cvs commit: jakarta-james/src/java/org/apache/james/util RFC822Date.java

[da...@apache.org]

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) <Da...@thought.co.uk><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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