| /* |
| * 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 |
| * |
| * https://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.pagedSearch; |
| |
| |
| import org.apache.directory.api.asn1.DecoderException; |
| import org.apache.directory.api.asn1.ber.grammar.AbstractGrammar; |
| import org.apache.directory.api.asn1.ber.grammar.Grammar; |
| import org.apache.directory.api.asn1.ber.grammar.GrammarAction; |
| import org.apache.directory.api.asn1.ber.grammar.GrammarTransition; |
| import org.apache.directory.api.asn1.ber.tlv.BerValue; |
| import org.apache.directory.api.asn1.ber.tlv.IntegerDecoder; |
| import org.apache.directory.api.asn1.ber.tlv.IntegerDecoderException; |
| import org.apache.directory.api.asn1.ber.tlv.UniversalTag; |
| import org.apache.directory.api.i18n.I18n; |
| import org.apache.directory.api.util.Strings; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| |
| /** |
| * This class implements the PagedSearchControl. 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 : |
| * |
| * realSearchControlValue ::= SEQUENCE { |
| * size INTEGER, |
| * cookie OCTET STRING, |
| * } |
| * |
| * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> |
| */ |
| public final class PagedResultsGrammar extends AbstractGrammar<PagedResultsContainer> |
| { |
| /** The logger */ |
| static final Logger LOG = LoggerFactory.getLogger( PagedResultsGrammar.class ); |
| |
| /** The instance of grammar. PagedSearchControlGrammar is a singleton */ |
| private static Grammar<?> instance = new PagedResultsGrammar(); |
| |
| |
| /** |
| * Creates a new PagedSearchControlGrammar object. |
| */ |
| @SuppressWarnings("unchecked") |
| private PagedResultsGrammar() |
| { |
| setName( PagedResultsGrammar.class.getName() ); |
| |
| // Create the transitions table |
| super.transitions = new GrammarTransition[PagedResultsStates.LAST_PAGED_SEARCH_STATE.ordinal()][256]; |
| |
| /** |
| * Transition from initial state to PagedSearch sequence |
| * realSearchControlValue ::= SEQUENCE OF { |
| * ... |
| * |
| * Nothing to do |
| */ |
| super.transitions[PagedResultsStates.START_STATE.ordinal()][UniversalTag.SEQUENCE.getValue()] = |
| new GrammarTransition<PagedResultsContainer>( PagedResultsStates.START_STATE, |
| PagedResultsStates.PAGED_SEARCH_SEQUENCE_STATE, |
| UniversalTag.SEQUENCE.getValue(), null ); |
| |
| /** |
| * Transition from PagedSearch sequence to size |
| * |
| * realSearchControlValue ::= SEQUENCE OF { |
| * size INTEGER, -- INTEGER (0..maxInt), |
| * ... |
| * |
| * Stores the size value |
| */ |
| super.transitions[PagedResultsStates.PAGED_SEARCH_SEQUENCE_STATE.ordinal()][UniversalTag.INTEGER.getValue()] = |
| new GrammarTransition<PagedResultsContainer>( PagedResultsStates.PAGED_SEARCH_SEQUENCE_STATE, |
| PagedResultsStates.SIZE_STATE, |
| UniversalTag.INTEGER.getValue(), |
| new GrammarAction<PagedResultsContainer>( "Set PagedSearchControl size" ) |
| { |
| public void action( PagedResultsContainer container ) throws DecoderException |
| { |
| BerValue value = container.getCurrentTLV().getValue(); |
| |
| try |
| { |
| // Check that the value is into the allowed interval |
| int size = IntegerDecoder.parse( value, Integer.MIN_VALUE, Integer.MAX_VALUE ); |
| |
| // We allow negative value to absorb a bug in some M$ client. |
| // Those negative values will be transformed to Integer.MAX_VALUE. |
| if ( size < 0 ) |
| { |
| size = Integer.MAX_VALUE; |
| } |
| |
| if ( LOG.isDebugEnabled() ) |
| { |
| LOG.debug( I18n.msg( I18n.MSG_05303_SIZE, size ) ); |
| } |
| |
| container.getPagedResults().setSize( size ); |
| } |
| catch ( IntegerDecoderException ide ) |
| { |
| String msg = I18n.err( I18n.ERR_05306_PAGED_SEARCH_SIZE_DECODING_ERROR ); |
| LOG.error( msg, ide ); |
| throw new DecoderException( msg, ide ); |
| } |
| } |
| } ); |
| |
| /** |
| * Transition from size to cookie |
| * realSearchControlValue ::= SEQUENCE OF { |
| * ... |
| * cookie OCTET STRING |
| * } |
| * |
| * Stores the cookie flag |
| */ |
| super.transitions[PagedResultsStates.SIZE_STATE.ordinal()][UniversalTag.OCTET_STRING.getValue()] = |
| new GrammarTransition<PagedResultsContainer>( PagedResultsStates.SIZE_STATE, |
| PagedResultsStates.COOKIE_STATE, UniversalTag.OCTET_STRING.getValue(), |
| new GrammarAction<PagedResultsContainer>( "Set PagedSearchControl cookie" ) |
| { |
| public void action( PagedResultsContainer container ) |
| { |
| BerValue value = container.getCurrentTLV().getValue(); |
| |
| if ( container.getCurrentTLV().getLength() == 0 ) |
| { |
| container.getPagedResults().setCookie( Strings.EMPTY_BYTES ); |
| } |
| else |
| { |
| container.getPagedResults().setCookie( value.getData() ); |
| } |
| |
| // We can have an END transition |
| container.setGrammarEndAllowed( true ); |
| } |
| } ); |
| } |
| |
| |
| /** |
| * This class is a singleton. |
| * |
| * @return An instance on this grammar |
| */ |
| public static Grammar<?> getInstance() |
| { |
| return instance; |
| } |
| } |