1/*
2 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25package com.sun.beans.finder;
26
27import java.beans.PersistenceDelegate;
28import java.util.HashMap;
29import java.util.Map;
30
31/**
32 * This is utility class that provides functionality
33 * to find a {@link PersistenceDelegate} for a JavaBean specified by its type.
34 *
35 * @since 1.7
36 *
37 * @author Sergey A. Malenkov
38 */
39public final class PersistenceDelegateFinder
40        extends InstanceFinder<PersistenceDelegate> {
41
42    private final Map<Class<?>, PersistenceDelegate> registry;
43
44    public PersistenceDelegateFinder() {
45        super(PersistenceDelegate.class, true, "PersistenceDelegate");
46        this.registry = new HashMap<Class<?>, PersistenceDelegate>();
47    }
48
49    public void register(Class<?> type, PersistenceDelegate delegate) {
50        synchronized (this.registry) {
51            if (delegate != null) {
52                this.registry.put(type, delegate);
53            }
54            else {
55                this.registry.remove(type);
56            }
57        }
58    }
59
60    @Override
61    public PersistenceDelegate find(Class<?> type) {
62        PersistenceDelegate delegate;
63        synchronized (this.registry) {
64            delegate = this.registry.get(type);
65        }
66        return (delegate != null) ? delegate : super.find(type);
67    }
68}
69