Use the EmbededClassLoader to get full access to an embeded swf file, including all classes,

functions and namespaces defined in it.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4502 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/util/EmbededClassLoader.as

@@ -0,0 +1,83 @@
+package com.threerings.util {
+
+import flash.display.Loader;
+import flash.errors.IllegalOperationError;
+import flash.events.Event;
+import flash.events.EventDispatcher;
+import flash.events.IOErrorEvent;
+import flash.utils.ByteArray;
+import flash.system.ApplicationDomain;
+import flash.system.LoaderContext;
+
+/**
+ * Allows you to load an embeded SWF stored as a Byte Array then access any stored classes
+ * within the SWF.
+ */
+public class EmbededClassLoader extends EventDispatcher 
+{
+    public static var SWF_LOADED :String = "swfLoaded";
+    public static var LOAD_ERROR :String = "loadError";
+
+    public function EmbededClassLoader ()
+    {
+        _loader = new Loader();
+        _loader.contentLoaderInfo.addEventListener(Event.COMPLETE, completeHandler);
+        _loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler);
+    }
+
+    /**
+     * Load the SWF from a Byte Array.  A CLASS_LOADED event will be dispatched on successful 
+     * completion of the load.  If any errors occur, a LOAD_ERROR event will be dispatched.
+     */
+    public function load (byteArray :ByteArray) :void
+    {
+        var context :LoaderContext = new LoaderContext();
+        context.applicationDomain = ApplicationDomain.currentDomain;
+        _loader.loadBytes(byteArray, context);
+    }
+
+    /**
+     * Retrieves a class definition from the loaded swf.
+     *
+     * @throws IllegalOperationError when the swf has not completed loading or the class does
+     * not exist
+     */
+    public function getClass (className :String) :Class
+    {
+        if (_loader.contentLoaderInfo.bytesLoaded != _loader.contentLoaderInfo.bytesTotal) {
+            throw new IllegalOperationError("SWF has not completed loading");
+        }
+        try {
+            return _loader.contentLoaderInfo.applicationDomain.getDefinition(className) as Class;
+        } catch (e: Error) {
+            throw new IllegalOperationError(className + " definition not found");
+        }
+        return null;
+    }
+
+    /**
+     * Checks if a class exists in the library.
+     *
+     * @throws IllegalOperationError when the swf has not completed loading.
+     */
+    public function isClass (className :String) :Boolean
+    {
+        if (_loader.contentLoaderInfo.bytesLoaded != _loader.contentLoaderInfo.bytesTotal) {
+            throw new IllegalOperationError("SWF has not completed loading");
+        }
+        return _loader.contentLoaderInfo.applicationDomain.hasDefinition(className);
+    }
+
+    protected function completeHandler (e :Event) :void
+    {
+        dispatchEvent(new Event(SWF_LOADED));
+    }
+
+    protected function ioErrorHandler (E :Event) :void
+    {
+        dispatchEvent(new Event(LOAD_ERROR));
+    }
+
+    protected var _loader :Loader;
+}
+}