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Timestamp.java
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/*
* Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
package java.security;
import java.io.*;
import java.security.cert.Certificate;
import java.security.cert.CertPath;
import java.security.cert.X509Extension;
import java.util.Date;
import java.util.List;
/**
* This class encapsulates information about a signed timestamp.
* It is immutable.
* It includes the timestamp's date and time as well as information about the
* Timestamping Authority (TSA) which generated and signed the timestamp.
*
* @since 1.5
* @author Vincent Ryan
*/
public final class Timestamp implements Serializable {
private static final long serialVersionUID = -5502683707821851294L;
/**
* The timestamp's date and time
*
* @serial
*/
private Date timestamp;
/**
* The TSA's certificate path.
*
* @serial
*/
private CertPath signerCertPath;
/*
* Hash code for this timestamp.
*/
private transient int myhash = -1;
/**
* Constructs a Timestamp.
*
* @param timestamp is the timestamp's date and time. It must not be null.
* @param signerCertPath is the TSA's certificate path. It must not be null.
* @throws NullPointerException if timestamp or signerCertPath is null.
*/
public Timestamp(Date timestamp, CertPath signerCertPath) {
if (timestamp == null || signerCertPath == null) {
throw new NullPointerException();
}
this.timestamp = new Date(timestamp.getTime()); // clone
this.signerCertPath = signerCertPath;
}
/**
* Returns the date and time when the timestamp was generated.
*
* @return The timestamp's date and time.
*/
public Date getTimestamp() {
return new Date(timestamp.getTime()); // clone
}
/**
* Returns the certificate path for the Timestamping Authority.
*
* @return The TSA's certificate path.
*/
public CertPath getSignerCertPath() {
return signerCertPath;
}
/**
* Returns the hash code value for this timestamp.
* The hash code is generated using the date and time of the timestamp
* and the TSA's certificate path.
*
* @return a hash code value for this timestamp.
*/
public int hashCode() {
if (myhash == -1) {
myhash = timestamp.hashCode() + signerCertPath.hashCode();
}
return myhash;
}
/**
* Tests for equality between the specified object and this
* timestamp. Two timestamps are considered equal if the date and time of
* their timestamp's and their signer's certificate paths are equal.
*
* @param obj the object to test for equality with this timestamp.
*
* @return true if the timestamp are considered equal, false otherwise.
*/
public boolean equals(Object obj) {
if (obj == null || (!(obj instanceof Timestamp))) {
return false;
}
Timestamp that = (Timestamp)obj;
if (this == that) {
return true;
}
return (timestamp.equals(that.getTimestamp()) &&
signerCertPath.equals(that.getSignerCertPath()));
}
/**
* Returns a string describing this timestamp.
*
* @return A string comprising the date and time of the timestamp and
* its signer's certificate.
*/
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append("(");
sb.append("timestamp: " + timestamp);
List<? extends Certificate> certs = signerCertPath.getCertificates();
if (!certs.isEmpty()) {
sb.append("TSA: " + certs.get(0));
} else {
sb.append("TSA: <empty>");
}
sb.append(")");
return sb.toString();
}
// Explicitly reset hash code value to -1
private void readObject(ObjectInputStream ois)
throws IOException, ClassNotFoundException {
ois.defaultReadObject();
myhash = -1;
timestamp = new Date(timestamp.getTime());
}
}