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 abstract class ASN1Null
027        extends DERObject
028    {
029        public ASN1Null()
030        {
031        }
032    
033        public int hashCode()
034        {
035            return 0;
036        }
037    
038        public boolean equals(
039            Object o)
040        {
041            if ((o == null) || !(o instanceof ASN1Null))
042            {
043                return false;
044            }
045    
046            return true;
047        }
048    
049        abstract void encode(DEROutputStream out)
050            throws IOException;
051    }