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
23package org.apache.harmony.security.asn1;
24
25import 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
34public class ASN1Boolean extends ASN1Primitive {
35
36    // default implementation
37    private static final ASN1Boolean ASN1 = new ASN1Boolean();
38
39    /**
40     * Constructs ASN.1 Boolean type
41     *
42     * The constructor is provided for inheritance purposes
43     * when there is a need to create a custom ASN.1 Boolean type.
44     * To get a default implementation it is recommended to use
45     * getInstance() method.
46     */
47    public ASN1Boolean() {
48        super(TAG_BOOLEAN);
49    }
50
51    /**
52     * Returns ASN.1 Boolean type default implementation
53     *
54     * The default implementation works with encoding
55     * that is represented as Boolean object.
56     *
57     * @return ASN.1 Boolean type default implementation
58     */
59    public static ASN1Boolean getInstance() {
60        return ASN1;
61    }
62
63    //
64    //
65    // Decode
66    //
67    //
68
69    public Object decode(BerInputStream in) throws IOException {
70        in.readBoolean();
71
72        if (in.isVerify) {
73            return null;
74        }
75        return getDecodedObject(in);
76    }
77
78    /**
79     * Extracts Boolean object from BER input stream.
80     *
81     * @param in - BER input stream
82     * @return java.lang.Boolean object
83     */
84    public Object getDecodedObject(BerInputStream in) throws IOException {
85        if (in.buffer[in.contentOffset] == 0) {
86            return Boolean.FALSE;
87        }
88        return Boolean.TRUE;
89    }
90
91    //
92    //
93    // Encode
94    //
95    //
96
97    public void encodeContent(BerOutputStream out) {
98        out.encodeBoolean();
99    }
100
101    public void setEncodingContent(BerOutputStream out) {
102        out.length = 1;
103    }
104}
105