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 package org.apache.myfaces.trinidad.webapp;
20
21 import java.util.ArrayList;
22 import java.util.HashSet;
23 import java.util.List;
24 import java.util.Set;
25
26
27 final class TagUtils
28 {
29 private TagUtils() {}
30
31
32 /**
33 * Parses a whitespace separated series of name tokens.
34 * @param o the full string
35 * @return an array of each constituent value, or null
36 * if there are no tokens (that is, the string is empty or
37 * all whitespace)
38 * @todo Move to utility function somewhere (ADF Share?)
39 */
40 @SuppressWarnings("oracle.jdeveloper.java.null-array-return")
41 static final String[] parseNameTokens(Object o)
42 {
43 List<String> list = parseNameTokensAsList(o);
44
45 if (list == null)
46 return null;
47
48 return list.toArray(new String[list.size()]);
49 }
50
51 @SuppressWarnings("oracle.jdeveloper.java.null-collection-return")
52 static final List<String> parseNameTokensAsList(Object o)
53 {
54 if (o == null)
55 return null;
56
57 String stringValue = o.toString();
58 ArrayList<String> list = new ArrayList<String>(5);
59
60 int length = stringValue.length();
61 boolean inSpace = true;
62 int start = 0;
63 for (int i = 0; i < length; i++)
64 {
65 char ch = stringValue.charAt(i);
66
67 // We're in whitespace; if we've just departed
68 // a run of non-whitespace, append a string.
69 // Now, why do we use the supposedly deprecated "Character.isSpace()"
70 // function instead of "isWhitespace"? We're following XML rules
71 // here for the meaning of whitespace, which specifically
72 // EXCLUDES general Unicode spaces.
73 if (Character.isWhitespace(ch))
74 {
75 if (!inSpace)
76 {
77 list.add(stringValue.substring(start, i));
78 inSpace = true;
79 }
80 }
81 // We're out of whitespace; if we've just departed
82 // a run of whitespace, start keeping track of this string
83 else
84 {
85 if (inSpace)
86 {
87 start = i;
88 inSpace = false;
89 }
90 }
91 }
92
93 if (!inSpace)
94 list.add(stringValue.substring(start));
95
96 if (list.isEmpty())
97 return null;
98
99 return list;
100 }
101
102 @SuppressWarnings("oracle.jdeveloper.java.null-collection-return")
103 static final Set<String> parseNameTokensAsSet (Object o)
104 {
105 List<String> list = parseNameTokensAsList(o);
106
107 if (list == null)
108 return null;
109 else
110 return new HashSet<String>(list);
111 }
112 }