Unable to get correct Resource from IPackageBinding

[klaymore142]

Unable to get correct Resource from IPackageBinding

[brychcy]

You haven't really described your use case, but I suspect the following is what you want:

	IJavaElement element = binding.getJavaElement();
	while (element != null && !(element instanceof IPackageFragment)) {
		element = element.getParent();
	}
	IResource resource = element == null ? null : element.getResource();

[klaymore142]

Thanks - but this doesn't really resolve the issue.
I need 2 things - I need the correct IPackageBinding, and I need to get the correct IResource from it.
When we call binding.getPackage() to get the IPackageBinding, it's not clear whether this is giving us the correct binding since the package exists in 2 source roots. Our plugin uses this IPackageBinding in multiple places for a variety of things - one of those places calls getResource() on it, which gives us the wrong resource. The call to getResource() does not have access to the original ITypeBinding, which your example code requires.
I see 2 issues here:

1. The IPackageBinding returned is ambiguous - is it intended to represent the specific package within the same source root as the ITypeBinding?
2. When calling getResource() on the ITypeBinding, we cannot get the one we expect - which should be in a particular source root.

[brychcy]

Regarding 1.:
I think the IPackageBinding is not ambigous: it represents the whole package, corresponding to all source folders.
The contribution to a package by a single source folder is called a "package fragment".
(My code tried to show how to find the IJavaElement for one matching a given type.)

So there really is no "correct" resource corresponding for an IPackageBinding. Maybe pkg.getJavaElement().getResource() should throw an UnsupportedOperationException. But here the implemenation is slightly sloppy: pkg.getJavaElement() actually returns the JavaElement corresponding to its first contributing package fragment:

org.eclipse.jdt.core.dom.PackageBinding.getJavaElement():

	IJavaElement[] pkgs = nameLookup.findPackageFragments(getName(), false/*exact match*/);
           [...]
	return pkgs[0];

Regarding 2., I'm not sure, what you mean. for "ITypeBinding binding" corresponding to a source file, binding.getJavaElement().getResource() should return the File which is located in a source folder.