text: // Copyright 2010 Sean Cribbs, Sonian Inc., and Basho Technologies, Inc.
  //
  //    Licensed under the Apache License, Version 2.0 (the "License");
  //    you may not use this file except in compliance with the License.
  //    You may obtain a copy of the License at
  //
  //        http://www.apache.org/licenses/LICENSE-2.0
  //
  //    Unless required by applicable law or agreed to in writing, software
  //    distributed under the License is distributed on an "AS IS" BASIS,
  //    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  //    See the License for the specific language governing permissions and
  //    limitations under the License.
  
  /*
   * Namespace for Ripple's built-in MapReduce functions.
   */
  var Ripple = {
      /*
       * Filter input values by simple equality test on passed "fields"
       * argument. Returns bucket/key pairs for use in later map phases.
       *
       * Raw Phase Example:
       *  {"map":{
       *          "language":"javascript",
       *          "name":"Ripple.filterByFields",
       *          "arg":{"manufactured":true, "name":"widget"}
       *          }}
       *
       * Ruby invocation example:
       *   mr.map("Ripple.filterByFields",
       *          :arg => {:manufactured => true, :name => "widget"})
       *
       */
      filterByFields: function(value, keyData, fields){
          var object = Riak.mapValuesJson(value)[0];
          for(field in fields){
              if(object[field] != fields[field])
                  return [];
          }
          return [[value.bucket, value.key]];
      },
      /*
       * Filter input values by various conditions passed as the
       * "conditions" argument. Returns bucket/key pairs for use in
       * later map phases.
       *
       * Valid operators:
       *   ==, eq      (equality)
       *   !=, neq     (inequality)
       *   <, lt       (less than)
       *   =<, <=, lte (less than or equal)
       *   >, gt       (greater than)
       *   >=, =>, gte (greater than or equal)
       *   ~=, match   (regular expression match)
       *   between     (inclusive numeric range)
       *   includes    (String or Array inclusion)
       *
       * Example:
       *   {"map":{
       *           "language":"javascript",
       *           "name":"Ripple.filterByConditions",
       *           "arg":{"tags":{"includes":"riak"}, "title":{"~=":"schema"}}
       *          }}
       *
       * Ruby invocation example:
       *   mr.map("Ripple.filterByConditions",
       *          :arg => {:tags => {:includes => "riak"},
       *                   :title => {"~=" => "schema"}})
       */
      filterByConditions: function(value, keyData, conditions){
          var object = Riak.mapValuesJson(value)[0];
          for(condition in conditions){
              if(!Ripple.conditionMatch(condition, conditions[condition], object))
                  return [];
          }
          return [[value.bucket, value.key]];
      },
      /*
       * Given a specific field and test, returns whether the object
       * matches the condition specified by the test. Used internally by
       * Ripple.filterByConditions map phases.
       */
      conditionMatch: function(field, test, object){
          for(t in test){
              switch(t){
              case "==": case "eq":
                  if(object[field] != test[t])
                      return false;
                  break;
              case "!=": case "neq":
                  if(object[field] == test[t])
                      return false;
                  break;
              case "<":  case "lt":
                  if(object[field] >= test[t])
                      return false;
                  break;
              case "=<": case "<=": case "lte":
                  if(object[field] > test[t])
                      return false;
                  break;
              case ">":  case "gt":
                  if(object[field] <= test[t])
                      return false;
                  break;
              case ">=": case "=>": case "gte":
                  if(object[field] < test[t])
                      return false;
                  break;
              case "~=": case "match":
                  if(new RegExp(object[field],"i").test(test[t]))
                      return false;
                  break;
              case "between": // Inclusive on both ends
                  if(object[field] < test[t][0] || object[field] > test[t][1])
                      return false;
                  break;
              case "includes": // Only works with String, Array
                  if(object[field].indexOf(test[t]) == -1)
                      return false;
                  break;
              default:
                  ejsLog("Invalid condition for field " + field + ": " + t + " " + test[t], "ripple-error.log");
                  break;
              }
          }
          return true;
      },
      /*
       * Returns the mapped object without modification. Useful when
       * preceded by map phases that do filtering or link phases.
       */
      mapIdentity: function(value, kd, arg){
          return [value];
      },
      /*
       * Returns the passed values without modification. Useful as an
       * intermediary before reduce phases that require the entire
       * result set to be present (limits).
       */
      reduceIdentity: function(values, arg){
          return values;
      }
  };
  