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Java > Open Source Codes > groovy > lang > MetaFieldProperty


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 JavaDoc;
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 JavaDoc field;
51
52     public MetaFieldProperty(Field JavaDoc 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 JavaDoc getProperty(Object JavaDoc object) throws Exception JavaDoc {
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 JavaDoc object, Object JavaDoc newValue) {
74         try {
75             field.set(object, newValue);
76         }
77         catch (IllegalArgumentException JavaDoc e) {
78             try {
79                 field.set(object, InvokerHelper.asType(newValue, field.getType()));
80             }
81             catch (Exception JavaDoc 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 JavaDoc e) {
89             throw new GroovyRuntimeException("Cannot set the property '" + name + "'.", e);
90         }
91     }
92
93     private String JavaDoc toName(Class JavaDoc c) {
94         String JavaDoc s = c.toString();
95         if (s.startsWith("class ") && s.length() > 6)
96             return s.substring(6);
97         else
98             return s;
99     }
100 }
101
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