/*

 * 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

 * particular file as subject to the "Classpath" exception as provided

 *

 * 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.

 *

 */

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

import com.sun.corba.se.spi.orb.ORBVersion ;

import com.sun.corba.se.impl.orb.ORBVersionImpl ;

import org.omg.CORBA.portable.InputStream ;

import org.omg.CORBA.INTERNAL ;

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);

        }

    }

}