PdfDate is the PDF date object.
*
* PDF defines a standard date format. The PDF date format closely follows the format
* defined by the international standard ASN.1 (Abstract Syntax Notation One, defined
* in CCITT X.208 or ISO/IEC 8824). A date is a PdfString of the form:
*
* (D: YYYYMMDDHHmmSSOHH'mm') *
* This object is described in the 'Portable Document Format Reference Manual version 1.3'
* section 7.2 (page 183-184)
*
* @see PdfString
* @see java.util.GregorianCalendar
*/
public class PdfDate extends PdfString {
private static final int dateSpace[] = {Calendar.YEAR, 4, 0, Calendar.MONTH, 2, -1, Calendar.DAY_OF_MONTH, 2, 0,
Calendar.HOUR_OF_DAY, 2, 0, Calendar.MINUTE, 2, 0, Calendar.SECOND, 2, 0};
// constructors
/**
* Constructs a PdfDate-object.
*
* @param d the date that has to be turned into a PdfDate-object
*/
public PdfDate(Calendar d) {
super();
StringBuffer date = new StringBuffer("D:");
date.append(setLength(d.get(Calendar.YEAR), 4));
date.append(setLength(d.get(Calendar.MONTH) + 1, 2));
date.append(setLength(d.get(Calendar.DATE), 2));
date.append(setLength(d.get(Calendar.HOUR_OF_DAY), 2));
date.append(setLength(d.get(Calendar.MINUTE), 2));
date.append(setLength(d.get(Calendar.SECOND), 2));
int timezone = (d.get(Calendar.ZONE_OFFSET) + d.get(Calendar.DST_OFFSET)) / (60 * 60 * 1000);
if (timezone == 0) {
date.append("Z");
}
else if (timezone < 0) {
date.append("-");
timezone = -timezone;
}
else {
date.append("+");
}
if (timezone != 0) {
date.append(setLength(timezone, 2)).append("'");
int zone = Math.abs((d.get(Calendar.ZONE_OFFSET) + d.get(Calendar.DST_OFFSET)) / (60 * 1000)) - (timezone * 60);
date.append(setLength(zone, 2)).append("'");
}
value = date.toString();
}
/**
* Constructs a PdfDate-object, representing the current day and time.
*/
public PdfDate() {
this(new GregorianCalendar());
}
/**
* Adds a number of leading zeros to a given String in order to get a String
* of a certain length.
*
* @param i a given number
* @param length the length of the resulting String
* @return the resulting String
*/
private String setLength(int i, int length) { // 1.3-1.4 problem fixed by Finn Bock
StringBuffer tmp = new StringBuffer();
tmp.append(i);
while (tmp.length() < length) {
tmp.insert(0, "0");
}
tmp.setLength(length);
return tmp.toString();
}
/**
* Gives the W3C format of the PdfDate.
* @return a formatted date
*/
public String getW3CDate() {
return getW3CDate(value);
}
/**
* Gives the W3C format of the PdfDate.
* @param d
* @return a formatted date
*/
public static String getW3CDate(String d) {
SimpleDateFormat w3c = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
Calendar c = decode(d);
return w3c.format(c.getTime());
}
/**
* Converts a PDF string representing a date into a Calendar.
* @param s the PDF string representing a date
* @return a Calendar representing the date or null if the string
* was not a date
*/
public static Calendar decode(String s) {
try {
if (s.startsWith("D:"))
s = s.substring(2);
GregorianCalendar calendar;
int slen = s.length();
int idx = s.indexOf('Z');
if (idx >= 0) {
slen = idx;
calendar = new GregorianCalendar(new SimpleTimeZone(0, "ZPDF"));
}
else {
int sign = 1;
idx = s.indexOf('+');
if (idx < 0) {
idx = s.indexOf('-');
if (idx >= 0)
sign = -1;
}
if (idx < 0)
calendar = new GregorianCalendar();
else {
int offset = Integer.parseInt(s.substring(idx + 1, idx + 3)) * 60;
if (idx + 5 < s.length())
offset += Integer.parseInt(s.substring(idx + 4, idx + 6));
calendar = new GregorianCalendar(new SimpleTimeZone(offset * sign * 60000, "ZPDF"));
slen = idx;
}
}
calendar.clear();
idx = 0;
for (int k = 0; k < dateSpace.length; k += 3) {
if (idx >= slen)
break;
calendar.set(dateSpace[k], Integer.parseInt(s.substring(idx, idx + dateSpace[k + 1])) + dateSpace[k + 2]);
idx += dateSpace[k + 1];
}
return calendar;
}
catch (Exception e) {
return null;
}
}
}