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
18package org.apache.harmony.security.x509;
19
20import java.io.IOException;
21
22/**
23 * This class implements the values of Subject Alternative Name
24 * (OID is 2.5.29.17) and Issuer Alternative Name extensions
25 * (OID is 2.5.29.18).<br>
26 * For more information about these extensions see RFC 3280
27 * at http://www.ietf.org/rfc/rfc3280.txt
28 */
29public final class AlternativeName extends ExtensionValue {
30
31    // constants indicating which alternative name is presented
32    // by this object
33    public static final boolean ISSUER = false;
34    public static final boolean SUBJECT = true;
35
36    /** indicating which alternative name is presented by this object */
37    private boolean which;
38    /** the alternative names */
39    private GeneralNames alternativeNames;
40
41    /**
42     * Creates the extension object on the base of its encoded form.
43     * @param which specifies which alternative names are given
44     * (Subject's or Issuer's)
45     */
46    public AlternativeName(boolean which, byte[] encoding) throws IOException {
47        super(encoding);
48        this.which = which;
49        this.alternativeNames = (GeneralNames) GeneralNames.ASN1.decode(encoding);
50    }
51
52    /**
53     * Returns ASN.1 encoded form of this X.509 AlternativeName value.
54     */
55    @Override public byte[] getEncoded() {
56        if (encoding == null) {
57            encoding = GeneralNames.ASN1.encode(alternativeNames);
58        }
59        return encoding;
60    }
61
62    @Override public void dumpValue(StringBuilder sb, String prefix) {
63        sb.append(prefix).append((which) ? "Subject" : "Issuer").append(" Alternative Names [\n");
64        alternativeNames.dumpValue(sb, prefix + "  ");
65        sb.append(prefix).append("]\n");
66    }
67}
68