Adding OpenLayers.Strategy.Fixed: A simple strategy that requests features once and never requests new data. r=elemoine, (Closes #1664)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@7707 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Strategy/Fixed.js

@@ -0,0 +1,63 @@
+/* Copyright (c) 2006-2008 MetaCarta, Inc., published under the Clear BSD
+ * license.  See http://svn.openlayers.org/trunk/openlayers/license.txt for the
+ * full text of the license. */
+
+/**
+ * @requires OpenLayers/Strategy.js
+ */
+
+/**
+ * Class: OpenLayers.Strategy.Fixed
+ * A simple strategy that requests features once and never requests new data.
+ *
+ * Inherits from:
+ *  - <OpenLayers.Strategy>
+ */
+OpenLayers.Strategy.Fixed = OpenLayers.Class(OpenLayers.Strategy, {
+
+    /**
+     * Constructor: OpenLayers.Strategy.Fixed
+     * Create a new Fixed strategy.
+     *
+     * Parameters:
+     * options - {Object} Optional object whose properties will be set on the
+     *     instance.
+     */
+    initialize: function(options) {
+        OpenLayers.Strategy.prototype.initialize.apply(this, [options]);
+    },
+
+    /**
+     * APIMethod: destroy
+     * Clean up the strategy.
+     */
+    destroy: function() {
+        OpenLayers.Strategy.prototype.destroy.apply(this, arguments);
+    },
+
+    /**
+     * Method: activate
+     * Activate the strategy: reads all features from the protocol and add them 
+     * to the layer.
+     */
+    activate: function() {
+        OpenLayers.Strategy.prototype.activate.apply(this, arguments);
+        this.layer.protocol.read({
+            callback: this.merge,
+            scope: this
+        });
+    },
+
+    /**
+     * Method: merge
+     * Add all features to the layer.
+     */
+    merge: function(resp) {
+        var features = resp.features;
+        if (features && features.length > 0) {
+            this.layer.addFeatures(features);
+        }
+    },
+
+    CLASS_NAME: "OpenLayers.Strategy.Fixed"
+});