001 /**
002 * <a href="http://activemq.org">ActiveMQ: The Open Source Message Fabric</a>
003 *
004 * Copyright 2004 Protique Ltd
005 *
006 * Licensed under the Apache License, Version 2.0 (the "License");
007 * you may not use this file except in compliance with the License.
008 * You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 *
018 **/
019 package org.activemq.util;
020
021 import java.beans.PropertyEditor;
022 import java.beans.PropertyEditorManager;
023 import java.lang.reflect.Method;
024 import java.net.URI;
025 import java.net.URISyntaxException;
026 import java.util.Iterator;
027 import java.util.Map;
028
029 import org.apache.commons.logging.Log;
030 import org.apache.commons.logging.LogFactory;
031
032 public class ReflectionSupport {
033
034 private static final Log log = LogFactory.getLog(ReflectionSupport.class);
035
036 public static void setProperties(Object target, Map props) {
037 if( target == null )
038 throw new IllegalArgumentException("target was null.");
039 if( props == null )
040 throw new IllegalArgumentException("props was null.");
041
042 for (Iterator iter = props.keySet().iterator(); iter.hasNext();) {
043 String name = (String) iter.next();
044 Object value = props.get(name);
045 setProperty(target, name, value);
046 }
047 }
048
049 private static void setProperty(Object target, String name, Object value) {
050 Class clazz = target.getClass();
051 Method setter = findSetterMethod(clazz, name);
052 try {
053 // If the type is null or it matches the needed type, just use the value directly
054 if( value == null || value.getClass()==setter.getParameterTypes()[0] ) {
055 setter.invoke(target, new Object[]{value});
056 } else {
057 // We need to convert it
058 setter.invoke(target, new Object[]{ convert(value, setter.getParameterTypes()[0]) });
059 }
060 } catch (Throwable e) {
061 log.debug("Could not set property: "+name+", value: "+value);
062 }
063 }
064
065 private static Object convert(Object value, Class type) throws URISyntaxException {
066 PropertyEditor editor = PropertyEditorManager.findEditor(type);
067 if( editor != null ) {
068 editor.setAsText(value.toString());
069 return editor.getValue();
070 }
071 if( type == URI.class ) {
072 return new URI(value.toString());
073 }
074 return null;
075 }
076
077 private static Method findSetterMethod(Class clazz, String name) {
078 // Build the method name.
079 name = "set"+name.substring(0,1).toUpperCase()+name.substring(1);
080 Method[] methods = clazz.getMethods();
081 for (int i = 0; i < methods.length; i++) {
082 Method method = methods[i];
083 Class params[] = method.getParameterTypes();
084 if( method.getName().equals(name)
085 && params.length==1
086 && isSettableType(params[0])) {
087 return method;
088 }
089 }
090 return null;
091 }
092
093 private static boolean isSettableType(Class clazz) {
094 if( PropertyEditorManager.findEditor(clazz)!=null )
095 return true;
096 if( clazz == URI.class )
097 return true;
098 return false;
099 }
100
101 }