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 
26 package com.sun.tools.javac.util;
27 
28 import java.util.Locale;
29 import java.util.regex.Matcher;
30 import 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  */
39 public 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      */
toLowerCase(String source)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      */
toUpperCase(String source)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      */
indexOfIgnoreCase(String text, String str)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      */
indexOfIgnoreCase(String text, String str, int startIndex)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