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 3048 2007-07-28 18:02:42Z tmorgner $ 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 }