relativedate.java

一个完整的XACML工程,学习XACML技术的好例子!

/*
* Copyright (c) 2000-2005, University of Salford
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without 
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*
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* list of conditions and the following disclaimer.
* 
* Redistributions in binary form must reproduce the above copyright notice, 
* this list of conditions and the following disclaimer in the documentation 
* and/or other materials provided with the distribution. 
*
* Neither the name of the University of Salford nor the names of its 
* contributors may be used to endorse or promote products derived from this 
* software without specific prior written permission. 
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
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package issrg.pba.rbac;

/**
 * This class is just a holder of relative year, month, day, etc integers. It is 
 * used as
 * a pack of integers for calculating relative validity periods.
 *
 * @author A.Otenko
 */

public class RelativeDate {

  public int years;
  public int months;
  public int days;
  public int hours;
  public int minutes;
  public int seconds;

  /**
   * This constructor builds the RelativeDate using the number of years, months
   * days, hours, minutes and seconds from now. The direction of increment (i.e.
   * should they be added or subtracted from now) depends on the context, e.g.
   * they are subtracted from now to compute Age, but added to compute min and
   * max life span.
   */
  public RelativeDate(int years, int months, int days, int hours, int minutes, int seconds) {
    this.years=years;
    this.months=months;
    this.days=days;
    this.hours=hours;
    this.minutes=minutes;
    this.seconds=seconds;
  }

  /**
   * This method returns the date as if it were counted from 0 AD.
   */
  public java.util.Date getDate(){
    java.util.Calendar c = new java.util.GregorianCalendar();
    c.set(c.ZONE_OFFSET, 0);
    c.set(c.DST_OFFSET, 0);

    c.set(years, months, days, hours, minutes, seconds);
    c.set(c.MILLISECOND, 0);

    return c.getTime();
  }

  public String toString(){
    return "relative date "
            +((years>=0)?"+":"")+years
            +((months>=0)?"+":"")+months
            +((days>=0)?"+":"")+days
            +" "+((hours>=0)?"+":"")+hours
            +((minutes>=0)?"+":"")+minutes
            +((seconds>=0)?"+":"")+seconds
    ;
  }
}