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Java > Open Source Codes > com > db4o > defragment > AvailableClassFilter


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.defragment;
22
23 import com.db4o.ext.*;
24
25 /**
26  * Filter that accepts only StoredClass instances whose corresponding Java
27  * class is currently known.
28  * @sharpen.ignore
29  */
30 public class AvailableClassFilter implements StoredClassFilter {
31     
32     private ClassLoader JavaDoc _loader;
33
34     /**
35      * Will accept only classes that are known to the classloader that loaded
36      * this class.
37      */
38     public AvailableClassFilter() {
39         this(AvailableClassFilter.class.getClassLoader());
40     }
41
42     /**
43      * Will accept only classes that are known to the given classloader.
44      *
45      * @param loader The classloader to check class names against
46      */
47     public AvailableClassFilter(ClassLoader JavaDoc loader) {
48         _loader = loader;
49     }
50
51     /**
52      * Will accept only classes whose corresponding platform class is known
53      * to the configured classloader.
54      *
55      * @param storedClass The YapClass instance to be checked
56      * @return true if the corresponding platform class is known to the configured classloader, false otherwise
57      */
58     public boolean accept(StoredClass storedClass) {
59         try {
60             _loader.loadClass(storedClass.getName());
61             return true;
62         } catch (ClassNotFoundException JavaDoc exc) {
63             return false;
64         }
65     }
66 }
67
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