/*

 * Copyright (c) 2012, 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 6206780

 * @summary Test StringBuilder.append(StringBuffer);

 */

import java.util.Random;

public class AppendStringBuffer {

    private static Random generator = new Random();

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

        for (int i=0; i<1000; i++) {

            StringBuffer sb1 = generateTestBuffer(10, 100);

            StringBuffer sb2 = generateTestBuffer(10, 100);

            StringBuffer sb3 = generateTestBuffer(10, 100);

            String s1 = sb1.toString();

            String s2 = sb2.toString();

            String s3 = sb3.toString();

            String concatResult = new String(s1+s2+s3);

            StringBuilder test = new StringBuilder();

            test.append(sb1);

            test.append(sb2);

            test.append(sb3);

            if (!test.toString().equals(concatResult))

                throw new RuntimeException("StringBuffer.append failure");

        }

    }

    private static int getRandomIndex(int constraint1, int constraint2) {

        int range = constraint2 - constraint1;

        int x = generator.nextInt(range);

        return constraint1 + x;

    }

    private static StringBuffer generateTestBuffer(int min, int max) {

        StringBuffer aNewStringBuffer = new StringBuffer(120);

        int aNewLength = getRandomIndex(min, max);

        for(int y=0; y<aNewLength; y++) {

            int achar = generator.nextInt(30)+30;

            char test = (char)(achar);

            aNewStringBuffer.append(test);

        }

        return aNewStringBuffer;

    }

}