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  */
  25 package com.sun.corba.se.impl.ior.iiop;
  26 
  27 import org.omg.CORBA_2_3.portable.OutputStream;
  28 
  29 import com.sun.corba.se.impl.orbutil.ORBConstants;
  30 import com.sun.corba.se.impl.orbutil.ORBUtility;
  31 import com.sun.corba.se.impl.protocol.giopmsgheaders.Message;
  32 
  33 import com.sun.corba.se.spi.orb.ORB;
  34 import 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  */
  45 public 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 }