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: AttributeExpressionReadHandler.java 3525 2007-10-16 11:43:48Z tmorgner $
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 org.jfree.xmlns.parser.ParseException;
034    import org.jfree.xmlns.parser.StringReadHandler;
035    import org.jfree.xmlns.parser.XmlReadHandler;
036    import org.xml.sax.Attributes;
037    import org.xml.sax.SAXException;
038    
039    /**
040     * Creation-Date: 09.04.2006, 13:40:08
041     *
042     * @author Thomas Morgner
043     */
044    public class AttributeExpressionReadHandler
045            extends AbstractExpressionReadHandler
046    {
047      private StringReadHandler nameReadHandler;
048      private StringReadHandler namespaceUriReadHandler;
049      private String attributeName;
050      private String namespace;
051    
052      public AttributeExpressionReadHandler()
053      {
054      }
055    
056      /**
057       * Returns the handler for a child element.
058       *
059       * @param tagName the tag name.
060       * @param atts    the attributes.
061       * @return the handler or null, if the tagname is invalid.
062       * @throws SAXException       if there is a parsing error.
063       */
064      protected XmlReadHandler getHandlerForChild(final String uri,
065                                                  final String tagName,
066                                                  final Attributes atts)
067              throws SAXException
068      {
069        if (isSameNamespace(uri) == false)
070        {
071          return null;
072        }
073        if ("attribute-name".equals(tagName))
074        {
075          nameReadHandler = new StringReadHandler();
076          return nameReadHandler;
077        }
078        if ("attribute-namespace-uri".equals(tagName))
079        {
080          namespaceUriReadHandler = new StringReadHandler();
081          return namespaceUriReadHandler;
082        }
083        return super.getHandlerForChild(uri, tagName, atts);
084      }
085    
086      /**
087       * Done parsing.
088       *
089       * @throws SAXException       if there is a parsing error.
090       */
091      protected void doneParsing() throws SAXException
092      {
093        super.doneParsing();
094        if (nameReadHandler == null)
095        {
096          throw new ParseException
097              ("Required element 'attribute-name' is missing.", getLocator());
098        }
099    
100        attributeName = nameReadHandler.getResult();
101    
102        if (namespaceUriReadHandler != null)
103        {
104          namespace = namespaceUriReadHandler.getResult();
105        }
106        if (namespace == null)
107        {
108          namespace = getNamespace();
109        }
110    
111      }
112    
113      public String getNamespace()
114      {
115        return namespace;
116      }
117    
118      public String getAttributeName()
119      {
120        return attributeName;
121      }
122    }