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Home » Language IDEs » Java Development Tools (JDT) » JDT - Check Instances of RuntimeException class(To check if a Exception class is subclass of RuntimeException using the QualifiedName string)

JDT - Check Instances of RuntimeException class [message #1754877]

Thu, 23 February 2017 07:37

Eclipse User

hi

By using JDT (AST), I need to check using the Exception class's QualifiedName (string format) is an subclass of RuntimeException class?

Im using the below code:

IMethodBinding methodbinding = ((MethodDeclaration)node).resolveBinding().getMethodDeclaration();
ITypeBinding[] exceptiontypes = methodbinding.getExceptionTypes();

Thanks

Re: JDT - Check Instances of RuntimeException class [message #1754996 is a reply to message #1754877]

Sat, 25 February 2017 10:57

Eclipse User

3 steps:
- ask the IJavaProject for the IType for j.l.RuntimeException
- https://wiki.eclipse.org/JDT/FAQ#From_an_IJavaElement_to_an_IBinding
- ask the current exception type e.isSubTypeCompatible(runtimeExceptionBinding)

Re: JDT - Check Instances of RuntimeException class [message #1755232 is a reply to message #1754996]

Wed, 01 March 2017 06:11

Eclipse User

Thanks for the response. I followed the three steps you have mentioned, but not clear about how to get the "runtimeExceptionBinding" object.
Can you let me know what I'm doing wrong here?

   IType runtimeExcepType = cu.getJavaElement().getJavaProject().findType("java.lang.RuntimeException");
					String key = runtimeExcepType.getKey();
					ASTNode node1 = cu.findDeclaringNode(key);
					exceptionTypeBinding.isSubTypeCompatible(  ???   );

Re: JDT - Check Instances of RuntimeException class [message #1755261 is a reply to message #1755232]

Wed, 01 March 2017 13:05

Eclipse User

Suresh P wrote on Wed, 01 March 2017 12:11

Thanks for the response. I followed the three steps you have mentioned, but not clear about how to get the "runtimeExceptionBinding" object.
Can you let me know what I'm doing wrong here?

Your attempt stops one yard before the finish line.

You could inspect the node and get it's resolved binding, but its certainly easier to follow the other road using ASTParser.createBindings(..).

(I see that there's room for improving the FAQ in this item).

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