openlayers madness

public/lib/OpenLayers/Tile/WFS.js

@@ -0,0 +1,100 @@
+/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
+ * See http://svn.openlayers.org/trunk/openlayers/license.txt for the full
+ * text of the license. */
+// @require: OpenLayers/Tile.js
+/**
+* @class
+*/
+OpenLayers.Tile.WFS = Class.create();
+OpenLayers.Tile.WFS.prototype = 
+  Object.extend( new OpenLayers.Tile(), {
+
+    /** @type Array(OpenLayers.Feature)*/ 
+    features: null,
+
+
+    /** 
+    * @constructor
+    *
+    * @param {OpenLayers.Layer} layer
+    * @param {OpenLayers.Pixel} position
+    * @param {OpenLayers.Bounds} bounds
+    * @param {String} url
+    * @param {OpenLayers.Size} size
+    */
+    initialize: function(layer, position, bounds, url, size) {
+        OpenLayers.Tile.prototype.initialize.apply(this, arguments);
+        
+        this.features = new Array();
+    },
+
+    /**
+     * 
+     */
+    destroy: function() {
+        for(var i=0; i < this.features.length; i++) {
+            this.features[i].destroy();
+        }
+        OpenLayers.Tile.prototype.destroy.apply(this, arguments);
+    },
+
+    /**
+    */
+    draw:function() {
+        this.loadFeaturesForRegion(this.requestSuccess);        
+    },
+
+    
+    /** get the full request string from the ds and the tile params 
+    *     and call the AJAX loadURL(). 
+    *
+    *     input are function pointers for what to do on success and failure.
+    * 
+    * @param {function} success
+    * @param {function} failure
+    */
+    loadFeaturesForRegion:function(success, failure) {
+
+        if (!this.loaded) {
+        
+            if (this.url != "") {
+        
+                // TODO: Hmmm, this stops multiple loads of the data when a 
+                //       result isn't immediately retrieved, but it's hacky. 
+                //       Do it better.
+                this.loaded = true; 
+                OpenLayers.loadURL(this.url, null, this, success, failure);
+            }
+        }
+    },
+    
+    /** Return from AJAX request
+    *
+    * @param {} request
+    */
+    requestSuccess:function(request) {
+        var doc = request.responseXML;
+        
+        if (!doc || request.fileType!="XML") {
+            doc = OpenLayers.parseXMLString(request.responseText);
+        }
+        
+        var resultFeatures = doc.getElementsByTagName("featureMember");
+            
+        //clear old featureList
+        this.features = new Array();
+
+        for (var i=0; i < resultFeatures.length; i++) {
+        
+            var feature = new this.layer.featureClass(this.layer, 
+                                                      resultFeatures[i]);
+            this.features.append(feature);
+        }
+        
+    },
+
+    /** @final @type String */
+    CLASS_NAME: "OpenLayers.Tile.WFS"
+  }
+);
+