import org.eclipse.core.resources.IWorkspaceDescription;

/**

 * @bug 304841: [search] NPE in IndexSelector.initializeIndexLocations

 * @test Ensure that no NPE occurs when searching for a reference in a CU without primary type

 * @see "https://bugs.eclipse.org/bugs/show_bug.cgi?id=304841"

 */

public void testBug304841() throws Exception {

	boolean autoBuild = getWorkspace().isAutoBuilding();

	IWorkspaceDescription preferences = getWorkspace().getDescription();

	try {

		// ensure that the workspace auto-build is ON

		preferences.setAutoBuilding(true);

		getWorkspace().setDescription(preferences);

		// create test case

		IJavaProject project = createJavaProject("P");

		createFolder("/P/p");

		createFile(

			"/P/p/Hello.java",

			"package p;\n" + 

			"class One {\n" + 

			"}\n" + 

			"class Two {\n" + 

			"}\n"

		);

		createFile(

			"/P/p/Ref.java",

			"package p;\n" + 

			"class Three {\n" + 

			"	Two two;\n" + 

			"}\n"

		);

		waitUntilIndexesReady();

		// perform search

		final ICompilationUnit cu = getCompilationUnit("/P/p/Hello.java");

		IType type = cu.getType("Two");

		SearchPattern pattern = SearchPattern.createPattern(type, REFERENCES);

		MatchLocator.setFocus(pattern, type);

		new SearchEngine().search(

			pattern,

			new SearchParticipant[] {SearchEngine.getDefaultSearchParticipant()},

			SearchEngine.createJavaSearchScope(new IJavaElement[] { project }),

			this.resultCollector,

			null

		);

		assertSearchResults(

			"p/Ref.java p.Three.two [Two] EXACT_MATCH"

		);

	} finally {

		preferences.setAutoBuilding(autoBuild);

		getWorkspace().setDescription(preferences);

		deleteProject("P");

	}

}