| /* |
| * 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.codec.controls.search.entryChange; |
| |
| |
| 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.model.message.controls.ChangeType; |
| import org.apache.directory.api.ldap.model.message.controls.EntryChange; |
| import org.apache.directory.api.ldap.model.message.controls.EntryChangeImpl; |
| import org.apache.directory.api.ldap.model.name.Dn; |
| import org.apache.directory.api.util.Strings; |
| |
| |
| /** |
| * An EntryChange implementation, that wraps and decorates the Control with codec |
| * specific functionality. |
| * |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| public class EntryChangeDecorator extends ControlDecorator<EntryChange> implements EntryChange |
| { |
| |
| public static final int UNDEFINED_CHANGE_NUMBER = -1; |
| |
| /** A temporary storage for the previous Dn */ |
| private byte[] previousDnBytes = null; |
| |
| /** The entry change global length */ |
| private int eccSeqLength; |
| |
| /** An instance of this decoder */ |
| private static final Asn1Decoder DECODER = new Asn1Decoder(); |
| |
| |
| /** |
| * Creates a new instance of EntryChangeDecoder wrapping a newly created |
| * EntryChange Control object. |
| */ |
| public EntryChangeDecorator( LdapApiService codec ) |
| { |
| super( codec, new EntryChangeImpl() ); |
| } |
| |
| |
| /** |
| * Creates a new instance of EntryChangeDecorator wrapping the supplied |
| * EntryChange Control. |
| * |
| * @param control The EntryChange Control to be decorated. |
| */ |
| public EntryChangeDecorator( LdapApiService codec, EntryChange control ) |
| { |
| super( codec, control ); |
| } |
| |
| |
| /** |
| * Internally used to not have to cast the decorated Control. |
| * |
| * @return the decorated Control. |
| */ |
| private EntryChange getEntryChange() |
| { |
| return ( EntryChange ) getDecorated(); |
| } |
| |
| |
| /** |
| * Compute the EntryChangeControl length |
| * |
| * 0x30 L1 |
| * | |
| * +--> 0x0A 0x0(1-4) [1|2|4|8] (changeType) |
| * [+--> 0x04 L2 previousDN] |
| * [+--> 0x02 0x0(1-4) [0..2^63-1] (changeNumber)] |
| */ |
| public int computeLength() |
| { |
| int changeTypesLength = 1 + 1 + 1; |
| |
| int previousDnLength = 0; |
| int changeNumberLength = 0; |
| |
| if ( getPreviousDn() != null ) |
| { |
| previousDnBytes = Strings.getBytesUtf8( getPreviousDn().getName() ); |
| previousDnLength = 1 + TLV.getNbBytes( previousDnBytes.length ) + previousDnBytes.length; |
| } |
| |
| if ( getChangeNumber() != UNDEFINED_CHANGE_NUMBER ) |
| { |
| changeNumberLength = 1 + 1 + BerValue.getNbBytes( getChangeNumber() ); |
| } |
| |
| eccSeqLength = changeTypesLength + previousDnLength + changeNumberLength; |
| valueLength = 1 + TLV.getNbBytes( eccSeqLength ) + eccSeqLength; |
| |
| return valueLength; |
| } |
| |
| |
| /** |
| * Encodes the entry change control. |
| * |
| * @param buffer The encoded sink |
| * @return A ByteBuffer that contains the encoded PDU |
| * @throws EncoderException If anything goes wrong. |
| */ |
| public ByteBuffer encode( ByteBuffer buffer ) throws EncoderException |
| { |
| if ( buffer == null ) |
| { |
| throw new EncoderException( I18n.err( I18n.ERR_04023 ) ); |
| } |
| |
| buffer.put( UniversalTag.SEQUENCE.getValue() ); |
| buffer.put( TLV.getBytes( eccSeqLength ) ); |
| |
| buffer.put( UniversalTag.ENUMERATED.getValue() ); |
| buffer.put( ( byte ) 1 ); |
| buffer.put( BerValue.getBytes( getChangeType().getValue() ) ); |
| |
| if ( getPreviousDn() != null ) |
| { |
| BerValue.encode( buffer, previousDnBytes ); |
| } |
| |
| if ( getChangeNumber() != UNDEFINED_CHANGE_NUMBER ) |
| { |
| BerValue.encode( buffer, getChangeNumber() ); |
| } |
| |
| return buffer; |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public byte[] getValue() |
| { |
| if ( value == null ) |
| { |
| try |
| { |
| computeLength(); |
| ByteBuffer buffer = ByteBuffer.allocate( valueLength ); |
| |
| buffer.put( UniversalTag.SEQUENCE.getValue() ); |
| buffer.put( TLV.getBytes( eccSeqLength ) ); |
| |
| buffer.put( UniversalTag.ENUMERATED.getValue() ); |
| buffer.put( ( byte ) 1 ); |
| buffer.put( BerValue.getBytes( getChangeType().getValue() ) ); |
| |
| if ( getPreviousDn() != null ) |
| { |
| BerValue.encode( buffer, previousDnBytes ); |
| } |
| |
| if ( getChangeNumber() != UNDEFINED_CHANGE_NUMBER ) |
| { |
| BerValue.encode( buffer, getChangeNumber() ); |
| } |
| |
| value = buffer.array(); |
| } |
| catch ( Exception e ) |
| { |
| return null; |
| } |
| } |
| |
| return value; |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public ChangeType getChangeType() |
| { |
| return getEntryChange().getChangeType(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void setChangeType( ChangeType changeType ) |
| { |
| getEntryChange().setChangeType( changeType ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public Dn getPreviousDn() |
| { |
| return getEntryChange().getPreviousDn(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void setPreviousDn( Dn previousDn ) |
| { |
| getEntryChange().setPreviousDn( previousDn ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public long getChangeNumber() |
| { |
| return getEntryChange().getChangeNumber(); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void setChangeNumber( long changeNumber ) |
| { |
| getEntryChange().setChangeNumber( changeNumber ); |
| } |
| |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public Asn1Object decode( byte[] controlBytes ) throws DecoderException |
| { |
| ByteBuffer bb = ByteBuffer.wrap( controlBytes ); |
| EntryChangeContainer container = new EntryChangeContainer( getCodecService(), this ); |
| DECODER.decode( bb, container ); |
| return this; |
| } |
| } |