001    /*
002     *  Licensed to the Apache Software Foundation (ASF) under one
003     *  or more contributor license agreements.  See the NOTICE file
004     *  distributed with this work for additional information
005     *  regarding copyright ownership.  The ASF licenses this file
006     *  to you under the Apache License, Version 2.0 (the
007     *  "License"); you may not use this file except in compliance
008     *  with the License.  You may obtain a copy of the License at
009     *  
010     *    http://www.apache.org/licenses/LICENSE-2.0
011     *  
012     *  Unless required by applicable law or agreed to in writing,
013     *  software distributed under the License is distributed on an
014     *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015     *  KIND, either express or implied.  See the License for the
016     *  specific language governing permissions and limitations
017     *  under the License. 
018     *  
019     */
020    package org.apache.directory.shared.ldap.codec.controls;
021    
022    
023    import java.nio.ByteBuffer;
024    
025    import org.apache.directory.shared.asn1.AbstractAsn1Object;
026    import org.apache.directory.shared.asn1.codec.EncoderException;
027    
028    
029    /**
030     * 
031     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
032     * @version $Rev$
033     */
034    public class CascadeControlCodec extends AbstractAsn1Object
035    {
036        private static final ByteBuffer EMPTY_BUFFER = ByteBuffer.allocate( 0 );
037    
038        /**
039         * Default constructor
040         *
041         */
042        public CascadeControlCodec()
043        {
044            super();
045        }
046    
047        /**
048         * Returns 0 everytime.
049         */
050        public int computeLength()
051        {
052            return 0;
053        }
054    
055    
056        /**
057         * Encodes the control: does nothing but returns an empty buffer.
058         */
059        public ByteBuffer encode( ByteBuffer buffer ) throws EncoderException
060        {
061            return EMPTY_BUFFER;
062        }
063    }