1/*
2 * Copyright (c) 2013, 2014, 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.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package com.sun.tools.javac.util;
27
28import java.util.Locale;
29import java.util.regex.Matcher;
30import java.util.regex.Pattern;
31
32/** A collection of utilities for String manipulation.
33 *
34 *  <p><b>This is NOT part of any supported API.
35 *  If you write code that depends on this, you do so at your own risk.
36 *  This code and its internal interfaces are subject to change or
37 *  deletion without notice.</b>
38 */
39public class StringUtils {
40
41    /**Converts the given String to lower case using the {@link Locale#US US Locale}. The result
42     * is independent of the default Locale in the current JVM instance.
43     */
44    public static String toLowerCase(String source) {
45        return source.toLowerCase(Locale.US);
46    }
47
48    /**Converts the given String to upper case using the {@link Locale#US US Locale}. The result
49     * is independent of the default Locale in the current JVM instance.
50     */
51    public static String toUpperCase(String source) {
52        return source.toUpperCase(Locale.US);
53    }
54
55    /**Case insensitive version of {@link String#indexOf(java.lang.String)}. Equivalent to
56     * {@code text.indexOf(str)}, except the matching is case insensitive.
57     */
58    public static int indexOfIgnoreCase(String text, String str) {
59        return indexOfIgnoreCase(text, str, 0);
60    }
61
62    /**Case insensitive version of {@link String#indexOf(java.lang.String, int)}. Equivalent to
63     * {@code text.indexOf(str, startIndex)}, except the matching is case insensitive.
64     */
65    public static int indexOfIgnoreCase(String text, String str, int startIndex) {
66        Matcher m = Pattern.compile(Pattern.quote(str), Pattern.CASE_INSENSITIVE).matcher(text);
67        return m.find(startIndex) ? m.start() : -1;
68    }
69
70}
71