/*

 * Copyright (c) 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

 * 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 6856817

 * @summary optimize the Writer.append(CharSequence) method

 */

import java.io.File;

import java.io.FileOutputStream;

import java.io.FileReader;

import java.io.IOException;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.nio.ByteBuffer;

import java.nio.CharBuffer;

/**

 *

 * @author vyom.tewari@oacle.com

 */

public class Bug6856817 {

    private static final String str = "This is just a test string that i am using it to test the CharBuffer.append(CharSequence csq)  for little bit performance improvement.";

    private static final int BUF_SIZE = 1024;

    /**

     *

     * @param args

     */

    public static void main(String args[]) {

        CharBuffer charBuffer = CharBuffer.allocate(BUF_SIZE);

        File file = new File("temp.txt");

        file.deleteOnExit();

        charBuffer.put(str);

        charBuffer.flip();

        checkFileContent(charBuffer, file, str);

        charBuffer.position(10);

        checkFileContent(charBuffer, file, str.substring(10));

        charBuffer.position(charBuffer.limit());

        checkFileContent(charBuffer, file, str.substring(charBuffer.limit()));

        char arr[] = new char[BUF_SIZE];

        charBuffer = CharBuffer.wrap(arr);

        charBuffer.put(str);

        charBuffer.flip();

        checkFileContent(charBuffer, file, str);

        charBuffer.position(10);

        checkFileContent(charBuffer, file, str.substring(10));

        charBuffer.position(charBuffer.limit());

        checkFileContent(charBuffer, file, str.substring(charBuffer.limit()));

        char secArr[] = new char[BUF_SIZE];

        charBuffer = CharBuffer.wrap(secArr);

        charBuffer.put(str);

        charBuffer.position(5);

        charBuffer.limit(str.length() - 7);

        charBuffer = charBuffer.slice();

        checkFileContent(charBuffer, file, str.substring(5, (str.length() - 7)));

        charBuffer.position(10);

        checkFileContent(charBuffer, file, str.substring(15, (str.length() - 7)));

        charBuffer.position(charBuffer.limit());

        checkFileContent(charBuffer, file, str.substring(charBuffer.limit()));

        charBuffer = ByteBuffer.allocate(BUF_SIZE).asCharBuffer();

        charBuffer.put(str);

        charBuffer.flip();

        checkFileContent(charBuffer, file, str);

        charBuffer.position(10);

        checkFileContent(charBuffer, file, str.substring(10));

        charBuffer.position(charBuffer.limit());

        checkFileContent(charBuffer, file, str.substring(charBuffer.limit()));

        charBuffer = ByteBuffer.allocateDirect(1024).asCharBuffer();

        charBuffer.put(str);

        charBuffer.flip();

        checkFileContent(charBuffer, file, str);

        charBuffer.position(10);

        checkFileContent(charBuffer, file, str.substring(10));

        charBuffer.position(charBuffer.limit());

        checkFileContent(charBuffer, file, str.substring(charBuffer.limit()));

    }

    private static void checkFileContent(CharBuffer charBuffer, File file, String expectedValue) {

        OutputStreamWriter writer = null;

        FileReader reader = null;

        int position, limit;

        position = charBuffer.position();

        limit = charBuffer.limit();

        try {

            OutputStream outputStream = new FileOutputStream(file);

            writer = new OutputStreamWriter(outputStream);

            writer.append(charBuffer);

            writer.close();

            if (!isEqual(position, charBuffer.position())) {

                System.out.println(": failed");

                throw new RuntimeException("buffer position before write: " + position + " and position after write: " + charBuffer.position());

            }

            if (!isEqual(limit, charBuffer.limit())) {

                System.out.println(": failed");

                throw new RuntimeException("buffer limit before write: " + limit + " and limit after write: " + charBuffer.limit());

            }

            reader = new FileReader(file);

            char arr[] = new char[BUF_SIZE];

            int byteRead = reader.read(arr);

            if (byteRead != -1) {

                String stringRead = new String(arr, 0, byteRead);

                if (expectedValue.equals(stringRead)) {

                    System.out.println(": passed");

                } else {

                    System.out.println(": failed");

                    throw new RuntimeException("expected :" + expectedValue + " and got:" + stringRead);

                }

            }

        } catch (IOException ex) {

            ex.printStackTrace();

            throw new RuntimeException(ex);

        } finally {

            try {

                if (writer != null) {

                    writer.close();

                }

                if (reader != null) {

                    reader.close();

                }

            } catch (IOException ex) {

                throw new RuntimeException(ex);

            }

        }

    }

    private static boolean isEqual(final int first, final int second) {

        return (first == second);

    }

}