1 /*
2 * $Header: /home/cvs/jakarta-commons/betwixt/src/java/org/apache/commons/betwixt/expression/MethodUpdater.java,v 1.3 2002/07/09 21:50:31 mvdb Exp $
3 * $Revision: 1.3 $
4 * $Date: 2002/07/09 21:50:31 $
5 *
6 * ====================================================================
7 *
8 * The Apache Software License, Version 1.1
9 *
10 * Copyright (c) 1999-2002 The Apache Software Foundation. All rights
11 * reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 *
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 *
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in
22 * the documentation and/or other materials provided with the
23 * distribution.
24 *
25 * 3. The end-user documentation included with the redistribution, if
26 * any, must include the following acknowlegement:
27 * "This product includes software developed by the
28 * Apache Software Foundation (http://www.apache.org/)."
29 * Alternately, this acknowlegement may appear in the software itself,
30 * if and wherever such third-party acknowlegements normally appear.
31 *
32 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
33 * Foundation" must not be used to endorse or promote products derived
34 * from this software without prior written permission. For written
35 * permission, please contact apache@apache.org.
36 *
37 * 5. Products derived from this software may not be called "Apache"
38 * nor may "Apache" appear in their names without prior written
39 * permission of the Apache Group.
40 *
41 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
42 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
43 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
44 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
45 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
46 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
47 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
48 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
49 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
50 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
51 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * SUCH DAMAGE.
53 * ====================================================================
54 *
55 * This software consists of voluntary contributions made by many
56 * individuals on behalf of the Apache Software Foundation. For more
57 * information on the Apache Software Foundation, please see
58 * <http://www.apache.org/>;.
59 *
60 * $Id: MethodUpdater.java,v 1.3 2002/07/09 21:50:31 mvdb Exp $
61 */
62 package org.apache.commons.betwixt.expression;
63
64 import java.lang.reflect.Method;
65
66 import org.apache.commons.beanutils.ConvertUtils;
67
68 import org.apache.commons.logging.Log;
69 import org.apache.commons.logging.LogFactory;
70
71 /*** <p><code>MethodUpdater</code> updates the current bean context
72 * by calling a WriteMethod with the String value from the XML attribute
73 * or element.</p>
74 *
75 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
76 * @version $Revision: 1.3 $
77 */
78 public class MethodUpdater implements Updater {
79
80 /*** Logger */
81 private static final Log log = LogFactory.getLog( MethodUpdater.class );
82
83 /*** The method to call on the bean */
84 private Method method;
85 /*** The type of the first parameter of the method */
86 private Class valueType;
87
88 /*** Base constructor */
89 public MethodUpdater() {
90 }
91
92 /*** Convenience constructor sets method property */
93 public MethodUpdater(Method method) {
94 setMethod( method );
95 }
96
97 /*** Updates the current bean context with the given String value */
98 public void update(Context context, Object newValue) {
99 Object bean = context.getBean();
100 if ( bean != null ) {
101 if ( newValue instanceof String ) {
102 // try to convert into primitive types
103 newValue = ConvertUtils.convert( (String) newValue, valueType );
104 }
105 if ( newValue != null ) {
106 // check that it is of the correct type
107 /*
108 if ( ! valueType.isAssignableFrom( newValue.getClass() ) ) {
109 log.warn(
110 "Cannot call setter method: " + method.getName() + " on bean: " + bean
111 + " with type: " + bean.getClass().getName()
112 + " as parameter should be of type: " + valueType.getName()
113 + " but is: " + newValue.getClass().getName()
114 );
115 return;
116 }
117 */
118 }
119 Object[] arguments = { newValue };
120 try {
121 if ( log.isDebugEnabled() ) {
122 log.debug(
123 "Calling setter method: " + method.getName() + " on bean: " + bean
124 + " with new value: " + newValue
125 );
126 }
127 method.invoke( bean, arguments );
128 }
129 catch (Exception e) {
130 String valueTypeName = (newValue != null) ? newValue.getClass().getName() : "null";
131 log.warn(
132 "Cannot evaluate method: " + method.getName() + " on bean: " + bean
133 + " of type: " + bean.getClass().getName() + " with value: " + newValue
134 + " of type: " + valueTypeName
135 );
136 handleException(context, e);
137 }
138 }
139 }
140
141 /*** Gets the constant value of this expression */
142 public Method getMethod() {
143 return method;
144 }
145
146 /*** Sets the constant value of this expression */
147 public void setMethod(Method method) {
148 this.method = method;
149 Class[] types = method.getParameterTypes();
150 if ( types == null || types.length <= 0 ) {
151 throw new IllegalArgumentException( "The Method must have at least one parameter" );
152 }
153 this.valueType = types[0];
154 }
155
156 // Implementation methods
157 //-------------------------------------------------------------------------
158
159 /***
160 * Strategy method to allow derivations to handle exceptions differently.
161 */
162 protected void handleException(Context context, Exception e) {
163 log.info( "Caught exception: " + e, e );
164 }
165
166 public String toString() {
167 return "MethodUpdater [method=" + method + "]";
168 }
169 }
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