quarter.java

用于制作报表的中间件控件,纯java编写,还附带有数据库操作的源代码

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
 *
 * Project Info:  http://www.jfree.org/jfreechart/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.]
 *
 * ------------
 * Quarter.java
 * ------------
 * (C) Copyright 2001-2007, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 11-Oct-2001 : Version 1 (DG);
 * 18-Dec-2001 : Changed order of parameters in constructor (DG);
 * 19-Dec-2001 : Added a new constructor as suggested by Paul English (DG);
 * 29-Jan-2002 : Added a new method parseQuarter(String) (DG);
 * 14-Feb-2002 : Fixed bug in Quarter(Date) constructor (DG);
 * 26-Feb-2002 : Changed getStart(), getMiddle() and getEnd() methods to 
 *               evaluate with reference to a particular time zone (DG);
 * 19-Mar-2002 : Changed API for TimePeriod classes (DG);
 * 24-Jun-2002 : Removed main method (just test code) (DG);
 * 10-Sep-2002 : Added getSerialIndex() method (DG);
 * 07-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 10-Jan-2003 : Changed base class and method names (DG);
 * 13-Mar-2003 : Moved to com.jrefinery.data.time package, and implemented 
 *               Serializable (DG);
 * 21-Oct-2003 : Added hashCode() method (DG);
 * 10-Dec-2005 : Fixed argument checking bug (1377239) in constructor (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 05-Oct-2006 : Updated API docs (DG);
 * 06-Oct-2006 : Refactored to cache first and last millisecond values (DG);
 *
 */

package org.jfree.data.time;

import java.io.Serializable;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

import org.jfree.date.MonthConstants;
import org.jfree.date.SerialDate;

/**
 * Defines a quarter (in a given year).  The range supported is Q1 1900 to 
 * Q4 9999.  This class is immutable, which is a requirement for all 
 * {@link RegularTimePeriod} subclasses.
 */
public class Quarter extends RegularTimePeriod implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = 3810061714380888671L;
    
    /** Constant for quarter 1. */
    public static final int FIRST_QUARTER = 1;

    /** Constant for quarter 4. */
    public static final int LAST_QUARTER = 4;

    /** The first month in each quarter. */
    public static final int[] FIRST_MONTH_IN_QUARTER = {
        0, MonthConstants.JANUARY, MonthConstants.APRIL, MonthConstants.JULY, 
        MonthConstants.OCTOBER
    };

    /** The last month in each quarter. */
    public static final int[] LAST_MONTH_IN_QUARTER = {
        0, MonthConstants.MARCH, MonthConstants.JUNE, MonthConstants.SEPTEMBER, 
        MonthConstants.DECEMBER
    };

    /** The year in which the quarter falls. */
    private short year;

    /** The quarter (1-4). */
    private byte quarter;

    /** The first millisecond. */
    private long firstMillisecond;
    
    /** The last millisecond. */
    private long lastMillisecond;

    /**
     * Constructs a new Quarter, based on the current system date/time.
     */
    public Quarter() {
        this(new Date());
    }

    /**
     * Constructs a new quarter.
     *
     * @param year  the year (1900 to 9999).
     * @param quarter  the quarter (1 to 4).
     */
    public Quarter(int quarter, int year) {
        if ((quarter < FIRST_QUARTER) || (quarter > LAST_QUARTER)) {
            throw new IllegalArgumentException("Quarter outside valid range.");
        }
        this.year = (short) year;
        this.quarter = (byte) quarter;
        peg(Calendar.getInstance());
    }

    /**
     * Constructs a new quarter.
     *
     * @param quarter  the quarter (1 to 4).
     * @param year  the year (1900 to 9999).
     */
    public Quarter(int quarter, Year year) {
        if ((quarter < FIRST_QUARTER) || (quarter > LAST_QUARTER)) {
            throw new IllegalArgumentException("Quarter outside valid range.");
        }
        this.year = (short) year.getYear();
        this.quarter = (byte) quarter;
        peg(Calendar.getInstance());
    }

    /**
     * Constructs a new Quarter, based on a date/time and the default time zone.
     *
     * @param time  the date/time.
     */
    public Quarter(Date time) {
        this(time, RegularTimePeriod.DEFAULT_TIME_ZONE);
    }

    /**
     * Constructs a Quarter, based on a date/time and time zone.
     *
     * @param time  the date/time.
     * @param zone  the zone (<code>null</code> not permitted).
     */
    public Quarter(Date time, TimeZone zone) {
        Calendar calendar = Calendar.getInstance(zone);
        calendar.setTime(time);
        int month = calendar.get(Calendar.MONTH) + 1;
        this.quarter = (byte) SerialDate.monthCodeToQuarter(month);
        this.year = (short) calendar.get(Calendar.YEAR);
        peg(calendar);
    }

    /**
     * Returns the quarter.
     *
     * @return The quarter.
     */
    public int getQuarter() {
        return this.quarter;
    }

    /**
     * Returns the year.
     *
     * @return The year.
     */
    public Year getYear() {
        return new Year(this.year);
    }
    
    /**
     * Returns the year.
     * 
     * @return The year.
     * 
     * @since 1.0.3
     */
    public int getYearValue() {
        return this.year;
    }

    /**
     * Returns the first millisecond of the quarter.  This will be determined 
     * relative to the time zone specified in the constructor, or in the 
     * calendar instance passed in the most recent call to the 
     * {@link #peg(Calendar)} method.
     *
     * @return The first millisecond of the quarter.
     * 
     * @see #getLastMillisecond()
     */
    public long getFirstMillisecond() {
        return this.firstMillisecond;
    }

    /**
     * Returns the last millisecond of the quarter.  This will be 
     * determined relative to the time zone specified in the constructor, or
     * in the calendar instance passed in the most recent call to the 
     * {@link #peg(Calendar)} method.
     *
     * @return The last millisecond of the quarter.
     * 
     * @see #getFirstMillisecond()
     */
    public long getLastMillisecond() {
        return this.lastMillisecond;
    }
    
    /** 
     * Recalculates the start date/time and end date/time for this time period 
     * relative to the supplied calendar (which incorporates a time zone).
     * 
     * @param calendar  the calendar (<code>null</code> not permitted).
     * 
     * @since 1.0.3
     */