content: /* ========================================================================
   * JCommon : a free general purpose class library for the Java(tm) platform
   * ========================================================================
   *
   * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
   * 
   * Project Info:  http://www.jfree.org/jcommon/index.html
   *
   * This library is free software; you can redistribute it and/or modify it 
   * under the terms of the GNU Lesser General Public License as published by 
   * the Free Software Foundation; either version 2.1 of the License, or 
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but 
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
   * USA.  
   *
   * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
   * in the United States and other countries.]
   *
   * -------------------
   * AnnualDateRule.java
   * -------------------
   * (C) Copyright 2000-2003, by Object Refinery Limited.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * $Id: AnnualDateRule.java,v 1.4 2005/11/16 15:58:40 taqua Exp $
   *
   * Changes (from 26-Oct-2001)
   * --------------------------
   * 26-Oct-2001 : Changed package to com.jrefinery.date.* (DG);
   * 12-Nov-2001 : Javadoc comments updated (DG);
   * 03-Oct-2002 : Fixed errors reported by Checkstyle (DG);
   *
   */
  
  package org.jfree.date;
  
  /**
   * The base class for all 'annual' date rules: that is, rules for generating
   * one date for any given year.
   * <P>
   * One example is Easter Sunday (which can be calculated using published algorithms).
   *
   * @author David Gilbert
   */
  public abstract class AnnualDateRule implements Cloneable {
  
      /**
       * Default constructor.
       */
      protected AnnualDateRule() {
      }
  
      /**
       * Returns the date for this rule, given the year.
       *
       * @param year  the year (1900 &lt;= year &lt;= 9999).
       *
       * @return the date for this rule, given the year.
       */
      public abstract SerialDate getDate(int year);
  
      /**
       * Returns a clone of the rule.
       * <P>
       * You should refer to the documentation of the clone() method in each
       * subclass for exact details.
       *
       * @return a clone of the rule.
       *
       * @throws CloneNotSupportedException if the rule is not clonable.
       */
      public Object clone() throws CloneNotSupportedException {
          return super.clone();
      }
  
  }
  