add Protocol for Sensor Observation Service r=ahocevar (closes #2373)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@9912 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Protocol.js

@@ -180,6 +180,22 @@ OpenLayers.Protocol = OpenLayers.Class({
     abort: function(response) {
     },
    
+    /**
+     * Method: createCallback
+     * Returns a function that applies the given public method with resp and
+     *     options arguments.
+     *
+     * Parameters:
+     * method - {Function} The method to be applied by the callback.
+     * response - {<OpenLayers.Protocol.Response>} The protocol response object.
+     * options - {Object} Options sent to the protocol method
+     */
+    createCallback: function(method, response, options) {
+        return OpenLayers.Function.bind(function() {
+            method.apply(this, [response, options]);
+        }, this);
+    },
+   
     CLASS_NAME: "OpenLayers.Protocol" 
 });