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jfreechart example source code file (MonthDateFormat.java)

This example jfreechart source code file (MonthDateFormat.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, dateformat, dateformat, dateformatsymbols, gregoriancalendar, locale, monthdateformat, monthdateformat, parseposition, simpledateformat, simpledateformat, string, string, stringbuffer, text, util

The jfreechart MonthDateFormat.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.]
 *
 * --------------------
 * MonthDateFormat.java
 * --------------------
 * (C) Copyright 2005-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 10-May-2005 : Version 1 (DG);
 *
 */

package org.jfree.chart.axis;

import java.text.DateFormat;
import java.text.DateFormatSymbols;
import java.text.FieldPosition;
import java.text.NumberFormat;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;
import java.util.TimeZone;

import org.jfree.data.time.Month;

/**
 * A formatter that formats dates to show the initial letter(s) of the month
 * name and, as an option, the year for the first or last month of each year.
 */
public class MonthDateFormat extends DateFormat {

    /** The symbols used for the months. */
    private String[] months;

    /** Flags that control which months will have the year appended. */
    private boolean[] showYear;

    /** The year formatter. */
    private DateFormat yearFormatter;

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

    /**
     * Creates a new instance for the specified time zone.
     *
     * @param zone  the time zone (<code>null not permitted).
     */
    public MonthDateFormat(TimeZone zone) {
        this(zone, Locale.getDefault(), 1, true, false);
    }

    /**
     * Creates a new instance for the specified time zone.
     *
     * @param locale  the locale used to obtain the month
     *                names (<code>null not permitted).
     */
    public MonthDateFormat(Locale locale) {
        this(TimeZone.getDefault(), locale, 1, true, false);
    }

    /**
     * Creates a new instance for the specified time zone.
     *
     * @param zone  the time zone (<code>null not permitted).
     * @param chars  the maximum number of characters to use from the month
     *               names (that are obtained from the date symbols of the
     *               default locale).  If this value is <= 0, the entire
     *               month name is used in each case.
     */
    public MonthDateFormat(TimeZone zone, int chars) {
        this(zone, Locale.getDefault(), chars, true, false);
    }

    /**
     * Creates a new instance for the specified time zone.
     *
     * @param locale  the locale (<code>null not permitted).
     * @param chars  the maximum number of characters to use from the month
     *               names (that are obtained from the date symbols of the
     *               default locale).  If this value is <= 0, the entire
     *               month name is used in each case.
     */
    public MonthDateFormat(Locale locale, int chars) {
        this(TimeZone.getDefault(), locale, chars, true, false);
    }

    /**
     * Creates a new formatter.
     *
     * @param zone  the time zone used to extract the month and year from dates
     *              passed to this formatter (<code>null not permitted).
     * @param locale  the locale used to determine the month names
     *                (<code>null not permitted).
     * @param chars  the maximum number of characters to use from the month
     *               names, or zero to indicate that the entire month name
     *               should be used.
     * @param showYearForJan  a flag that controls whether or not the year is
     *                        appended to the symbol for the first month of
     *                        each year.
     * @param showYearForDec  a flag that controls whether or not the year is
     *                        appended to the symbol for the last month of
     *                        each year.
     */
    public MonthDateFormat(TimeZone zone, Locale locale, int chars,
                           boolean showYearForJan, boolean showYearForDec) {
        this(zone, locale, chars, new boolean[] {showYearForJan, false, false,
            false, false, false, false, false, false, false, false, false,
            showYearForDec}, new SimpleDateFormat("yy"));
    }

    /**
     * Creates a new formatter.
     *
     * @param zone  the time zone used to extract the month and year from dates
     *              passed to this formatter (<code>null not permitted).
     * @param locale  the locale used to determine the month names
     *                (<code>null not permitted).
     * @param chars  the maximum number of characters to use from the month
     *               names, or zero to indicate that the entire month name
     *               should be used.
     * @param showYear  an array of flags that control whether or not the
     *                  year is displayed for a particular month.
     * @param yearFormatter  the year formatter.
     */
    public MonthDateFormat(TimeZone zone, Locale locale, int chars,
                           boolean[] showYear, DateFormat yearFormatter) {
        if (locale == null) {
            throw new IllegalArgumentException("Null 'locale' argument.");
        }
        DateFormatSymbols dfs = new DateFormatSymbols(locale);
        String[] monthsFromLocale = dfs.getMonths();
        this.months = new String[12];
        for (int i = 0; i < 12; i++) {
            if (chars > 0) {
                this.months[i] = monthsFromLocale[i].substring(0,
                        Math.min(chars, monthsFromLocale[i].length()));
            }
            else {
                this.months[i] = monthsFromLocale[i];
            }
        }
        this.calendar = new GregorianCalendar(zone);
        this.showYear = showYear;
        this.yearFormatter = yearFormatter;

        // 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 month = this.calendar.get(Calendar.MONTH);
        toAppendTo.append(this.months[month]);
        if (this.showYear[month]) {
            toAppendTo.append(this.yearFormatter.format(date));
        }
        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.
     *
     * @return A boolean.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof MonthDateFormat)) {
            return false;
        }
        if (!super.equals(obj)) {
            return false;
        }
        MonthDateFormat that = (MonthDateFormat) obj;
        if (!Arrays.equals(this.months, that.months)) {
            return false;
        }
        if (!Arrays.equals(this.showYear, that.showYear)) {
            return false;
        }
        if (!this.yearFormatter.equals(that.yearFormatter)) {
            return false;
        }
        return true;
    }

    /**
     * Some test code.
     *
     * @param args  ignored.
     */
    public static void main(String[] args) {
        MonthDateFormat mdf = new MonthDateFormat(Locale.UK, 2);
        System.out.println("UK:");
        System.out.println(mdf.format(new Month(1, 2005).getStart()));
        System.out.println(mdf.format(new Month(2, 2005).getStart()));
        System.out.println(mdf.format(new Month(3, 2005).getStart()));
        System.out.println(mdf.format(new Month(4, 2005).getStart()));
        System.out.println(mdf.format(new Month(5, 2005).getStart()));
        System.out.println(mdf.format(new Month(6, 2005).getStart()));
        System.out.println(mdf.format(new Month(7, 2005).getStart()));
        System.out.println(mdf.format(new Month(8, 2005).getStart()));
        System.out.println(mdf.format(new Month(9, 2005).getStart()));
        System.out.println(mdf.format(new Month(10, 2005).getStart()));
        System.out.println(mdf.format(new Month(11, 2005).getStart()));
        System.out.println(mdf.format(new Month(12, 2005).getStart()));
        System.out.println();

        mdf = new MonthDateFormat(Locale.GERMANY, 2);
        System.out.println("GERMANY:");
        System.out.println(mdf.format(new Month(1, 2005).getStart()));
        System.out.println(mdf.format(new Month(2, 2005).getStart()));
        System.out.println(mdf.format(new Month(3, 2005).getStart()));
        System.out.println(mdf.format(new Month(4, 2005).getStart()));
        System.out.println(mdf.format(new Month(5, 2005).getStart()));
        System.out.println(mdf.format(new Month(6, 2005).getStart()));
        System.out.println(mdf.format(new Month(7, 2005).getStart()));
        System.out.println(mdf.format(new Month(8, 2005).getStart()));
        System.out.println(mdf.format(new Month(9, 2005).getStart()));
        System.out.println(mdf.format(new Month(10, 2005).getStart()));
        System.out.println(mdf.format(new Month(11, 2005).getStart()));
        System.out.println(mdf.format(new Month(12, 2005).getStart()));
        System.out.println();

        mdf = new MonthDateFormat(Locale.FRANCE, 2);
        System.out.println("FRANCE:");
        System.out.println(mdf.format(new Month(1, 2005).getStart()));
        System.out.println(mdf.format(new Month(2, 2005).getStart()));
        System.out.println(mdf.format(new Month(3, 2005).getStart()));
        System.out.println(mdf.format(new Month(4, 2005).getStart()));
        System.out.println(mdf.format(new Month(5, 2005).getStart()));
        System.out.println(mdf.format(new Month(6, 2005).getStart()));
        System.out.println(mdf.format(new Month(7, 2005).getStart()));
        System.out.println(mdf.format(new Month(8, 2005).getStart()));
        System.out.println(mdf.format(new Month(9, 2005).getStart()));
        System.out.println(mdf.format(new Month(10, 2005).getStart()));
        System.out.println(mdf.format(new Month(11, 2005).getStart()));
        System.out.println(mdf.format(new Month(12, 2005).getStart()));
        System.out.println();

        SimpleDateFormat sdf = new SimpleDateFormat("yyyy");
        sdf.setNumberFormat(null);
    }
}

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