001 /* 002 * $Id: MetaFieldProperty.java,v 1.4 2005/08/25 22:08:35 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 import java.security.AccessController; 042 import java.security.PrivilegedExceptionAction; 043 044 /** 045 * Represents a property on a bean which may have a getter and/or a setter 046 * 047 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> 048 * @version $Revision: 1.4 $ 049 */ 050 public class MetaFieldProperty extends MetaProperty { 051 052 private Field field; 053 054 public MetaFieldProperty(Field field) { 055 super(field.getName(), field.getType()); 056 this.field = field; 057 } 058 059 /** 060 * @return the property of the given object 061 * @throws Exception if the property could not be evaluated 062 */ 063 public Object getProperty(Object object) throws Exception { 064 final Field field1 = field; 065 final Object object1 = object; 066 Object value = (Object) AccessController.doPrivileged(new PrivilegedExceptionAction() { 067 public Object run() throws IllegalAccessException { 068 field1.setAccessible(true); 069 return field1.get(object1); 070 } 071 }); 072 return value; 073 } 074 075 /** 076 * Sets the property on the given object to the new value 077 * 078 * @param object on which to set the property 079 * @param newValue the new value of the property 080 * @throws Exception if the property could not be set 081 */ 082 public void setProperty(Object object, Object newValue) { 083 final Field field1 = field; 084 final Object object1 = object; 085 final Object newValue1 = newValue; 086 try { 087 AccessController.doPrivileged(new PrivilegedExceptionAction() { 088 public Object run() throws IllegalAccessException, TypeMismatchException, GroovyRuntimeException { 089 try { 090 field1.set(object1, newValue1); 091 return newValue1; 092 } 093 catch (IllegalArgumentException e) { 094 try { 095 Object newValue2 = InvokerHelper.asType(newValue1, field1.getType()); 096 field1.set(object1, newValue2); 097 return newValue2; 098 } 099 catch (Exception ex) { 100 throw new TypeMismatchException( "'" + toName(object1.getClass()) + "." + field1.getName() 101 + "' can not refer to the value '" 102 + newValue1 + "' (type " + toName(newValue1.getClass()) 103 + "), because it is of the type " + toName(field1.getType()) ); 104 } 105 } 106 catch (Exception ex) { 107 throw new GroovyRuntimeException("Cannot set the property '" + name + "'.", ex); 108 } 109 } 110 }); 111 } 112 catch (TypeMismatchException ex) { 113 throw ex; 114 } 115 catch (Exception ex) { 116 throw new GroovyRuntimeException("Cannot set the property '" + name + "'.", ex); 117 } 118 } 119 120 private String toName(Class c) { 121 String s = c.toString(); 122 if (s.startsWith("class ") && s.length() > 6) 123 return s.substring(6); 124 else 125 return s; 126 } 127 }