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: BeanPropertyLookupParser.java 2725 2007-04-01 18:49:29Z taqua $
027     * ------------
028     * (C) Copyright 2000-2005, by Object Refinery Limited.
029     * (C) Copyright 2005-2007, by Pentaho Corporation.
030     */
031    package org.jfree.report.util.beans;
032    
033    import org.jfree.report.util.CSVTokenizer;
034    import org.jfree.report.util.PropertyLookupParser;
035    
036    public abstract class BeanPropertyLookupParser extends PropertyLookupParser
037    {
038      public BeanPropertyLookupParser ()
039      {
040      }
041    
042      /**
043       *
044       * @param name
045       * @return
046       */
047      protected abstract Object performInitialLookup (String name);
048    
049      protected String lookupVariable (final String entity)
050      {
051        // first, split the entity into separate strings (separator is '.').
052    
053        final CSVTokenizer tokenizer = new CSVTokenizer(entity, ".");
054        if (tokenizer.hasMoreTokens())
055        {
056          final String name = tokenizer.nextToken();
057          final Object base = performInitialLookup(name);
058          try
059          {
060            if (tokenizer.hasMoreTokens())
061            {
062              return continueLookupVariable(tokenizer, base);
063            }
064            else
065            {
066              return ConverterRegistry.toAttributeValue(base);
067            }
068          }
069          catch (BeanException e)
070          {
071            return entity;
072          }
073        }
074        return entity;
075      }
076    
077      private static String continueLookupVariable (final CSVTokenizer tokenizer,
078                                                    final Object parent)
079              throws BeanException
080      {
081        if (tokenizer.hasMoreTokens())
082        {
083          final String name = tokenizer.nextToken();
084          final Object base = ConverterRegistry.toPropertyValue(name, parent.getClass());
085          if (tokenizer.hasMoreTokens())
086          {
087            return continueLookupVariable(tokenizer, base);
088          }
089          else
090          {
091            return ConverterRegistry.toAttributeValue(base);
092          }
093        }
094        return null;
095      }
096    
097    }