/*

 * Copyright (c) 1998, 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 4120694

 * @summary Test new methods in StringBuffer

 * @key randomness

 */

import java.lang.*;

import java.util.*;

public class SBBasher {

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

        SBBasher basher = new SBBasher();

        for (int iterations=0; iterations<100; iterations++) {

            String testString = basher.generateTestString();

            boolean result = basher.Test1(testString);

            if (result == false)

                throw new RuntimeException("Substring or replace failure.");

        }

        for (int iterations=0; iterations<100; iterations++) {

            String testString = basher.generateTestString();

            boolean result = basher.Test2(testString);

            if (result == false)

                throw new RuntimeException("Insert or delete failure.");

        }

        for (int iterations=0; iterations<100; iterations++) {

            String testString = basher.generateTestString();

            boolean result = basher.Test3(testString);

            if (result == false)

              throw new RuntimeException("Insert, delete or replace failure.");

        }

    }

    private int getRandomIndex(int constraint1, int constraint2) {

        int range = constraint2 - constraint1;

        int x = generator.nextInt();

        return constraint1 + Math.abs(x % range);

    }

    static Random generator = new Random();

    private String generateTestString() {

        StringBuffer aNewString = new StringBuffer(120);

        int aNewLength = getRandomIndex(1,100);

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

            int achar = generator.nextInt();

            char test = (char)(achar);

            aNewString.append(test);

        }

        return aNewString.toString();

    }

    /**

     * first test, get substring of a random string

     * and replace same spot with same substring

     * then check for equality with original

     * this tests both substrings and the replace method

     */

    private boolean Test1(String before) {

        StringBuffer bashed = new StringBuffer(before);

        String slice;

        for (int i=0; i<100; i++) {

            int startIndex = getRandomIndex(0, before.length());

            int endIndex = getRandomIndex(startIndex, before.length());

            if (endIndex < bashed.length()) {

                slice = bashed.substring(startIndex, endIndex);

            }

            else {

                slice = bashed.substring(startIndex);

            }

            bashed.replace(startIndex, endIndex, slice);

        }

        String after = bashed.toString();

        if (!before.equals(after))

            return false;

        else

            return true;

    }

    /**

     * second test, delete random section of string

     * then insert same section back again

     * then check for equality with original

     * this tests both substrings, both deletes and insert method

     */

    private boolean Test2(String before) {

        StringBuffer bashed = new StringBuffer(before);

        String slice;

        for (int i=0; i<100; i++) {

            int startIndex = getRandomIndex(0, before.length());

            int endIndex = getRandomIndex(startIndex, before.length());

            if (endIndex < bashed.length())

                slice = bashed.substring(startIndex, endIndex);

            else

                slice = bashed.substring(startIndex);

            if (slice.length() == 1)

                bashed.deleteCharAt(startIndex);

            else

                bashed.delete(startIndex, endIndex);

            bashed.insert(startIndex, slice.toCharArray(), 0, slice.length());

        }

        String after = bashed.toString();

        if (!before.equals(after))

            return false;

        else

            return true;

    }

    /**

     * Third test, clone string and make sure that the

     * replace operation is equivalent to a delete followed

     * by an insert with the equivalent arguments

     * this tests replace, delete and insert

     */

    private boolean Test3(String before) {

        StringBuffer bashed1 = new StringBuffer(before);

        StringBuffer bashed2 = new StringBuffer(before);

        int startIndex = getRandomIndex(0, bashed1.length());

        int endIndex = getRandomIndex(startIndex, bashed2.length());

        String insertString = generateTestString();

        bashed1.delete(startIndex, endIndex);

        bashed1.insert(startIndex, insertString);

        bashed2.replace(startIndex, endIndex, insertString);

        String result1 = bashed1.toString();

        String result2 = bashed2.toString();

        if (!result1.equals(result2))

            return false;

        else

            return true;

    }

}