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Java > Open Source Codes > org > jfree > xml > writer > coretypes > GenericWriteHandler


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  * GenericWriteHandler.java
29  * ------------------------
30  * (C)opyright 2003-2005, by Thomas Morgner and Contributors.
31  *
32  * Original Author: Thomas Morgner;
33  * Contributor(s): David Gilbert (for Object Refinery Limited);
34  *
35  * $Id: GenericWriteHandler.java,v 1.6 2005/11/16 15:58:41 taqua Exp $
36  *
37  * Changes
38  * -------
39  * 23-Sep-2003 : Initial version (TM);
40  * 23-Dec-2003 : Added missing Javadocs (DG);
41  *
42  */
43
44 package org.jfree.xml.writer.coretypes;
45
46 import java.io.IOException JavaDoc;
47 import java.util.ArrayList JavaDoc;
48
49 import org.jfree.util.Log;
50 import org.jfree.xml.util.AttributeDefinition;
51 import org.jfree.xml.util.GenericObjectFactory;
52 import org.jfree.xml.util.ObjectDescriptionException;
53 import org.jfree.xml.util.PropertyDefinition;
54 import org.jfree.xml.writer.AbstractXmlWriteHandler;
55 import org.jfree.xml.writer.AttributeList;
56 import org.jfree.xml.writer.RootXmlWriteHandler;
57 import org.jfree.xml.writer.XMLWriter;
58 import org.jfree.xml.writer.XMLWriterException;
59
60 /**
61  * A handler for writing generic objects.
62  */
63 public class GenericWriteHandler extends AbstractXmlWriteHandler {
64
65     private GenericObjectFactory factory;
66
67     /**
68      * Creates a new handler.
69      *
70      * @param factory the object factory.
71      */
72     public GenericWriteHandler(final GenericObjectFactory factory) {
73         this.factory = factory;
74     }
75
76     /**
77      * Performs the writing of a generic object.
78      *
79      * @param tagName the tag name.
80      * @param object the generic object.
81      * @param writer the writer.
82      * @param mPlexAttribute ??.
83      * @param mPlexValue ??.
84      *
85      * @throws IOException if there is an I/O error.
86      * @throws XMLWriterException if there is a writer error.
87      */
88     public void write(final String JavaDoc tagName, final Object JavaDoc object, final XMLWriter writer,
89                       final String JavaDoc mPlexAttribute, final String JavaDoc mPlexValue)
90         throws IOException JavaDoc, XMLWriterException {
91
92         try {
93             this.factory.readProperties(object);
94
95             final AttributeList attributes = new AttributeList();
96             if (mPlexAttribute != null) {
97                 attributes.setAttribute(mPlexAttribute, mPlexValue);
98             }
99             final AttributeDefinition[] attribDefs = this.factory.getAttributeDefinitions();
100             final ArrayList JavaDoc properties = new ArrayList JavaDoc();
101             for (int i = 0; i < attribDefs.length; i++) {
102                 final AttributeDefinition adef = attribDefs[i];
103                 final String JavaDoc pName = adef.getAttributeName();
104                 final Object JavaDoc propValue = this.factory.getProperty(adef.getPropertyName());
105                 if (propValue != null) {
106                     Log.debug(
107                         "Here: " + this.factory.getBaseClass() + " -> " + adef.getPropertyName()
108                     );
109                     final String JavaDoc value = adef.getHandler().toAttributeValue(propValue);
110                     if (value != null) {
111                         attributes.setAttribute(pName, value);
112                     }
113                 }
114                 properties.add(adef.getPropertyName());
115             }
116             writer.writeTag(tagName, attributes, false);
117             writer.startBlock();
118
119             final PropertyDefinition[] propertyDefs = this.factory.getPropertyDefinitions();
120             final RootXmlWriteHandler rootHandler = getRootHandler();
121             for (int i = 0; i < propertyDefs.length; i++) {
122                 final PropertyDefinition pDef = propertyDefs[i];
123                 final String JavaDoc elementName = pDef.getElementName();
124                 rootHandler.write
125                     (elementName, this.factory.getProperty(pDef.getPropertyName()),
126                             this.factory.getTypeForTagName(elementName), writer);
127             }
128             writer.endBlock();
129             writer.writeCloseTag(tagName);
130         }
131         catch (ObjectDescriptionException ode) {
132             Log.warn ("Unable to write element", ode);
133             throw new IOException JavaDoc(ode.getMessage());
134         }
135     }
136
137 }
138
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