/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *  
 *    http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License. 
 *  
 */
package org.apache.directory.server.kerberos.changepwd.messages;


import java.nio.ByteBuffer;

import org.apache.directory.api.asn1.EncoderException;


/**
 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
 */
public abstract class AbstractPasswordMessage
{
    /**
     * ChangePassword protocol version number.
     */
    public static final short PVNO = ( short ) 0xFF80;

    public static final short OLD_PVNO = 1;

    static final int HEADER_LENGTH = 6;

    private short versionNumber;


    protected AbstractPasswordMessage( short versionNumber )
    {
        this.versionNumber = versionNumber;
    }


    /**
     * Returns the version number.
     *
     * @return The version number.
     */
    public short getVersionNumber()
    {
        return versionNumber;
    }


    public abstract short computeLength();


    public abstract ByteBuffer encode( ByteBuffer buf ) throws EncoderException;
}