if (delta.getKind() == IJavaElementDelta.ADDED && !cu.isPrimary())	

			return false;

/*

 * Ensures that getting a non-primary working copy does NOT trigger

 * a type hierarchy notification for the concerned hierarchy. 

 * See https://bugs.eclipse.org/bugs/show_bug.cgi?id=275805

 */

public void testGetWorkingCopy() throws CoreException {

	ITypeHierarchy h = null;

	ICompilationUnit superCopy = null;

	ICompilationUnit aWorkingCopy = null;

	try {

		createJavaProject("P");

		createFolder("/P/p");

		createFile(

			"/P/p/IX.java",

			"package p;\n" +

			"public interface IX {\n" +

			"}"

		);

		createFile(

				"/P/p/X.java",

				"package p;\n" +

				"public class X implements IX{\n" +

				"}"

			);

		superCopy = getCompilationUnit("/P/p/IX.java");

		superCopy.becomeWorkingCopy(null/*no progress*/);

		h = superCopy.getType("IX").newTypeHierarchy(null);		

		h.addTypeHierarchyChangedListener(this);

		aWorkingCopy = getCompilationUnit("P/p/X.java").getWorkingCopy(null);

		assertTrue("Should receive NO change", !this.changeReceived);

	} finally {

		if (h != null)

			h.removeTypeHierarchyChangedListener(this);

		if (aWorkingCopy != null)

			aWorkingCopy.discardWorkingCopy();

		if (superCopy!= null)

			superCopy.discardWorkingCopy();

		deleteProject("P");

	}

}