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Java > Open Source Codes > org > jfree > xml > parser > coretypes > ObjectRefHandler


1 /* ========================================================================
2  * JCommon : a free general purpose class library for the Java(tm) platform
3  * ========================================================================
4  *
5  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
6  *
7  * Project Info: http://www.jfree.org/jcommon/index.html
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22  * USA.
23  *
24  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25  * in the United States and other countries.]
26  *
27  * ---------------------
28  * ObjectRefHandler.java
29  * ---------------------
30  * (C)opyright 2003, by Thomas Morgner and Contributors.
31  *
32  * Original Author: Thomas Morgner;
33  * Contributor(s): David Gilbert (for Object Refinery Limited);
34  *
35  * $Id: ObjectRefHandler.java,v 1.3 2005/10/18 13:33:32 mungady Exp $
36  *
37  * Changes
38  * -------
39  * 29-Sep-2003 : Initial version (TM);
40  * 25-Nov-2003 : Updated header and Javadocs (DG);
41  *
42  */
43
44 package org.jfree.xml.parser.coretypes;
45
46 import org.jfree.xml.parser.AbstractXmlReadHandler;
47 import org.xml.sax.Attributes JavaDoc;
48 import org.xml.sax.SAXException JavaDoc;
49
50 /**
51  * A SAX handler for an object reference.
52  */
53 public class ObjectRefHandler extends AbstractXmlReadHandler {
54
55     /** The object. */
56     private Object JavaDoc object;
57   
58     /** The property name. */
59     private String JavaDoc propertyName;
60
61     /**
62      * Creates a new handler.
63      */
64     public ObjectRefHandler() {
65         super();
66     }
67
68     /**
69      * Starts parsing.
70      *
71      * @param attrs the attributes.
72      *
73      * @throws SAXException ???.
74      */
75     protected void startParsing(final Attributes JavaDoc attrs) throws SAXException JavaDoc {
76         final String JavaDoc tagName = getTagName();
77         if (tagName.equals("objectRef")) {
78             final String JavaDoc sourceName = attrs.getValue("source");
79             if (sourceName == null) {
80                 throw new SAXException JavaDoc("Source name is not defined.");
81             }
82             this.propertyName = attrs.getValue("property");
83             if (this.propertyName == null) {
84                 throw new SAXException JavaDoc("Property name is not defined.");
85             }
86
87             this.object = getRootHandler().getHelperObject(sourceName);
88             if (this.object == null) {
89                 throw new SAXException JavaDoc("Referenced object is undefined.");
90             }
91         }
92     }
93
94     /**
95      * Returns the property name.
96      *
97      * @return the property name.
98      */
99     public String JavaDoc getPropertyName() {
100         return this.propertyName;
101     }
102
103     /**
104      * Returns the value.
105      *
106      * @return the value.
107      */
108     public Object JavaDoc getObject() {
109         return this.object;
110     }
111
112 }
113
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