1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, 13 * software distributed under the License is distributed on an 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 * KIND, either express or implied. See the License for the 16 * specific language governing permissions and limitations 17 * under the License. 18 * 19 */ 20 package org.apache.directory.server.kerberos.shared.messages.value; 21 22 23 import java.util.BitSet; 24 25 26 /** 27 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a> 28 * @version $Rev: 540371 $, $Date: 2007-05-22 02:00:43 +0200 (Di, 22 Mai 2007) $ 29 */ 30 public abstract class Options 31 { 32 private BitSet options; 33 private int maxSize; 34 35 36 protected Options( int maxSize ) 37 { 38 this.maxSize = maxSize; 39 options = new BitSet( maxSize ); 40 } 41 42 43 /** 44 * Returns whether the option at a given index matches the option in this {@link Options}. 45 * 46 * @param options 47 * @param option 48 * @return true if two options are the same. 49 */ 50 public boolean match( Options options, int option ) 51 { 52 return options.get( option ) == this.get( option ); 53 } 54 55 56 /** 57 * Returns the value of the option at the given index. 58 * 59 * @param index 60 * @return true if the option at the given index is set. 61 */ 62 public boolean get( int index ) 63 { 64 return options.get( index ); 65 } 66 67 68 /** 69 * Sets the option at a given index. 70 * 71 * @param index 72 */ 73 public void set( int index ) 74 { 75 options.set( index ); 76 } 77 78 79 /** 80 * Clears (sets false) the option at a given index. 81 * 82 * @param index 83 */ 84 public void clear( int index ) 85 { 86 options.clear( index ); 87 } 88 89 90 /** 91 * Byte-reversing methods are an anomaly of the BouncyCastle 92 * DERBitString endianness. Thes methods can be removed if the 93 * Apache Directory Snickers codecs operate differently. 94 * 95 * @return The raw {@link Options} bytes. 96 */ 97 public byte[] getBytes() 98 { 99 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 }