/*
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This file is part of Ext JS 4.2
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Copyright (c) 2011-2013 Sencha Inc
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Contact: http://www.sencha.com/contact
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GNU General Public License Usage
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This file may be used under the terms of the GNU General Public License version 3.0 as
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published by the Free Software Foundation and appearing in the file LICENSE included in the
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packaging of this file.
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Please review the following information to ensure the GNU General Public License version 3.0
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requirements will be met: http://www.gnu.org/copyleft/gpl.html.
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If you are unsure which license is appropriate for your use, please contact the sales department
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at http://www.sencha.com/contact.
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Build date: 2013-05-16 14:36:50 (f9be68accb407158ba2b1be2c226a6ce1f649314)
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*/
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/**
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* @author Ed Spencer
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* @class Ext.data.reader.Array
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*
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* <p>Data reader class to create an Array of {@link Ext.data.Model} objects from an Array.
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* Each element of that Array represents a row of data fields. The
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* fields are pulled into a Record object using as a subscript, the <code>mapping</code> property
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* of the field definition if it exists, or the field's ordinal position in the definition.</p>
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*
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* <p><u>Example code:</u></p>
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*
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<pre><code>
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Employee = Ext.define('Employee', {
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extend: 'Ext.data.Model',
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fields: [
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'id',
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{name: 'name', mapping: 1}, // "mapping" only needed if an "id" field is present which
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{name: 'occupation', mapping: 2} // precludes using the ordinal position as the index.
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]
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});
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var myReader = new Ext.data.reader.Array({
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model: 'Employee'
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}, Employee);
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</code></pre>
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*
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* <p>This would consume an Array like this:</p>
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*
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<pre><code>
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[ [1, 'Bill', 'Gardener'], [2, 'Ben', 'Horticulturalist'] ]
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</code></pre>
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*
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* @constructor
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* Create a new ArrayReader
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* @param {Object} meta Metadata configuration options.
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*/
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Ext.define('Ext.data.reader.Array', {
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extend: 'Ext.data.reader.Json',
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alternateClassName: 'Ext.data.ArrayReader',
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alias : 'reader.array',
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// For Array Reader, methods in the base which use these properties must not see the defaults
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totalProperty: undefined,
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successProperty: undefined,
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/**
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* @private
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* Returns an accessor expression for the passed Field from an Array using either the Field's mapping, or
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* its ordinal position in the fields collsction as the index.
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* This is used by buildExtractors to create optimized on extractor function which converts raw data into model instances.
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*/
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createFieldAccessExpression: function(field, fieldVarName, dataName) {
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// In the absence of a mapping property, use the original ordinal position
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// at which the Model inserted the field into its collection.
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var index = (field.mapping == null) ? field.originalIndex : field.mapping,
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result;
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if (typeof index === 'function') {
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result = fieldVarName + '.mapping(' + dataName + ', this)';
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} else {
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if (isNaN(index)) {
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index = '"' + index + '"';
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}
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result = dataName + "[" + index + "]";
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}
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return result;
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}
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});
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