// @tag enterprise/** * The AMF Reader is used by an {@link Ext.data.amf.Proxy AMF Proxy} to read * records from a server response that contains binary data in either AMF0 or * AMF3 format. AMF Reader constructs an {@link Ext.data.amf.Packet AMF Packet} * and uses it to decode the binary data into javascript objects, then simply * allows its superclass ({@link Ext.data.reader.Json}) to handle converting the * raw javascript objects into {@link Ext.data.Model} instances. * * For a more detailed tutorial see the * [AMF Guide](../guides/backend_connectors/amf.html). */Ext.define('Ext.data.amf.Reader', { extend: 'Ext.data.reader.Json', alias : 'reader.amf', requires: [ 'Ext.data.amf.Packet' ], /** * @cfg {Number} messageIndex * AMF Packets can contain multiple messages. This config specifies the * 0-based index of the message that contains the record data. */ messageIndex: 0, /** * Reads records from a XMLHttpRequest response object containing a binary * AMF Packet and returns a ResultSet. * @param {Object} response The XMLHttpRequest response object * @return {Ext.data.ResultSet} */ read: function(response) { var me = this, bytes = response.responseBytes, packet, messages, resultSet; if (!bytes) { throw "AMF Reader cannot process the response because it does not contain binary data. Make sure the Proxy's 'binary' config is true."; } packet = new Ext.data.amf.Packet(); packet.decode(bytes); messages = packet.messages; if (messages.length) { resultSet = me.readRecords(messages[me.messageIndex].body); } else { // no messages, return null result set resultSet = me.nullResultSet; if (packet.invalid) { // packet contains invalid data resultSet.success = false; } } return resultSet; }});