/*
* 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.shared.ldap.extras.extended.ads_impl.cancel;
import org.apache.directory.shared.asn1.ber.Asn1Container;
import org.apache.directory.shared.asn1.ber.grammar.AbstractGrammar;
import org.apache.directory.shared.asn1.ber.grammar.Grammar;
import org.apache.directory.shared.asn1.ber.grammar.GrammarAction;
import org.apache.directory.shared.asn1.ber.grammar.GrammarTransition;
import org.apache.directory.shared.asn1.ber.tlv.UniversalTag;
import org.apache.directory.shared.asn1.ber.tlv.Value;
import org.apache.directory.shared.asn1.DecoderException;
import org.apache.directory.shared.asn1.ber.tlv.IntegerDecoder;
import org.apache.directory.shared.asn1.ber.tlv.IntegerDecoderException;
import org.apache.directory.shared.i18n.I18n;
import org.apache.directory.shared.util.Strings;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class implements the Cancel operation. All the actions are declared
* in this class. As it is a singleton, these declaration are only done once.
* The grammar is :
*
* <pre>
* cancelRequestValue ::= SEQUENCE {
* cancelId MessageID
* -- MessageID is as defined in [RFC2251]
* }
* </pre>
*
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
*/
public final class CancelGrammar extends AbstractGrammar<CancelContainer>
{
/** The logger */
static final Logger LOG = LoggerFactory.getLogger( CancelGrammar.class );
/** Speedup for logs */
static final boolean IS_DEBUG = LOG.isDebugEnabled();
/** The instance of grammar. CancelGrammar is a singleton */
private static Grammar<CancelContainer> instance = new CancelGrammar();
/**
* Creates a new GracefulDisconnectGrammar object.
*/
@SuppressWarnings(
{ "unchecked", "rawtypes" })
private CancelGrammar()
{
setName( CancelGrammar.class.getName() );
// Create the transitions table
super.transitions = new GrammarTransition[CancelStatesEnum.LAST_CANCEL_STATE.ordinal()][256];
/**
* Transition from init state to cancel sequence
* cancelRequestValue ::= SEQUENCE {
* ...
*
* Creates the Cancel object
*/
super.transitions[CancelStatesEnum.START_STATE.ordinal()][UniversalTag.SEQUENCE.getValue()] =
new GrammarTransition<CancelContainer>( CancelStatesEnum.START_STATE,
CancelStatesEnum.CANCEL_SEQUENCE_STATE,
UniversalTag.SEQUENCE.getValue(),
new GrammarAction( "Init Cancel" )
{
public void action( Asn1Container container )
{
CancelContainer cancelContainer = ( CancelContainer ) container;
Cancel cancel = new Cancel();
cancelContainer.setCancel( cancel );
}
} );
/**
* Transition from cancel SEQ to cancelId
*
* cancelRequestValue ::= SEQUENCE {
* cancelId MessageID
* }
*
* Set the cancelId value into the Cancel object.
*/
super.transitions[CancelStatesEnum.CANCEL_SEQUENCE_STATE.ordinal()][UniversalTag.INTEGER.getValue()] =
new GrammarTransition<CancelContainer>( CancelStatesEnum.CANCEL_SEQUENCE_STATE,
CancelStatesEnum.CANCEL_ID_STATE,
UniversalTag.INTEGER.getValue(),
new GrammarAction( "Stores CancelId" )
{
public void action( Asn1Container container ) throws DecoderException
{
CancelContainer cancelContainer = ( CancelContainer ) container;
Value value = cancelContainer.getCurrentTLV().getValue();
try
{
int cancelId = IntegerDecoder.parse( value, 0, Integer.MAX_VALUE );
if ( IS_DEBUG )
{
LOG.debug( "CancelId = " + cancelId );
}
cancelContainer.getCancel().setCancelId( cancelId );
cancelContainer.setGrammarEndAllowed( true );
}
catch ( IntegerDecoderException e )
{
String msg = I18n.err( I18n.ERR_04031, Strings.dumpBytes( value.getData() ) );
LOG.error( msg );
throw new DecoderException( msg );
}
}
} );
}
/**
* This class is a singleton.
*
* @return An instance on this grammar
*/
public static Grammar<CancelContainer> getInstance()
{
return instance;
}
}