1 /**
2 * Licensed under the Artistic License; you may not use this file
3 * except in compliance with the License.
4 * You may obtain a copy of the License at
5 *
6 * http://displaytag.sourceforge.net/license.html
7 *
8 * THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR
9 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
10 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
11 */
12 package org.displaytag.util;
13
14 import java.util.Iterator;
15 import java.util.LinkedHashSet;
16 import java.util.Set;
17
18 import org.apache.commons.lang.StringUtils;
19 import org.apache.commons.lang.UnhandledException;
20
21
22 /**
23 * Object used to contain html multiple attribute value (for the "class" attribute).
24 * @author Fabrizio Giustina
25 * @version $Revision: 1081 $ ($Author: fgiust $)
26 */
27 public class MultipleHtmlAttribute implements Cloneable
28 {
29
30 /**
31 * Sets containing splitted attribute values.
32 */
33 private Set attributeSet;
34
35 /**
36 * Constructor for MultipleHtmlAttribute.
37 * @param attributeValue String
38 */
39 public MultipleHtmlAttribute(String attributeValue)
40 {
41 this.attributeSet = new LinkedHashSet();
42 addAllAttributesFromArray(StringUtils.split(attributeValue));
43 }
44
45 /**
46 * Adds attributes from an array.
47 * @param attributes Object[] Array containing attributes
48 */
49 private void addAllAttributesFromArray(String[] attributes)
50 {
51 if (attributes == null)
52 {
53 return;
54 }
55
56 // number of attributes to add
57 int length = attributes.length;
58
59 // add all the splitted attributes
60 for (int j = 0; j < length; j++)
61 {
62
63 // don't add if empty
64 if (!StringUtils.isEmpty(attributes[j]))
65 {
66 this.attributeSet.add(attributes[j]);
67 }
68
69 }
70 }
71
72 /**
73 * Returns the list of attributes separated by a space.
74 * @return String
75 */
76 public String toString()
77 {
78 StringBuffer buffer = new StringBuffer();
79
80 Iterator iterator = this.attributeSet.iterator();
81
82 while (iterator.hasNext())
83 {
84 // apend next value
85 buffer.append(iterator.next());
86 if (iterator.hasNext())
87 {
88 // append a space if there are more
89 buffer.append(' ');
90 }
91 }
92
93 return buffer.toString();
94 }
95
96 /**
97 * Adds a value to the attribute.
98 * @param attributeValue value to add to the attribute
99 */
100 public void addAttributeValue(String attributeValue)
101 {
102 // don't add if empty
103 if (!StringUtils.isEmpty(attributeValue))
104 {
105 this.attributeSet.add(attributeValue);
106 }
107
108 }
109
110 /**
111 * Return true if this MultipleHtmlValue doesn't store any value.
112 * @return <code>true</code> if this MultipleHtmlValue doesn't store any value
113 */
114 public boolean isEmpty()
115 {
116 return attributeSet.isEmpty();
117 }
118
119 /**
120 * @see java.lang.Object#clone()
121 */
122 protected Object clone()
123 {
124 MultipleHtmlAttribute clone;
125
126 try
127 {
128 clone = (MultipleHtmlAttribute) super.clone();
129 }
130 catch (CloneNotSupportedException e)
131 {
132 // should never happen
133 throw new UnhandledException(e);
134 }
135
136 // copy attributes
137 clone.addAllAttributesFromArray((String[]) this.attributeSet.toArray(new String[this.attributeSet.size()]));
138
139 return clone;
140 }
141
142 }
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