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     */
020    package org.apache.directory.server.kerberos.shared.io.decoder;
021    
022    
023    import java.util.Enumeration;
024    
025    import org.apache.directory.server.kerberos.shared.messages.value.KerberosTime;
026    import org.apache.directory.server.kerberos.shared.messages.value.LastRequest;
027    import org.apache.directory.server.kerberos.shared.messages.value.LastRequestEntry;
028    import org.apache.directory.server.kerberos.shared.messages.value.LastRequestType;
029    import org.apache.directory.shared.asn1.der.DEREncodable;
030    import org.apache.directory.shared.asn1.der.DERGeneralizedTime;
031    import org.apache.directory.shared.asn1.der.DERInteger;
032    import org.apache.directory.shared.asn1.der.DERSequence;
033    import org.apache.directory.shared.asn1.der.DERTaggedObject;
034    
035    
036    /**
037     * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
038     * @version $Rev: 589780 $, $Date: 2007-10-29 19:14:59 +0100 (Mon, 29 Oct 2007) $
039     */
040    public class LastRequestDecoder
041    {
042        /**
043         * LastReq ::=   SEQUENCE OF SEQUENCE {
044         * lr-type[0]               INTEGER,
045         * lr-value[1]              KerberosTime
046         * }
047         */
048        protected static LastRequest decodeSequence( DERSequence sequence )
049        {
050            LastRequestEntry[] entries = new LastRequestEntry[sequence.size()];
051    
052            int ii = 0;
053            for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
054            {
055                DERSequence object = ( DERSequence ) e.nextElement();
056                LastRequestEntry entry = decode( object );
057                entries[ii] = entry;
058                ii++;
059            }
060    
061            return new LastRequest( entries );
062        }
063    
064    
065        protected static LastRequestEntry decode( DERSequence sequence )
066        {
067            LastRequestType type = LastRequestType.NONE;
068            KerberosTime value = null;
069    
070            for ( Enumeration<DEREncodable> e = sequence.getObjects(); e.hasMoreElements(); )
071            {
072                DERTaggedObject object = ( DERTaggedObject ) e.nextElement();
073                int tag = object.getTagNo();
074                DEREncodable derObject = object.getObject();
075    
076                switch ( tag )
077                {
078                    case 0:
079                        DERInteger tag0 = ( DERInteger ) derObject;
080                        type = LastRequestType.getTypeByOrdinal( tag0.intValue() );
081                        break;
082                    case 1:
083                        DERGeneralizedTime tag1 = ( DERGeneralizedTime ) derObject;
084                        value = KerberosTimeDecoder.decode( tag1 );
085                        break;
086                }
087            }
088    
089            return new LastRequestEntry( type, value );
090        }
091    }