1 /*
2  * Copyright (c) 2010, 2011, 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
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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
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19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24  */
25 
26 /*
27  *******************************************************************************
28  * Copyright (C) 2009, International Business Machines Corporation and         *
29  * others. All Rights Reserved.                                                *
30  *******************************************************************************
31  */
32 package sun.util.locale;
33 
34 import java.util.List;
35 import java.util.Map;
36 import java.util.Set;
37 
38 /**
39  * Collection of static utility methods for Locale support. The
40  * methods which manipulate characters or strings support ASCII only.
41  */
42 public final class LocaleUtils {
43 
LocaleUtils()44     private LocaleUtils() {
45     }
46 
47     /**
48      * Compares two ASCII Strings s1 and s2, ignoring case.
49      */
caseIgnoreMatch(String s1, String s2)50     public static boolean caseIgnoreMatch(String s1, String s2) {
51         if (s1 == s2) {
52             return true;
53         }
54 
55         int len = s1.length();
56         if (len != s2.length()) {
57             return false;
58         }
59 
60         for (int i = 0; i < len; i++) {
61             char c1 = s1.charAt(i);
62             char c2 = s2.charAt(i);
63             if (c1 != c2 && toLower(c1) != toLower(c2)) {
64                 return false;
65             }
66         }
67         return true;
68     }
69 
caseIgnoreCompare(String s1, String s2)70     static int caseIgnoreCompare(String s1, String s2) {
71         if (s1 == s2) {
72             return 0;
73         }
74         return toLowerString(s1).compareTo(toLowerString(s2));
75     }
76 
toUpper(char c)77     static char toUpper(char c) {
78         return isLower(c) ? (char)(c - 0x20) : c;
79     }
80 
toLower(char c)81     static char toLower(char c) {
82         return isUpper(c) ? (char)(c + 0x20) : c;
83     }
84 
85     /**
86      * Converts the given ASCII String to lower-case.
87      */
toLowerString(String s)88     public static String toLowerString(String s) {
89         int len = s.length();
90         int idx = 0;
91         for (; idx < len; idx++) {
92             if (isUpper(s.charAt(idx))) {
93                 break;
94             }
95         }
96         if (idx == len) {
97             return s;
98         }
99 
100         char[] buf = new char[len];
101         for (int i = 0; i < len; i++) {
102             char c = s.charAt(i);
103             buf[i] = (i < idx) ? c : toLower(c);
104         }
105         return new String(buf);
106     }
107 
toUpperString(String s)108     static String toUpperString(String s) {
109         int len = s.length();
110         int idx = 0;
111         for (; idx < len; idx++) {
112             if (isLower(s.charAt(idx))) {
113                 break;
114             }
115         }
116         if (idx == len) {
117             return s;
118         }
119 
120         char[] buf = new char[len];
121         for (int i = 0; i < len; i++) {
122             char c = s.charAt(i);
123             buf[i] = (i < idx) ? c : toUpper(c);
124         }
125         return new String(buf);
126     }
127 
toTitleString(String s)128     static String toTitleString(String s) {
129         int len;
130         if ((len = s.length()) == 0) {
131             return s;
132         }
133         int idx = 0;
134         if (!isLower(s.charAt(idx))) {
135             for (idx = 1; idx < len; idx++) {
136                 if (isUpper(s.charAt(idx))) {
137                     break;
138                 }
139             }
140         }
141         if (idx == len) {
142             return s;
143         }
144 
145         char[] buf = new char[len];
146         for (int i = 0; i < len; i++) {
147             char c = s.charAt(i);
148             if (i == 0 && idx == 0) {
149                 buf[i] = toUpper(c);
150             } else if (i < idx) {
151                 buf[i] = c;
152             } else {
153                 buf[i] = toLower(c);
154             }
155         }
156         return new String(buf);
157     }
158 
isUpper(char c)159     private static boolean isUpper(char c) {
160         return c >= 'A' && c <= 'Z';
161     }
162 
isLower(char c)163     private static boolean isLower(char c) {
164         return c >= 'a' && c <= 'z';
165     }
166 
isAlpha(char c)167     static boolean isAlpha(char c) {
168         return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
169     }
170 
isAlphaString(String s)171     static boolean isAlphaString(String s) {
172         int len = s.length();
173         for (int i = 0; i < len; i++) {
174             if (!isAlpha(s.charAt(i))) {
175                 return false;
176             }
177         }
178         return true;
179     }
180 
isNumeric(char c)181     static boolean isNumeric(char c) {
182         return (c >= '0' && c <= '9');
183     }
184 
isNumericString(String s)185     static boolean isNumericString(String s) {
186         int len = s.length();
187         for (int i = 0; i < len; i++) {
188             if (!isNumeric(s.charAt(i))) {
189                 return false;
190             }
191         }
192         return true;
193     }
194 
isAlphaNumeric(char c)195     static boolean isAlphaNumeric(char c) {
196         return isAlpha(c) || isNumeric(c);
197     }
198 
isAlphaNumericString(String s)199     public static boolean isAlphaNumericString(String s) {
200         int len = s.length();
201         for (int i = 0; i < len; i++) {
202             if (!isAlphaNumeric(s.charAt(i))) {
203                 return false;
204             }
205         }
206         return true;
207     }
208 
isEmpty(String str)209     static boolean isEmpty(String str) {
210         return str == null || str.length() == 0;
211     }
212 
isEmpty(Set<?> set)213     static boolean isEmpty(Set<?> set) {
214         return set == null || set.isEmpty();
215     }
216 
isEmpty(Map<?, ?> map)217     static boolean isEmpty(Map<?, ?> map) {
218         return map == null || map.isEmpty();
219     }
220 
isEmpty(List<?> list)221     static boolean isEmpty(List<?> list) {
222         return list == null || list.isEmpty();
223     }
224 }
225