Java Source: ResourceEnvFactory

001 /*
002  * Copyright 1999,2004 The Apache Software Foundation.
003  * 
004  * Licensed under the Apache License, Version 2.0 (the "License");
005  * you may not use this file except in compliance with the License.
006  * You may obtain a copy of the License at
007  * 
008  *      http://www.apache.org/licenses/LICENSE-2.0
009  * 
010  * Unless required by applicable law or agreed to in writing, software
011  * distributed under the License is distributed on an "AS IS" BASIS,
012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013  * See the License for the specific language governing permissions and
014  * limitations under the License.
015  */ 
016 
017 
018 package org.apache.naming.factory;
019 
020 import java.util.Hashtable;
021 import javax.naming.Name;
022 import javax.naming.Context;
023 import javax.naming.NamingException;
024 import javax.naming.Reference;
025 import javax.naming.RefAddr;
026 import javax.naming.spi.ObjectFactory;
027 import org.apache.naming.ResourceEnvRef;
028 
029 /**
030  * Object factory for Resources env.
031  * 
032  * @author Remy Maucherat
033  * @version $Revision: 1.2 $ $Date: 2004/02/27 14:58:54 $
034  */
035 
036 public class ResourceEnvFactory
037     implements ObjectFactory {
038 
039 
040     // ----------------------------------------------------------- Constructors
041 
042 
043     // -------------------------------------------------------------- Constants
044 
045 
046     // ----------------------------------------------------- Instance Variables
047 
048 
049     // --------------------------------------------------------- Public Methods
050 
051 
052     // -------------------------------------------------- ObjectFactory Methods
053 
054 
055     /**
056      * Crete a new Resource env instance.
057      * 
058      * @param obj The reference object describing the DataSource
059      */
060     public Object getObjectInstance(Object obj, Name name, Context nameCtx,
061                                     Hashtable environment)
062         throws Exception {
063         
064         if (obj instanceof ResourceEnvRef) {
065             Reference ref = (Reference) obj;
066             ObjectFactory factory = null;
067             RefAddr factoryRefAddr = ref.get(Constants.FACTORY);
068             if (factoryRefAddr != null) {
069                 // Using the specified factory
070                 String factoryClassName = 
071                     factoryRefAddr.getContent().toString();
072                 // Loading factory
Rate073                 ClassLoader tcl = 
074                     Thread.currentThread().getContextClassLoader();
075                 Class factoryClass = null;
076                 if (tcl != null) {
077                     try {
078                         factoryClass = tcl.loadClass(factoryClassName);
079                     } catch(ClassNotFoundException e) {
080                     }
081                 } else {
082                     try {
083                         factoryClass = Class.forName(factoryClassName);
084                     } catch(ClassNotFoundException e) {
085                     }
086                 }
087                 if (factoryClass != null) {
088                     try {
089                         factory = (ObjectFactory) factoryClass.newInstance();
090                     } catch(Throwable t) {
091                     }
092                 }
093             }
094             // Note: No defaults here
095             if (factory != null) {
096                 return factory.getObjectInstance
097                     (obj, name, nameCtx, environment);
098             } else {
099                 throw new NamingException
100                     ("Cannot create resource instance");
101             }
102         }
103 
104         return null;
105 
106     }
107 
108 
109 }
Class: org.apache.naming.factory.ResourceEnvFactory ©
