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NullLiteral.resolveConstantExpressionValue() gives null [message #1712343]

Fri, 23 October 2015 08:16

Ivan Ivan

Messages: 57
Registered: May 2015

Member

Hi,
I have a code like

Object returnValue = null;
return returnValue;

When I call SimpleName.resolveConstantExpressionValue() (this is returnValue), I always get null, but it's the same result when resolving was failed. How to make sure that this null is related to NullLiteral, but not just a unsucceeded result?

Thanks

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Re: NullLiteral.resolveConstantExpressionValue() gives null [message #1712403 is a reply to message #1712343]

Fri, 23 October 2015 15:46

Erick Hagstrom

Messages: 107
Registered: April 2014
Location: USA

Senior Member

I don't think you can, short of doing some sort of flow analysis that brings you back to the NullLiteral.

<microrant>Null is evil.</microrant>

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Re: NullLiteral.resolveConstantExpressionValue() gives null [message #1712419 is a reply to message #1712403]

Fri, 23 October 2015 23:31

Stephan Herrmann

Messages: 1853
Registered: July 2009

Senior Member

SimpleName.resolveConstantExpressionValue() will only ever return a non-null value, if the name is a compile time constant, i.e., it must be final and the exact value is known to the compiler.
The null type is represented by an ITypeBinding answering true to #isNullType().

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