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package com.sun.xml.ws.transport.http.client;
import java.text.SimpleDateFormat;
import java.text.ParseException;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
/**
* A parser for date strings commonly found in http and email headers that
* follow various RFC conventions. Given a date-string, the parser will
* attempt to parse it by trying matches with a set of patterns, returning
* null on failure, a Date object on success.
*
* @author WS Development Team
*/
final class RfcDateParser {
private boolean isGMT = false;
static final String[] standardFormats =
{ "EEEE', 'dd-MMM-yy HH:mm:ss z", // RFC 850 (obsoleted by 1036)
"EEEE', 'dd-MMM-yy HH:mm:ss", // ditto but no tz. Happens too often
"EEE', 'dd-MMM-yyyy HH:mm:ss z", // RFC 822/1123
"EEE', 'dd MMM yyyy HH:mm:ss z", // REMIND what rfc? Apache/1.1
"EEEE', 'dd MMM yyyy HH:mm:ss z", // REMIND what rfc? Apache/1.1
"EEE', 'dd MMM yyyy hh:mm:ss z", // REMIND what rfc? Apache/1.1
"EEEE', 'dd MMM yyyy hh:mm:ss z", // REMIND what rfc? Apache/1.1
"EEE MMM dd HH:mm:ss z yyyy", // Date's string output format
"EEE MMM dd HH:mm:ss yyyy", // ANSI C asctime format()
"EEE', 'dd-MMM-yy HH:mm:ss", // No time zone 2 digit year RFC 1123
"EEE', 'dd-MMM-yyyy HH:mm:ss" // No time zone RFC 822/1123
};
static final String[] gmtStandardFormats =
{ "EEEE',' dd-MMM-yy HH:mm:ss 'GMT'", // RFC 850 (obsoleted by 1036)
"EEE',' dd-MMM-yyyy HH:mm:ss 'GMT'", // RFC 822/1123
"EEE',' dd MMM yyyy HH:mm:ss 'GMT'", // REMIND what rfc? Apache/1.1
"EEEE',' dd MMM yyyy HH:mm:ss 'GMT'", // REMIND what rfc? Apache/1.1
"EEE',' dd MMM yyyy hh:mm:ss 'GMT'", // REMIND what rfc? Apache/1.1
"EEEE',' dd MMM yyyy hh:mm:ss 'GMT'", // REMIND what rfc? Apache/1.1
"EEE MMM dd HH:mm:ss 'GMT' yyyy" // Date's string output format
};
String dateString;
public RfcDateParser(String dateString) {
this.dateString = dateString.trim();
if (this.dateString.indexOf("GMT") != -1) {
isGMT = true;
}
}
public Date getDate() {
// format is wdy, DD-Mon-yyyy HH:mm:ss GMT
int arrayLen =
isGMT ? gmtStandardFormats.length : standardFormats.length;
for (int i = 0; i < arrayLen; i++) {
Date d;
if (isGMT) {
d = tryParsing(gmtStandardFormats[i]);
} else {
d = tryParsing(standardFormats[i]);
}
if (d != null) {
return d;
}
}
return null;
}
private Date tryParsing(String format) {
SimpleDateFormat df = new SimpleDateFormat(format, Locale.US);
if (isGMT) {
df.setTimeZone(TimeZone.getTimeZone("GMT"));
}
try {
return df.parse(dateString);
} catch (ParseException e) {
return null;
}
}
}
