/*

 * Copyright (c) 2014, 2016, 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     8040822

 * @summary Check that all TaskEvents are balanced.

 * @modules jdk.compiler/com.sun.tools.javac.api

 *          jdk.compiler/com.sun.tools.javac.comp

 *          jdk.compiler/com.sun.tools.javac.file

 */

import java.io.*;

import java.net.URI;

import java.util.*;

import java.util.Map.Entry;

import javax.tools.*;

import com.sun.source.util.*;

import com.sun.source.util.TaskEvent.Kind;

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

import com.sun.tools.javac.comp.CompileStates.CompileState;

public class EventsBalancedTest {

    JavacTool tool = (JavacTool) ToolProvider.getSystemJavaCompiler();

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

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

        EventsBalancedTest t = new EventsBalancedTest();

        try {

            t.test();

        } finally {

            t.fm.close();

        }

    }

    void test() throws IOException {

        TestSource a = new TestSource("B", "class B extends A { }");

        TestSource b = new TestSource("A", "abstract class A { }");

        test(null, Arrays.asList(a, b));

        test(null, Arrays.asList(b, a));

        for (CompileState stop : CompileState.values()) {

                 Arrays.asList(a, b));

                 Arrays.asList(b, a));

        }

    }

    void test(List<String> options, List<JavaFileObject> files) throws IOException {

        System.err.println("testing: " + options + ", " + files);

        TestListener listener = new TestListener();

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

        task.setTaskListener(listener);

        task.call();

        for (Entry<Kind, Integer> e : listener.kind2Count.entrySet()) {

            if (e.getValue() != null && e.getValue() != 0) {

                throw new IllegalStateException("Not balanced event: " + e.getKey());

            }

        }

    }

    static class TestListener implements TaskListener {

        final Map<Kind, Integer> kind2Count = new HashMap<>();

        int get(Kind k) {

            Integer count = kind2Count.get(k);

            if (count == null)

                kind2Count.put(k, count = 0);

            return count;

        }

        @Override

        public void started(TaskEvent e) {

            kind2Count.put(e.getKind(), get(e.getKind()) + 1);

        }

        @Override

        public void finished(TaskEvent e) {

            int count = get(e.getKind());

            if (count <= 0)

                throw new IllegalStateException("count<=0 for: " + e.getKind());

            kind2Count.put(e.getKind(), count - 1);

        }

    }

    static class TestSource extends SimpleJavaFileObject {

        final String content;

        public TestSource(String fileName, String content) {

            super(URI.create("myfo:/" + fileName + ".java"), JavaFileObject.Kind.SOURCE);

            this.content = content;

        }

        @Override

        public CharSequence getCharContent(boolean ignoreEncodingErrors) {

            return content;

        }

    }

}