001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *
010 *    http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License.
018 *
019 */
020package org.apache.directory.shared.kerberos.codec.adAndOr;
021
022
023import org.apache.directory.api.asn1.actions.CheckNotNullLength;
024import org.apache.directory.api.asn1.ber.grammar.AbstractGrammar;
025import org.apache.directory.api.asn1.ber.grammar.Grammar;
026import org.apache.directory.api.asn1.ber.grammar.GrammarTransition;
027import org.apache.directory.api.asn1.ber.tlv.UniversalTag;
028import org.apache.directory.shared.kerberos.KerberosConstants;
029import org.apache.directory.shared.kerberos.codec.adAndOr.actions.AdAndOrInit;
030import org.apache.directory.shared.kerberos.codec.adAndOr.actions.StoreConditionCount;
031import org.apache.directory.shared.kerberos.codec.adAndOr.actions.StoreElements;
032import org.slf4j.Logger;
033import org.slf4j.LoggerFactory;
034
035
036/**
037 * This class implements the AdAndOr structure. All the actions are declared
038 * in this class. As it is a singleton, these declaration are only done once. If
039 * an action is to be added or modified, this is where the work is to be done !
040 *
041 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
042 */
043public final class AdAndOrGrammar extends AbstractGrammar<AdAndOrContainer>
044{
045    /** The logger */
046    static final Logger LOG = LoggerFactory.getLogger( AdAndOrGrammar.class );
047
048    /** A speedup for logger */
049    static final boolean IS_DEBUG = LOG.isDebugEnabled();
050
051    /** The instance of grammar. AdAndOrGrammar is a singleton */
052    private static Grammar<AdAndOrContainer> instance = new AdAndOrGrammar();
053
054
055    /**
056     * Creates a new AdAndOrGrammar object.
057     */
058    @SuppressWarnings("unchecked")
059    private AdAndOrGrammar()
060    {
061        setName( AdAndOrGrammar.class.getName() );
062
063        // Create the transitions table
064        super.transitions = new GrammarTransition[AdAndOrStatesEnum.LAST_AD_AND_OR_STATE.ordinal()][256];
065
066        // ============================================================================================
067        // AdAndOr
068        // ============================================================================================
069        // --------------------------------------------------------------------------------------------
070        // Transition from AdAndOr init to AdAndOr SEQ
071        // --------------------------------------------------------------------------------------------
072        // AD-AND-OR               ::= SEQUENCE {
073        super.transitions[AdAndOrStatesEnum.START_STATE.ordinal()][UniversalTag.SEQUENCE.getValue()] =
074            new GrammarTransition<AdAndOrContainer>(
075                AdAndOrStatesEnum.START_STATE,
076                AdAndOrStatesEnum.AD_AND_OR_STATE,
077                UniversalTag.SEQUENCE,
078                new AdAndOrInit() );
079
080        // --------------------------------------------------------------------------------------------
081        // Transition from AdAndOr SEQ to condition-count tag
082        // --------------------------------------------------------------------------------------------
083        // AD-AND-OR               ::= SEQUENCE {
084        //         condition-count [0]
085        super.transitions[AdAndOrStatesEnum.AD_AND_OR_STATE.ordinal()][KerberosConstants.AD_AND_OR_CONDITION_COUNT_TAG] =
086            new GrammarTransition<AdAndOrContainer>(
087                AdAndOrStatesEnum.AD_AND_OR_STATE,
088                AdAndOrStatesEnum.AD_AND_OR_CONDITION_COUNT_TAG_STATE,
089                KerberosConstants.AD_AND_OR_CONDITION_COUNT_TAG,
090                new CheckNotNullLength<AdAndOrContainer>() );
091
092        // --------------------------------------------------------------------------------------------
093        // Transition from condition-count tag to condition-count value
094        // --------------------------------------------------------------------------------------------
095        // AD-AND-OR               ::= SEQUENCE {
096        //         condition-count [0] Int32,
097        super.transitions[AdAndOrStatesEnum.AD_AND_OR_CONDITION_COUNT_TAG_STATE.ordinal()][UniversalTag.INTEGER
098            .getValue()] =
099            new GrammarTransition<AdAndOrContainer>(
100                AdAndOrStatesEnum.AD_AND_OR_CONDITION_COUNT_TAG_STATE,
101                AdAndOrStatesEnum.AD_AND_OR_CONDITION_COUNT_STATE,
102                UniversalTag.INTEGER,
103                new StoreConditionCount() );
104
105        // --------------------------------------------------------------------------------------------
106        // Transition from condition-countvalue to elements
107        // --------------------------------------------------------------------------------------------
108        // AD-AND-OR               ::= SEQUENCE {
109        //         ...
110        //         elements        [1] AuthorizationData
111        // }
112        super.transitions[AdAndOrStatesEnum.AD_AND_OR_CONDITION_COUNT_STATE.ordinal()][KerberosConstants.AD_AND_OR_ELEMENTS_TAG] =
113            new GrammarTransition<AdAndOrContainer>(
114                AdAndOrStatesEnum.AD_AND_OR_CONDITION_COUNT_STATE,
115                AdAndOrStatesEnum.AD_AND_OR_ELEMENTS_TAG_STATE,
116                KerberosConstants.AD_AND_OR_ELEMENTS_TAG,
117                new StoreElements() );
118    }
119
120
121    /**
122     * Get the instance of this grammar
123     *
124     * @return An instance on the AD-AND-OR Grammar
125     */
126    public static Grammar<AdAndOrContainer> getInstance()
127    {
128        return instance;
129    }
130}