1 /**
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.activemq.jndi;
18
19 import java.util.Enumeration;
20 import java.util.Hashtable;
21 import java.util.Properties;
22
23 import javax.naming.Context;
24 import javax.naming.Name;
25 import javax.naming.NamingException;
26 import javax.naming.Reference;
27 import javax.naming.StringRefAddr;
28 import javax.naming.spi.ObjectFactory;
29
30 import org.apache.commons.logging.Log;
31 import org.apache.commons.logging.LogFactory;
32
33 /**
34 * Converts objects implementing JNDIStorable into a property fields so they can
35 * be stored and regenerated from JNDI
36 */
37 public class JNDIReferenceFactory implements ObjectFactory {
38
39 static Log log = LogFactory.getLog(JNDIReferenceFactory.class);
40
41 /**
42 * This will be called by a JNDIprovider when a Reference is retrieved from
43 * a JNDI store - and generates the orignal instance
44 *
45 * @param object the Reference object
46 * @param name the JNDI name
47 * @param nameCtx the context
48 * @param environment the environment settings used by JNDI
49 * @return the instance built from the Reference object
50 * @throws Exception if building the instance from Reference fails (usually
51 * class not found)
52 */
53 public Object getObjectInstance(Object object, Name name, Context nameCtx, Hashtable environment) throws Exception {
54 Object result = null;
55 if (object instanceof Reference) {
56 Reference reference = (Reference)object;
57
58 if (log.isTraceEnabled()) {
59 log.trace("Getting instance of " + reference.getClassName());
60 }
61
62 Class theClass = loadClass(this, reference.getClassName());
63 if (JNDIStorableInterface.class.isAssignableFrom(theClass)) {
64
65 JNDIStorableInterface store = (JNDIStorableInterface)theClass.newInstance();
66 Properties properties = new Properties();
67 for (Enumeration iter = reference.getAll(); iter.hasMoreElements();) {
68
69 StringRefAddr addr = (StringRefAddr)iter.nextElement();
70 properties.put(addr.getType(), (addr.getContent() == null) ? "" : addr.getContent());
71
72 }
73 store.setProperties(properties);
74 result = store;
75 }
76 } else {
77 log.error("Object " + object + " is not a reference - cannot load");
78 throw new RuntimeException("Object " + object + " is not a reference");
79 }
80 return result;
81 }
82
83 /**
84 * Create a Reference instance from a JNDIStorable object
85 *
86 * @param instanceClassName
87 * @param po
88 * @return
89 * @throws NamingException
90 */
91
92 public static Reference createReference(String instanceClassName, JNDIStorableInterface po) throws NamingException {
93 if (log.isTraceEnabled()) {
94 log.trace("Creating reference: " + instanceClassName + "," + po);
95 }
96 Reference result = new Reference(instanceClassName, JNDIReferenceFactory.class.getName(), null);
97 try {
98 Properties props = po.getProperties();
99 for (Enumeration iter = props.propertyNames(); iter.hasMoreElements();) {
100 String key = (String)iter.nextElement();
101 String value = props.getProperty(key);
102 javax.naming.StringRefAddr addr = new javax.naming.StringRefAddr(key, value);
103 result.add(addr);
104 }
105 } catch (Exception e) {
106 log.error(e.getMessage(), e);
107 throw new NamingException(e.getMessage());
108 }
109 return result;
110 }
111
112 /**
113 * Retrieve the class loader for a named class
114 *
115 * @param thisObj
116 * @param className
117 * @return
118 * @throws ClassNotFoundException
119 */
120
121 public static Class loadClass(Object thisObj, String className) throws ClassNotFoundException {
122 // tryu local ClassLoader first.
123 ClassLoader loader = thisObj.getClass().getClassLoader();
124 Class theClass;
125 if (loader != null) {
126 theClass = loader.loadClass(className);
127 } else {
128 // Will be null in jdk1.1.8
129 // use default classLoader
130 theClass = Class.forName(className);
131 }
132 return theClass;
133 }
134
135 }
Save This Page