001 /* 002 * $Id: MetaFieldProperty.java,v 1.3 2005/03/22 16:48:51 phk Exp $ 003 * 004 * Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved. 005 * 006 * Redistribution and use of this software and associated documentation 007 * ("Software"), with or without modification, are permitted provided that the 008 * following conditions are met: 009 * 1. Redistributions of source code must retain copyright statements and 010 * notices. Redistributions must also contain a copy of this document. 011 * 2. Redistributions in binary form must reproduce the above copyright 012 * notice, this list of conditions and the following disclaimer in the 013 * documentation and/or other materials provided with the distribution. 014 * 3. The name "groovy" must not be used to endorse or promote products 015 * derived from this Software without prior written permission of The Codehaus. 016 * For written permission, please contact info@codehaus.org. 017 * 4. Products derived from this Software may not be called "groovy" nor may 018 * "groovy" appear in their names without prior written permission of The 019 * Codehaus. "groovy" is a registered trademark of The Codehaus. 020 * 5. Due credit should be given to The Codehaus - http://groovy.codehaus.org/ 021 * 022 * THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS ``AS IS'' AND ANY 023 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 024 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 025 * DISCLAIMED. IN NO EVENT SHALL THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR 026 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 027 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 028 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 029 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 030 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 031 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 032 * DAMAGE. 033 * 034 */ 035 036 package groovy.lang; 037 038 039 import org.codehaus.groovy.runtime.InvokerHelper; 040 import java.lang.reflect.Field; 041 042 /** 043 * Represents a property on a bean which may have a getter and/or a setter 044 * 045 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> 046 * @version $Revision: 1.3 $ 047 */ 048 public class MetaFieldProperty extends MetaProperty { 049 050 private Field field; 051 052 public MetaFieldProperty(Field field) { 053 super(field.getName(), field.getType()); 054 055 this.field = field; 056 } 057 058 /** 059 * @return the property of the given object 060 * @throws Exception if the property could not be evaluated 061 */ 062 public Object getProperty(Object object) throws Exception { 063 return field.get(object); 064 } 065 066 /** 067 * Sets the property on the given object to the new value 068 * 069 * @param object on which to set the property 070 * @param newValue the new value of the property 071 * @throws Exception if the property could not be set 072 */ 073 public void setProperty(Object object, Object newValue) { 074 try { 075 field.set(object, newValue); 076 } 077 catch (IllegalArgumentException e) { 078 try { 079 field.set(object, InvokerHelper.asType(newValue, field.getType())); 080 } 081 catch (Exception ex) { 082 throw new TypeMismatchException( "'" + toName(object.getClass()) + "." + field.getName() 083 + "' can not refer to the value '" 084 + newValue + "' (type " + toName(newValue.getClass()) 085 + "), because it is of the type " + toName(field.getType()) ); 086 } 087 } 088 catch (Exception e) { 089 throw new GroovyRuntimeException("Cannot set the property '" + name + "'.", e); 090 } 091 } 092 093 private String toName(Class c) { 094 String s = c.toString(); 095 if (s.startsWith("class ") && s.length() > 6) 096 return s.substring(6); 097 else 098 return s; 099 } 100 }