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      1 /*
      2  *  Licensed to the Apache Software Foundation (ASF) under one or more
      3  *  contributor license agreements.  See the NOTICE file distributed with
      4  *  this work for additional information regarding copyright ownership.
      5  *  The ASF licenses this file to You under the Apache License, Version 2.0
      6  *  (the "License"); you may not use this file except in compliance with
      7  *  the License.  You may obtain a copy of the License at
      8  *
      9  *     http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  *  Unless required by applicable law or agreed to in writing, software
     12  *  distributed under the License is distributed on an "AS IS" BASIS,
     13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  *  See the License for the specific language governing permissions and
     15  *  limitations under the License.
     16  */
     17 
     18 /**
     19 * @author Vladimir N. Molotkov, Stepan M. Mishura
     20 * @version $Revision$
     21 */
     22 
     23 package org.apache.harmony.security.asn1;
     24 
     25 import java.io.IOException;
     26 
     27 
     28 /**
     29  * This class represents ASN.1 Boolean type.
     30  *
     31  * @see <a href="http://asn1.elibel.tm.fr/en/standards/index.htm">ASN.1</a>
     32  */
     33 public final class ASN1Boolean extends ASN1Primitive {
     34 
     35     /** default implementation */
     36     private static final ASN1Boolean ASN1 = new ASN1Boolean();
     37 
     38     /**
     39      * Constructs ASN.1 Boolean type
     40      *
     41      * The constructor is provided for inheritance purposes
     42      * when there is a need to create a custom ASN.1 Boolean type.
     43      * To get a default implementation it is recommended to use
     44      * getInstance() method.
     45      */
     46     public ASN1Boolean() {
     47         super(TAG_BOOLEAN);
     48     }
     49 
     50     /**
     51      * Returns ASN.1 Boolean type default implementation
     52      *
     53      * The default implementation works with encoding
     54      * that is represented as Boolean object.
     55      *
     56      * @return ASN.1 Boolean type default implementation
     57      */
     58     public static ASN1Boolean getInstance() {
     59         return ASN1;
     60     }
     61 
     62     public Object decode(BerInputStream in) throws IOException {
     63         in.readBoolean();
     64 
     65         if (in.isVerify) {
     66             return null;
     67         }
     68         return getDecodedObject(in);
     69     }
     70 
     71     /**
     72      * Extracts Boolean object from BER input stream.
     73      *
     74      * @param in - BER input stream
     75      * @return java.lang.Boolean object
     76      */
     77     @Override public Object getDecodedObject(BerInputStream in) throws IOException {
     78         if (in.buffer[in.contentOffset] == 0) {
     79             return Boolean.FALSE;
     80         }
     81         return Boolean.TRUE;
     82     }
     83 
     84     public void encodeContent(BerOutputStream out) {
     85         out.encodeBoolean();
     86     }
     87 
     88     public void setEncodingContent(BerOutputStream out) {
     89         out.length = 1;
     90     }
     91 }
     92