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

   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: ValueConverter.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: /**
  34:  * A value converter is an object that can transform an object into a string or vice
  35:  * versa.
  36:  *
  37:  * @author Thomas Morgner
  38:  */
  39: public interface ValueConverter
  40: {
  41:   /**
  42:    * Converts an object to an attribute value.
  43:    *
  44:    * @param o the object.
  45:    * @return the attribute value.
  46:    * @throws BeanException if there was an error during the conversion.
  47:    */
  48:   public String toAttributeValue (Object o) throws BeanException;
  49: 
  50:   /**
  51:    * Converts a string to a property value.
  52:    *
  53:    * @param s the string.
  54:    * @return a property value.
  55:    * @throws BeanException if there was an error during the conversion.
  56:    */
  57:   public Object toPropertyValue (String s) throws BeanException;
  58: }