1 /* 2 * $Id: MetaFieldProperty.java,v 1.3 2005/03/22 16:48:51 phk Exp $ 3 * 4 * Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved. 5 * 6 * Redistribution and use of this software and associated documentation 7 * ("Software"), with or without modification, are permitted provided that the 8 * following conditions are met: 9 * 1. Redistributions of source code must retain copyright statements and 10 * notices. Redistributions must also contain a copy of this document. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name "groovy" must not be used to endorse or promote products 15 * derived from this Software without prior written permission of The Codehaus. 16 * For written permission, please contact info@codehaus.org. 17 * 4. Products derived from this Software may not be called "groovy" nor may 18 * "groovy" appear in their names without prior written permission of The 19 * Codehaus. "groovy" is a registered trademark of The Codehaus. 20 * 5. Due credit should be given to The Codehaus - http://groovy.codehaus.org/ 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS ``AS IS'' AND ANY 23 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 24 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 25 * DISCLAIMED. IN NO EVENT SHALL THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR 26 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 28 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 29 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 32 * DAMAGE. 33 * 34 */ 35 36 package groovy.lang; 37 38 39 import org.codehaus.groovy.runtime.InvokerHelper; 40 import java.lang.reflect.Field; 41 42 /*** 43 * Represents a property on a bean which may have a getter and/or a setter 44 * 45 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> 46 * @version $Revision: 1.3 $ 47 */ 48 public class MetaFieldProperty extends MetaProperty { 49 50 private Field field; 51 52 public MetaFieldProperty(Field field) { 53 super(field.getName(), field.getType()); 54 55 this.field = field; 56 } 57 58 /*** 59 * @return the property of the given object 60 * @throws Exception if the property could not be evaluated 61 */ 62 public Object getProperty(Object object) throws Exception { 63 return field.get(object); 64 } 65 66 /*** 67 * Sets the property on the given object to the new value 68 * 69 * @param object on which to set the property 70 * @param newValue the new value of the property 71 * @throws Exception if the property could not be set 72 */ 73 public void setProperty(Object object, Object newValue) { 74 try { 75 field.set(object, newValue); 76 } 77 catch (IllegalArgumentException e) { 78 try { 79 field.set(object, InvokerHelper.asType(newValue, field.getType())); 80 } 81 catch (Exception ex) { 82 throw new TypeMismatchException( "'" + toName(object.getClass()) + "." + field.getName() 83 + "' can not refer to the value '" 84 + newValue + "' (type " + toName(newValue.getClass()) 85 + "), because it is of the type " + toName(field.getType()) ); 86 } 87 } 88 catch (Exception e) { 89 throw new GroovyRuntimeException("Cannot set the property '" + name + "'.", e); 90 } 91 } 92 93 private String toName(Class c) { 94 String s = c.toString(); 95 if (s.startsWith("class ") && s.length() > 6) 96 return s.substring(6); 97 else 98 return s; 99 } 100 }