X-Git-Url: http://git.ithinksw.org/extjs.git/blobdiff_plain/0494b8d9b9bb03ab6c22b34dae81261e3cd7e3e6..7a654f8d43fdb43d78b63d90528bed6e86b608cc:/src/data/reader/Array.js

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+/**
+ * @author Ed Spencer
+ * @class Ext.data.reader.Array
+ * @extends Ext.data.reader.Json
+ * 
+ * <p>Data reader class to create an Array of {@link Ext.data.Model} 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 <code>mapping</code> property
+ * of the field definition if it exists, or the field's ordinal position in the definition.</p>
+ * 
+ * <p><u>Example code:</u></p>
+ * 
+<pre><code>
+Employee = Ext.define('Employee', {
+    extend: 'Ext.data.Model',
+    fields: [
+        'id',
+        {name: 'name', mapping: 1},         // "mapping" only needed if an "id" field is present which
+        {name: 'occupation', mapping: 2}    // precludes using the ordinal position as the index.        
+    ]
+});
+
+var myReader = new Ext.data.reader.Array({
+    model: 'Employee'
+}, Employee);
+</code></pre>
+ * 
+ * <p>This would consume an Array like this:</p>
+ * 
+<pre><code>
+[ [1, 'Bill', 'Gardener'], [2, 'Ben', 'Horticulturalist'] ]
+</code></pre>
+ * 
+ * @constructor
+ * Create a new ArrayReader
+ * @param {Object} meta Metadata configuration options.
+ */
+Ext.define('Ext.data.reader.Array', {
+    extend: 'Ext.data.reader.Json',
+    alternateClassName: 'Ext.data.ArrayReader',
+    alias : 'reader.array',
+
+    /**
+     * @private
+     * Most of the work is done for us by JsonReader, but we need to overwrite the field accessors to just
+     * reference the correct position in the array.
+     */
+    buildExtractors: function() {
+        this.callParent(arguments);
+        
+        var fields = this.model.prototype.fields.items,
+            length = fields.length,
+            extractorFunctions = [],
+            i;
+        
+        for (i = 0; i < length; i++) {
+            extractorFunctions.push(function(index) {
+                return function(data) {
+                    return data[index];
+                };
+            }(fields[i].mapping || i));
+        }
+        
+        this.extractorFunctions = extractorFunctions;
+    }
+});