/*
* 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.codec.controls.search.persistentSearch;
import org.apache.directory.shared.asn1.DecoderException;
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.BooleanDecoder;
import org.apache.directory.shared.asn1.ber.tlv.BooleanDecoderException;
import org.apache.directory.shared.asn1.ber.tlv.IntegerDecoder;
import org.apache.directory.shared.asn1.ber.tlv.IntegerDecoderException;
import org.apache.directory.shared.asn1.ber.tlv.UniversalTag;
import org.apache.directory.shared.asn1.ber.tlv.Value;
import org.apache.directory.shared.i18n.I18n;
import org.apache.directory.shared.ldap.model.message.controls.PersistentSearch;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class implements the PSearchControl. All the actions are declared in
* this class. As it is a singleton, these declaration are only done once.
*
* The decoded grammar is the following :
*
* PersistenceSearch ::= SEQUENCE {
* changeTypes INTEGER, -- an OR combinaison of 0, 1, 2 and 4 --
* changeOnly BOOLEAN,
* returnECs BOOLEAN
* }
*
* The changeTypes field is the logical OR of one or more of these values:
* add (1),
* delete (2),
* modify (4),
* modDN (8).
*
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
*/
public final class PersistentSearchGrammar extends AbstractGrammar<PersistentSearchContainer>
{
/** The logger */
static final Logger LOG = LoggerFactory.getLogger( PersistentSearchGrammar.class );
/** Speedup for logs */
static final boolean IS_DEBUG = LOG.isDebugEnabled();
/** The instance of grammar. PSearchControlGrammar is a singleton */
private static Grammar<?> instance = new PersistentSearchGrammar();
/**
* Creates a new PSearchControlGrammar object.
*/
@SuppressWarnings("unchecked")
private PersistentSearchGrammar()
{
setName( PersistentSearchGrammar.class.getName() );
// Create the transitions table
super.transitions = new GrammarTransition[PersistentSearchStates.LAST_PSEARCH_STATE.ordinal()][256];
/**
* Transition from initial state to Psearch sequence
* PSearch ::= SEQUENCE OF {
* ...
*
* Initialize the persistence search object
*/
super.transitions[PersistentSearchStates.START_STATE.ordinal()][UniversalTag.SEQUENCE.getValue()] =
new GrammarTransition<PersistentSearchContainer>( PersistentSearchStates.START_STATE,
PersistentSearchStates.PSEARCH_SEQUENCE_STATE,
UniversalTag.SEQUENCE.getValue(), null );
/**
* Transition from Psearch sequence to Change types
* PSearch ::= SEQUENCE OF {
* changeTypes INTEGER, -- an OR combinaison of 0, 1, 2 and 4 --
* ...
*
* Stores the change types value
*/
super.transitions[PersistentSearchStates.PSEARCH_SEQUENCE_STATE.ordinal()][UniversalTag.INTEGER.getValue()] =
new GrammarTransition<PersistentSearchContainer>( PersistentSearchStates.PSEARCH_SEQUENCE_STATE,
PersistentSearchStates.CHANGE_TYPES_STATE,
UniversalTag.INTEGER.getValue(),
new GrammarAction<PersistentSearchContainer>( "Set PSearchControl changeTypes" )
{
public void action( PersistentSearchContainer container ) throws DecoderException
{
Value value = container.getCurrentTLV().getValue();
try
{
// Check that the value is into the allowed interval
int changeTypes = IntegerDecoder.parse( value,
PersistentSearch.CHANGE_TYPES_MIN,
PersistentSearch.CHANGE_TYPES_MAX );
if ( IS_DEBUG )
{
LOG.debug( "changeTypes = " + changeTypes );
}
container.getPersistentSearchDecorator().setChangeTypes( changeTypes );
}
catch ( IntegerDecoderException e )
{
String msg = I18n.err( I18n.ERR_04051 );
LOG.error( msg, e );
throw new DecoderException( msg );
}
}
} );
/**
* Transition from Change types to Changes only
* PSearch ::= SEQUENCE OF {
* ...
* changeOnly BOOLEAN,
* ...
*
* Stores the change only flag
*/
super.transitions[PersistentSearchStates.CHANGE_TYPES_STATE.ordinal()][UniversalTag.BOOLEAN.getValue()] =
new GrammarTransition<PersistentSearchContainer>( PersistentSearchStates.CHANGE_TYPES_STATE,
PersistentSearchStates.CHANGES_ONLY_STATE, UniversalTag.BOOLEAN.getValue(),
new GrammarAction<PersistentSearchContainer>( "Set PSearchControl changesOnly" )
{
public void action( PersistentSearchContainer container ) throws DecoderException
{
Value value = container.getCurrentTLV().getValue();
try
{
boolean changesOnly = BooleanDecoder.parse( value );
if ( IS_DEBUG )
{
LOG.debug( "changesOnly = " + changesOnly );
}
container.getPersistentSearchDecorator().setChangesOnly( changesOnly );
}
catch ( BooleanDecoderException e )
{
String msg = I18n.err( I18n.ERR_04052 );
LOG.error( msg, e );
throw new DecoderException( msg );
}
}
} );
/**
* Transition from Change types to Changes only
* PSearch ::= SEQUENCE OF {
* ...
* returnECs BOOLEAN
* }
*
* Stores the return ECs flag
*/
super.transitions[PersistentSearchStates.CHANGES_ONLY_STATE.ordinal()][UniversalTag.BOOLEAN.getValue()] =
new GrammarTransition<PersistentSearchContainer>( PersistentSearchStates.CHANGES_ONLY_STATE,
PersistentSearchStates.RETURN_ECS_STATE, UniversalTag.BOOLEAN.getValue(),
new GrammarAction<PersistentSearchContainer>( "Set PSearchControl returnECs" )
{
public void action( PersistentSearchContainer container ) throws DecoderException
{
Value value = container.getCurrentTLV().getValue();
try
{
boolean returnECs = BooleanDecoder.parse( value );
if ( IS_DEBUG )
{
LOG.debug( "returnECs = " + returnECs );
}
container.getPersistentSearchDecorator().setReturnECs( returnECs );
// We can have an END transition
container.setGrammarEndAllowed( true );
}
catch ( BooleanDecoderException e )
{
String msg = I18n.err( I18n.ERR_04053 );
LOG.error( msg, e );
throw new DecoderException( msg );
}
}
} );
}
/**
* This class is a singleton.
*
* @return An instance on this grammar
*/
public static Grammar<?> getInstance()
{
return instance;
}
}