001    /**
002     *
003     *  Licensed to the Apache Software Foundation (ASF) under one or more
004     *  contributor license agreements.  See the NOTICE file distributed with
005     *  this work for additional information regarding copyright ownership.
006     *  The ASF licenses this file to You under the Apache License, Version 2.0
007     *  (the "License"); you may not use this file except in compliance with
008     *  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, software
013     *  distributed under the License is distributed on an "AS IS" BASIS,
014     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     *  See the License for the specific language governing permissions and
016     *  limitations under the License.
017     */
018    
019    package org.apache.geronimo.util.asn1;
020    
021    import java.io.IOException;
022    
023    /**
024     * A NULL object.
025     */
026    public class DERNull
027        extends ASN1Null
028    {
029        byte[]  zeroBytes = new byte[0];
030    
031        public DERNull()
032        {
033        }
034    
035        void encode(
036            DEROutputStream  out)
037            throws IOException
038        {
039            out.writeEncoded(NULL, zeroBytes);
040        }
041    
042        public boolean equals(
043            Object o)
044        {
045            if ((o == null) || !(o instanceof DERNull))
046            {
047                return false;
048            }
049    
050            return true;
051        }
052    
053        public int hashCode()
054        {
055            return 0;
056        }
057    }