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: GenericValueConverter.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 java.beans.IntrospectionException; 034 import java.beans.PropertyDescriptor; 035 import java.beans.PropertyEditor; 036 037 /** 038 * A class that handles the conversion of {@link Integer} attributes to and from their 039 * {@link String} representation. 040 * 041 * @author Thomas Morgner 042 */ 043 public class GenericValueConverter implements ValueConverter 044 { 045 private PropertyDescriptor propertyDescriptor; 046 private PropertyEditor propertyEditor; 047 048 /** 049 * Creates a new value converter. 050 */ 051 public GenericValueConverter (final PropertyDescriptor pd) 052 throws IntrospectionException 053 { 054 if (pd == null) 055 { 056 throw new NullPointerException("PropertyDescriptor must not be null."); 057 } 058 if (pd.getPropertyEditorClass() == null) 059 { 060 throw new IntrospectionException("Property has no editor."); 061 } 062 this.propertyDescriptor = pd; 063 this.propertyEditor = createPropertyEditor(pd); 064 } 065 066 private PropertyEditor createPropertyEditor (final PropertyDescriptor pi) 067 throws IntrospectionException 068 { 069 final Class c = pi.getPropertyEditorClass(); 070 try 071 { 072 return (PropertyEditor) c.newInstance(); 073 } 074 catch (Exception e) 075 { 076 throw new IntrospectionException("Unable to create PropertyEditor."); 077 } 078 } 079 080 081 /** 082 * Converts the attribute to a string. 083 * 084 * @param o the attribute ({@link Integer} expected). 085 * @return A string representing the {@link Integer} value. 086 * @throws BeanException if there was an error during the conversion. 087 */ 088 public String toAttributeValue (final Object o) throws BeanException 089 { 090 if (BeanUtility.getPropertyType(propertyDescriptor).isInstance(o) == false) 091 { 092 throw new ClassCastException("Give me a real type."); 093 } 094 095 propertyEditor.setValue(o); 096 return propertyEditor.getAsText(); 097 } 098 099 /** 100 * Converts a string to a {@link Integer}. 101 * 102 * @param s the string. 103 * @return a {@link Integer}. 104 */ 105 public Object toPropertyValue (final String s) 106 { 107 propertyEditor.setAsText(s); 108 return propertyEditor.getValue(); 109 } 110 }