completions contributor for strings

Hi,

I would like to provide some suggestions for a given method, where only certain strings are applicable. Eg:

class Bar {
 void foo(String str) {}
}

// usage
new Bar().foo(<caret>) // should suggest: Aaaa, Bbbb etc

This would be very similar to that provided for charsets, for example.

After some puzzling I found that this is implemented through an EncodingReferenceInjector, and an EncodingReference which implements getVariants. The actual relevant places where this reference should be used are defined in javaInjections.xml (which looks a little cumbersome).

The other way of implementing this, as far as I can tell, is using CompletionContributor. But there I have problems in finding out what the fully qualified method is in which the completions have been invoked, in order to tell whether to provide any suggestions or not.

I guess my questions are:

1. Which method should one normally use.

2. Is there any example of the latter, or a way of say given this doc: "".substring(<caret>) - getting the method reference to String.substring(int). I can do it when the caret is in the method name, but struggling when the caret is in the parens.

Thanks in advance,

jamie