text: /*
      This file is part of web3.js.
  
      web3.js is free software: you can redistribute it and/or modify
      it under the terms of the GNU Lesser General Public License as published by
      the Free Software Foundation, either version 3 of the License, or
      (at your option) any later version.
  
      web3.js is distributed in the hope that it will be useful,
      but WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      GNU Lesser General Public License for more details.
  
      You should have received a copy of the GNU Lesser General Public License
      along with web3.js.  If not, see <http://www.gnu.org/licenses/>.
  */
  /**
   * @file batch.js
   * @author Marek Kotewicz <marek@ethdev.com>
   * @date 2015
   */
  
  "use strict";
  
  var Jsonrpc = require('./jsonrpc');
  var errors = require('web3-core-helpers').errors;
  
  var Batch = function (requestManager) {
      this.requestManager = requestManager;
      this.requests = [];
  };
  
  /**
   * Should be called to add create new request to batch request
   *
   * @method add
   * @param {Object} jsonrpc requet object
   */
  Batch.prototype.add = function (request) {
      this.requests.push(request);
  };
  
  /**
   * Should be called to execute batch request
   *
   * @method execute
   */
  Batch.prototype.execute = function () {
      var requests = this.requests;
      this.requestManager.sendBatch(requests, function (err, results) {
          results = results || [];
          requests.map(function (request, index) {
              return results[index] || {};
          }).forEach(function (result, index) {
              if (requests[index].callback) {
                  if (result && result.error) {
                      return requests[index].callback(errors.ErrorResponse(result));
                  }
  
                  if (!Jsonrpc.isValidResponse(result)) {
                      return requests[index].callback(errors.InvalidResponse(result));
                  }
  
                  try {
                      requests[index].callback(null, requests[index].format ? requests[index].format(result.result) : result.result);
                  } catch (err) {
                      requests[index].callback(err);
                  }
              }
          });
      });
  };
  
  module.exports = Batch;
  
  