danny 01/10/03 02:52:44
Added: src/java/org/apache/james/util RFC822Date.java
Log:
Added utility class for converting RFC822 dates into java.util.Date, and vice versa.
Revision Changes Path
1.1 jakarta-james/src/java/org/apache/james/util/RFC822Date.java
Index: RFC822Date.java
===================================================================
/*
* Copyright (C) The Apache Software Foundation. All rights reserved.
*
* This software is published under the terms of the Apache Software License
* version 1.1, a copy of which has been included with this distribution in
* the LICENSE file.
*/
package org.apache.james.util;
import java.text.DateFormat;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
/**
* A utility class to allow creation of RFC822 date strings from Dates<br>
* and dates from RFC822 strings<br>
* It provides for conversion between timezones<br>
* And easy manipulation of RFC822 dates<br>
* example - current timestamp: String nowdate = new RFC822Date().toString()<br>
* example - convert into java.util.Date: Date usedate = new RFC822Date("3 Oct 2001
08:32:44 -0000").getDate()<br>
* example - convert to timezone: String yourdate = new RFC822Date("3 Oct 2001
08:32:44 -0000", "GMT+02:00").toString()<br>
* example - convert to local timezone: String mydate = new RFC822Date("3 Oct 2001
08:32:44 -0000").toString()<br>
* @author Danny Angus (danny) <[EMAIL PROTECTED]><br>
*/
public class RFC822Date {
private static DateFormat df;
private static SimpleDateFormat dx;
private static DecimalFormat tz;
private TimeZone defaultTZ;
private Date d;
static {
df = new SimpleDateFormat("EE, d MMM yyyy HH:mm:ss", Locale.US);
dx = new SimpleDateFormat("EE, d MMM yyyy HH:mm:ss zzzzz", Locale.US);
tz = new DecimalFormat("00");
}
/**
* creates a current timestamp <br>
* using this machines system timezone<br>
*
*/
public RFC822Date(){
d = new Date();
defaultTZ = TimeZone.getDefault();
}
/**
* creates object using date supplied <br>
* and this machines system timezone<br>
* @param da java.util.Date, A date object
*/
public RFC822Date(Date da){
d = da;
defaultTZ = TimeZone.getDefault();
}
/**
* creates object using date supplied<br>
* and the timezone string supplied<br>
* useTZ can be either an abbreviation such as "PST",
* a full name such as "America/Los_Angeles",<br>
* or a custom ID such as "GMT-8:00".<br>
* Note that this is dependant on java.util.TimeZone<br>
* Note that the support of abbreviations is for
* JDK 1.1.x compatibility only and full names should be used.<br>
* @param da java.util.Date, a date object
* @param useTZ java.lang.Sting, a timezone string such as
"America/Los_Angeles" or "GMT+02:00"
*/
public RFC822Date(Date da, String useTZ){
d = da;
defaultTZ = TimeZone.getTimeZone(useTZ);
}
/**
* creates object from
* RFC822 date string supplied<br>
* and the system default time zone <br>
* In practice it converts RFC822 date string to the local timezone<br>
* @param rfcdate java.lang.String, date in RFC822 format "3 Oct 2001 08:32:44
-0000"
*/
public RFC822Date(String rfcdate){
setDate(rfcdate);
defaultTZ = TimeZone.getDefault();
}
/**
* creates object from
* RFC822 date string supplied<br>
* using the supplied time zone string<br>
* @param rfcdate java.lang.String, date in RFC822 format
* @param useTZ java.lang.String, timezone string
*/
public RFC822Date(String rfcdate, String useTZ){
setDate(rfcdate);
defaultTZ = TimeZone.getTimeZone(useTZ);
}
public void setDate(Date da){
d = da;
}
public void setDate(String rfcdate){
try{
d= dx.parse(rfcdate);
}catch(Exception e){
System.out.println("date error" + e);
}
}
public void setTimeZone(TimeZone useTZ){
defaultTZ = useTZ;
}
public void setTimeZone(String useTZ){
defaultTZ = TimeZone.getTimeZone(useTZ);
}
/**
* returns the java.util.Date object this RFC822Date represents.
* @return java.util.Date
*/
public Date getDate(){
return d;
}
/**
* returns the date as a string formated for RFC822 compliance
* ,accounting for timezone and daylight saving.
* @return java.lang.String
*
*/
public String toString() {
StringBuffer sb = new StringBuffer(df.format(d));
sb.append(' ');
int min = defaultTZ.getRawOffset() / 1000 / 60;
if (defaultTZ.useDaylightTime() && defaultTZ.inDaylightTime(d)) {
min += 60;
}
if (min >= 0) {
sb.append('+');
} else {
sb.append('-');
}
min = Math.abs(min);
sb.append(tz.format(min / 60));
sb.append(tz.format(min % 60));
return sb.toString();
}
}
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