implement versioned format base class, r=ahocevar (closes #2954)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@12155 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Format/WFSCapabilities.js

@@ -4,8 +4,7 @@
  * full text of the license. */
 
 /**
- * @requires OpenLayers/Format/XML.js
- * @requires OpenLayers/Format/OGCExceptionReport.js
+ * @requires OpenLayers/Format/XML/VersionedOGC.js
  */
 
 /**
@@ -13,21 +12,24 @@
  * Read WFS Capabilities.
  * 
  * Inherits from:
- *  - <OpenLayers.Format.XML>
+ *  - <OpenLayers.Format.XML.VersionedOGC>
  */
-OpenLayers.Format.WFSCapabilities = OpenLayers.Class(OpenLayers.Format.XML, {
+OpenLayers.Format.WFSCapabilities = OpenLayers.Class(OpenLayers.Format.XML.VersionedOGC, {
     
     /**
      * APIProperty: defaultVersion
      * {String} Version number to assume if none found.  Default is "1.1.0".
      */
     defaultVersion: "1.1.0",
-    
+ 
     /**
-     * APIProperty: version
-     * {String} Specify a version string if one is known.
+     * APIProperty: errorProperty
+     * {String} Which property of the returned object to check for in order to
+     * determine whether or not parsing has failed. In the case that the
+     * errorProperty is undefined on the returned object, the document will be
+     * run through an OGCExceptionReport parser.
      */
-    version: null,
+    errorProperty: "service",
 
     /**
      * Constructor: OpenLayers.Format.WFSCapabilities
@@ -48,34 +50,6 @@ OpenLayers.Format.WFSCapabilities = OpenLayers.Class(OpenLayers.Format.XML, {
      * Returns:
      * {Array} List of named layers.
      */
-    read: function(data) {
-        if(typeof data == "string") {
-            data = OpenLayers.Format.XML.prototype.read.apply(this, [data]);
-        }
-        var root = data.documentElement;
-        var version = this.version;
-        if(!version) {
-            version = root.getAttribute("version");
-            if(!version) {
-                version = this.defaultVersion;
-            }
-        }
-        var constr = OpenLayers.Format.WFSCapabilities[
-            "v" + version.replace(/\./g, "_")
-        ];
-        if(!constr) {
-            throw "Can't find a WFS capabilities parser for version " + version;
-        }
-        var parser = new constr(this.options);
-        var capabilities = parser.read(data);
-        if (capabilities.service === undefined) {
-            // an error must have happened, so parse it and report back
-            var format = new OpenLayers.Format.OGCExceptionReport();
-            capabilities.error = format.read(data);
-        }
-        capabilities.version = version;
-        return capabilities;
-    },
     
     CLASS_NAME: "OpenLayers.Format.WFSCapabilities"