001    /**
002     *  Licensed to the Apache Software Foundation (ASF) under one or more
003     *  contributor license agreements.  See the NOTICE file distributed with
004     *  this work for additional information regarding copyright ownership.
005     *  The ASF licenses this file to You under the Apache License, Version 2.0
006     *  (the "License"); you may not use this file except in compliance with
007     *  the License.  You may obtain a copy of the License at
008     *
009     *     http://www.apache.org/licenses/LICENSE-2.0
010     *
011     *  Unless required by applicable law or agreed to in writing, software
012     *  distributed under the License is distributed on an "AS IS" BASIS,
013     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     *  See the License for the specific language governing permissions and
015     *  limitations under the License.
016     */
017    
018    package org.apache.geronimo.util.asn1;
019    
020    import java.io.IOException;
021    
022    public class DERBoolean
023        extends DERObject
024    {
025        byte         value;
026    
027        public static final DERBoolean FALSE = new DERBoolean(false);
028        public static final DERBoolean TRUE  = new DERBoolean(true);
029    
030        /**
031         * return a boolean from the passed in object.
032         *
033         * @exception IllegalArgumentException if the object cannot be converted.
034         */
035        public static DERBoolean getInstance(
036            Object  obj)
037        {
038            if (obj == null || obj instanceof DERBoolean)
039            {
040                return (DERBoolean)obj;
041            }
042    
043            if (obj instanceof ASN1OctetString)
044            {
045                return new DERBoolean(((ASN1OctetString)obj).getOctets());
046            }
047    
048            if (obj instanceof ASN1TaggedObject)
049            {
050                return getInstance(((ASN1TaggedObject)obj).getObject());
051            }
052    
053            throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
054        }
055    
056        /**
057         * return a DERBoolean from the passed in boolean.
058         */
059        public static DERBoolean getInstance(
060            boolean  value)
061        {
062            return (value ? TRUE : FALSE);
063        }
064    
065        /**
066         * return a Boolean from a tagged object.
067         *
068         * @param obj the tagged object holding the object we want
069         * @param explicit true if the object is meant to be explicitly
070         *              tagged false otherwise.
071         * @exception IllegalArgumentException if the tagged object cannot
072         *               be converted.
073         */
074        public static DERBoolean getInstance(
075            ASN1TaggedObject obj,
076            boolean          explicit)
077        {
078            return getInstance(obj.getObject());
079        }
080    
081        public DERBoolean(
082            byte[]       value)
083        {
084            this.value = value[0];
085        }
086    
087        public DERBoolean(
088            boolean     value)
089        {
090            this.value = (value) ? (byte)0xff : (byte)0;
091        }
092    
093        public boolean isTrue()
094        {
095            return (value != 0);
096        }
097    
098        void encode(
099            DEROutputStream out)
100            throws IOException
101        {
102            byte[]  bytes = new byte[1];
103    
104            bytes[0] = value;
105    
106            out.writeEncoded(BOOLEAN, bytes);
107        }
108    
109        public boolean equals(
110            Object  o)
111        {
112            if ((o == null) || !(o instanceof DERBoolean))
113            {
114                return false;
115            }
116    
117            return (value == ((DERBoolean)o).value);
118        }
119    
120        public int hashCode()
121        {
122            return value;
123        }
124    
125    }