ORBVersionFactory.java

/*
 * Copyright (c) 2000, 2003, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package org.jboss.com.sun.corba.se.spi.orb;

import org.jboss.com.sun.corba.se.impl.orb.ORBVersionImpl;
import org.omg.CORBA.portable.InputStream;

public class ORBVersionFactory
{
    private ORBVersionFactory()
    {
    };

    public static ORBVersion getFOREIGN()
    {
        return ORBVersionImpl.FOREIGN;
    }

    public static ORBVersion getOLD()
    {
        return ORBVersionImpl.OLD;
    }

    public static ORBVersion getNEW()
    {
        return ORBVersionImpl.NEW;
    }

    public static ORBVersion getJDK1_3_1_01()
    {
        return ORBVersionImpl.JDK1_3_1_01;
    }

    public static ORBVersion getNEWER()
    {
        return ORBVersionImpl.NEWER;
    }

    public static ORBVersion getPEORB()
    {
        return ORBVersionImpl.PEORB;
    }

    /**
     * Return the current version of this ORB
     */
    public static ORBVersion getORBVersion()
    {
        return ORBVersionImpl.PEORB;
    }

    public static ORBVersion create(InputStream is)
    {
        byte value = is.read_octet();
        return byteToVersion(value);
    }

    private static ORBVersion byteToVersion(byte value)
    {
        /*
         * Throwing an exception here would cause this version to be incompatible with future versions of the ORB, to
         * the point that this version could not even unmarshal objrefs from a newer version that uses extended
         * versioning. Therefore, we will simply treat all unknown versions as the latest version. if (value < 0) throw
         * new INTERNAL() ;
         */

        /**
         * Update: If we treat all unknown versions as the latest version then when we send an IOR with a PEORB version
         * to an ORB that doesn't know the PEORB version it will treat it as whatever its idea of the latest version is.
         * Then, if that IOR is sent back to the server and compared with the original the equality check will fail
         * because the versions will be different.
         * 
         * Instead, just capture the version bytes.
         */

        switch (value)
        {
            case ORBVersion.FOREIGN :
                return ORBVersionImpl.FOREIGN;
            case ORBVersion.OLD :
                return ORBVersionImpl.OLD;
            case ORBVersion.NEW :
                return ORBVersionImpl.NEW;
            case ORBVersion.JDK1_3_1_01 :
                return ORBVersionImpl.JDK1_3_1_01;
            case ORBVersion.NEWER :
                return ORBVersionImpl.NEWER;
            case ORBVersion.PEORB :
                return ORBVersionImpl.PEORB;
            default :
                return new ORBVersionImpl(value);
        }
    }
}