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.shared.asn1.util;
021
022
023 import org.apache.directory.shared.asn1.ber.tlv.Value;
024 import org.apache.directory.shared.i18n.I18n;
025 import org.slf4j.Logger;
026 import org.slf4j.LoggerFactory;
027
028
029 /**
030 * Parse and decode a Boolean value.
031 *
032 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
033 * @version $Rev: 912399 $, $Date: 2010-02-21 22:52:31 +0200 (Sun, 21 Feb 2010) $
034 */
035 public class BooleanDecoder
036 {
037 /** The logger */
038 private static final Logger log = LoggerFactory.getLogger( BooleanDecoder.class );
039
040
041 // ~ Methods
042 // ------------------------------------------------------------------------------------
043
044 /**
045 * Parse a byte buffer and send back a booelan.
046 *
047 * @param value
048 * The byte buffer to parse
049 * @return A boolean.
050 * @throws BooleanDecoderException
051 * Thrown if the byte stream does not contains a boolean
052 */
053 public static boolean parse( Value value ) throws BooleanDecoderException
054 {
055 byte[] bytes = value.getData();
056
057 if ( ( bytes == null ) || ( bytes.length == 0 ) )
058 {
059 throw new BooleanDecoderException( I18n.err( I18n.ERR_00034 ) );
060 }
061
062 if ( bytes.length != 1 )
063 {
064 throw new BooleanDecoderException( I18n.err( I18n.ERR_00035 ) );
065 }
066
067 if ( ( bytes[0] != 0 ) && ( bytes[0] != ( byte ) 0xFF ) )
068 {
069 log.warn( "A boolean must be encoded with a 0x00 or a 0xFF value" );
070 }
071
072 return bytes[0] != 0;
073 }
074 }