Source for 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;
  48: import org.xml.sax.SAXException;
  49: 
  50: /**
  51:  * A SAX handler for an object reference.
  52:  */
  53: public class ObjectRefHandler extends AbstractXmlReadHandler {
  54: 
  55:     /** The object. */
  56:     private Object object;
  57:   
  58:     /** The property name. */
  59:     private String 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 attrs) throws SAXException {
  76:         final String tagName = getTagName();
  77:         if (tagName.equals("objectRef")) {
  78:             final String sourceName = attrs.getValue("source");
  79:             if (sourceName == null) {
  80:                 throw new SAXException("Source name is not defined.");
  81:             }
  82:             this.propertyName = attrs.getValue("property");
  83:             if (this.propertyName == null) {
  84:                 throw new SAXException("Property name is not defined.");
  85:             }
  86: 
  87:             this.object = getRootHandler().getHelperObject(sourceName);
  88:             if (this.object == null) {
  89:                 throw new SAXException("Referenced object is undefined.");
  90:             }
  91:         }
  92:     }
  93: 
  94:     /**
  95:      * Returns the property name.
  96:      * 
  97:      * @return the property name.
  98:      */
  99:     public String getPropertyName() {
 100:         return this.propertyName;
 101:     }
 102: 
 103:     /**
 104:      * Returns the value.
 105:      * 
 106:      * @return the value.
 107:      */
 108:     public Object getObject() {
 109:         return this.object;
 110:     }
 111: 
 112: }