001 /**
002 * ========================================
003 * JFreeReport : a free Java report library
004 * ========================================
005 *
006 * Project Info: http://reporting.pentaho.org/
007 *
008 * (C) Copyright 2000-2007, by Object Refinery Limited, Pentaho Corporation and Contributors.
009 *
010 * This library is free software; you can redistribute it and/or modify it under the terms
011 * of the GNU Lesser General Public License as published by the Free Software Foundation;
012 * either version 2.1 of the License, or (at your option) any later version.
013 *
014 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
015 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
016 * See the GNU Lesser General Public License for more details.
017 *
018 * You should have received a copy of the GNU Lesser General Public License along with this
019 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
020 * Boston, MA 02111-1307, USA.
021 *
022 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
023 * in the United States and other countries.]
024 *
025 * ------------
026 * $Id: AttributeReadHandler.java,v 1.6 2007/04/01 18:49:27 taqua Exp $
027 * ------------
028 * (C) Copyright 2000-2005, by Object Refinery Limited.
029 * (C) Copyright 2005-2007, by Pentaho Corporation.
030 */
031 package org.jfree.report.modules.factories.report.flow;
032
033 import java.io.ByteArrayInputStream;
034 import java.io.IOException;
035 import java.io.ObjectInputStream;
036
037 import org.jfree.report.util.CharacterEntityParser;
038 import org.jfree.report.util.beans.BeanException;
039 import org.jfree.report.util.beans.ConverterRegistry;
040 import org.jfree.util.Log;
041 import org.jfree.util.ObjectUtilities;
042 import org.jfree.xmlns.parser.Base64;
043 import org.jfree.xmlns.parser.ParseException;
044 import org.jfree.xmlns.parser.PropertyReadHandler;
045 import org.xml.sax.Attributes;
046 import org.xml.sax.SAXException;
047
048 /**
049 * Creation-Date: 09.04.2006, 12:58:24
050 *
051 * @author Thomas Morgner
052 */
053 public class AttributeReadHandler extends PropertyReadHandler
054 {
055 private String encoding;
056 private String className;
057 private Object value;
058 private CharacterEntityParser entityParser;
059 private String namespace;
060
061 public AttributeReadHandler()
062 {
063 this.entityParser = CharacterEntityParser.createXMLEntityParser();
064 }
065
066 /**
067 * Done parsing.
068 *
069 * @throws SAXException if there is a parsing error.
070 */
071 protected void doneParsing() throws SAXException
072 {
073 super.doneParsing();
074 try
075 {
076 final String result = getResult();
077 if ("base64".equals(encoding))
078 {
079 final byte[] data = Base64.decode(result.trim().toCharArray());
080 final ByteArrayInputStream bin = new ByteArrayInputStream(data);
081 final ObjectInputStream oin = new ObjectInputStream(bin);
082 value = oin.readObject();
083 }
084 else
085 {
086 if (className != null)
087 {
088 ClassLoader cl = ObjectUtilities.getClassLoader
089 (AttributeReadHandler.class);
090 Class c = cl.loadClass(className);
091 ConverterRegistry.toPropertyValue
092 (entityParser.decodeEntities(result), c);
093 }
094 else
095 {
096 ConverterRegistry.toPropertyValue
097 (entityParser.decodeEntities(result), String.class);
098 }
099 }
100 }
101 catch (BeanException e)
102 {
103 throw new ParseException("Unable to set attribute '" + getName() + "'", e, getLocator());
104 }
105 catch (ClassNotFoundException e)
106 {
107 throw new ParseException("Unable to set attribute '" + getName() + "'", e, getLocator() );
108 }
109 catch (IOException e)
110 {
111 throw new ParseException("Unable to set attribute '" + getName() + "'", e, getLocator());
112 }
113 }
114
115 /**
116 * Starts parsing.
117 *
118 * @param attrs the attributes.
119 * @throws SAXException if there is a parsing error.
120 */
121 protected void startParsing(final Attributes attrs) throws SAXException
122 {
123 super.startParsing(attrs);
124 namespace = attrs.getValue(getUri(), "namespace-uri");
125 if (namespace == null)
126 {
127 namespace = getNamespace();
128 }
129
130 className = attrs.getValue(getUri(), "class");
131 if (className == null)
132 {
133 className = "java.lang.String";
134 }
135 encoding = attrs.getValue(getUri(), "encoding");
136 if (encoding == null)
137 {
138 encoding = "text";
139 }
140 else if (("text".equals(encoding) == false) && "base64".equals(encoding) == false)
141 {
142 Log.warn ("Invalid value for attribute 'encoding'. Defaulting to 'text'");
143 encoding = "text";
144 }
145 }
146
147 public String getNamespace()
148 {
149 return namespace;
150 }
151
152 /**
153 * Returns the object for this element.
154 *
155 * @return the object.
156 */
157 public Object getObject()
158 {
159 return value;
160 }
161 }