yahoo/util/YUIBridge.as

package com.yahoo.util
 {
        import flash.display.Stage;
        import flash.external.ExternalInterface;
        import flash.utils.getDefinitionByName;

        public class YUIBridge extends Object
        {
            public var flashvars:Object;
            private var _jsHandler:String;
            private var _swfID:String;
            private var _yId:String;

            private var _stage:Stage;

            private var _instances:Object = {};

            public function YUIBridge(stage:Stage)
            {
                _stage = stage;

                flashvars = _stage.loaderInfo.parameters;

                if (flashvars["yId"] && flashvars["YUIBridgeCallback"] && flashvars["YUISwfId"] && ExternalInterface.available) {
                    _jsHandler = flashvars["YUIBridgeCallback"];
                    _swfID = flashvars["YUISwfId"];
                    _yId = flashvars["yId"];
                }

                ExternalInterface.addCallback("createInstance", createInstance);
                ExternalInterface.addCallback("exposeMethod", exposeMethod);
                ExternalInterface.addCallback("getProperty", getProperty);
                ExternalInterface.addCallback("setProperty", setProperty);

            }

            public function createInstance(instanceId:String, className:String, constructorArguments:Array = null) : void {

                constructorArguments == null ? constructorArguments = [] : constructorArguments = constructorArguments;

                var cA:Array = constructorArguments;
                var classReference:Class = getDefinitionByName(className) as Class;

                var instance:Object;

                switch (cA.length) {
                default: instance = new classReference();
                case 1: instance = new classReference(cA[0]);
                case 2: instance = new classReference(cA[0], cA[1]);
                case 3: instance = new classReference(cA[0], cA[1], cA[2]);
                case 4: instance = new classReference(cA[0], cA[1], cA[2], cA[3]);
                case 5: instance = new classReference(cA[0], cA[1], cA[2], cA[3], cA[4]);
                case 6: instance = new classReference(cA[0], cA[1], cA[2], cA[3], cA[4], cA[5]);
                case 7: instance = new classReference(cA[0], cA[1], cA[2], cA[3], cA[4], cA[5], cA[6]);
                case 8: instance = new classReference(cA[0], cA[1], cA[2], cA[3], cA[4], cA[5], cA[6], cA[7]);
                case 9: instance = new classReference(cA[0], cA[1], cA[2], cA[3], cA[4], cA[5], cA[6], cA[7], cA[8]);
                case 10: instance = new classReference(cA[0], cA[1], cA[2], cA[3], cA[4], cA[5], cA[6], cA[7], cA[8], cA[9]);
                case 11: instance = new classReference(cA[0], cA[1], cA[2], cA[3], cA[4], cA[5], cA[6], cA[7], cA[8], cA[9], cA[10]);
                case 12: instance = new classReference(cA[0], cA[1], cA[2], cA[3], cA[4], cA[5], cA[6], cA[7], cA[8], cA[9], cA[10], cA[11]);
                case 13: instance = new classReference(cA[0], cA[1], cA[2], cA[3], cA[4], cA[5], cA[6], cA[7], cA[8], cA[9], cA[10], cA[11], cA[12]);
                }

                _instances[instanceId] = instance;
            }

            public function exposeMethod(instanceId:String, methodName:String, exposedName:String = "") : void {
                exposedName == "" ? exposedName = methodName : exposedName = exposedName;

                if (_instances[instanceId] && ExternalInterface.available) {
                    ExternalInterface.addCallback(exposedName, _instances[instanceId][methodName]);
                }
            }

            public function getProperty (instanceId:String, propertyName:String) : Object {
                if (_instances[instanceId] && _instances[instanceId].hasOwnProperty(propertyName)) {
                    return _instances[instanceId][propertyName];
                }
                else {
                    return null;
                }
            }

            public function setProperty (instanceId:String, propertyName:String, propertyValue:Object) : void {
                if (_instances[instanceId] && _instances[instanceId].hasOwnProperty(propertyName)) {
                    _instances[instanceId][propertyName] = propertyValue;
                }
            }

            public function addCallbacks (callbacks:Object) : void {
                    if (ExternalInterface.available) {
                        for (var callback:String in callbacks) {
                            trace("Added callback for " + callback + ", function " + callbacks[callback]);
                            ExternalInterface.addCallback(callback, callbacks[callback]);
                        }
                        sendEvent({type:"swfReady"});
                    }
                }

                public function sendEvent (evt:Object) : void {
                    if (ExternalInterface.available) {
                    trace("Sending event -- " + evt);
                    trace("Sending to " + _yId);
                    trace("Calling " + _jsHandler);

                    ExternalInterface.call("YUI.applyTo", _yId, _jsHandler, [_swfID, evt]);
                    }

            }
        }
    }