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Java > Open Source Codes > org > jboss > xb > binding > sunday > unmarshalling > DefaultElementHandler


1 /*
2   * JBoss, Home of Professional Open Source
3   * Copyright 2005, JBoss Inc., and individual contributors as indicated
4   * by the @authors tag. See the copyright.txt in the distribution for a
5   * full listing of individual contributors.
6   *
7   * This is free software; you can redistribute it and/or modify it
8   * under the terms of the GNU Lesser General Public License as
9   * published by the Free Software Foundation; either version 2.1 of
10   * the License, or (at your option) any later version.
11   *
12   * This software is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   * Lesser General Public License for more details.
16   *
17   * You should have received a copy of the GNU Lesser General Public
18   * License along with this software; if not, write to the Free
19   * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20   * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21   */
22 package org.jboss.xb.binding.sunday.unmarshalling;
23
24 import javax.xml.namespace.QName JavaDoc;
25 import javax.xml.namespace.NamespaceContext JavaDoc;
26
27 import org.jboss.logging.Logger;
28 import org.xml.sax.Attributes JavaDoc;
29
30 /**
31  * This handler can only be used if model group binding is not used.
32  *
33  * @author <a HREF="mailto:alex@jboss.org">Alexey Loubyansky</a>
34  * @version <tt>$Revision: 1958 $</tt>
35  */
36 public class DefaultElementHandler
37    implements ElementHandler, ParticleHandler
38 {
39    /** The log */
40    private static final Logger log = Logger.getLogger(DefaultElementHandler.class);
41    
42    public static final DefaultElementHandler INSTANCE = new DefaultElementHandler();
43
44    private AttributesHandler attrsHandler;
45
46    public DefaultElementHandler()
47    {
48       this(AttributesHandler.INSTANCE);
49    }
50
51    public DefaultElementHandler(AttributesHandler attrsHandler)
52    {
53       this.attrsHandler = attrsHandler;
54    }
55
56    public Object JavaDoc startElement(Object JavaDoc parent, QName JavaDoc qName, ElementBinding element)
57    {
58       return parent;
59    }
60
61    public void attributes(Object JavaDoc o, QName JavaDoc elementName, ElementBinding element, Attributes JavaDoc attrs, NamespaceContext JavaDoc nsCtx)
62    {
63       if(attrsHandler != null)
64       {
65          attrsHandler.attributes(o, elementName, element.getType(), attrs, nsCtx);
66       }
67    }
68
69    public Object JavaDoc endElement(Object JavaDoc o, QName JavaDoc qName, ElementBinding element)
70    {
71       return o;
72    }
73
74    public void setParent(Object JavaDoc parent, Object JavaDoc o, QName JavaDoc qName, ElementBinding element, ElementBinding parentElement)
75    {
76       if (log.isTraceEnabled())
77          log.trace("Not setting " + o + " on " + parent + " for " + qName);
78    }
79
80    // ParticleHandler impl
81
82    public Object JavaDoc startParticle(Object JavaDoc parent,
83                                QName JavaDoc elementName,
84                                ParticleBinding particle,
85                                Attributes JavaDoc attrs,
86                                NamespaceContext JavaDoc nsCtx)
87    {
88       ElementBinding element = (ElementBinding)particle.getTerm();
89       Object JavaDoc o = startElement(parent, elementName, element);
90       if(o != null)
91       {
92          attrs = element.getType().expandWithDefaultAttributes(attrs);
93          attributes(o, elementName, element, attrs, nsCtx);
94       }
95       return o;
96    }
97
98    public Object JavaDoc endParticle(Object JavaDoc o, QName JavaDoc elementName, ParticleBinding particle)
99    {
100       return endElement(o, elementName, (ElementBinding)particle.getTerm());
101    }
102
103    public void setParent(Object JavaDoc parent,
104                          Object JavaDoc o,
105                          QName JavaDoc elementName,
106                          ParticleBinding particle,
107                          ParticleBinding parentParticle)
108    {
109       ElementBinding element = (ElementBinding)particle.getTerm();
110       ElementBinding parentElement = (ElementBinding)parentParticle.getTerm();
111       setParent(parent, o, elementName, element, parentElement);
112    }
113 }
114
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