annualdaterule.java

来自「JfreeChart 常用图表例子」· Java 代码 · 共 82 行

/* ===================================================
 * JCommon : a free general purpose Java class library
 * ===================================================
 *
 * Project Info:  http://www.jfree.org/jcommon/index.html
 * Project Lead:  David Gilbert ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
 *
 * 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., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * -------------------
 * AnnualDateRule.java
 * -------------------
 * (C) Copyright 2000-2003, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: AnnualDateRule.java,v 1.2 2005/06/01 14:12:28 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();
    }

}