b=395004. p=paul.rouget, r=mfinkle, dtownsend, gavin, a=mconnor. Add enaled property to FUEL Extension object

browser/fuel/public/fuelIApplication.idl

@@ -284,6 +284,11 @@ interface fuelIExtension : nsISupports
    */
   readonly attribute AString name;
   
+  /**
+   * Check if the extension is currently enabled, or not.
+   */
+  readonly attribute boolean enabled;
+  
   /**
    * The version number of the extension.
    */

browser/fuel/src/fuelApplication.js

@@ -401,6 +401,19 @@ function Extension(aItem) {
     this._firstRun = true;
   }
 
+  this._enabled = false;
+  const PREFIX_ITEM_URI = "urn:mozilla:item:";
+  const PREFIX_NS_EM = "http://www.mozilla.org/2004/em-rdf#";
+  var rdf = Cc["@mozilla.org/rdf/rdf-service;1"].getService(Ci.nsIRDFService);
+  var itemResource = rdf.GetResource(PREFIX_ITEM_URI + this._item.id);
+  if (itemResource) {
+    var extmgr = Cc["@mozilla.org/extensions/manager;1"].getService(Ci.nsIExtensionManager);
+    var ds = extmgr.datasource;
+    var target = ds.GetTarget(itemResource, rdf.GetResource(PREFIX_NS_EM + "isDisabled"), true);
+    if (target && target instanceof Ci.nsIRDFLiteral)
+      this._enabled = (target.Value != "true");
+  }
+
   var os = Components.classes["@mozilla.org/observer-service;1"]
                      .getService(Ci.nsIObserverService);
   os.addObserver(this, "em-action-requested", false);
@@ -449,6 +462,10 @@ Extension.prototype = {
     return this._item.name;
   },
 
+  get enabled() {
+    return this._enabled;
+  },
+
   get version() {
     return this._item.version;
   },

browser/fuel/test/browser_Extensions.js

@@ -22,6 +22,7 @@ function test() {
   // The known version number changes too frequently to hardcode in
   ok(inspector.version, "Check 'Extension.version' for known extension");
   ok(inspector.firstRun, "Check 'Extension.firstRun' for known extension");
+  ok(inspector.enabled, "Check 'Extension.enabled' for known extension");
   
   // test to see if extension find works
   is(Application.extensions.all.length, 1, "Check a find for all extensions");