Dynamic Proxy for ActionScript 3.0

Dynamic proxy allows to intercept class source behaviour by proxy, which doesn't extend source class. Proxeing is configured by different types of interceptors.

Examples

Intercept the whole class by another class

var proxyHolder:ProxyHolder = new ProxyHolder();

// ProxyClass is dynamic proxy for SourceClass
proxyHolder.setInterceptedClass(SourceClass, new ProxyClass());
proxyHolder.addEventListener(Event.COMPLETE, onProxyComplete);
proxyHolder.addEventListener(ErrorEvent.ERROR, onProxyError);
proxyHolder.addEventListener(IOErrorEvent.IO_ERROR, onProxyError);
proxyHolder.init();

function onProxyComplete(event:Event):void
{
  // Create proxy for SourceClass. Real instance will be instance of ProxyClass
  var source:SourceClass = proxyHolder.createProxy(SourceClass) as SourceClass;
  
  // Setter and getter of ProxyClass, because the whole SourceClass is dynamically proxied by ProxyClass
  source.property1 = TEST_STRING;
  trace(source.property1);
  
  // And method is called from ProxyClass
  source.addPrefixToProperty1();
}

Intercept specified method by other method

var proxyHolder:ProxyHolder = new ProxyHolder();

var proxy:ProxyClass = new ProxyClass();
// Proxy for only one property (property1) of SourceClass
proxyHolder.setInterceptedProperty(SourceClass, "property1", proxy, "property2");

proxyHolder.addEventListener(Event.COMPLETE, onProxyComplete);
proxyHolder.addEventListener(ErrorEvent.ERROR, onProxyError);
proxyHolder.addEventListener(IOErrorEvent.IO_ERROR, onProxyError);
proxyHolder.init();

function onProxyComplete(event:Event):void
{
  // Only this property (property1) is proxied
  var source:SourceClass = proxyHolder.createProxy(SourceClass) as SourceClass;

  // Setter and getter of ProxyClass. Other properties and methods will be from SourceClass
  source.property1 = TEST_STRING;
  trace(source.property1);
}