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Java > Open Source Codes > org > dom4j > bean > BeanAttributeList


1 /*
2  * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
3  *
4  * This software is open source.
5  * See the bottom of this file for the licence.
6  */

7
8 package org.dom4j.bean;
9
10 import java.util.AbstractList JavaDoc;
11
12 import org.dom4j.Attribute;
13 import org.dom4j.QName;
14
15 /**
16  * <p>
17  * <code>BeanAttributeList</code> implements a list of Attributes which are
18  * the properties of a JavaBean.
19  * </p>
20  *
21  * @author <a HREF="mailto:james.strachan@metastuff.com">James Strachan </a>
22  * @version $Revision: 1.9 $
23  */

24 public class BeanAttributeList extends AbstractList JavaDoc {
25     /** The BeanElement that this */
26     private BeanElement parent;
27
28     /** The BeanElement that this */
29     private BeanMetaData beanMetaData;
30
31     /** The attributes */
32     private BeanAttribute[] attributes;
33
34     public BeanAttributeList(BeanElement parent, BeanMetaData beanMetaData) {
35         this.parent = parent;
36         this.beanMetaData = beanMetaData;
37         this.attributes = new BeanAttribute[beanMetaData.attributeCount()];
38     }
39
40     public BeanAttributeList(BeanElement parent) {
41         this.parent = parent;
42
43         Object JavaDoc data = parent.getData();
44         Class JavaDoc beanClass = (data != null) ? data.getClass() : null;
45         this.beanMetaData = BeanMetaData.get(beanClass);
46         this.attributes = new BeanAttribute[beanMetaData.attributeCount()];
47     }
48
49     public Attribute attribute(String JavaDoc name) {
50         int index = beanMetaData.getIndex(name);
51
52         return attribute(index);
53     }
54
55     public Attribute attribute(QName qname) {
56         int index = beanMetaData.getIndex(qname);
57
58         return attribute(index);
59     }
60
61     public BeanAttribute attribute(int index) {
62         if ((index >= 0) && (index <= attributes.length)) {
63             BeanAttribute attribute = attributes[index];
64
65             if (attribute == null) {
66                 attribute = createAttribute(parent, index);
67                 attributes[index] = attribute;
68             }
69
70             return attribute;
71         }
72
73         return null;
74     }
75
76     public BeanElement getParent() {
77         return parent;
78     }
79
80     public QName getQName(int index) {
81         return beanMetaData.getQName(index);
82     }
83
84     public Object JavaDoc getData(int index) {
85         return beanMetaData.getData(index, parent.getData());
86     }
87
88     public void setData(int index, Object JavaDoc data) {
89         beanMetaData.setData(index, parent.getData(), data);
90     }
91
92     // List interface
93
// -------------------------------------------------------------------------
94
public int size() {
95         return attributes.length;
96     }
97
98     public Object JavaDoc get(int index) {
99         BeanAttribute attribute = attributes[index];
100
101         if (attribute == null) {
102             attribute = createAttribute(parent, index);
103             attributes[index] = attribute;
104         }
105
106         return attribute;
107     }
108
109     public boolean add(Object JavaDoc object) {
110         throw new UnsupportedOperationException JavaDoc("add(Object) unsupported");
111     }
112
113     public void add(int index, Object JavaDoc object) {
114         throw new UnsupportedOperationException JavaDoc("add(int,Object) unsupported");
115     }
116
117     public Object JavaDoc set(int index, Object JavaDoc object) {
118         throw new UnsupportedOperationException JavaDoc("set(int,Object) unsupported");
119     }
120
121     public boolean remove(Object JavaDoc object) {
122         return false;
123     }
124
125     public Object JavaDoc remove(int index) {
126         BeanAttribute attribute = (BeanAttribute) get(index);
127         Object JavaDoc oldValue = attribute.getValue();
128         attribute.setValue(null);
129
130         return oldValue;
131     }
132
133     public void clear() {
134         for (int i = 0, size = attributes.length; i < size; i++) {
135             BeanAttribute attribute = attributes[i];
136
137             if (attribute != null) {
138                 attribute.setValue(null);
139             }
140         }
141     }
142
143     // Implementation methods
144
// -------------------------------------------------------------------------
145
protected BeanAttribute createAttribute(BeanElement element, int index) {
146         return new BeanAttribute(this, index);
147     }
148 }
149
150 /*
151  * Redistribution and use of this software and associated documentation
152  * ("Software"), with or without modification, are permitted provided that the
153  * following conditions are met:
154  *
155  * 1. Redistributions of source code must retain copyright statements and
156  * notices. Redistributions must also contain a copy of this document.
157  *
158  * 2. Redistributions in binary form must reproduce the above copyright notice,
159  * this list of conditions and the following disclaimer in the documentation
160  * and/or other materials provided with the distribution.
161  *
162  * 3. The name "DOM4J" must not be used to endorse or promote products derived
163  * from this Software without prior written permission of MetaStuff, Ltd. For
164  * written permission, please contact dom4j-info@metastuff.com.
165  *
166  * 4. Products derived from this Software may not be called "DOM4J" nor may
167  * "DOM4J" appear in their names without prior written permission of MetaStuff,
168  * Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
169  *
170  * 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
171  *
172  * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND
173  * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
174  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
175  * ARE DISCLAIMED. IN NO EVENT SHALL METASTUFF, LTD. OR ITS CONTRIBUTORS BE
176  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
177  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
178  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
179  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
180  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
181  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
182  * POSSIBILITY OF SUCH DAMAGE.
183  *
184  * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
185  */

186
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