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1 /* 2 * $Header: /home/cvs/jakarta-commons/betwixt/src/java/org/apache/commons/betwixt/expression/MethodUpdater.java,v 1.7 2003/01/12 13:52:03 rdonkin Exp $ 3 * $Revision: 1.7 $ 4 * $Date: 2003/01/12 13:52:03 $ 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 1.7 2003/01/12 13:52:03 rdonkin 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 import org.apache.commons.logging.Log; 68 import org.apache.commons.logging.LogFactory; 69 70 /*** <p><code>MethodUpdater</code> updates the current bean context 71 * by calling a WriteMethod with the String value from the XML attribute 72 * or element.</p> 73 * 74 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> 75 * @version $Revision: 1.7 $ 76 */ 77 public class MethodUpdater implements Updater { 78 79 /*** Logger */ 80 private static Log log = LogFactory.getLog( MethodUpdater.class ); 81 82 /*** 83 * Programmatically set log 84 * @param aLog the implementation to which this class should log 85 */ 86 public static void setLog( Log aLog ) { 87 log = aLog; 88 } 89 90 /*** The method to call on the bean */ 91 private Method method; 92 /*** The type of the first parameter of the method */ 93 private Class valueType; 94 95 /*** Base constructor */ 96 public MethodUpdater() { 97 } 98 99 /*** 100 * Convenience constructor sets method property 101 * @param method the Method to be invoked on the context's bean in the update 102 */ 103 public MethodUpdater(Method method) { 104 setMethod( method ); 105 } 106 107 /*** 108 * Updates the current bean context with the given String value 109 * @param context the Context to be updated 110 * @param newValue the update to this new value 111 */ 112 public void update(Context context, Object newValue) { 113 Object bean = context.getBean(); 114 if ( bean != null ) { 115 if ( newValue instanceof String ) { 116 // try to convert into primitive types 117 newValue = ConvertUtils.convert( (String) newValue, valueType ); 118 } 119 if ( newValue != null ) { 120 // check that it is of the correct type 121 /* 122 if ( ! valueType.isAssignableFrom( newValue.getClass() ) ) { 123 log.warn( 124 "Cannot call setter method: " + method.getName() + " on bean: " + bean 125 + " with type: " + bean.getClass().getName() 126 + " as parameter should be of type: " + valueType.getName() 127 + " but is: " + newValue.getClass().getName() 128 ); 129 return; 130 } 131 */ 132 } 133 Object[] arguments = { newValue }; 134 try { 135 if ( log.isDebugEnabled() ) { 136 log.debug( 137 "Calling setter method: " + method.getName() + " on bean: " + bean 138 + " with new value: " + newValue 139 ); 140 } 141 method.invoke( bean, arguments ); 142 143 } catch (Exception e) { 144 String valueTypeName = (newValue != null) ? newValue.getClass().getName() : "null"; 145 log.warn( 146 "Cannot evaluate method: " + method.getName() + " on bean: " + bean 147 + " of type: " + bean.getClass().getName() + " with value: " + newValue 148 + " of type: " + valueTypeName 149 ); 150 handleException(context, e); 151 } 152 } 153 } 154 155 /*** 156 * Gets the method which will be invoked by the update 157 * 158 * @return the Method to be invoked by the update 159 */ 160 public Method getMethod() { 161 return method; 162 } 163 164 /*** 165 * Sets the constant value of this expression 166 * @param method the Method to be invoked by the update 167 */ 168 public void setMethod(Method method) { 169 this.method = method; 170 Class[] types = method.getParameterTypes(); 171 if ( types == null || types.length <= 0 ) { 172 throw new IllegalArgumentException( "The Method must have at least one parameter" ); 173 } 174 this.valueType = types[0]; 175 } 176 177 // Implementation methods 178 //------------------------------------------------------------------------- 179 180 /*** 181 * Strategy method to allow derivations to handle exceptions differently. 182 * @param context the Context being updated when this exception occured 183 * @param e the Exception that occured during the update 184 */ 185 protected void handleException(Context context, Exception e) { 186 log.info( "Caught exception: " + e, e ); 187 } 188 189 /*** 190 * Returns something useful for logging. 191 * @return something useful for logging 192 */ 193 public String toString() { 194 return "MethodUpdater [method=" + method + "]"; 195 } 196 }

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