01: /*
02: * $Header: /export/home/cvsroot/MyPersonalizerRepository/MyPersonalizer/Subsystems/Kernel/Sources/es/udc/mypersonalizer/kernel/model/repository/sql/plain/ThreadAttachmentManager.java,v 1.1.1.1 2004/03/25 12:08:36 fbellas Exp $
03: * $Revision: 1.1.1.1 $
04: * $Date: 2004/03/25 12:08:36 $
05: *
06: * =============================================================================
07: *
08: * Copyright (c) 2003, The MyPersonalizer Development Group
09: * (http://www.tic.udc.es/~fbellas/mypersonalizer/index.html) at
10: * University Of A Coruna
11: * All rights reserved.
12: *
13: * Redistribution and use in source and binary forms, with or without
14: * modification, are permitted provided that the following conditions are met:
15: *
16: * - Redistributions of source code must retain the above copyright notice,
17: * this list of conditions and the following disclaimer.
18: *
19: * - Redistributions in binary form must reproduce the above copyright notice,
20: * this list of conditions and the following disclaimer in the documentation
21: * and/or other materials provided with the distribution.
22: *
23: * - Neither the name of the University Of A Coruna nor the names of its
24: * contributors may be used to endorse or promote products derived from
25: * this software without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
28: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30: * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
31: * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37: * POSSIBILITY OF SUCH DAMAGE.
38: *
39: */
40:
41: package es.udc.mypersonalizer.kernel.model.repository.sql.plain;
42:
43: import java.util.Map;
44: import java.util.HashMap;
45: import java.util.Collections;
46:
47: /**
48: * This class contains the current thread attachments represented by an
49: * <code>Object</code>.
50: *
51: * @author Fernando Bellas
52: * @since 1.0
53: */
54: public final class ThreadAttachmentManager {
55:
56: /** Disallows creating instances of this class. */
57: private ThreadAttachmentManager() {
58: }
59:
60: /** The thread attachments mapping. */
61: private static Map attachments = Collections
62: .synchronizedMap(new HashMap());
63:
64: /**
65: * Gets the thread attachment if any.
66: *
67: * @return the thread attachment or <code>null</code> if there is no
68: * attachment.
69: */
70: public static Object getAttachment() {
71: return attachments.get(Thread.currentThread());
72: }
73:
74: /**
75: * Sets the thread attachment.
76: *
77: * @param attachment the thread attachment.
78: * @return the previous attachment or <code>null</code> if there is no
79: * previous attachment.
80: */
81: public static Object setAttachment(Object attachment) {
82: return attachments.put(Thread.currentThread(), attachment);
83: }
84:
85: /**
86: * Clears the thread attachment.
87: */
88: public static void clearAttachment() {
89: attachments.remove(Thread.currentThread());
90: }
91: }
|