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 21:52:31 +0100 (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 }