001 /*
002 * Copyright 2003 Sun Microsystems, Inc. All Rights Reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation. Sun designates this
008 * particular file as subject to the "Classpath" exception as provided
009 * by Sun in the LICENSE file that accompanied this code.
010 *
011 * This code is distributed in the hope that it will be useful, but WITHOUT
012 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
014 * version 2 for more details (a copy is included in the LICENSE file that
015 * accompanied this code).
016 *
017 * You should have received a copy of the GNU General Public License version
018 * 2 along with this work; if not, write to the Free Software Foundation,
019 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020 *
021 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022 * CA 95054 USA or visit www.sun.com if you need additional information or
023 * have any questions.
024 */
025
026 package java.security;
027
028 import java.io.Serializable;
029 import java.security.cert.CertPath;
030 import java.security.cert.X509Extension;
031 import java.util.Date;
032
033 /**
034 * This class encapsulates information about a signed timestamp.
035 * It is immutable.
036 * It includes the timestamp's date and time as well as information about the
037 * Timestamping Authority (TSA) which generated and signed the timestamp.
038 *
039 * @since 1.5
040 * @version 1.9, 05/05/07
041 * @author Vincent Ryan
042 */
043
044 public final class Timestamp implements Serializable {
045
046 private static final long serialVersionUID = -5502683707821851294L;
047
048 /**
049 * The timestamp's date and time
050 *
051 * @serial
052 */
053 private Date timestamp;
054
055 /**
056 * The TSA's certificate path.
057 *
058 * @serial
059 */
060 private CertPath signerCertPath;
061
062 /*
063 * Hash code for this timestamp.
064 */
065 private transient int myhash = -1;
066
067 /**
068 * Constructs a Timestamp.
069 *
070 * @param timestamp is the timestamp's date and time. It must not be null.
071 * @param signerCertPath is the TSA's certificate path. It must not be null.
072 * @throws NullPointerException if timestamp or signerCertPath is null.
073 */
074 public Timestamp(Date timestamp, CertPath signerCertPath) {
075 if (timestamp == null || signerCertPath == null) {
076 throw new NullPointerException();
077 }
078 this .timestamp = new Date(timestamp.getTime()); // clone
079 this .signerCertPath = signerCertPath;
080 }
081
082 /**
083 * Returns the date and time when the timestamp was generated.
084 *
085 * @return The timestamp's date and time.
086 */
087 public Date getTimestamp() {
088 return new Date(timestamp.getTime()); // clone
089 }
090
091 /**
092 * Returns the certificate path for the Timestamping Authority.
093 *
094 * @return The TSA's certificate path.
095 */
096 public CertPath getSignerCertPath() {
097 return signerCertPath;
098 }
099
100 /**
101 * Returns the hash code value for this timestamp.
102 * The hash code is generated using the date and time of the timestamp
103 * and the TSA's certificate path.
104 *
105 * @return a hash code value for this timestamp.
106 */
107 public int hashCode() {
108 if (myhash == -1) {
109 myhash = timestamp.hashCode() + signerCertPath.hashCode();
110 }
111 return myhash;
112 }
113
114 /**
115 * Tests for equality between the specified object and this
116 * timestamp. Two timestamps are considered equal if the date and time of
117 * their timestamp's and their signer's certificate paths are equal.
118 *
119 * @param obj the object to test for equality with this timestamp.
120 *
121 * @return true if the timestamp are considered equal, false otherwise.
122 */
123 public boolean equals(Object obj) {
124 if (obj == null || (!(obj instanceof Timestamp))) {
125 return false;
126 }
127 Timestamp that = (Timestamp) obj;
128
129 if (this == that) {
130 return true;
131 }
132 return (timestamp.equals(that.getTimestamp()) && signerCertPath
133 .equals(that.getSignerCertPath()));
134 }
135
136 /**
137 * Returns a string describing this timestamp.
138 *
139 * @return A string comprising the date and time of the timestamp and
140 * its signer's certificate.
141 */
142 public String toString() {
143 StringBuffer sb = new StringBuffer();
144 sb.append("(");
145 sb.append("timestamp: " + timestamp);
146 sb.append("TSA: " + signerCertPath.getCertificates().get(0));
147 sb.append(")");
148 return sb.toString();
149 }
150 }
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