1/*
2 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24/**
25 * @test
26 * @bug 6955504 6992121
27 * @summary Test the StringBuilder.ensureCapacity() with negative minimumCapacity
28 *    and append() method with negative length input argument.
29 *    Also, test the StringBuffer class.
30 */
31
32import java.util.ArrayList;
33import java.util.Vector;
34
35public class EnsureCapacity {
36    public static void main(String[] args) {
37        testStringBuilder();
38        testStringBuffer();
39    }
40
41    private static void checkCapacity(int before, int after) {
42        if (before != after) {
43            throw new RuntimeException("capacity is expected to be unchanged: " +
44                "before=" + before + " after=" + after);
45        }
46    }
47
48    private static void testStringBuilder() {
49        StringBuilder sb = new StringBuilder("abc");
50        int cap = sb.capacity();
51
52        // test if negative minimumCapacity
53        sb.ensureCapacity(Integer.MIN_VALUE);
54        checkCapacity(cap, sb.capacity());
55
56        try {
57            char[] str = {'a', 'b', 'c', 'd'};
58            // test if negative length
59            sb.append(str, 0, Integer.MIN_VALUE + 10);
60            throw new RuntimeException("IndexOutOfBoundsException not thrown");
61        } catch (IndexOutOfBoundsException ex) {
62        }
63    }
64
65    private static void testStringBuffer() {
66        StringBuffer sb = new StringBuffer("abc");
67        int cap = sb.capacity();
68
69        // test if negative minimumCapacity
70        sb.ensureCapacity(Integer.MIN_VALUE);
71        checkCapacity(cap, sb.capacity());
72
73        try {
74            char[] str = {'a', 'b', 'c', 'd'};
75            // test if negative length
76            sb.append(str, 0, Integer.MIN_VALUE + 10);
77            throw new RuntimeException("IndexOutOfBoundsException not thrown");
78        } catch (IndexOutOfBoundsException ex) {
79        }
80    }
81}
82