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Java > Open Source Codes > org > objectstyle > cayenne > client > ClientEntityResolver


1 /* ====================================================================
2  *
3  * The ObjectStyle Group Software License, version 1.1
4  * ObjectStyle Group - http://objectstyle.org/
5  *
6  * Copyright (c) 2002-2005, Andrei (Andrus) Adamchik and individual authors
7  * of the software. All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
15  *
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in
18  * the documentation and/or other materials provided with the
19  * distribution.
20  *
21  * 3. The end-user documentation included with the redistribution, if any,
22  * must include the following acknowlegement:
23  * "This product includes software developed by independent contributors
24  * and hosted on ObjectStyle Group web site (http://objectstyle.org/)."
25  * Alternately, this acknowlegement may appear in the software itself,
26  * if and wherever such third-party acknowlegements normally appear.
27  *
28  * 4. The names "ObjectStyle Group" and "Cayenne" must not be used to endorse
29  * or promote products derived from this software without prior written
30  * permission. For written permission, email
31  * "andrus at objectstyle dot org".
32  *
33  * 5. Products derived from this software may not be called "ObjectStyle"
34  * or "Cayenne", nor may "ObjectStyle" or "Cayenne" appear in their
35  * names without prior written permission.
36  *
37  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40  * DISCLAIMED. IN NO EVENT SHALL THE OBJECTSTYLE GROUP OR
41  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48  * SUCH DAMAGE.
49  * ====================================================================
50  *
51  * This software consists of voluntary contributions made by many
52  * individuals and hosted on ObjectStyle Group web site. For more
53  * information on the ObjectStyle Group, please see
54  * <http://objectstyle.org/>.
55  */

56 package org.objectstyle.cayenne.client;
57
58 import java.io.Serializable JavaDoc;
59 import java.util.Map JavaDoc;
60
61 /**
62  * An object that provides limited mapping information to the client applications.
63  *
64  * @since 1.2
65  * @author Andrus Adamchik
66  */

67 public class ClientEntityResolver implements Serializable JavaDoc {
68
69     protected Map JavaDoc entityNameByClientClass;
70
71     public ClientEntityResolver(Map JavaDoc entityNameByClientClass) {
72         this.entityNameByClientClass = entityNameByClientClass;
73     }
74
75     /**
76      * Returns the name of Cayenne entity for a given object class. If a class is not
77      * mapped, its superclass is checked, all the way to the base class.
78      *
79      * @throws CayenneClientException if a class is not mapped.
80      */

81     public String JavaDoc lookupEntity(Class JavaDoc objectClass) {
82         if (objectClass == null) {
83             throw new CayenneClientException("Null object class.");
84         }
85
86         String JavaDoc entity = doLookupEntity(objectClass);
87
88         if (entity == null) {
89             throw new CayenneClientException("Unmapped class hierarchy: " + objectClass);
90         }
91         return entity;
92     }
93
94     protected String JavaDoc doLookupEntity(Class JavaDoc objectClass) {
95         if (objectClass == null) {
96             return null;
97         }
98
99         String JavaDoc entity = (String JavaDoc) entityNameByClientClass.get(objectClass.getName());
100         return (entity != null) ? entity : doLookupEntity(objectClass.getSuperclass());
101     }
102 }
103
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