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: ValueConverter.java,v 1.9 2007/04/01 18:49:34 taqua Exp $
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 /**
034 * A value converter is an object that can transform an object into a string or vice
035 * versa.
036 *
037 * @author Thomas Morgner
038 */
039 public interface ValueConverter
040 {
041 /**
042 * Converts an object to an attribute value.
043 *
044 * @param o the object.
045 * @return the attribute value.
046 * @throws BeanException if there was an error during the conversion.
047 */
048 public String toAttributeValue (Object o) throws BeanException;
049
050 /**
051 * Converts a string to a property value.
052 *
053 * @param s the string.
054 * @return a property value.
055 * @throws BeanException if there was an error during the conversion.
056 */
057 public Object toPropertyValue (String s) throws BeanException;
058 }