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package com.lowagie.bc.asn1;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.SimpleTimeZone;
/**
* UTC time object.
*/
public class DERUTCTime
extends DERObject
{
String time;
/**
* return an UTC Time from the passed in object.
*
* @exception IllegalArgumentException if the object cannot be converted.
*/
public static DERUTCTime getInstance(
Object obj)
{
if (obj == null || obj instanceof DERUTCTime)
{
return (DERUTCTime)obj;
}
if (obj instanceof ASN1OctetString)
{
return new DERUTCTime(((ASN1OctetString)obj).getOctets());
}
throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
}
/**
* return an UTC Time from a tagged object.
*
* @param obj the tagged object holding the object we want
* @param explicit true if the object is meant to be explicitly
* tagged false otherwise.
* @exception IllegalArgumentException if the tagged object cannot
* be converted.
*/
public static DERUTCTime getInstance(
ASN1TaggedObject obj,
boolean explicit)
{
return getInstance(obj.getObject());
}
/**
* The correct format for this is YYMMDDHHMMSSZ (it used to be that seconds were
* never encoded. When you're creating one of these objects from scratch, that's
* what you want to use, otherwise we'll try to deal with whatever gets read from
* the input stream... (this is why the input format is different from the getTime()
* method output).
* <p>
*
* @param time the time string.
*/
public DERUTCTime(
String time)
{
this.time = time;
}
/**
* base constructer from a java.util.date object
*/
public DERUTCTime(
Date time)
{
SimpleDateFormat dateF = new SimpleDateFormat("yyMMddHHmmss'Z'");
dateF.setTimeZone(new SimpleTimeZone(0,"Z"));
this.time = dateF.format(time);
}
DERUTCTime(
byte[] bytes)
{
//
// explicitly convert to characters
//
char[] dateC = new char[bytes.length];
for (int i = 0; i != dateC.length; i++)
{
dateC[i] = (char)(bytes[i] & 0xff);
}
this.time = new String(dateC);
}
/**
* return the time - always in the form of
* YYMMDDhhmmssGMT(+hh:mm|-hh:mm).
* <p>
* Normally in a certificate we would expect "Z" rather than "GMT",
* however adding the "GMT" means we can just use:
* <pre>
* dateF = new SimpleDateFormat("yyMMddHHmmssz");
* </pre>
* To read in the time and get a date which is compatible with our local
* time zone.
* <p>
* <b>Note:</b> In some cases, due to the local date processing, this
* may lead to unexpected results. If you want to stick the normal
* convention of 1950 to 2049 use the getAdjustedTime() method.
*/
public String getTime()
{
//
// standardise the format.
//
if (time.length() == 11)
{
return time.substring(0, 10) + "00GMT+00:00";
}
else if (time.length() == 13)
{
return time.substring(0, 12) + "GMT+00:00";
}
else if (time.length() == 17)
{
return time.substring(0, 12) + "GMT" + time.substring(12, 15) + ":" + time.substring(15, 17);
}
return time;
}
/**
* return the time as an adjusted date with a 4 digit year. This goes
* in the range of 1950 - 2049.
*/
public String getAdjustedTime()
{
String d = this.getTime();
if (d.charAt(0) < '5')
{
return "20" + d;
}
else
{
return "19" + d;
}
}
private byte[] getOctets()
{
char[] cs = time.toCharArray();
byte[] bs = new byte[cs.length];
for (int i = 0; i != cs.length; i++)
{
bs[i] = (byte)cs[i];
}
return bs;
}
void encode(
DEROutputStream out)
throws IOException
{
out.writeEncoded(UTC_TIME, this.getOctets());
}
public boolean equals(
Object o)
{
if ((o == null) || !(o instanceof DERUTCTime))
{
return false;
}
return time.equals(((DERUTCTime)o).time);
}
}
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