Source code: org/activemq/util/ReflectionSupport.java
1 /**
2 * <a href="http://activemq.org">ActiveMQ: The Open Source Message Fabric</a>
3 *
4 * Copyright 2004 Protique Ltd
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 *
18 **/
19 package org.activemq.util;
20
21 import java.beans.PropertyEditor;
22 import java.beans.PropertyEditorManager;
23 import java.lang.reflect.Method;
24 import java.net.URI;
25 import java.net.URISyntaxException;
26 import java.util.Iterator;
27 import java.util.Map;
28
29 import org.apache.commons.logging.Log;
30 import org.apache.commons.logging.LogFactory;
31
32 public class ReflectionSupport {
33
34 private static final Log log = LogFactory.getLog(ReflectionSupport.class);
35
36 public static void setProperties(Object target, Map props) {
37 if( target == null )
38 throw new IllegalArgumentException("target was null.");
39 if( props == null )
40 throw new IllegalArgumentException("props was null.");
41
42 for (Iterator iter = props.keySet().iterator(); iter.hasNext();) {
43 String name = (String) iter.next();
44 Object value = props.get(name);
45 setProperty(target, name, value);
46 }
47 }
48
49 private static void setProperty(Object target, String name, Object value) {
50 Class clazz = target.getClass();
51 Method setter = findSetterMethod(clazz, name);
52 try {
53 // If the type is null or it matches the needed type, just use the value directly
54 if( value == null || value.getClass()==setter.getParameterTypes()[0] ) {
55 setter.invoke(target, new Object[]{value});
56 } else {
57 // We need to convert it
58 setter.invoke(target, new Object[]{ convert(value, setter.getParameterTypes()[0]) });
59 }
60 } catch (Throwable e) {
61 log.debug("Could not set property: "+name+", value: "+value);
62 }
63 }
64
65 private static Object convert(Object value, Class type) throws URISyntaxException {
66 PropertyEditor editor = PropertyEditorManager.findEditor(type);
67 if( editor != null ) {
68 editor.setAsText(value.toString());
69 return editor.getValue();
70 }
71 if( type == URI.class ) {
72 return new URI(value.toString());
73 }
74 return null;
75 }
76
77 private static Method findSetterMethod(Class clazz, String name) {
78 // Build the method name.
79 name = "set"+name.substring(0,1).toUpperCase()+name.substring(1);
80 Method[] methods = clazz.getMethods();
81 for (int i = 0; i < methods.length; i++) {
82 Method method = methods[i];
83 Class params[] = method.getParameterTypes();
84 if( method.getName().equals(name)
85 && params.length==1
86 && isSettableType(params[0])) {
87 return method;
88 }
89 }
90 return null;
91 }
92
93 private static boolean isSettableType(Class clazz) {
94 if( PropertyEditorManager.findEditor(clazz)!=null )
95 return true;
96 if( clazz == URI.class )
97 return true;
98 return false;
99 }
100
101 }