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Java > Open Source Codes > org > apache > geronimo > naming > java > RootContext


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
18 package org.apache.geronimo.naming.java;
19
20 import java.util.Collections JavaDoc;
21
22 import javax.naming.Context JavaDoc;
23 import javax.naming.NameNotFoundException JavaDoc;
24 import javax.naming.NamingException JavaDoc;
25
26 import org.apache.xbean.naming.context.ImmutableContext;
27
28 /**
29  * The root context for the java: namespace.
30  * Automatically handles switching the "java:comp" sub-context to the
31  * appropriate one for the current thread.
32  *
33  * @version $Rev: 476049 $ $Date: 2006-11-16 23:35:17 -0500 (Thu, 16 Nov 2006) $
34  */
35 public class RootContext extends ImmutableContext {
36     private static InheritableThreadLocal JavaDoc compContext = new InheritableThreadLocal JavaDoc();
37
38     public RootContext() throws NamingException JavaDoc {
39         super(Collections.EMPTY_MAP);
40     }
41
42     public Object JavaDoc lookup(String JavaDoc name) throws NamingException JavaDoc {
43         if (name.startsWith("java:")) {
44             name = name.substring(5);
45             if (name.length() == 0) {
46                 return this;
47             }
48
49             Context JavaDoc compCtx = (Context JavaDoc) compContext.get();
50             if (compCtx == null) {
51                 // the component context was not set for this thread
52 throw new NameNotFoundException JavaDoc(name);
53             }
54
55             if ("comp".equals(name)) {
56                 return compCtx;
57             } else if (name.startsWith("comp/")) {
58                 return compCtx.lookup(name.substring(5));
59             } else if ("/comp".equals(name)) {
60                 return compCtx;
61             } else if (name.startsWith("/comp/")) {
62                 return compCtx.lookup(name.substring(6));
63             } else {
64                 throw new NameNotFoundException JavaDoc("Unrecognized name, does not start with expected 'comp': " + name);
65             }
66         }
67         return super.lookup(name);
68     }
69
70     /**
71      * Set the component context for the current thread. This will be returned
72      * for all lookups of "java:comp"
73      * @param ctx the current components context
74      */
75     public static void setComponentContext(Context JavaDoc ctx) {
76         compContext.set(ctx);
77     }
78
79     /**
80      * Get the component context for the current thread.
81      * @return the current components context
82      */
83     public static Context JavaDoc getComponentContext() {
84         return (Context JavaDoc) compContext.get();
85     }
86 }
87
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