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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  }