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 class DERNull 026 extends ASN1Null 027 { 028 byte[] zeroBytes = new byte[0]; 029 030 public DERNull() 031 { 032 } 033 034 void encode( 035 DEROutputStream out) 036 throws IOException 037 { 038 out.writeEncoded(NULL, zeroBytes); 039 } 040 041 public boolean equals( 042 Object o) 043 { 044 if ((o == null) || !(o instanceof DERNull)) 045 { 046 return false; 047 } 048 049 return true; 050 } 051 052 public int hashCode() 053 { 054 return 0; 055 } 056 }