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 }