/*
    *  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.kerberos.codec.krbCred;
  
  
  import org.apache.directory.api.asn1.actions.CheckNotNullLength;
  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.GrammarTransition;
  import org.apache.directory.api.asn1.ber.tlv.UniversalTag;
  import org.apache.directory.shared.kerberos.KerberosConstants;
  import org.apache.directory.shared.kerberos.codec.krbCred.actions.CheckMsgType;
  import org.apache.directory.shared.kerberos.codec.krbCred.actions.KrbCredInit;
  import org.apache.directory.shared.kerberos.codec.krbCred.actions.StoreEncPart;
  import org.apache.directory.shared.kerberos.codec.krbCred.actions.StorePvno;
  import org.apache.directory.shared.kerberos.codec.krbCred.actions.StoreTickets;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * This class implements the KrbCred structure. All the actions are declared
   * in this class. As it is a singleton, these declaration are only done once. If
   * an action is to be added or modified, this is where the work is to be done !
   *
   * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
   */
  public final class KrbCredGrammar extends AbstractGrammar<KrbCredContainer>
  {
      /** The logger */
      static final Logger LOG = LoggerFactory.getLogger( KrbCredGrammar.class );
  
      /** A speedup for logger */
      static final boolean IS_DEBUG = LOG.isDebugEnabled();
  
      /** The instance of grammar. KrbCredCredGrammar is a singleton */
      private static Grammar<KrbCredContainer> instance = new KrbCredGrammar();
  
  
      /**
       * Creates a new KrbCredGrammar object.
       */
      @SuppressWarnings("unchecked")
      private KrbCredGrammar()
      {
          setName( KrbCredGrammar.class.getName() );
  
          // Create the transitions table
          super.transitions = new GrammarTransition[KrbCredStatesEnum.LAST_KRB_CRED_STATE.ordinal()][256];
  
          // ============================================================================================
          // KrbCred
          // ============================================================================================
  
          super.transitions[KrbCredStatesEnum.START_STATE.ordinal()][KerberosConstants.KRB_CRED_TAG] =
              new GrammarTransition<KrbCredContainer>(
                  KrbCredStatesEnum.START_STATE, KrbCredStatesEnum.KRB_CRED_TAG_STATE, KerberosConstants.KRB_CRED_TAG,
                  new KrbCredInit() );
  
          super.transitions[KrbCredStatesEnum.KRB_CRED_TAG_STATE.ordinal()][UniversalTag.SEQUENCE.getValue()] =
              new GrammarTransition<KrbCredContainer>(
                  KrbCredStatesEnum.KRB_CRED_TAG_STATE,
                  KrbCredStatesEnum.KRB_CRED_SEQ_TAG_STATE,
                  UniversalTag.SEQUENCE,
                  new CheckNotNullLength<KrbCredContainer>() );
  
          super.transitions[KrbCredStatesEnum.KRB_CRED_SEQ_TAG_STATE.ordinal()][KerberosConstants.KRB_CRED_PVNO_TAG] =
              new GrammarTransition<KrbCredContainer>(
                  KrbCredStatesEnum.KRB_CRED_SEQ_TAG_STATE,
                  KrbCredStatesEnum.KRB_CRED_PVNO_TAG_STATE,
                  KerberosConstants.KRB_CRED_PVNO_TAG,
                  new CheckNotNullLength<KrbCredContainer>() );
  
          super.transitions[KrbCredStatesEnum.KRB_CRED_PVNO_TAG_STATE.ordinal()][UniversalTag.INTEGER.getValue()] =
              new GrammarTransition<KrbCredContainer>(
                  KrbCredStatesEnum.KRB_CRED_PVNO_TAG_STATE,
                  KrbCredStatesEnum.KRB_CRED_PVNO_STATE,
                  UniversalTag.INTEGER,
                  new StorePvno() );
  
          super.transitions[KrbCredStatesEnum.KRB_CRED_PVNO_STATE.ordinal()][KerberosConstants.KRB_CRED_MSGTYPE_TAG] =
              new GrammarTransition<KrbCredContainer>(
                 KrbCredStatesEnum.KRB_CRED_PVNO_STATE,
                 KrbCredStatesEnum.KRB_CRED_MSGTYPE_TAG_STATE,
                 KerberosConstants.KRB_CRED_MSGTYPE_TAG,
                 new CheckNotNullLength<KrbCredContainer>() );
 
         super.transitions[KrbCredStatesEnum.KRB_CRED_MSGTYPE_TAG_STATE.ordinal()][UniversalTag.INTEGER.getValue()] =
             new GrammarTransition<KrbCredContainer>(
                 KrbCredStatesEnum.KRB_CRED_MSGTYPE_TAG_STATE,
                 KrbCredStatesEnum.KRB_CRED_MSGTYPE_STATE,
                 UniversalTag.INTEGER,
                 new CheckMsgType() );
 
         super.transitions[KrbCredStatesEnum.KRB_CRED_MSGTYPE_STATE.ordinal()][KerberosConstants.KRB_CRED_TICKETS_TAG] =
             new GrammarTransition<KrbCredContainer>(
                 KrbCredStatesEnum.KRB_CRED_MSGTYPE_STATE,
                 KrbCredStatesEnum.KRB_CRED_TICKETS_TAG_STATE,
                 KerberosConstants.KRB_CRED_TICKETS_TAG,
                 new CheckNotNullLength<KrbCredContainer>() );
 
         super.transitions[KrbCredStatesEnum.KRB_CRED_TICKETS_TAG_STATE.ordinal()][UniversalTag.SEQUENCE.getValue()] =
             new GrammarTransition<KrbCredContainer>(
                 KrbCredStatesEnum.KRB_CRED_TICKETS_TAG_STATE,
                 KrbCredStatesEnum.KRB_CRED_TICKETS_STATE,
                 UniversalTag.SEQUENCE,
                 new CheckNotNullLength<KrbCredContainer>() );
 
         super.transitions[KrbCredStatesEnum.KRB_CRED_TICKETS_STATE.ordinal()][KerberosConstants.TICKET_TAG] =
             new GrammarTransition<KrbCredContainer>(
                 KrbCredStatesEnum.KRB_CRED_TICKETS_STATE,
                 KrbCredStatesEnum.KRB_CRED_TICKETS_STATE,
                 KerberosConstants.TICKET_TAG,
                 new StoreTickets() );
 
         super.transitions[KrbCredStatesEnum.KRB_CRED_TICKETS_STATE.ordinal()][KerberosConstants.KRB_CRED_ENCPART_TAG] =
             new GrammarTransition<KrbCredContainer>(
                 KrbCredStatesEnum.KRB_CRED_TICKETS_STATE,
                 KrbCredStatesEnum.KRB_CRED_ENCPART_TAG_STATE,
                 KerberosConstants.KRB_CRED_ENCPART_TAG,
                 new StoreEncPart() );
     }
 
 
     /**
      * Get the instance of this grammar
      *
      * @return An instance on the KrbCredInfo Grammar
      */
     public static Grammar<KrbCredContainer> getInstance()
     {
         return instance;
     }
 }