/*
 * Ext JS Library 2.0 Copyright(c) 2006-2007, Ext JS, LLC. licensing@extjs.com
 * 
 * http://extjs.com/license
 */

/**
 * @class Ext.data.ArrayReader
 * @extends Ext.data.DataReader Data reader class to create an Array of
 *          Ext.data.Record objects from an Array. Each element of that Array
 *          represents a row of data fields. The fields are pulled into a Record
 *          object using as a subscript, the <em>mapping</em> property of the
 *          field definition if it exists, or the field's ordinal position in
 *          the definition.<br>
 *          <p>
 *          Example code:.
 * 
 * <pre><code>
 * var Employee = Ext.data.Record.create([{
 * 			name : 'name',
 * 			mapping : 1
 * 		}, // &quot;mapping&quot; only needed if an &quot;id&quot; field is present which
 * 		{
 * 			name : 'occupation',
 * 			mapping : 2
 * 		} // precludes using the ordinal position as the index.
 * ]);
 * var myReader = new Ext.data.ArrayReader({
 * 	id : 0
 * 		// The subscript within row Array that provides an ID for the Record (optional)
 * 	}, Employee);
 * </code></pre>
 * 
 * <p>
 *          This would consume an Array like this:
 * 
 * <pre><code>
 * [[1, 'Bill', 'Gardener'], [2, 'Ben', 'Horticulturalist']]
 * </code></pre>
 * 
 * @cfg {String} id (optional) The subscript within row Array that provides an
 *      ID for the Record
 * @constructor Create a new ArrayReader
 * @param {Object}
 *            meta Metadata configuration options.
 * @param {Object}
 *            recordType Either an Array of field definition objects as
 *            specified to {@link Ext.data.Record#create}, or a
 *            {@link Ext.data.Record Record} constructor created using
 *            {@link Ext.data.Record#create}.
 */
Ext.data.ArrayReader = Ext.extend(Ext.data.JsonReader, {
			/**
			 * Create a data block containing Ext.data.Records from an XML
			 * document.
			 * 
			 * @param {Object}
			 *            o An Array of row objects which represents the
			 *            dataset.
			 * @return {Object} data A data block which is used by an
			 *         Ext.data.Store object as a cache of Ext.data.Records.
			 */
			readRecords : function(o) {
				var sid = this.meta ? this.meta.id : null;
				var recordType = this.recordType, fields = recordType.prototype.fields;
				var records = [];
				var root = o;
				for (var i = 0; i < root.length; i++) {
					var n = root[i];
					var values = {};
					var id = ((sid || sid === 0) && n[sid] !== undefined
							&& n[sid] !== "" ? n[sid] : null);
					for (var j = 0, jlen = fields.length; j < jlen; j++) {
						var f = fields.items[j];
						var k = f.mapping !== undefined && f.mapping !== null
								? f.mapping
								: j;
						var v = n[k] !== undefined ? n[k] : f.defaultValue;
						v = f.convert(v);
						values[f.name] = v;
					}
					var record = new recordType(values, id);
					record.json = n;
					records[records.length] = record;
				}
				return {
					records : records,
					totalRecords : records.length
				};
			}
		});