Upgrade to ExtJS 4.0.0 - Released 04/26/2011

[extjs.git] / src / data / proxy / Memory.js

diff --git a/src/data/proxy/Memory.js b/src/data/proxy/Memory.js
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+++ b/src/data/proxy/Memory.js
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+/**
+ * @author Ed Spencer
+ * @class Ext.data.proxy.Memory
+ * @extends Ext.data.proxy.Client
+ *
+ * <p>In-memory proxy. This proxy simply uses a local variable for data storage/retrieval, so its contents are lost on
+ * every page refresh.</p>
+ *
+ * <p>Usually this Proxy isn't used directly, serving instead as a helper to a {@link Ext.data.Store Store} where a
+ * reader is required to load data. For example, say we have a Store for a User model and have some inline data we want
+ * to load, but this data isn't in quite the right format: we can use a MemoryProxy with a JsonReader to read it into
+ * our Store:</p>
+ *
+<pre><code>
+//this is the model we will be using in the store
+Ext.define('User', {
+    extend: 'Ext.data.Model',
+    fields: [
+        {name: 'id',    type: 'int'},
+        {name: 'name',  type: 'string'},
+        {name: 'phone', type: 'string', mapping: 'phoneNumber'}
+    ]
+});
+
+//this data does not line up to our model fields - the phone field is called phoneNumber
+var data = {
+    users: [
+        {
+            id: 1,
+            name: 'Ed Spencer',
+            phoneNumber: '555 1234'
+        },
+        {
+            id: 2,
+            name: 'Abe Elias',
+            phoneNumber: '666 1234'
+        }
+    ]
+};
+
+//note how we set the 'root' in the reader to match the data structure above
+var store = new Ext.data.Store({
+    autoLoad: true,
+    model: 'User',
+    data : data,
+    proxy: {
+        type: 'memory',
+        reader: {
+            type: 'json',
+            root: 'users'
+        }
+    }
+});
+</code></pre>
+ */
+Ext.define('Ext.data.proxy.Memory', {
+    extend: 'Ext.data.proxy.Client',
+    alias: 'proxy.memory',
+    alternateClassName: 'Ext.data.MemoryProxy',
+
+    /**
+     * @cfg {Array} data Optional array of Records to load into the Proxy
+     */
+
+    constructor: function(config) {
+        this.callParent([config]);
+
+        //ensures that the reader has been instantiated properly
+        this.setReader(this.reader);
+    },
+
+    /**
+     * Reads data from the configured {@link #data} object. Uses the Proxy's {@link #reader}, if present
+     * @param {Ext.data.Operation} operation The read Operation
+     * @param {Function} callback The callback to call when reading has completed
+     * @param {Object} scope The scope to call the callback function in
+     */
+    read: function(operation, callback, scope) {
+        var me     = this,
+            reader = me.getReader(),
+            result = reader.read(me.data);
+
+        Ext.apply(operation, {
+            resultSet: result
+        });
+
+        operation.setCompleted();
+        operation.setSuccessful();
+        Ext.callback(callback, scope || me, [operation]);
+    },
+
+    clear: Ext.emptyFn
+});