/*

 * Copyright (c) 2006, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @bug 6473148

 * @summary TreePath.iterator() throws NPE

 */

import java.io.*;

import java.util.Arrays;

import java.util.Iterator;

import java.util.Set;

import javax.annotation.processing.*;

import javax.lang.model.SourceVersion;

import javax.lang.model.element.Element;

import javax.lang.model.element.TypeElement;

import javax.lang.model.util.ElementFilter;

import javax.tools.JavaCompiler;

import javax.tools.JavaFileObject;

import javax.tools.StandardJavaFileManager;

import javax.tools.ToolProvider;

import com.sun.source.tree.Tree;

import com.sun.source.util.*;

@SupportedAnnotationTypes("*")

public class TestTreePath extends AbstractProcessor {

    @Override

    public boolean process(Set<? extends TypeElement> annotations,

            RoundEnvironment roundEnv) {

        final Trees trees = Trees.instance(this.processingEnv);

        for (Element element : ElementFilter.typesIn(roundEnv.getRootElements())) {

            checkTreePath(trees, element, 2);

            for (Element member : element.getEnclosedElements())

                checkTreePath(trees, member, 3);

        }

        return true;

    }

    private void checkTreePath(Trees trees, Element element, int expectedLength) {

        TreePath path = trees.getPath(element);

        assert path != null;

        int enhancedLength = 0;

        for (Tree tree : path)

            ++enhancedLength;

        if (enhancedLength != expectedLength)

            throw new RuntimeException("found path length is wrong");

        int normalLoopLength = 0;

        Iterator<Tree> iter = path.iterator();

        while (iter.hasNext()) {

          iter.next();

          ++normalLoopLength;

        }

        if (normalLoopLength != expectedLength)

            throw new RuntimeException("found path length is wrong");

        TreePath curr = path;

        // using getParent

        int whileLoopLength = 0;

        while (curr != null) {

          ++whileLoopLength;

          curr = curr.getParentPath();

        }

        if (whileLoopLength != expectedLength)

            throw new RuntimeException("found path length is wrong");

    }

    @Override

    public SourceVersion getSupportedSourceVersion() {

        return SourceVersion.latest();

    }

    File writeTestFile() throws IOException {

        File f = new File("Test.java");

        PrintWriter out = new PrintWriter(new FileWriter(f));

        out.println("class Test { void method() { } }");

        out.close();

        return f;

    }

    public void run() throws IOException {

        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();

        StandardJavaFileManager fileManager

            = compiler.getStandardFileManager(null, null, null);

        Iterable<? extends JavaFileObject> tests

            = fileManager.getJavaFileObjects(writeTestFile());

        JavaCompiler.CompilationTask task =

            ToolProvider.getSystemJavaCompiler().getTask(

                    null, null, null,

                    Arrays.asList("-processor", this.getClass().getName()), null,

                    tests);

        task.call();

    }

    public static void main(String[] args) throws IOException {

        new TestTreePath().run();

    }

}