1 /**
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19
20 package org.apache.ws.security.util;
21
22 import java.util.ArrayList;
23 import java.util.List;
24
25 public final class StringUtil {
26
27 private StringUtil() {
28 // Complete
29 }
30
31 /**
32 * Tests if this string starts with the specified prefix (Ignoring whitespaces)
33 *
34 * @param prefix
35 * @param string
36 * @return boolean
37 */
38 public static boolean startsWithIgnoreWhitespaces(String prefix, String string) {
39 int index1 = 0;
40 int index2 = 0;
41 int length1 = prefix.length();
42 int length2 = string.length();
43 char ch1 = ' ';
44 char ch2 = ' ';
45 while (index1 < length1 && index2 < length2) {
46 while (index1 < length1 && Character.isWhitespace(ch1 = prefix.charAt(index1))) {
47 index1++;
48 }
49 while (index2 < length2 && Character.isWhitespace(ch2 = string.charAt(index2))) {
50 index2++;
51 }
52 if (index1 == length1 && index2 == length2) {
53 return true;
54 }
55 if (ch1 != ch2) {
56 return false;
57 }
58 index1++;
59 index2++;
60 }
61 if (index1 < length1 && index2 >= length2) {
62 return false;
63 }
64 return true;
65 }
66
67 /**
68 * <p>Splits the provided text into an array, separator specified.
69 * This is an alternative to using StringTokenizer.</p>
70 * <p/>
71 * <p>The separator is not included in the returned String array.
72 * Adjacent separators are treated as one separator.</p>
73 * <p/>
74 * <p>A <code>null</code> input String returns <code>null</code>.</p>
75 * <p/>
76 * <pre>
77 * StringUtils.split(null, *) = null
78 * StringUtils.split("", *) = []
79 * StringUtils.split("a.b.c", '.') = ["a", "b", "c"]
80 * StringUtils.split("a..b.c", '.') = ["a", "b", "c"]
81 * StringUtils.split("a:b:c", '.') = ["a:b:c"]
82 * StringUtils.split("a\tb\nc", null) = ["a", "b", "c"]
83 * StringUtils.split("a b c", ' ') = ["a", "b", "c"]
84 * </pre>
85 *
86 * @param str the String to parse, may be null
87 * @param separatorChar the character used as the delimiter,
88 * <code>null</code> splits on whitespace
89 * @return an array of parsed Strings, <code>null</code> if null String input
90 */
91 public static String[] split(String str, char separatorChar) {
92 if (str == null) {
93 return null;
94 }
95 int len = str.length();
96 if (len == 0) {
97 return new String[0];
98 }
99 List<String> list = new ArrayList<String>();
100 int i = 0, start = 0;
101 boolean match = false;
102 while (i < len) {
103 if (str.charAt(i) == separatorChar) {
104 if (match) {
105 list.add(str.substring(start, i));
106 match = false;
107 }
108 start = ++i;
109 continue;
110 }
111 match = true;
112 i++;
113 }
114 if (match) {
115 list.add(str.substring(start, i));
116 }
117 return (String[]) list.toArray(new String[list.size()]);
118 }
119 }