/*

 * Copyright 2010 Google Inc.  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 6952330

 * @summary Test StringBuffer/StringBuilder capacity handling.

 * @key randomness

 */

import java.util.Random;

public class Capacity {

    void test(String[] args) throws Throwable {

        Random rnd = new Random();

        int[] sizes = { 0, 1, rnd.nextInt(10), rnd.nextInt(1000) };

        for (int size : sizes) {

            equal(16, new StringBuffer().capacity());

            equal(16, new StringBuilder().capacity());

            StringBuffer buff = new StringBuffer(size);

            StringBuilder bild = new StringBuilder(size);

            equal(size, buff.capacity());

            equal(size, bild.capacity());

            buff.ensureCapacity(size);

            bild.ensureCapacity(size);

            equal(size, buff.capacity());

            equal(size, bild.capacity());

            buff.ensureCapacity(size+1);

            bild.ensureCapacity(size+1);

            equal(size*2+2, buff.capacity());

            equal(size*2+2, bild.capacity());

            size = buff.capacity();

            buff.ensureCapacity(size*2+1);

            bild.ensureCapacity(size*2+1);

            equal(size*2+2, buff.capacity());

            equal(size*2+2, bild.capacity());

            size = buff.capacity();

            int newSize = size * 2 + 3;

            buff.ensureCapacity(newSize);

            bild.ensureCapacity(newSize);

            equal(newSize, buff.capacity());

            equal(newSize, bild.capacity());

            buff.ensureCapacity(0);

            bild.ensureCapacity(0);

            equal(newSize, buff.capacity());

            equal(newSize, bild.capacity());

        }

    }

    //--------------------- Infrastructure ---------------------------

    volatile int passed = 0, failed = 0;

    void pass() {passed++;}

    void fail() {failed++; Thread.dumpStack();}

    void fail(String msg) {System.err.println(msg); fail();}

    void unexpected(Throwable t) {failed++; t.printStackTrace();}

    void check(boolean cond) {if (cond) pass(); else fail();}

    void equal(Object x, Object y) {

        if (x == null ? y == null : x.equals(y)) pass();

        else fail(x + " not equal to " + y);}

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

        new Capacity().instanceMain(args);}

    public void instanceMain(String[] args) throws Throwable {

        try {test(args);} catch (Throwable t) {unexpected(t);}

        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);

        if (failed > 0) throw new AssertionError("Some tests failed");}

}