CODEWITHSUNDEEP
javainstanceof
ryvantage
ryvantage

Reputation: 13496

Pass classname to method

My programs tend to use a lot of wrapped exceptions (SwingWorker, for instance, wraps all its exceptions in ExecutionException). So, I am trying to write a method that will allow me to check if an exception or any of its causes is an instanceof an exception type, but I don't know how (if it is even possible) to pass JUST a class name as an argument to a method.

So far, I have this:

public static boolean errorOrCausesInstanceOfClass(Throwable e, Class c) {
    return e != null && (e.getClass().equals(c) || (e.getCause() != null && errorOrCausesInstanceOfClass(e.getCause(), c)));
}

But this will only work if e.getClass() is exactly equal to c.getClass(). But I'd like to check using instanceof to catch subclasses as well.

Is there a way to accomplish this?

Upvotes: 3

Views: 124

Answers (3)

evanchooly
evanchooly

Reputation: 6243

Look at Class.isAssignableFrom().

Upvotes: 4

ZhongYu
ZhongYu

Reputation: 19702

See the handy method Class.isInstance()

    if( ... c.isInstance(e) ...

Upvotes: 1

Claas Wilke
Claas Wilke

Reputation: 1991

Try use 

Class.isAssignableFrom(Class clazz)

http://docs.oracle.com/javase/7/docs/api/java/lang/Class.html#isAssignableFrom(java.lang.Class)

Upvotes: 7

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