batch" of saves occurring. -1 will be returned
       * if there are no items to save or the save was cancelled.
       */
      save : function() {
          if (!this.writer) {
              throw new Ext.data.Store.Error('writer-undefined');
          }
  
          var queue = [],
              len,
              trans,
              batch,
              data = {},
              i;
          // DESTROY:  First check for removed records.  Records in this.removed are guaranteed non-phantoms.  @see Store#remove
          if(this.removed.length){
              queue.push(['destroy', this.removed]);
          }
  
          // Check for modified records. Use a copy so Store#rejectChanges will work if server returns error.
          var rs = [].concat(this.getModifiedRecords());
          if(rs.length){
              // CREATE:  Next check for phantoms within rs.  splice-off and execute create.
              var phantoms = [];
              for(i = rs.length-1; i >= 0; i--){
                  if(rs[i].phantom === true){
                      var rec = rs.splice(i, 1).shift();
                      if(rec.isValid()){
                          phantoms.push(rec);
                      }
                  }else if(!rs[i].isValid()){ // <-- while we're here, splice-off any !isValid real records
                      rs.splice(i,1);
                  }
              }
              // If we have valid phantoms, create them...
              if(phantoms.length){
                  queue.push(['create', phantoms]);
              }
  
              // UPDATE:  And finally, if we're still here after splicing-off phantoms and !isValid real records, update the rest...
              if(rs.length){
                  queue.push(['update', rs]);
              }
          }
          len = queue.length;
          if(len){
              batch = ++this.batchCounter;
              for(i = 0; i < len; ++i){
                  trans = queue[i];
                  data[trans[0]] = trans[1];
              }
              if(this.fireEvent('beforesave', this, data) !== false){
                  for(i = 0; i < len; ++i){
                      trans = queue[i];
                      this.doTransaction(trans[0], trans[1], batch);
                  }
                  return batch;
              }
          }
          return -1;
      },
  
      // private.  Simply wraps call to Store#execute in try/catch.  Defers to Store#handleException on error.  Loops if batch: false
      doTransaction : function(action, rs, batch) {
          function transaction(records) {
              try{
                  this.execute(action, records, undefined, batch);
              }catch (e){
                  this.handleException(e);
              }
          }
          if(this.batch === false){
              for(var i = 0, len = rs.length; i < len; i++){
                  transaction.call(this, rs[i]);
              }
          }else{
              transaction.call(this, rs);
          }
      },
  
      // private
      addToBatch : function(batch){
          var b = this.batches,
              key = this.batchKey + batch,
              o = b[key];
  
          if(!o){
              b[key] = o = {
                  id: batch,
                  count: 0,
                  data: {}
              };
          }
          ++o.count;
      },
  
      removeFromBatch : function(batch, action, data){
          var b = this.batches,
              key = this.batchKey + batch,
              o = b[key],
              arr;
  
  
          if(o){
              arr = o.data[action] || [];
              o.data[action] = arr.concat(data);
              if(o.count === 1){
                  data = o.data;
                  delete b[key];
                  this.fireEvent('save', this, batch, data);
              }else{
                  --o.count;
              }
          }
      },
  
      // @private callback-handler for remote CRUD actions
      // Do not override -- override loadRecords, onCreateRecords, onDestroyRecords and onUpdateRecords instead.
      createCallback : function(action, rs, batch) {
          var actions = Ext.data.Api.actions;
          return (action == 'read') ? this.loadRecords : function(data, response, success) {
              // calls: onCreateRecords | onUpdateRecords | onDestroyRecords
              this['on' + Ext.util.Format.capitalize(action) + 'Records'](success, rs, [].concat(data));
              // If success === false here, exception will have been called in DataProxy
              if (success === true) {
                  this.fireEvent('write', this, action, data, response, rs);
              }
              this.removeFromBatch(batch, action, data);
          };
      },
  
      // Clears records from modified array after an exception event.
      // NOTE:  records are left marked dirty.  Do we want to commit them even though they were not updated/realized?
      // TODO remove this method?
      clearModified : function(rs) {
          if (Ext.isArray(rs)) {
              for (var n=rs.length-1;n>=0;n--) {
                  this.modified.splice(this.modified.indexOf(rs[n]), 1);
              }
          } else {
              this.modified.splice(this.modified.indexOf(rs), 1);
          }
      },
  
      // remap record ids in MixedCollection after records have been realized.  @see Store#onCreateRecords, @see DataReader#realize
      reMap : function(record) {
          if (Ext.isArray(record)) {
              for (var i = 0, len = record.length; i < len; i++) {
                  this.reMap(record[i]);
              }
          } else {
              delete this.data.map[record._phid];
              this.data.map[record.id] = record;
              var index = this.data.keys.indexOf(record._phid);
              this.data.keys.splice(index, 1, record.id);
              delete record._phid;
          }
      },
  
      // @protected onCreateRecord proxy callback for create action
      onCreateRecords : function(success, rs, data) {
          if (success === true) {
              try {
                  this.reader.realize(rs, data);
              }
              catch (e) {
                  this.handleException(e);
                  if (Ext.isArray(rs)) {
                      // Recurse to run back into the try {}.  DataReader#realize splices-off the rs until empty.
                      this.onCreateRecords(success, rs, data);
                  }
              }
          }
      },
  
      // @protected, onUpdateRecords proxy callback for update action
      onUpdateRecords : function(success, rs, data) {
          if (success === true) {
              try {
                  this.reader.update(rs, data);
              } catch (e) {
                  this.handleException(e);
                  if (Ext.isArray(rs)) {
                      // Recurse to run back into the try {}.  DataReader#update splices-off the rs until empty.
                      this.onUpdateRecords(success, rs, data);
                  }
              }
          }
      },
  
      // @protected onDestroyRecords proxy callback for destroy action
      onDestroyRecords : function(success, rs, data) {
          // splice each rec out of this.removed
          rs = (rs instanceof Ext.data.Record) ? [rs] : [].concat(rs);
          for (var i=0,len=rs.length;i<len;i++) {
              this.removed.splice(this.removed.indexOf(rs[i]), 1);
          }
          if (success === false) {
              // put records back into store if remote destroy fails.
              // @TODO: Might want to let developer decide.
              for (i=rs.length-1;i>=0;i--) {
                  this.insert(rs[i].lastIndex, rs[i]);    // <-- lastIndex set in Store#destroyRecord
              }
          }
      },
  
      // protected handleException.  Possibly temporary until Ext framework has an exception-handler.
      handleException : function(e) {
          // @see core/Error.js
          Ext.handleError(e);
      },
  
      /**
       * <p>Reloads the Record cache from the configured Proxy using the configured
       * {@link Ext.data.Reader Reader} and the options from the last load operation
       * performed.</p>
       * <p><b>Note</b>: see the Important note in {@link #load}.</p>
       * @param {Object} options <p>(optional) An <tt>Object</tt> containing
       * {@link #load loading options} which may override the {@link #lastOptions options}
       * used in the last {@link #load} operation. See {@link #load} for details
       * (defaults to <tt>null</tt>, in which case the {@link #lastOptions} are
       * used).</p>
       * <br><p>To add new params to the existing params:</p><pre><code>
  lastOptions = myStore.lastOptions;
  Ext.apply(lastOptions.params, {
      myNewParam: true
  });
  myStore.reload(lastOptions);
       * </code></pre>
       */
      reload : function(options){
          this.load(Ext.applyIf(options||{}, this.lastOptions));
      },
  
      // private
      // Called as a callback by the Reader during a load operation.
      loadRecords : function(o, options, success){
          var i, len;
          
          if (this.isDestroyed === true) {
              return;
          }
          if(!o || success === false){
              if(success !== false){
                  this.fireEvent('load', this, [], options);
              }
              if(options.callback){
                  options.callback.call(options.scope || this, [], options, false, o);
              }
              return;
          }
          var r = o.records, t = o.totalRecords || r.length;
          if(!options || options.add !== true){
              if(this.pruneModifiedRecords){
                  this.modified = [];
              }
              for(i = 0, len = r.length; i < len; i++){
                  r[i].join(this);
              }
              if(this.snapshot){
                  this.data = this.snapshot;
                  delete this.snapshot;
              }
              this.clearData();
              this.data.addAll(r);
              this.totalLength = t;
              this.applySort();
              this.fireEvent('datachanged', this);
          }else{
              var toAdd = [],
                  rec,
                  cnt = 0;
              for(i = 0, len = r.length; i < len; ++i){
                  rec = r[i];
                  if(this.indexOfId(rec.id) > -1){
                      this.doUpdate(rec);
                  }else{
                      toAdd.push(rec);
                      ++cnt;
                  }
              }
              this.totalLength = Math.max(t, this.data.length + cnt);
              this.add(toAdd);
          }
          this.fireEvent('load', this, r, options);
          if(options.callback){
              options.callback.call(options.scope || this, r, options, true);
          }
      },
  
      /**
       * Loads data from a passed data block and fires the {@link #load} event. A {@link Ext.data.Reader Reader}
       * which understands the format of the data must have been configured in the constructor.
       * @param {Object} data The data block from which to read the Records.  The format of the data expected
       * is dependent on the type of {@link Ext.data.Reader Reader} that is configured and should correspond to
       * that {@link Ext.data.Reader Reader}'s <tt>{@link Ext.data.Reader#readRecords}</tt> parameter.
       * @param {Boolean} append (Optional) <tt>true</tt> to append the new Records rather the default to replace
       * the existing cache.
       * <b>Note</b>: that Records in a Store are keyed by their {@link Ext.data.Record#id id}, so added Records
       * with ids which are already present in the Store will <i>replace</i> existing Records. Only Records with
       * new, unique ids will be added.
       */
      loadData : function(o, append){
          var r = this.reader.readRecords(o);
          this.loadRecords(r, {add: append}, true);
      },
  
      /**
       * Gets the number of cached records.
       * <p>If using paging, this may not be the total size of the dataset. If the data object
       * used by the Reader contains the dataset size, then the {@link #getTotalCount} function returns
       * the dataset size.  <b>Note</b>: see the Important note in {@link #load}.</p>
       * @return {Number} The number of Records in the Store's cache.
       */
      getCount : function(){
          return this.data.length || 0;
      },
  
      /**
       * Gets the total number of records in the dataset as returned by the server.
       * <p>If using paging, for this to be accurate, the data object used by the {@link #reader Reader}
       * must contain the dataset size. For remote data sources, the value for this property
       * (<tt>totalProperty</tt> for {@link Ext.data.JsonReader JsonReader},
       * <tt>totalRecords</tt> for {@link Ext.data.XmlReader XmlReader}) shall be returned by a query on the server.
       * <b>Note</b>: see the Important note in {@link #load}.</p>
       * @return {Number} The number of Records as specified in the data object passed to the Reader
       * by the Proxy.
       * <p><b>Note</b>: this value is not updated when changing the contents of the Store locally.</p>
       */
      getTotalCount : function(){
          return this.totalLength || 0;
      },
  
      /**
       * Returns an object describing the current sort state of this Store.
       * @return {Object} The sort state of the Store. An object with two properties:<ul>
       * <li><b>field : String<p class="sub-desc">The name of the field by which the Records are sorted.</p></li>
       * <li><b>direction : String<p class="sub-desc">The sort order, 'ASC' or 'DESC' (case-sensitive).</p></li>
       * </ul>
       * See <tt>{@link #sortInfo}</tt> for additional details.
       */
      getSortState : function(){
          return this.sortInfo;
      },
  
      /**
       * @private
       * Invokes sortData if we have sortInfo to sort on and are not sorting remotely
       */
      applySort : function(){
          if ((this.sortInfo || this.multiSortInfo) && !this.remoteSort) {
              this.sortData();
          }
      },
  
      /**
       * @private
       * Performs the actual sorting of data. This checks to see if we currently have a multi sort or not. It applies
       * each sorter field/direction pair in turn by building an OR'ed master sorting function and running it against
       * the full dataset
       */
      sortData : function() {
          var sortInfo  = this.hasMultiSort ? this.multiSortInfo : this.sortInfo,
              direction = sortInfo.direction || "ASC",
              sorters   = sortInfo.sorters,
              sortFns   = [];
  
          //if we just have a single sorter, pretend it's the first in an array
          if (!this.hasMultiSort) {
              sorters = [{direction: direction, field: sortInfo.field}];
          }
  
          //create a sorter function for each sorter field/direction combo
          for (var i=0, j = sorters.length; i < j; i++) {
              sortFns.push(this.createSortFunction(sorters[i].field, sorters[i].direction));
          }
          
          if (sortFns.length == 0) {
              return;
          }
  
          //the direction modifier is multiplied with the result of the sorting functions to provide overall sort direction
          //(as opposed to direction per field)
          var directionModifier = direction.toUpperCase() == "DESC" ? -1 : 1;
  
          //create a function which ORs each sorter together to enable multi-sort
          var fn = function(r1, r2) {
            var result = sortFns[0].call(this, r1, r2);
  
            //if we have more than one sorter, OR any additional sorter functions together
            if (sortFns.length > 1) {
                for (var i=1, j = sortFns.length; i < j; i++) {
                    result = result || sortFns[i].call(this, r1, r2);
                }
            }
  
            return directionModifier * result;
          };
  
          //sort the data
          this.data.sort(direction, fn);
          if (this.snapshot && this.snapshot != this.data) {
              this.snapshot.sort(direction, fn);
          }
      },
  
      /**
       * @private
       * Creates and returns a function which sorts an array by the given field and direction
       * @param {String} field The field to create the sorter for
       * @param {String} direction The direction to sort by (defaults to "ASC")
       * @return {Function} A function which sorts by the field/direction combination provided
       */
      createSortFunction: function(field, direction) {
          direction = direction || "ASC";
          var directionModifier = direction.toUpperCase() == "DESC" ? -1 : 1;
  
          var sortType = this.fields.get(field).sortType;
  
          //create a comparison function. Takes 2 records, returns 1 if record 1 is greater,
          //-1 if record 2 is greater or 0 if they are equal
          return function(r1, r2) {
              var v1 = sortType(r1.data[field]),
                  v2 = sortType(r2.data[field]);
  
              return directionModifier * (v1 > v2 ? 1 : (v1 < v2 ? -1 : 0));
          };
      },
  
      /**
       * Sets the default sort column and order to be used by the next {@link #load} operation.
       * @param {String} fieldName The name of the field to sort by.
       * @param {String} dir (optional) The sort order, 'ASC' or 'DESC' (case-sensitive, defaults to <tt>'ASC'</tt>)
       */
      setDefaultSort : function(field, dir) {
          dir = dir ? dir.toUpperCase() : 'ASC';
          this.sortInfo = {field: field, direction: dir};
          this.sortToggle[field] = dir;
      },
  
      /**
       * Sort the Records.
       * If remote sorting is used, the sort is performed on the server, and the cache is reloaded. If local
       * sorting is used, the cache is sorted internally. See also {@link #remoteSort} and {@link #paramNames}.
       * This function accepts two call signatures - pass in a field name as the first argument to sort on a single
       * field, or pass in an array of sort configuration objects to sort by multiple fields.
       * Single sort example:
       * store.sort('name', 'ASC');
       * Multi sort example:
       * store.sort([
       *   {
       *     field    : 'name',
       *     direction: 'ASC'
       *   },
       *   {
       *     field    : 'salary',
       *     direction: 'DESC'
       *   }
       * ], 'ASC');
       * In this second form, the sort configs are applied in order, with later sorters sorting within earlier sorters' results.
       * For example, if two records with the same name are present they will also be sorted by salary if given the sort configs
       * above. Any number of sort configs can be added.
       * @param {String/Array} fieldName The name of the field to sort by, or an array of ordered sort configs
       * @param {String} dir (optional) The sort order, 'ASC' or 'DESC' (case-sensitive, defaults to <tt>'ASC'</tt>)
       */
      sort : function(fieldName, dir) {
          if (Ext.isArray(arguments[0])) {
              return this.multiSort.call(this, fieldName, dir);
          } else {
              return this.singleSort(fieldName, dir);
          }
      },
  
      /**
       * Sorts the store contents by a single field and direction. This is called internally by {@link sort} and would
       * not usually be called manually
       * @param {String} fieldName The name of the field to sort by.
       * @param {String} dir (optional) The sort order, 'ASC' or 'DESC' (case-sensitive, defaults to <tt>'ASC'</tt>)
       */
      singleSort: function(fieldName, dir) {
          var field = this.fields.get(fieldName);
          if (!field) {
              return false;
          }
  
          var name       = field.name,
              sortInfo   = this.sortInfo || null,
              sortToggle = this.sortToggle ? this.sortToggle[name] : null;
  
          if (!dir) {
              if (sortInfo && sortInfo.field == name) { // toggle sort dir
                  dir = (this.sortToggle[name] || 'ASC').toggle('ASC', 'DESC');
              } else {
                  dir = field.sortDir;
              }
          }
  
          this.sortToggle[name] = dir;
          this.sortInfo = {field: name, direction: dir};
          this.hasMultiSort = false;
  
          if (this.remoteSort) {
              if (!this.load(this.lastOptions)) {
                  if (sortToggle) {
                      this.sortToggle[name] = sortToggle;
                  }
                  if (sortInfo) {
                      this.sortInfo = sortInfo;
                  }
              }
          } else {
              this.applySort();
              this.fireEvent('datachanged', this);
          }
          return true;
      },
  
      /**
       * Sorts the contents of this store by multiple field/direction sorters. This is called internally by {@link sort}
       * and would not usually be called manually.
       * Multi sorting only currently applies to local datasets - multiple sort data is not currently sent to a proxy
       * if remoteSort is used.
       * @param {Array} sorters Array of sorter objects (field and direction)
       * @param {String} direction Overall direction to sort the ordered results by (defaults to "ASC")
       */
      multiSort: function(sorters, direction) {
          this.hasMultiSort = true;
          direction = direction || "ASC";
  
          //toggle sort direction
          if (this.multiSortInfo && direction == this.multiSortInfo.direction) {
              direction = direction.toggle("ASC", "DESC");
          }
  
          /**
           * Object containing overall sort direction and an ordered array of sorter configs used when sorting on multiple fields
           * @property multiSortInfo
           * @type Object
           */
          this.multiSortInfo = {
              sorters  : sorters,
              direction: direction
          };
          
          if (this.remoteSort) {
              this.singleSort(sorters[0].field, sorters[0].direction);
  
          } else {
              this.applySort();
              this.fireEvent('datachanged', this);
          }
      },
  
      /**
       * Calls the specified function for each of the {@link Ext.data.Record Records} in the cache.
       * @param {Function} fn The function to call. The {@link Ext.data.Record Record} is passed as the first parameter.
       * Returning <tt>false</tt> aborts and exits the iteration.
       * @param {Object} scope (optional) The scope (<code>this</code> reference) in which the function is executed.
       * Defaults to the current {@link Ext.data.Record Record} in the iteration.
       */
      each : function(fn, scope){
          this.data.each(fn, scope);
      },
  
      /**
       * Gets all {@link Ext.data.Record records} modified since the last commit.  Modified records are
       * persisted across load operations (e.g., during paging). <b>Note</b>: deleted records are not
       * included.  See also <tt>{@link #pruneModifiedRecords}</tt> and
       * {@link Ext.data.Record}<tt>{@link Ext.data.Record#markDirty markDirty}.</tt>.
       * @return {Ext.data.Record[]} An array of {@link Ext.data.Record Records} containing outstanding
       * modifications.  To obtain modified fields within a modified record see
       *{@link Ext.data.Record}<tt>{@link Ext.data.Record#modified modified}.</tt>.
       */
      getModifiedRecords : function(){
          return this.modified;
      },
  
      /**
       * Sums the value of <tt>property</tt> for each {@link Ext.data.Record record} between <tt>start</tt>
       * and <tt>end</tt> and returns the result.
       * @param {String} property A field in each record
       * @param {Number} start (optional) The record index to start at (defaults to <tt>0</tt>)
       * @param {Number} end (optional) The last record index to include (defaults to length - 1)
       * @return {Number} The sum
       */
      sum : function(property, start, end){
          var rs = this.data.items, v = 0;
          start = start || 0;
          end = (end || end === 0) ? end : rs.length-1;
  
          for(var i = start; i <= end; i++){
              v += (rs[i].data[property] || 0);
          }
          return v;
      },
  
      /**
       * @private
       * Returns a filter function used to test a the given property's value. Defers most of the work to
       * Ext.util.MixedCollection's createValueMatcher function
       * @param {String} property The property to create the filter function for
       * @param {String/RegExp} value The string/regex to compare the property value to
       * @param {Boolean} anyMatch True if we don't care if the filter value is not the full value (defaults to false)
       * @param {Boolean} caseSensitive True to create a case-sensitive regex (defaults to false)
       * @param {Boolean} exactMatch True to force exact match (^ and $ characters added to the regex). Defaults to false. Ignored if anyMatch is true.
       */
      createFilterFn : function(property, value, anyMatch, caseSensitive, exactMatch){
          if(Ext.isEmpty(value, false)){
              return false;
          }
          value = this.data.createValueMatcher(value, anyMatch, caseSensitive, exactMatch);
          return function(r) {
              return value.test(r.data[property]);
          };
      },
  
      /**
       * @private
       * Given an array of filter functions (each with optional scope), constructs and returns a single function that returns
       * the result of all of the filters ANDed together
       * @param {Array} filters The array of filter objects (each object should contain an 'fn' and optional scope)
       * @return {Function} The multiple filter function
       */
      createMultipleFilterFn: function(filters) {
          return function(record) {
              var isMatch = true;
  
              for (var i=0, j = filters.length; i < j; i++) {
                  var filter = filters[i],
                      fn     = filter.fn,
                      scope  = filter.scope;
  
                  isMatch = isMatch && fn.call(scope, record);
              }
  
              return isMatch;
          };
      },
  
      /**
       * Filter the {@link Ext.data.Record records} by a specified property. Alternatively, pass an array of filter
       * options to filter by more than one property.
       * Single filter example:
       * store.filter('name', 'Ed', true, true); //finds all records containing the substring 'Ed'
       * Multiple filter example:
       * <pre><code>
       * store.filter([
       *   {
       *     property     : 'name',
       *     value        : 'Ed',
       *     anyMatch     : true, //optional, defaults to true
       *     caseSensitive: true  //optional, defaults to true
       *   },
       *
       *   //filter functions can also be passed
       *   {
       *     fn   : function(record) {
       *       return record.get('age') == 24
       *     },
       *     scope: this
       *   }
       * ]);
       * </code></pre>
       * @param {String|Array} field A field on your records, or an array containing multiple filter options
       * @param {String/RegExp} value Either a string that the field should begin with, or a RegExp to test
       * against the field.
       * @param {Boolean} anyMatch (optional) <tt>true</tt> to match any part not just the beginning
       * @param {Boolean} caseSensitive (optional) <tt>true</tt> for case sensitive comparison
       * @param {Boolean} exactMatch True to force exact match (^ and $ characters added to the regex). Defaults to false. Ignored if anyMatch is true.
       */
      filter : function(property, value, anyMatch, caseSensitive, exactMatch){
          var fn;
          //we can accept an array of filter objects, or a single filter object - normalize them here
          if (Ext.isObject(property)) {
              property = [property];
          }
  
          if (Ext.isArray(property)) {
              var filters = [];
  
              //normalize the filters passed into an array of filter functions
              for (var i=0, j = property.length; i < j; i++) {
                  var filter = property[i],
                      func   = filter.fn,
                      scope  = filter.scope || this;
  
                  //if we weren't given a filter function, construct one now
                  if (!Ext.isFunction(func)) {
                      func = this.createFilterFn(filter.property, filter.value, filter.anyMatch, filter.caseSensitive, filter.exactMatch);
                  }
  
                  filters.push({fn: func, scope: scope});
              }
  
              fn = this.createMultipleFilterFn(filters);
          } else {
              //classic single property filter
              fn = this.createFilterFn(property, value, anyMatch, caseSensitive, exactMatch);
          }
  
          return fn ? this.filterBy(fn) : this.clearFilter();
      },
  
      /**
       * Filter by a function. The specified function will be called for each
       * Record in this Store. If the function returns <tt>true</tt> the Record is included,
       * otherwise it is filtered out.
       * @param {Function} fn The function to be called. It will be passed the following parameters:<ul>
       * <li><b>record</b> : Ext.data.Record<p class="sub-desc">The {@link Ext.data.Record record}
       * to test for filtering. Access field values using {@link Ext.data.Record#get}.</p></li>
       * <li><b>id</b> : Object<p class="sub-desc">The ID of the Record passed.</p></li>
       * </ul>
       * @param {Object} scope (optional) The scope (<code>this</code> reference) in which the function is executed. Defaults to this Store.
       */
      filterBy : function(fn, scope){
          this.snapshot = this.snapshot || this.data;
          this.data = this.queryBy(fn, scope || this);
          this.fireEvent('datachanged', this);
      },
  
      /**
       * Revert to a view of the Record cache with no filtering applied.
       * @param {Boolean} suppressEvent If <tt>true</tt> the filter is cleared silently without firing the
       * {@link #datachanged} event.
       */
      clearFilter : function(suppressEvent){
          if(this.isFiltered()){
              this.data = this.snapshot;
              delete this.snapshot;
              if(suppressEvent !== true){
                  this.fireEvent('datachanged', this);
              }
          }
      },
  
      /**
       * Returns true if this store is currently filtered
       * @return {Boolean}
       */
      isFiltered : function(){
          return !!this.snapshot && this.snapshot != this.data;
      },
  
      /**
       * Query the records by a specified property.
       * @param {String} field A field on your records
       * @param {String/RegExp} value Either a string that the field
       * should begin with, or a RegExp to test against the field.
       * @param {Boolean} anyMatch (optional) True to match any part not just the beginning
       * @param {Boolean} caseSensitive (optional) True for case sensitive comparison
       * @return {MixedCollection} Returns an Ext.util.MixedCollection of the matched records
       */
      query : function(property, value, anyMatch, caseSensitive){
          var fn = this.createFilterFn(property, value, anyMatch, caseSensitive);
          return fn ? this.queryBy(fn) : this.data.clone();
      },
  
      /**
       * Query the cached records in this Store using a filtering function. The specified function
       * will be called with each record in this Store. If the function returns <tt>true</tt> the record is
       * included in the results.
       * @param {Function} fn The function to be called. It will be passed the following parameters:<ul>
       * <li><b>record</b> : Ext.data.Record<p class="sub-desc">The {@link Ext.data.Record record}
       * to test for filtering. Access field values using {@link Ext.data.Record#get}.</p></li>
       * <li><b>id</b> : Object<p class="sub-desc">The ID of the Record passed.</p></li>
       * </ul>
       * @param {Object} scope (optional) The scope (<code>this</code> reference) in which the function is executed. Defaults to this Store.
       * @return {MixedCollection} Returns an Ext.util.MixedCollection of the matched records
       **/
      queryBy : function(fn, scope){
          var data = this.snapshot || this.data;
          return data.filterBy(fn, scope||this);
      },
  
      /**
       * Finds the index of the first matching Record in this store by a specific field value.
       * @param {String} fieldName The name of the Record field to test.
       * @param {String/RegExp} value Either a string that the field value
       * should begin with, or a RegExp to test against the field.
       * @param {Number} startIndex (optional) The index to start searching at
       * @param {Boolean} anyMatch (optional) True to match any part of the string, not just the beginning
       * @param {Boolean} caseSensitive (optional) True for case sensitive comparison
       * @return {Number} The matched index or -1
       */
      find : function(property, value, start, anyMatch, caseSensitive){
          var fn = this.createFilterFn(property, value, anyMatch, caseSensitive);
          return fn ? this.data.findIndexBy(fn, null, start) : -1;
      },
  
      /**
       * Finds the index of the first matching Record in this store by a specific field value.
       * @param {String} fieldName The name of the Record field to test.
       * @param {Mixed} value The value to match the field against.
       * @param {Number} startIndex (optional) The index to start searching at
       * @return {Number} The matched index or -1
       */
      findExact: function(property, value, start){
          return this.data.findIndexBy(function(rec){
              return rec.get(property) === value;
          }, this, start);
      },
  
      /**
       * Find the index of the first matching Record in this Store by a function.
       * If the function returns <tt>true</tt> it is considered a match.
       * @param {Function} fn The function to be called. It will be passed the following parameters:<ul>
       * <li><b>record</b> : Ext.data.Record<p class="sub-desc">The {@link Ext.data.Record record}
       * to test for filtering. Access field values using {@link Ext.data.Record#get}.</p></li>
       * <li><b>id</b> : Object<p class="sub-desc">The ID of the Record passed.</p></li>
       * </ul>
       * @param {Object} scope (optional) The scope (<code>this</code> reference) in which the function is executed. Defaults to this Store.
       * @param {Number} startIndex (optional) The index to start searching at
       * @return {Number} The matched index or -1
       */
      findBy : function(fn, scope, start){
          return this.data.findIndexBy(fn, scope, start);
      },
  
      /**
       * Collects unique values for a particular dataIndex from this store.
       * @param {String} dataIndex The property to collect
       * @param {Boolean} allowNull (optional) Pass true to allow null, undefined or empty string values
       * @param {Boolean} bypassFilter (optional) Pass true to collect from all records, even ones which are filtered
       * @return {Array} An array of the unique values
       **/
      collect : function(dataIndex, allowNull, bypassFilter){
          var d = (bypassFilter === true && this.snapshot) ?
                  this.snapshot.items : this.data.items;
          var v, sv, r = [], l = {};
          for(var i = 0, len = d.length; i < len; i++){
              v = d[i].data[dataIndex];
              sv = String(v);
              if((allowNull || !Ext.isEmpty(v)) && !l[sv]){
                  l[sv] = true;
                  r[r.length] = v;
              }
          }
          return r;
      },
  
      // private
      afterEdit : function(record){
          if(this.modified.indexOf(record) == -1){
              this.modified.push(record);
          }
          this.fireEvent('update', this, record, Ext.data.Record.EDIT);
      },
  
      // private
      afterReject : function(record){
          this.modified.remove(record);
          this.fireEvent('update', this, record, Ext.data.Record.REJECT);
      },
  
      // private
      afterCommit : function(record){
          this.modified.remove(record);
          this.fireEvent('update', this, record, Ext.data.Record.COMMIT);
      },
  
      /**
       * Commit all Records with {@link #getModifiedRecords outstanding changes}. To handle updates for changes,
       * subscribe to the Store's {@link #update update event}, and perform updating when the third parameter is
       * Ext.data.Record.COMMIT.
       */
      commitChanges : function(){
          var modified = this.modified.slice(0),
              length   = modified.length,
              i;
              
          for (i = 0; i < length; i++){
              modified[i].commit();
          }
          
          this.modified = [];
          this.removed  = [];
      },
  
      /**
       * {@link Ext.data.Record#reject Reject} outstanding changes on all {@link #getModifiedRecords modified records}.
       */
      rejectChanges : function() {
          var modified = this.modified.slice(0),
              removed  = this.removed.slice(0).reverse(),
              mLength  = modified.length,
              rLength  = removed.length,
              i;
          
          for (i = 0; i < mLength; i++) {
              modified[i].reject();
          }
          
          for (i = 0; i < rLength; i++) {
              this.insert(removed[i].lastIndex || 0, removed[i]);
              removed[i].reject();
          }
          
          this.modified = [];
          this.removed  = [];
      },
  
      // private
      onMetaChange : function(meta){
          this.recordType = this.reader.recordType;
          this.fields = this.recordType.prototype.fields;
          delete this.snapshot;
          if(this.reader.meta.sortInfo){
              this.sortInfo = this.reader.meta.sortInfo;
          }else if(this.sortInfo  && !this.fields.get(this.sortInfo.field)){
              delete this.sortInfo;
          }
          if(this.writer){
              this.writer.meta = this.reader.meta;
          }
          this.modified = [];
          this.fireEvent('metachange', this, this.reader.meta);
      },
  
      // private
      findInsertIndex : function(record){
          this.suspendEvents();
          var data = this.data.clone();
          this.data.add(record);
          this.applySort();
          var index = this.data.indexOf(record);
          this.data = data;
          this.resumeEvents();
          return index;
      },
  
      /**
       * Set the value for a property name in this store's {@link #baseParams}.  Usage:</p><pre><code>
  myStore.setBaseParam('foo', {bar:3});
  </code></pre>
       * @param {String} name Name of the property to assign
       * @param {Mixed} value Value to assign the <tt>name</tt>d property
       **/
      setBaseParam : function (name, value){
          this.baseParams = this.baseParams || {};
          this.baseParams[name] = value;
      }
  });
  
  Ext.reg('store', Ext.data.Store);
  
  /**
   * @class Ext.data.Store.Error
   * @extends Ext.Error
   * Store Error extension.
   * @param {String} name
   */
  Ext.data.Store.Error = Ext.extend(Ext.Error, {
      name: 'Ext.data.Store'
  });
  Ext.apply(Ext.data.Store.Error.prototype, {
      lang: {
          'writer-undefined' : 'Attempted to execute a write-action without a DataWriter installed.'
      }
  });
  