1 /*
2 * $Header: /home/cvs/jakarta-commons/betwixt/src/java/org/apache/commons/betwixt/io/SAXBeanWriter.java,v 1.3 2002/07/19 00:54:55 mvdb Exp $
3 * $Revision: 1.3 $
4 * $Date: 2002/07/19 00:54:55 $
5 *
6 * ====================================================================
7 *
8 * The Apache Software License, Version 1.1
9 *
10 * Copyright (c) 1999-2002 The Apache Software Foundation. All rights
11 * reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 *
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 *
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in
22 * the documentation and/or other materials provided with the
23 * distribution.
24 *
25 * 3. The end-user documentation included with the redistribution, if
26 * any, must include the following acknowlegement:
27 * "This product includes software developed by the
28 * Apache Software Foundation (http://www.apache.org/)."
29 * Alternately, this acknowlegement may appear in the software itself,
30 * if and wherever such third-party acknowlegements normally appear.
31 *
32 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
33 * Foundation" must not be used to endorse or promote products derived
34 * from this software without prior written permission. For written
35 * permission, please contact apache@apache.org.
36 *
37 * 5. Products derived from this software may not be called "Apache"
38 * nor may "Apache" appear in their names without prior written
39 * permission of the Apache Group.
40 *
41 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
42 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
43 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
44 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
45 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
46 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
47 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
48 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
49 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
50 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
51 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * SUCH DAMAGE.
53 * ====================================================================
54 *
55 * This software consists of voluntary contributions made by many
56 * individuals on behalf of the Apache Software Foundation. For more
57 * information on the Apache Software Foundation, please see
58 * <http://www.apache.org/>;.
59 *
60 * $Id: SAXBeanWriter.java,v 1.3 2002/07/19 00:54:55 mvdb Exp $
61 */
62 package org.apache.commons.betwixt.io;
63
64 import java.beans.IntrospectionException;
65 import java.io.BufferedWriter;
66 import java.io.IOException;
67 import java.io.OutputStream;
68 import java.io.OutputStreamWriter;
69 import java.io.Writer;
70 import java.util.Iterator;
71 import java.util.HashMap;
72
73 import org.apache.commons.logging.Log;
74 import org.apache.commons.logging.LogFactory;
75
76 import org.apache.commons.betwixt.AttributeDescriptor;
77 import org.apache.commons.betwixt.ElementDescriptor;
78 import org.apache.commons.betwixt.XMLBeanInfo;
79 import org.apache.commons.betwixt.XMLIntrospector;
80 import org.apache.commons.betwixt.expression.Context;
81 import org.apache.commons.betwixt.expression.Expression;
82 import org.apache.commons.betwixt.io.id.SequentialIDGenerator;
83
84 import org.xml.sax.ContentHandler;
85 import org.xml.sax.SAXException;
86 import org.xml.sax.helpers.AttributesImpl;
87
88 // FIX ME
89 // At the moment, namespaces are NOT supported!
90
91 /***
92 * The SAXBeanwriter will send events to a ContentHandler
93 *
94 * @author <a href="mailto:rdonkin@apache.org">Robert Burrell Donkin</a>
95 * @author <a href="mailto:martin@mvdb.net">Martin van den Bemt</a>
96 * @version $Id: SAXBeanWriter.java,v 1.3 2002/07/19 00:54:55 mvdb Exp $
97 */
98 public class SAXBeanWriter extends AbstractBeanWriter {
99
100 /*** Where the output goes */
101 private ContentHandler contentHandler;
102 /*** Log used for logging (Doh!) */
103 private Log log = LogFactory.getLog( BeanWriter.class );
104
105 private String lastElementName;
106
107 private AttributesImpl attributes;
108
109 private boolean elementWaiting = false;
110
111 /***
112 * <p> Constructor sets writer used for output.</p>
113 *
114 * @param writer write out representations to this writer
115 */
116 public SAXBeanWriter(ContentHandler contentHandler) {
117 this.contentHandler = contentHandler;
118 }
119
120 /***
121 * <p> Get the current level for logging. </p>
122 *
123 * @return a <code>org.apache.commons.logging.Log</code> level constant
124 */
125 public Log getLog() {
126 return log;
127 }
128
129 /***
130 * <p> Set the current logging level. </p>
131 *
132 * @param level a <code>org.apache.commons.logging.Log</code> level constant
133 */
134 public void setLog(Log log) {
135 this.log = log;
136 }
137
138
139 // Expression methods
140 //-------------------------------------------------------------------------
141
142 /*** Express an element tag start using given qualified name */
143 protected void expressElementStart(String qualifiedName) throws SAXException {
144 // make sure any previous elements have been sent
145 sendElementStart();
146 // ok prepare for new one
147 elementWaiting = true;
148 attributes = new AttributesImpl();
149 lastElementName = qualifiedName;
150 }
151
152 protected void expressTagClose() {
153 // using this could probably make life easier
154 // but i only know that i needed it after i'd written the rest
155 }
156
157 /*** Express an element end tag using given qualifiedName */
158 protected void expressElementEnd(String qualifiedName) throws SAXException {
159 // make sure that we sent the last element to be handled
160 sendElementStart();
161 // can't handle namespaces yet
162 contentHandler.endElement("","",qualifiedName);
163 }
164
165 /*** Express an empty element end */
166 protected void expressElementEnd() throws SAXException {
167 // last element name must be correct since there haven't been any tag in between
168 contentHandler.endElement("","",lastElementName);
169 }
170
171 /*** Express body text */
172 protected void expressBodyText(String text) throws SAXException {
173 // FIX ME
174 // CHECK UNICODE->CHAR CONVERSION!
175 // THIS WILL QUITE POSSIBLY BREAK FOR NON-ROMAN
176 char[] body = text.toCharArray();
177 contentHandler.characters(body, 0, body.length);
178 }
179
180 /*** Express an attribute */
181 protected void expressAttribute(
182 String qualifiedName,
183 String value)
184 throws
185 SAXException {
186 // FIX ME
187 // SHOULD PROBABLY SUPPORT ID IDREF HERE
188 attributes.addAttribute("", "", qualifiedName, "CDATA", value);
189 }
190
191
192 // Implementation methods
193 //-------------------------------------------------------------------------
194
195 private void sendElementStart() throws SAXException {
196 if (elementWaiting) {
197 contentHandler.startElement("","",lastElementName,attributes);
198 elementWaiting = false;
199 }
200 }
201 /***
202 * This will announce the start of the document
203 * to the contenthandler.
204 *
205 * @see org.apache.commons.betwixt.io.AbstractBeanWriter#end()
206 */
207
208 public void start() throws SAXException {
209 contentHandler.startDocument();
210 }
211
212 /***
213 * This method will announce the end of the document to
214 * the contenthandler.
215 *
216 * @see org.apache.commons.betwixt.io.AbstractBeanWriter#start()
217 */
218 public void end() throws SAXException {
219 contentHandler.endDocument();
220 }
221
222 }
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