1 /*
2 * Redistribution and use of this software and associated documentation
3 * ("Software"), with or without modification, are permitted provided
4 * that the following conditions are met:
5 *
6 * 1. Redistributions of source code must retain copyright
7 * statements and notices. Redistributions must also contain a
8 * copy of this document.
9 *
10 * 2. Redistributions in binary form must reproduce the
11 * above copyright notice, this list of conditions and the
12 * following disclaimer in the documentation and/or other
13 * materials provided with the distribution.
14 *
15 * 3. The name "Exolab" must not be used to endorse or promote
16 * products derived from this Software without prior written
17 * permission of Intalio, Inc. For written permission,
18 * please contact info@exolab.org.
19 *
20 * 4. Products derived from this Software may not be called "Exolab"
21 * nor may "Exolab" appear in their names without prior written
22 * permission of Intalio, Inc. Exolab is a registered
23 * trademark of Intalio, Inc.
24 *
25 * 5. Due credit should be given to the Exolab Project
26 * (http://www.exolab.org/).
27 *
28 * THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS
29 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
30 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
31 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
32 * INTALIO, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
33 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
34 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
35 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
37 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
39 * OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Copyright 1999 (C) Intalio, Inc. All Rights Reserved.
42 *
43 * $Id$
44 */
45 package org.exolab.castor.builder.util;
46
47 import java.util.Enumeration;
48 import java.util.Hashtable;
49
50 import org.exolab.castor.builder.ClassInfoResolver;
51 import org.exolab.castor.builder.info.ClassInfo;
52
53 /**
54 * A class for "caching" ClassInfo's which later need to be resolved
55 * (retrieved).
56 *
57 * @author <a href="mailto:kvisco@intalio.com">Keith Visco</a>
58 * @version $Revision$ $Date: 2003-03-03 00:05:44 -0700 (Mon, 03 Mar 2003) $
59 */
60 public class ClassInfoResolverImpl implements ClassInfoResolver {
61 /** ClassInfo cache. */
62 private Hashtable<Object, ClassInfo> _cache = null;
63
64 /**
65 * Default constructor.
66 */
67 public ClassInfoResolverImpl() {
68 _cache = new Hashtable<Object, ClassInfo>();
69 }
70
71 /**
72 * Adds the given Reference to this ClassInfo resolver.
73 *
74 * @param key the key to bind a reference to.
75 * @param classInfo the ClassInfo which is being referenced.
76 */
77 public final void bindReference(final Object key, final ClassInfo classInfo) {
78 if (key == null) {
79 String err = "null passed as argument to ClassInfoResolver#bindReference";
80 throw new NullPointerException(err);
81 }
82 _cache.put(key, classInfo);
83 }
84
85 /**
86 * Returns all the keys used for binding ClassInfo objects.
87 *
88 * @return an Enumeration over the keys using for binding ClassInfo objects.
89 */
90 public final Enumeration<?> keys() {
91 return _cache.keys();
92 }
93
94 /**
95 * Returns the ClassInfo which has been bound to the given key.
96 *
97 * @param key the object to which the ClassInfo has been bound.
98 * @return the ClassInfo which has been bound to the given key.
99 */
100 public final ClassInfo resolve(final Object key) {
101 return _cache.get(key);
102 }
103
104 }