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.messages.value;
021
022
023 import java.util.BitSet;
024
025
026 /**
027 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
028 * @version $Rev: 540371 $, $Date: 2007-05-22 03:00:43 +0300 (Tue, 22 May 2007) $
029 */
030 public abstract class Options
031 {
032 private BitSet options;
033 private int maxSize;
034
035
036 protected Options( int maxSize )
037 {
038 this.maxSize = maxSize;
039 options = new BitSet( maxSize );
040 }
041
042
043 /**
044 * Returns whether the option at a given index matches the option in this {@link Options}.
045 *
046 * @param options
047 * @param option
048 * @return true if two options are the same.
049 */
050 public boolean match( Options options, int option )
051 {
052 return options.get( option ) == this.get( option );
053 }
054
055
056 /**
057 * Returns the value of the option at the given index.
058 *
059 * @param index
060 * @return true if the option at the given index is set.
061 */
062 public boolean get( int index )
063 {
064 return options.get( index );
065 }
066
067
068 /**
069 * Sets the option at a given index.
070 *
071 * @param index
072 */
073 public void set( int index )
074 {
075 options.set( index );
076 }
077
078
079 /**
080 * Clears (sets false) the option at a given index.
081 *
082 * @param index
083 */
084 public void clear( int index )
085 {
086 options.clear( index );
087 }
088
089
090 /**
091 * Byte-reversing methods are an anomaly of the BouncyCastle
092 * DERBitString endianness. Thes methods can be removed if the
093 * Apache Directory Snickers codecs operate differently.
094 *
095 * @return The raw {@link Options} bytes.
096 */
097 public byte[] getBytes()
098 {
099 byte[] bytes = new byte[maxSize / 8];
100
101 for ( int ii = 0; ii < maxSize; ii++ )
102 {
103 if ( options.get( reversePosition( ii ) ) )
104 {
105 bytes[bytes.length - ii / 8 - 1] |= 1 << ( ii % 8 );
106 }
107 }
108 return bytes;
109 }
110
111
112 protected void setBytes( byte[] bytes )
113 {
114 for ( int ii = 0; ii < bytes.length * 8; ii++ )
115 {
116 if ( ( bytes[bytes.length - ii / 8 - 1] & ( 1 << ( ii % 8 ) ) ) > 0 )
117 {
118 options.set( reversePosition( ii ) );
119 }
120 }
121 }
122
123
124 private int reversePosition( int position )
125 {
126 return maxSize - 1 - position;
127 }
128 }