01: /* Copyright (C) 2004 - 2007 db4objects Inc. http://www.db4o.com
02:
03: This file is part of the db4o open source object database.
04:
05: db4o is free software; you can redistribute it and/or modify it under
06: the terms of version 2 of the GNU General Public License as published
07: by the Free Software Foundation and as clarified by db4objects' GPL
08: interpretation policy, available at
09: 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 _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 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 exc) {
63: return false;
64: }
65: }
66: }
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