How to identify if Class reference is an interface?

As in Java I want to know if my reference is declared as Interface.

function foo(classRef:Class){

if(cla开发者_运维知识库ssRef.isInterface(){
  //something
}

}

You can use AS3 Commons Reflect to get this information. Your function would then look something like this:

function foo(classRef:Class)
{
    var type:Type = Type.forClass(classRef);

    if (type.isInterface)
    {
        //something
    }
}

My own exploring. If class is interface, than in description XML in <factory> node it will never contain <constructor> and <extendsClass>. So, this is a function:

private function isInterface(type : *):Boolean {
        var description : XML = describeType(type);
        return (description.factory[0].descendants("constructor").length() == 0
                && description.factory[0].descendants("extendsClass").length() == 0);
}

Test:

trace(isInterface(IEventDispatcher));
trace(isInterface(Button));
trace(isInterface(int));
trace(isInterface(XML));
trace(isInterface(String));

Output:

[trace] true
[trace] false
[trace] false
[trace] false
[trace] false