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    /**
023     * A NULL object.
024     */
025    public abstract class ASN1Null
026        extends DERObject
027    {
028        public ASN1Null()
029        {
030        }
031    
032        public int hashCode()
033        {
034            return 0;
035        }
036    
037        public boolean equals(
038            Object o)
039        {
040            if ((o == null) || !(o instanceof ASN1Null))
041            {
042                return false;
043            }
044    
045            return true;
046        }
047    
048        abstract void encode(DEROutputStream out)
049            throws IOException;
050    }