/*

 * Copyright (c) 2013, 2015, 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

 *

 * 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 8011181

 * @summary javac, empty UTF8 entry generated for inner class

 * @modules jdk.jdeps/com.sun.tools.classfile

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

 */

import java.io.BufferedInputStream;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import com.sun.tools.javac.util.Assert;

import com.sun.tools.classfile.ClassFile;

import static com.sun.tools.classfile.ConstantPool.CONSTANT_Utf8;

import static com.sun.tools.classfile.ConstantPool.CONSTANT_Utf8_info;

import static com.sun.tools.classfile.ConstantPool.CPInfo;

public class EmptyUTF8ForInnerClassNameTest {

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

        new EmptyUTF8ForInnerClassNameTest().run();

    }

    void run() throws Exception {

        checkClassFile(Paths.get(System.getProperty("test.classes"),

                this.getClass().getName() + "$1.class"));

        checkClassFile(Paths.get(System.getProperty("test.classes"),

                this.getClass().getName() + "$EnumPlusSwitch.class"));

    }

    void checkClassFile(final Path path) throws Exception {

        ClassFile classFile = ClassFile.read(

                new BufferedInputStream(Files.newInputStream(path)));

        for (CPInfo cpInfo : classFile.constant_pool.entries()) {

            if (cpInfo.getTag() == CONSTANT_Utf8) {

                CONSTANT_Utf8_info utf8Info = (CONSTANT_Utf8_info)cpInfo;

                Assert.check(utf8Info.value.length() > 0,

                        "UTF8 with length 0 found at class " + classFile.getName());

            }

        }

    }

    static class EnumPlusSwitch {

        enum E {E1}

        public int m (E e) {

            switch (e) {

                case E1:

                    return 0;

            }

            return -1;

        }

    }

}