Source for org.jfree.report.util.beans.BeanPropertyLookupParser

   1: /**
   2:  * ========================================
   3:  * JFreeReport : a free Java report library
   4:  * ========================================
   5:  *
   6:  * Project Info:  http://reporting.pentaho.org/
   7:  *
   8:  * (C) Copyright 2000-2007, by Object Refinery Limited, Pentaho Corporation and Contributors.
   9:  *
  10:  * This library is free software; you can redistribute it and/or modify it under the terms
  11:  * of the GNU Lesser General Public License as published by the Free Software Foundation;
  12:  * either version 2.1 of the License, or (at your option) any later version.
  13:  *
  14:  * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  15:  * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  16:  * See the GNU Lesser General Public License for more details.
  17:  *
  18:  * You should have received a copy of the GNU Lesser General Public License along with this
  19:  * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  20:  * Boston, MA 02111-1307, USA.
  21:  *
  22:  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
  23:  * in the United States and other countries.]
  24:  *
  25:  * ------------
  26:  * $Id: BeanPropertyLookupParser.java 2725 2007-04-01 18:49:29Z taqua $
  27:  * ------------
  28:  * (C) Copyright 2000-2005, by Object Refinery Limited.
  29:  * (C) Copyright 2005-2007, by Pentaho Corporation.
  30:  */
  31: package org.jfree.report.util.beans;
  32: 
  33: import org.jfree.report.util.CSVTokenizer;
  34: import org.jfree.report.util.PropertyLookupParser;
  35: 
  36: public abstract class BeanPropertyLookupParser extends PropertyLookupParser
  37: {
  38:   public BeanPropertyLookupParser ()
  39:   {
  40:   }
  41: 
  42:   /**
  43:    *
  44:    * @param name
  45:    * @return
  46:    */
  47:   protected abstract Object performInitialLookup (String name);
  48: 
  49:   protected String lookupVariable (final String entity)
  50:   {
  51:     // first, split the entity into separate strings (separator is '.').
  52: 
  53:     final CSVTokenizer tokenizer = new CSVTokenizer(entity, ".");
  54:     if (tokenizer.hasMoreTokens())
  55:     {
  56:       final String name = tokenizer.nextToken();
  57:       final Object base = performInitialLookup(name);
  58:       try
  59:       {
  60:         if (tokenizer.hasMoreTokens())
  61:         {
  62:           return continueLookupVariable(tokenizer, base);
  63:         }
  64:         else
  65:         {
  66:           return ConverterRegistry.toAttributeValue(base);
  67:         }
  68:       }
  69:       catch (BeanException e)
  70:       {
  71:         return entity;
  72:       }
  73:     }
  74:     return entity;
  75:   }
  76: 
  77:   private static String continueLookupVariable (final CSVTokenizer tokenizer,
  78:                                                 final Object parent)
  79:           throws BeanException
  80:   {
  81:     if (tokenizer.hasMoreTokens())
  82:     {
  83:       final String name = tokenizer.nextToken();
  84:       final Object base = ConverterRegistry.toPropertyValue(name, parent.getClass());
  85:       if (tokenizer.hasMoreTokens())
  86:       {
  87:         return continueLookupVariable(tokenizer, base);
  88:       }
  89:       else
  90:       {
  91:         return ConverterRegistry.toAttributeValue(base);
  92:       }
  93:     }
  94:     return null;
  95:   }
  96: 
  97: }