1 /*
2 * Redistribution and use of this software and associated documentation ("Software"), with or
3 * without modification, are permitted provided that the following conditions are met:
4 *
5 * 1. Redistributions of source code must retain copyright statements and notices. Redistributions
6 * must also contain a copy of this document.
7 *
8 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
9 * conditions and the following disclaimer in the documentation and/or other materials provided with
10 * the distribution.
11 *
12 * 3. The name "Exolab" must not be used to endorse or promote products derived from this Software
13 * without prior written permission of Intalio, Inc. For written permission, please contact
14 * info@exolab.org.
15 *
16 * 4. Products derived from this Software may not be called "Exolab" nor may "Exolab" appear in
17 * their names without prior written permission of Intalio, Inc. Exolab is a registered trademark of
18 * Intalio, Inc.
19 *
20 * 5. Due credit should be given to the Exolab Project (http://www.exolab.org/).
21 *
22 * THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESSED OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
24 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTALIO, INC. OR ITS
25 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
28 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
29 * WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 *
31 * Copyright 1999 (C) Intalio, Inc. All Rights Reserved.
32 *
33 * $Id$
34 */
35 package org.exolab.castor.builder.util;
36
37 import java.util.Enumeration;
38 import java.util.Hashtable;
39
40 import org.exolab.castor.builder.ClassInfoResolver;
41 import org.exolab.castor.builder.info.ClassInfo;
42
43 /**
44 * A class for "caching" ClassInfo's which later need to be resolved (retrieved).
45 *
46 * @author <a href="mailto:kvisco@intalio.com">Keith Visco</a>
47 * @version $Revision$ $Date: 2003-03-03 00:05:44 -0700 (Mon, 03 Mar 2003) $
48 */
49 public class ClassInfoResolverImpl implements ClassInfoResolver {
50 /** ClassInfo cache. */
51 private Hashtable<Object, ClassInfo> _cache = null;
52
53 /**
54 * Default constructor.
55 */
56 public ClassInfoResolverImpl() {
57 _cache = new Hashtable<Object, ClassInfo>();
58 }
59
60 /**
61 * Adds the given Reference to this ClassInfo resolver.
62 *
63 * @param key the key to bind a reference to.
64 * @param classInfo the ClassInfo which is being referenced.
65 */
66 public final void bindReference(final Object key, final ClassInfo classInfo) {
67 if (key == null) {
68 String err = "null passed as argument to ClassInfoResolver#bindReference";
69 throw new NullPointerException(err);
70 }
71 _cache.put(key, classInfo);
72 }
73
74 /**
75 * Returns all the keys used for binding ClassInfo objects.
76 *
77 * @return an Enumeration over the keys using for binding ClassInfo objects.
78 */
79 public final Enumeration<?> keys() {
80 return _cache.keys();
81 }
82
83 /**
84 * Returns the ClassInfo which has been bound to the given key.
85 *
86 * @param key the object to which the ClassInfo has been bound.
87 * @return the ClassInfo which has been bound to the given key.
88 */
89 public final ClassInfo resolve(final Object key) {
90 return _cache.get(key);
91 }
92
93 }