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jfreechart example source code file (QuarterDateFormat.java)

This example jfreechart source code file (QuarterDateFormat.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - jfreechart tags/keywords

date, gregoriancalendar, ii, iii, io, parseposition, quarterdateformat, quarterdateformat, regular_quarters, regular_quarters, serializable, string, string, stringbuffer, stringbuffer, text, util

The jfreechart QuarterDateFormat.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, 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.]
 *
 * ----------------------
 * QuarterDateFormat.java
 * ----------------------
 * (C) Copyright 2005-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 01-Mar-2005 : Version 1 (DG);
 * 10-May-2005 : Added equals() method, and implemented Cloneable and
 *               Serializable (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 08-Jun-2007 : Added Greek symbols, and support for reversing the date - see
 *               patch 1577221 (DG);
 *
 */

package org.jfree.chart.axis;

import java.io.Serializable;
import java.text.DateFormat;
import java.text.FieldPosition;
import java.text.NumberFormat;
import java.text.ParsePosition;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;

/**
 * A formatter that formats dates to show the year and quarter (for example,
 * '2004 IV' for the last quarter of 2004.
 */
public class QuarterDateFormat extends DateFormat
        implements Cloneable, Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -6738465248529797176L;

    /** Symbols for regular quarters. */
    public static final String[] REGULAR_QUARTERS = new String[] {"1", "2",
            "3", "4"};

    /** Symbols for roman numbered quarters. */
    public static final String[] ROMAN_QUARTERS  = new String[] {"I", "II",
            "III", "IV"};

    /**
     * Symbols for greek numbered quarters.
     *
     * @since 1.0.6
     */
    public static final String[] GREEK_QUARTERS = new String[] {"\u0391",
            "\u0392", "\u0393", "\u0394"};

    /** The strings. */
    private String[] quarters = REGULAR_QUARTERS;

    /** A flag that controls whether the quarter or the year goes first. */
    private boolean quarterFirst;

    /**
     * Creates a new instance for the default time zone.
     */
    public QuarterDateFormat() {
        this(TimeZone.getDefault());
    }

    /**
     * Creates a new instance for the specified time zone.
     *
     * @param zone  the time zone (<code>null not permitted).
     */
    public QuarterDateFormat(TimeZone zone) {
        this(zone, REGULAR_QUARTERS);
    }

    /**
     * Creates a new instance for the specified time zone.
     *
     * @param zone  the time zone (<code>null not permitted).
     * @param quarterSymbols  the quarter symbols.
     */
    public QuarterDateFormat(TimeZone zone, String[] quarterSymbols) {
        this(zone, quarterSymbols, false);
    }

    /**
     * Creates a new instance for the specified time zone.
     *
     * @param zone  the time zone (<code>null not permitted).
     * @param quarterSymbols  the quarter symbols.
     * @param quarterFirst  a flag that controls whether the quarter or the
     *         year is displayed first.
     *
     * @since 1.0.6
     */
    public QuarterDateFormat(TimeZone zone, String[] quarterSymbols,
            boolean quarterFirst) {
        if (zone == null) {
            throw new IllegalArgumentException("Null 'zone' argument.");
        }
        this.calendar = new GregorianCalendar(zone);
        this.quarters = quarterSymbols;
        this.quarterFirst = quarterFirst;

        // the following is never used, but it seems that DateFormat requires
        // it to be non-null.  It isn't well covered in the spec, refer to
        // bug parade 5061189 for more info.
        this.numberFormat = NumberFormat.getNumberInstance();

    }

    /**
     * Formats the given date.
     *
     * @param date  the date.
     * @param toAppendTo  the string buffer.
     * @param fieldPosition  the field position.
     *
     * @return The formatted date.
     */
    public StringBuffer format(Date date, StringBuffer toAppendTo,
                               FieldPosition fieldPosition) {
        this.calendar.setTime(date);
        int year = this.calendar.get(Calendar.YEAR);
        int month = this.calendar.get(Calendar.MONTH);
        int quarter = month / 3;
        if (this.quarterFirst) {
            toAppendTo.append(this.quarters[quarter]);
            toAppendTo.append(" ");
            toAppendTo.append(year);
        }
        else {
            toAppendTo.append(year);
            toAppendTo.append(" ");
            toAppendTo.append(this.quarters[quarter]);
        }
        return toAppendTo;
    }

    /**
     * Parses the given string (not implemented).
     *
     * @param source  the date string.
     * @param pos  the parse position.
     *
     * @return <code>null, as this method has not been implemented.
     */
    public Date parse(String source, ParsePosition pos) {
        return null;
    }

    /**
     * Tests this formatter for equality with an arbitrary object.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof QuarterDateFormat)) {
            return false;
        }
        QuarterDateFormat that = (QuarterDateFormat) obj;
        if (!Arrays.equals(this.quarters, that.quarters)) {
            return false;
        }
        if (this.quarterFirst != that.quarterFirst) {
            return false;
        }
        return super.equals(obj);
    }

}

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