+GNU General Public License Usage
+This file may be used under the terms of the GNU General Public License version 3.0 as published by the Free Software Foundation and appearing in the file LICENSE included in the packaging of this file. Please review the following information to ensure the GNU General Public License version 3.0 requirements will be met: http://www.gnu.org/copyleft/gpl.html.
+
+If you are unsure which license is appropriate for your use, please contact the sales department at http://www.sencha.com/contact.
+
+*/
+/**
+ * Represents a filter that can be applied to a {@link Ext.util.MixedCollection MixedCollection}. Can either simply
+ * filter on a property/value pair or pass in a filter function with custom logic. Filters are always used in the
+ * context of MixedCollections, though {@link Ext.data.Store Store}s frequently create them when filtering and searching
+ * on their records. Example usage:
+ *
+ * //set up a fictional MixedCollection containing a few people to filter on
+ * var allNames = new Ext.util.MixedCollection();
+ * allNames.addAll([
+ * {id: 1, name: 'Ed', age: 25},
+ * {id: 2, name: 'Jamie', age: 37},
+ * {id: 3, name: 'Abe', age: 32},
+ * {id: 4, name: 'Aaron', age: 26},
+ * {id: 5, name: 'David', age: 32}
+ * ]);
+ *
+ * var ageFilter = new Ext.util.Filter({
+ * property: 'age',
+ * value : 32
+ * });
+ *
+ * var longNameFilter = new Ext.util.Filter({
+ * filterFn: function(item) {
+ * return item.name.length > 4;
+ * }
+ * });
+ *
+ * //a new MixedCollection with the 3 names longer than 4 characters
+ * var longNames = allNames.filter(longNameFilter);
+ *
+ * //a new MixedCollection with the 2 people of age 24:
+ * var youngFolk = allNames.filter(ageFilter);
+ *