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Java > Open Source Codes > com > db4o > config > TypeAlias


1 /* Copyright (C) 2004 - 2006 db4objects Inc. http://www.db4o.com
2
3 This file is part of the db4o open source object database.
4
5 db4o is free software; you can redistribute it and/or modify it under
6 the terms of version 2 of the GNU General Public License as published
7 by the Free Software Foundation and as clarified by db4objects' GPL
8 interpretation policy, available at
9 http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10 Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11 Suite 350, San Mateo, CA 94403, USA.
12
13 db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
17
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 package com.db4o.config;
22
23 /**
24  * a simple Alias for a single Class or Type, using #equals() on
25  * the names in the resolve method.
26  * <br><br>See {@link Alias} for concrete examples.
27  */
28 public class TypeAlias implements Alias {
29
30     private final String JavaDoc _storedType;
31     
32     private final String JavaDoc _runtimeType;
33
34     /**
35      * pass the stored name as the first
36      * parameter and the desired runtime name as the second parameter.
37      */
38     public TypeAlias(String JavaDoc storedType, String JavaDoc runtimeType) {
39         if (null == storedType || null == runtimeType) throw new IllegalArgumentException JavaDoc();
40         _storedType = storedType;
41         _runtimeType = runtimeType;
42     }
43
44     /**
45      * returns the stored type name if the alias was written for the passed runtime type name
46      */
47     public String JavaDoc resolveRuntimeName(String JavaDoc runtimeTypeName) {
48         return _runtimeType.equals(runtimeTypeName)
49             ? _storedType
50             : null;
51     }
52     
53     /**
54      * returns the runtime type name if the alias was written for the passed stored type name
55      */
56     public String JavaDoc resolveStoredName(String JavaDoc storedTypeName) {
57         return _storedType.equals(storedTypeName)
58         ? _runtimeType
59         : null;
60     }
61
62 }
63
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