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1 /*
2  * The Apache Software License, Version 1.1
3  *
4  *
5  * Copyright (c) 2000 The Apache Software Foundation. All rights
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9  * modification, are permitted provided that the following conditions
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13  * notice, this list of conditions and the following disclaimer.
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright
16  * notice, this list of conditions and the following disclaimer in
17  * the documentation and/or other materials provided with the
18  * distribution.
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20  * 3. The end-user documentation included with the redistribution,
21  * if any, must include the following acknowledgment:
22  * "This product includes software developed by the
23  * Apache Software Foundation (http://www.apache.org/)."
24  * Alternately, this acknowledgment may appear in the software itself,
25  * if and wherever such third-party acknowledgments normally appear.
26  *
27  * 4. The names "SOAP" and "Apache Software Foundation" must
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29  * software without prior written permission. For written
30  * permission, please contact apache@apache.org.
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32  * 5. Products derived from this software may not be called "Apache",
33  * nor may "Apache" appear in their name, without prior written
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50  * This software consists of voluntary contributions made by many
51  * individuals on behalf of the Apache Software Foundation and was
52  * originally based on software copyright (c) 2000, International
53  * Business Machines, Inc., http://www.apache.org. For more
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55  * <http://www.apache.org/>.
56  */
57
58 /* $Id: ObjectRegistry.java,v 1.3 2000/09/01 03:53:03 sanjiva Exp $ */
59
60 package org.apache.soap.util;
61
62 import java.util.*;
63
64 /**
65  * The <em>ObjectRegistry</em> is used to do name-to-object reference lookups.
66  * If an <em>ObjectRegistry</em> is passed as a constructor argument, then this
67  * <em>ObjectRegistry</em> will be a cascading registry: when a lookup is
68  * invoked, it will first look in its own table for a name, and if it's not
69  * there, it will cascade to the parent <em>ObjectRegistry</em>.
70  * All registration is always local. [??]
71  *
72  * @version $Revision: 1.3 $
73  * @author Sanjiva Weerawarana
74  * @author Matthew J. Duftler
75  */
76 public class ObjectRegistry {
77   Hashtable reg = new Hashtable ();
78   ObjectRegistry parent = null;
79
80   public ObjectRegistry () {
81   }
82
83   public ObjectRegistry (ObjectRegistry parent) {
84     this.parent = parent;
85   }
86
87   // register an object
88 public void register (String JavaDoc name, Object JavaDoc obj) {
89     reg.put (name, obj);
90   }
91
92   // unregister an object (silent if unknown name)
93 public void unregister (String JavaDoc name) {
94     reg.remove (name);
95   }
96
97   // lookup an object: cascade up if needed
98 public Object JavaDoc lookup (String JavaDoc name) throws IllegalArgumentException JavaDoc {
99     Object JavaDoc obj = reg.get (name);
100
101     if (obj == null && parent != null) {
102       obj = parent.lookup (name);
103     }
104
105     if (obj == null) {
106       throw new IllegalArgumentException JavaDoc ("object '" + name + "' not in registry");
107     }
108
109     return obj;
110   }
111 }
112
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