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 }