JavaSerializationComponent.java revision 608:7e06bf1dcb09 
1/*
2 * Copyright (c) 2004, 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.corba.se.impl.ior.iiop;
26
27import org.omg.CORBA_2_3.portable.OutputStream;
28
29import com.sun.corba.se.impl.orbutil.ORBConstants;
30import com.sun.corba.se.impl.orbutil.ORBUtility;
31import com.sun.corba.se.impl.protocol.giopmsgheaders.Message;
32
33import com.sun.corba.se.spi.orb.ORB;
34import com.sun.corba.se.spi.ior.TaggedComponentBase;
35
36/**
37 * Tagged component that contains a value that indicates the Java
38 * serialization version supported by the ORB.
39 *
40 * ORB Java serialization uses IIOP as the transport protocol, but uses
41 * Java serialization mechanism and its accompanying encodings, instead
42 * of IIOP CDR serialization mechanism. Java serialization is generally
43 * observed to be faster than CDR.
44 */
45public class JavaSerializationComponent extends TaggedComponentBase {
46
47    private byte version;
48
49    private static JavaSerializationComponent singleton;
50
51    public static JavaSerializationComponent singleton() {
52        if (singleton == null) {
53            synchronized (JavaSerializationComponent.class) {
54                singleton =
55                    new JavaSerializationComponent(Message.JAVA_ENC_VERSION);
56            }
57        }
58        return singleton;
59    }
60
61    public JavaSerializationComponent(byte version) {
62        this.version = version;
63    }
64
65    public byte javaSerializationVersion() {
66        return this.version;
67    }
68
69    public void writeContents(OutputStream os) {
70        os.write_octet(version);
71    }
72
73    public int getId() {
74        return ORBConstants.TAG_JAVA_SERIALIZATION_ID;
75    }
76
77    public boolean equals(Object obj) {
78        if (!(obj instanceof JavaSerializationComponent)) {
79            return false;
80        }
81        JavaSerializationComponent other = (JavaSerializationComponent) obj;
82        return this.version == other.version;
83    }
84
85    public int hashCode() {
86        return this.version;
87    }
88}
89