/*
    *  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.api.ldap.extras.controls.syncrepl_impl;
  
  
  import java.nio.ByteBuffer;
  
  import org.apache.directory.api.asn1.Asn1Object;
  import org.apache.directory.api.asn1.DecoderException;
  import org.apache.directory.api.asn1.EncoderException;
  import org.apache.directory.api.asn1.ber.Asn1Decoder;
  import org.apache.directory.api.asn1.ber.tlv.BerValue;
  import org.apache.directory.api.asn1.ber.tlv.TLV;
  import org.apache.directory.api.asn1.ber.tlv.UniversalTag;
  import org.apache.directory.api.i18n.I18n;
  import org.apache.directory.api.ldap.codec.api.ControlDecorator;
  import org.apache.directory.api.ldap.codec.api.LdapApiService;
  import org.apache.directory.api.ldap.extras.controls.syncrepl.syncState.SyncStateTypeEnum;
  import org.apache.directory.api.ldap.extras.controls.syncrepl.syncState.SyncStateValue;
  import org.apache.directory.api.ldap.extras.controls.syncrepl.syncState.SyncStateValueImpl;
  
  
  /**
   * A syncStateValue object, as defined in RFC 4533
   *
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  public class SyncStateValueDecorator extends ControlDecorator<SyncStateValue> implements SyncStateValue
  {
      /** Global length for the control */
      private int syncStateSeqLength;
  
      /** An instance of this decoder */
      private static final Asn1Decoder DECODER = new Asn1Decoder();
  
  
      /**
       * Creates a new instance of SyncStateValueDecorator.
       * 
       * @param codec The LDAP Service to use
       */
      public SyncStateValueDecorator( LdapApiService codec )
      {
          super( codec, new SyncStateValueImpl() );
      }
  
  
      /**
       * Creates a new instance of SyncStateValueDecorator.
       * 
       * @param codec The LDAP Service to use
       * @param value The SyncState value to use
       */
      public SyncStateValueDecorator( LdapApiService codec, SyncStateValue value )
      {
          super( codec, value );
      }
  
  
      /**
       * {@inheritDoc}
       */
      @Override
      public byte[] getCookie()
      {
          return getDecorated().getCookie();
      }
  
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void setCookie( byte[] cookie )
      {
          getDecorated().setCookie( cookie );
      }
  
  
      /**
       * {@inheritDoc}
       */
     @Override
     public SyncStateTypeEnum getSyncStateType()
     {
         return getDecorated().getSyncStateType();
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void setSyncStateType( SyncStateTypeEnum syncStateType )
     {
         getDecorated().setSyncStateType( syncStateType );
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public byte[] getEntryUUID()
     {
         return getDecorated().getEntryUUID();
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public void setEntryUUID( byte[] entryUUID )
     {
         getDecorated().setEntryUUID( entryUUID );
     }
 
 
     /**
      * Compute the SyncStateValue length.
      * <br>
      * SyncStateValue :
      * <pre>
      * 0x30 L1
      *  |
      *  +--&gt; 0x0A 0x01 [0x00|0x01|0x02|0x03] (type)
      * [+--&gt; 0x04 L2 abcd...                 (entryUUID)
      * [+--&gt; 0x04 L3 abcd...                 (cookie)
      * </pre>
      * 
      * @return The computed length
      */
     @Override
     public int computeLength()
     {
         // The sync state type length
         syncStateSeqLength = 1 + 1 + 1;
 
         syncStateSeqLength += 1 + TLV.getNbBytes( getEntryUUID().length ) + getEntryUUID().length;
 
         // The cookie length, if we have a cookie
         if ( getCookie() != null )
         {
             syncStateSeqLength += 1 + TLV.getNbBytes( getCookie().length ) + getCookie().length;
         }
 
         valueLength = 1 + TLV.getNbBytes( syncStateSeqLength ) + syncStateSeqLength;
 
         return valueLength;
     }
 
 
     /**
      * Encode the SyncStateValue control
      *
      * @param buffer The encoded sink
      * @return A ByteBuffer that contains the encoded PDU
      * @throws EncoderException If anything goes wrong.
      */
     @Override
     public ByteBuffer encode( ByteBuffer buffer ) throws EncoderException
     {
         if ( buffer == null )
         {
             throw new EncoderException( I18n.err( I18n.ERR_04023 ) );
         }
 
         // Encode the SEQ
         buffer.put( UniversalTag.SEQUENCE.getValue() );
         buffer.put( TLV.getBytes( syncStateSeqLength ) );
 
         // The mode
         buffer.put( UniversalTag.ENUMERATED.getValue() );
         buffer.put( ( byte ) 0x01 );
         buffer.put( BerValue.getBytes( getSyncStateType().getValue() ) );
 
         // the entryUUID
         BerValue.encode( buffer, getEntryUUID() );
 
         // The cookie
         if ( getCookie() != null )
         {
             BerValue.encode( buffer, getCookie() );
         }
 
         return buffer;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public byte[] getValue()
     {
         if ( value == null )
         {
             try
             {
                 computeLength();
                 ByteBuffer buffer = ByteBuffer.allocate( valueLength );
 
                 // Encode the SEQ
                 buffer.put( UniversalTag.SEQUENCE.getValue() );
                 buffer.put( TLV.getBytes( syncStateSeqLength ) );
 
                 // The mode
                 buffer.put( UniversalTag.ENUMERATED.getValue() );
                 buffer.put( ( byte ) 0x01 );
                 buffer.put( BerValue.getBytes( getSyncStateType().getValue() ) );
 
                 // the entryUUID
                 BerValue.encode( buffer, getEntryUUID() );
 
                 // The cookie
                 if ( getCookie() != null )
                 {
                     BerValue.encode( buffer, getCookie() );
                 }
 
                 value = buffer.array();
             }
             catch ( Exception e )
             {
                 return null;
             }
         }
 
         return value;
     }
 
 
     /**
      * {@inheritDoc}
      */
     @Override
     public Asn1Object decode( byte[] controlBytes ) throws DecoderException
     {
         ByteBuffer bb = ByteBuffer.wrap( controlBytes );
         SyncStateValueContainer container = new SyncStateValueContainer( this );
         DECODER.decode( bb, container );
         return this;
     }
 }