/*
 * Copyright 2006-2007 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

/*
 * @test
 * @bug 6397298 6400986 6425592 6449798 6453386 6508401
 * @summary Tests that getElementsAnnotatedWith works properly.
 * @author  Joseph D. Darcy
 * @compile TestElementsAnnotatedWith.java
 * @compile InheritedAnnotation.java
 * @compile -processor TestElementsAnnotatedWith -proc:only SurfaceAnnotations.java
 * @compile -processor TestElementsAnnotatedWith -proc:only BuriedAnnotations.java
 * @compile -processor TestElementsAnnotatedWith -proc:only Part1.java Part2.java
 * @compile -processor TestElementsAnnotatedWith -proc:only TestElementsAnnotatedWith.java
 * @compile -processor TestElementsAnnotatedWith -proc:only C2.java
 */

import java.lang.annotation.Annotation;
import java.util.Collections;
import java.util.Set;
import java.util.HashSet;
import java.util.Arrays;
import javax.annotation.processing.*;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.*;
import javax.lang.model.util.*;
import static javax.lang.model.util.ElementFilter.*;

/**
 * This processor verifies that the information returned by
 * getElementsAnnotatedWith is consistent with the expected results
 * stored in an AnnotatedElementInfo annotation.
 */
@SupportedAnnotationTypes("*")
@AnnotatedElementInfo(annotationName="java.lang.SuppressWarnings", expectedSize=0, names={})
public class TestElementsAnnotatedWith extends AbstractProcessor {

    public boolean process(Set<? extends TypeElement> annotations,
                           RoundEnvironment roundEnvironment) {
	Elements elementUtils = processingEnv.getElementUtils();

	TypeElement annotatedElementInfoElement = 
	    elementUtils.getTypeElement("AnnotatedElementInfo");
	Set<? extends Element> resultsMeta = Collections.emptySet();
	Set<? extends Element> resultsBase = Collections.emptySet();

        if (!roundEnvironment.processingOver()) {
	    testNonAnnotations(roundEnvironment);

	    // Verify AnnotatedElementInfo is present on the first
	    // specified type.

	    TypeElement firstType = typesIn(roundEnvironment.getRootElements()).iterator().next();
	    
	    AnnotatedElementInfo annotatedElementInfo = firstType.getAnnotation(AnnotatedElementInfo.class);

	    boolean failed = false;

	    if (annotatedElementInfo == null)
		throw new IllegalArgumentException("Missing AnnotatedElementInfo annotation on " +
						  firstType);
	    else {
		// Verify that the annotation information is as
		// expected.
		
		Set<String> expectedNames = new HashSet<String>(Arrays.asList(annotatedElementInfo.names()));

		resultsMeta = 
		    roundEnvironment.
		    getElementsAnnotatedWith(elementUtils.
					     getTypeElement(annotatedElementInfo.
							    annotationName())) ;

		System.err.println("Results: " + resultsMeta);

		if (resultsMeta.size() != annotatedElementInfo.expectedSize()) {
		    failed = true;
		    System.err.printf("Bad number of elements; expected %d, got %d%n",
				      annotatedElementInfo.expectedSize(), resultsMeta.size());
		} else {
		    for(Element element : resultsMeta) {
			String simpleName = element.getSimpleName().toString();
			if (!expectedNames.contains(simpleName) ) {
			    failed = true;
			    System.err.println("Name ``" + simpleName + "'' not expected.");
			}
		    }
		}
	    }

	    resultsBase = computeResultsBase(roundEnvironment, annotatedElementInfo.annotationName());

	    if (!resultsMeta.equals(resultsBase)) {
		failed = true;
		System.err.println("Base and Meta sets unequal;\n meta: " + resultsMeta + 
				   "\nbase: " + resultsBase);
	    }

	    if (failed) {
		System.err.println("AnnotatedElementInfo: " + annotatedElementInfo);
		throw new RuntimeException();
	    }
	} else {
	    // If processing is over without an error, the specified
	    // elements should be empty so an empty set should be returned.
	    resultsMeta = roundEnvironment.getElementsAnnotatedWith(annotatedElementInfoElement);
	    resultsBase = roundEnvironment.getElementsAnnotatedWith(AnnotatedElementInfo.class);
	    if (!resultsMeta.isEmpty())
		throw new RuntimeException("Nonempty resultsMeta: " + resultsMeta);
	    if (!resultsBase.isEmpty())
		throw new RuntimeException("Nonempty resultsBase: " + resultsBase);

	}
        return true;
    }

    private Set<? extends Element> computeResultsBase(RoundEnvironment roundEnvironment, String name) {
	try {
	    return roundEnvironment.
		getElementsAnnotatedWith(Class.forName(name).asSubclass(Annotation.class));
	} catch(ClassNotFoundException cnfe) {
	    throw new RuntimeException(cnfe);
	}
    }
    
    /**
     * Verify non-annotation types result in
     * IllegalArgumentExceptions.
     */
    private void testNonAnnotations(RoundEnvironment roundEnvironment) {
	try {
	    Set<? extends Element> elements = roundEnvironment.getElementsAnnotatedWith((Class)Object.class );
	    throw new RuntimeException("Illegal argument exception not thrown");
	} catch(IllegalArgumentException iae) {}

	try {
	    Set<? extends Element> elements = roundEnvironment.getElementsAnnotatedWith(processingEnv.
											getElementUtils().
											getTypeElement("java.lang.Object") );
	    throw new RuntimeException("Illegal argument exception not thrown");
	} catch(IllegalArgumentException iae) {}
    }

    @Override
    public SourceVersion getSupportedSourceVersion() {
	return SourceVersion.latest();
    }
}