AS3 - 我可以知道,如果一个类实现一个接口(或者是另一个类的子类)? [英] AS3 - Can I know if a class implements an interface (or is a subclass of another class)?
问题描述
通过这个code
function someFunction(classParam:Class):Boolean
{
// how to know if classParam implements some interface?
}
即。比较 classParam
与 IEventDispatcher,请
接口:
someFunction(EventDispatcher) // returns true
someFunction(Object) // returns false
我知道它不能与做的是
运营商。但是,有没有办法做到这一点?有没有办法知道,如果一个类实现某个接口? (或者是其他类的子类?)
I know it can't be done with is
operator. But, is there a way to do it? Is there a way to know if a class implements some interface? (or is a subclass of another class?)
可能的解决方案:
一个。创建 classParam
的对象,并使用该对象使用比较是
运营商。
A. Creating an object of classParam
and using that object to compare using is
operator.
function someFunction(classParam:Class):Boolean
{
return (new classParam()) is IEventDispatcher
}
乙。使用不如describeType()
function someFunction(classParam:Class):Boolean
{
var xml:XML = describeType(classParam)
// found "implementsInterface" value in xml and compare to IEventDispatcher
}
有一种方法不使用不如describeType
或创建一个新
运营商?
There is a way that DOES NOT USE describeType
or creates a new
operator?
推荐答案
我看不出有任何的方式来实现你想要做的只是用什么不如describeType
。照片
它已经为此创建了,你为什么不希望使用它?
I don't see any way to achieve what you're trying to do except by using describeType
.
It has been created for this purpose, why don't you want to use it?
编辑:
它实际上只需要2行要做到这一点:
It actually only takes 2 lines to do this :
var classDescription:XML = describeType(classParam);
return (classDescription.factory.implementsInterface.(@type == getQualifiedClassName(IEventDispatcher)).length() != 0);
...或者只是一个,如果它是什么困扰你:
...or just in one, if it's what bothers you:
return (describeType(classParam).factory.implementsInterface.(@type == getQualifiedClassName(IEventDispatcher)).length() != 0);
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