[news.eclipse.tools.jdt] Re: Searching for implementers of multiple inte

[Frederic Fusier <frederic_fusier@xxxxxxxxxx>]

Gerry Kessler wrote:
> Thanks for the response Frederic.
>
> Yes, I want to use the createAndPattern method.  I stupidly said union 
> when I should have said intersection.
>
> Before I enter a bug, do you see anything wrong with the code snippet 
> below?  I have verified in the debugger that the list of elems contains 
> valid interface ITypes and that the constructed SearchPatterns are not 
> null.
>
>
>     JavaSearchScopeFactory factory= JavaSearchScopeFactory.getInstance();
>     IJavaSearchScope scope= factory.createJavaSearchScope(new 
> IJavaElement[]{myJavaProject}, false);
>     
>     SearchPattern patternA = 
> SearchPattern.createPattern((IJavaElement)elems.get(0), 
> IJavaSearchConstants.IMPLEMENTORS, 0);
>     SearchPattern patternB = 
> SearchPattern.createPattern((IJavaElement)elems.get(1), 
> IJavaSearchConstants.IMPLEMENTORS, 0);
>     SearchPattern andedPattern = 
> SearchPattern.createAndPattern(patternA, patternB);
>     
>     SearchRequestor requestor = new Searcher();
>     SearchEngine engine = new SearchEngine();
>     try {
>         engine.search(andedPattern, new SearchParticipant[]  
> {SearchEngine.getDefaultSearchParticipant()}, scope, requestor, null);
>     } catch (CoreException e) {
>         ...
>     }
>     ...
>     
> This results in a NullPointerException in MatchLocator when I call 
> engine.search:
>
>     java.lang.NullPointerException
>     at 
> org.eclipse.jdt.internal.core.search.matching.MatchLocator.<init>(MatchLocator.java:351) 
>
>     at 
> org.eclipse.jdt.internal.core.search.JavaSearchParticipant.locateMatches(JavaSearchParticipant.java:85) 
>
>     at 
> org.eclipse.jdt.internal.core.search.BasicSearchEngine.findMatches(BasicSearchEngine.java:212) 
>
>     at 
> org.eclipse.jdt.internal.core.search.BasicSearchEngine.search(BasicSearchEngine.java:503) 
>
>     at 
> org.eclipse.jdt.core.search.SearchEngine.search(SearchEngine.java:538)
>     ...
>     
>     
> The problem seems to stem from the static method 
> PatternLocator.patternLocator(SearchPattern pattern) returning null.  
> Regards,
> Gerry Kessler
> WTP JSF Tools Team
Your snippet is perfectly correct, this implementation for AndPattern 
which is not... :-(
Please open the bug and I'll have a look at it ASAP.
Thanks