/*

 * Copyright (c) 2006, 2010, 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

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 * questions.

 */

/*

 * @test

 * @bug 6392782

 * @summary TreeScanner.visitImport returns null, not result of nested scan

 */

import java.io.*;

import java.util.*;

import javax.tools.*;

import com.sun.source.tree.*;

import com.sun.source.util.*;

import com.sun.tools.javac.api.*;

public class T6392782 {

    public static void main(String... args) throws IOException {

        String testSrc = System.getProperty("test.src", ".");

        JavacTool tool = JavacTool.create();

        StandardJavaFileManager fm = tool.getStandardFileManager(null, null, null);

        Iterable<? extends JavaFileObject> files =

            fm.getJavaFileObjectsFromFiles(Arrays.asList(new File(testSrc, T6392782.class.getName()+".java")));

        JavacTask task = tool.getTask(null, fm, null, null, null, files);

        Iterable<? extends Tree> trees = task.parse();

        TreeScanner<Integer,Void> scanner = new MyScanner();

        check(scanner, 6, scanner.scan(trees, null));

        CountNodes nodeCounter = new CountNodes();

        // 359 nodes with the regular parser; 360 nodes with EndPosParser

        // We automatically switch to EndPosParser when calling JavacTask.parse()

        check(nodeCounter, 360, nodeCounter.scan(trees, null));

        CountIdentifiers idCounter = new CountIdentifiers();

        check(idCounter, 107, idCounter.scan(trees, null));

    }

    private static void check(TreeScanner<?,?> scanner, int expect, int found) {

        if (found != expect)

            throw new AssertionError(scanner.getClass().getName() + ": expected: " + expect + " found: " + found);

    }

    static class MyScanner extends TreeScanner<Integer,Void> {

        @Override

        public Integer visitImport(ImportTree tree, Void ignore) {

            //System.err.println(tree);

            return 1;

        }

        @Override

        public Integer reduce(Integer i1, Integer i2) {

            return (i1 == null ? 0 : i1) + (i2 == null ? 0 : i2);

        }

    }

    static class CountNodes extends TreeScanner<Integer,Void> {

        @Override

        public Integer scan(Tree node, Void p) {

            if (node == null)

                return 0;

            Integer n = super.scan(node, p);

            return (n == null ? 0 : n) + 1;

        }

        @Override

        public Integer reduce(Integer r1, Integer r2) {

            return (r1 == null ? 0 : r1) + (r2 == null ? 0 : r2);

        }

    }

    // example from TreeScanner javadoc

    static class CountIdentifiers extends TreeScanner<Integer,Void> {

        @Override

        public Integer visitIdentifier(IdentifierTree node, Void p) {

            return 1;

        }

        @Override

        public Integer reduce(Integer r1, Integer r2) {

            return (r1 == null ? 0 : r1) + (r2 == null ? 0 : r2);

        }

    }

}