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Syntax of compound names for nested classes [message #1410672]

Thu, 21 August 2014 10:57

Andreas Sewe

Messages: 111
Registered: June 2013

Senior Member

Hi,

I have a problem getting anything other than ProblemReferenceBindings (ProblemReasons.InternalNameProvided) out of my LookupEnvironment when searching for nested classes.

  ["java", "util", "Map$Entry"]

produces the aforementioned ProblemReferenceBinding.

  ["java", "util", "Map", "Entry"]

produces null as does

  ["java", "util", "Map.Entry"]

What's the problem syntax for compound names for nested classes then? Any hints are appreciated.

The PackageBinding for "java.util" has, in its "knownTypes" HashtableOfType an entry for "Map$Entry", so that seems like the proper syntax, but this fails the final

  referenceBinding.isNestedType()

check and results in the ProblemReferenceBinding (which is far less useful than a regular ReferenceBinding; in particular, getMethods doesn't do anything useful).

Best wishes,

Andreas

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Re: Syntax of compound names for nested classes [message #1410690 is a reply to message #1410672]

Thu, 21 August 2014 11:45

Stephan Herrmann

Messages: 1853
Registered: July 2009

Senior Member

Disclaimer: all these are internal classes, not public API (I know that Andreas knows this, just to note for casual readers Smile

)

It seems none of the methods in LookupEnvironment which are used when resolving a BinaryTypeBinding from .class are accessible to clients.

This implies you'd have to follow the strategy used when resolving AST (source). In that case the compiler doesn't just throw the fully qualified name at the LookupEnvironment but resolves the reference in steps. This means: chop off as much from the tail of the name as needed to get a valid answer from LE. Once you have the ReferenceBinding for the toplevel type, ask it getMemberType(char[]).

HTH,
Stephan

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Re: Syntax of compound names for nested classes [message #1410699 is a reply to message #1410690]

Thu, 21 August 2014 12:16

Andreas Sewe

Messages: 111
Registered: June 2013

Senior Member

Hi Stephan. yes this helps, if only to make me search for a simpler solution (for my special case). Wink

As I know that there will be only closest match (since the compound name is derived from the unique declaring type's signature I get from a method completion proposal), I think the following is safe:

ReferenceBinding result = env.getType(compoundName);
if (result instanceof ProblemReferenceBinding) {
    result = (ReferenceBinding) ((ProblemReferenceBinding) result).closestMatch();
}

But I will definitely back this up with test cases.

Anyway, thank you for you help. Much appreciated.

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