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jfreechart example source code file (DateTickUnit.java)

This example jfreechart source code file (DateTickUnit.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, datetickunit, datetickunit, datetickunittype, datetickunittype, day, hour, illegalargumentexception, illegalargumentexception, io, minute, month, string, text, util

The jfreechart DateTickUnit.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2009, 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.]
 *
 * -----------------
 * DateTickUnit.java
 * -----------------
 * (C) Copyright 2000-2009, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Chris Boek;
 *
 * Changes
 * -------
 * 08-Nov-2002 : Moved to new package com.jrefinery.chart.axis (DG);
 * 27-Nov-2002 : Added IllegalArgumentException to getMillisecondCount()
 *               method (DG);
 * 26-Mar-2003 : Implemented Serializable (DG);
 * 12-Nov-2003 : Added roll fields that can improve the labelling on segmented
 *               date axes (DG);
 * 03-Dec-2003 : DateFormat constructor argument is now filled with an default
 *               if null (TM);
 * 07-Dec-2003 : Fixed bug (null pointer exception) in constructor (DG);
 * ------------- JFREECHART 1.0.x ---------------------------------------------
 * 21-Mar-2007 : Added toString() for debugging (DG);
 * 04-Apr-2007 : Added new methods addToDate(Date, TimeZone) and rollDate(Date,
 *               TimeZone) (CB);
 * 09-Jun-2008 : Deprecated addToDate(Date) (DG);
 * 09-Jan-2009 : Replaced the unit and rollUnit fields with an enumerated
 *               type (DG);
 *
 */

package org.jfree.chart.axis;

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

import org.jfree.util.ObjectUtilities;

/**
 * A tick unit for use by subclasses of {@link DateAxis}.  Instances of this
 * class are immutable.
 */
public class DateTickUnit extends TickUnit implements Serializable {

    /** For serialization. */
    private static final long serialVersionUID = -7289292157229621901L;

    /**
     * The units.
     *
     * @since 1.0.13
     */
    private DateTickUnitType unitType;

    /** The unit count. */
    private int count;

    /**
     * The roll unit type.
     *
     * @since 1.0.13
     */
    private DateTickUnitType rollUnitType;

    /** The roll count. */
    private int rollCount;

    /** The date formatter. */
    private DateFormat formatter;

    /**
     * Creates a new date tick unit.
     *
     * @param unitType  the unit type (<code>null not permitted).
     * @param multiple  the multiple (of the unit type, must be > 0).
     *
     * @since 1.0.13
     */
    public DateTickUnit(DateTickUnitType unitType, int multiple) {
        this(unitType, multiple, DateFormat.getDateInstance(DateFormat.SHORT));
    }

    /**
     * Creates a new date tick unit.
     *
     * @param unitType  the unit type (<code>null not permitted).
     * @param multiple  the multiple (of the unit type, must be > 0).
     * @param formatter  the date formatter (<code>null not permitted).
     *
     * @since 1.0.13
     */
    public DateTickUnit(DateTickUnitType unitType, int multiple,
            DateFormat formatter) {
        this(unitType, multiple, unitType, multiple, formatter);
    }

    /**
     * Creates a new unit.
     *
     * @param unitType  the unit.
     * @param multiple  the multiple.
     * @param rollUnitType  the roll unit.
     * @param rollMultiple  the roll multiple.
     * @param formatter  the date formatter (<code>null not permitted).
     *
     * @since 1.0.13
     */
    public DateTickUnit(DateTickUnitType unitType, int multiple,
            DateTickUnitType rollUnitType, int rollMultiple,
            DateFormat formatter) {
        super(DateTickUnit.getMillisecondCount(unitType, multiple));
        if (formatter == null) {
            throw new IllegalArgumentException("Null 'formatter' argument.");
        }
        if (multiple <= 0) {
            throw new IllegalArgumentException("Requires 'multiple' > 0.");
        }
        if (rollMultiple <= 0) {
            throw new IllegalArgumentException("Requires 'rollMultiple' > 0.");
        }
        this.unitType = unitType;
        this.count = multiple;
        this.rollUnitType = rollUnitType;
        this.rollCount = rollMultiple;
        this.formatter = formatter;

        // populate deprecated fields
        this.unit = unitTypeToInt(unitType);
        this.rollUnit = unitTypeToInt(rollUnitType);
    }

    /**
     * Returns the unit type.
     *
     * @return The unit type (never <code>null).
     *
     * @since 1.0.13
     */
    public DateTickUnitType getUnitType() {
        return this.unitType;
    }

    /**
     * Returns the unit multiple.
     *
     * @return The unit multiple (always > 0).
     */
    public int getMultiple() {
        return this.count;
    }

    /**
     * Returns the roll unit type.
     *
     * @return The roll unit type (never <code>null).
     *
     * @since 1.0.13
     */
    public DateTickUnitType getRollUnitType() {
        return this.rollUnitType;
    }

    /**
     * Returns the roll unit multiple.
     *
     * @return The roll unit multiple.
     *
     * @since 1.0.13
     */
    public int getRollMultiple() {
        return this.rollCount;
    }

    /**
     * Formats a value.
     *
     * @param milliseconds  date in milliseconds since 01-01-1970.
     *
     * @return The formatted date.
     */
    public String valueToString(double milliseconds) {
        return this.formatter.format(new Date((long) milliseconds));
    }

    /**
     * Formats a date using the tick unit's formatter.
     *
     * @param date  the date.
     *
     * @return The formatted date.
     */
    public String dateToString(Date date) {
        return this.formatter.format(date);
    }

    /**
     * Calculates a new date by adding this unit to the base date.
     *
     * @param base  the base date.
     * @param zone  the time zone for the date calculation.
     *
     * @return A new date one unit after the base date.
     *
     * @since 1.0.6
     */
    public Date addToDate(Date base, TimeZone zone) {
        // as far as I know, the Locale for the calendar only affects week
        // number calculations, and since DateTickUnit doesn't do week
        // arithmetic, the default locale (whatever it is) should be fine
        // here...
        Calendar calendar = Calendar.getInstance(zone);
        calendar.setTime(base);
        calendar.add(this.unitType.getCalendarField(), this.count);
        return calendar.getTime();
    }

    /**
     * Rolls the date forward by the amount specified by the roll unit and
     * count.
     *
     * @param base  the base date.

     * @return The rolled date.
     *
     * @see #rollDate(Date, TimeZone)
     */
    public Date rollDate(Date base) {
        return rollDate(base, TimeZone.getDefault());
    }

    /**
     * Rolls the date forward by the amount specified by the roll unit and
     * count.
     *
     * @param base  the base date.
     * @param zone  the time zone.
     *
     * @return The rolled date.
     *
     * @since 1.0.6
     */
    public Date rollDate(Date base, TimeZone zone) {
        // as far as I know, the Locale for the calendar only affects week
        // number calculations, and since DateTickUnit doesn't do week
        // arithmetic, the default locale (whatever it is) should be fine
        // here...
        Calendar calendar = Calendar.getInstance(zone);
        calendar.setTime(base);
        calendar.add(this.rollUnitType.getCalendarField(), this.rollCount);
        return calendar.getTime();
    }

    /**
     * Returns a field code that can be used with the <code>Calendar
     * class.
     *
     * @return The field code.
     */
    public int getCalendarField() {
        return this.unitType.getCalendarField();
    }

    /**
     * Returns the (approximate) number of milliseconds for the given unit and
     * unit count.
     * <P>
     * This value is an approximation some of the time (e.g. months are
     * assumed to have 31 days) but this shouldn't matter.
     *
     * @param unit  the unit.
     * @param count  the unit count.
     *
     * @return The number of milliseconds.
     *
     * @since 1.0.13
     */
    private static long getMillisecondCount(DateTickUnitType unit, int count) {

        if (unit.equals(DateTickUnitType.YEAR)) {
            return (365L * 24L * 60L * 60L * 1000L) * count;
        }
        else if (unit.equals(DateTickUnitType.MONTH)) {
            return (31L * 24L * 60L * 60L * 1000L) * count;
        }
        else if (unit.equals(DateTickUnitType.DAY)) {
            return (24L * 60L * 60L * 1000L) * count;
        }
        else if (unit.equals(DateTickUnitType.HOUR)) {
            return (60L * 60L * 1000L) * count;
        }
        else if (unit.equals(DateTickUnitType.MINUTE)) {
            return (60L * 1000L) * count;
        }
        else if (unit.equals(DateTickUnitType.SECOND)) {
            return 1000L * count;
        }
        else if (unit.equals(DateTickUnitType.MILLISECOND)) {
            return count;
        }
        else {
            throw new IllegalArgumentException("The 'unit' argument has a " +
            		"value that is not recognised.");
        }

    }

    /**
     * A utility method that is used internally to convert the old unit
     * constants into the corresponding enumerated value.
     *
     * @param unit  the unit specified using the deprecated integer codes.
     *
     * @return The unit type.
     *
     * @since 1.0.13
     */
    private static DateTickUnitType intToUnitType(int unit) {
        switch (unit) {
            case YEAR: return DateTickUnitType.YEAR;
            case MONTH: return DateTickUnitType.MONTH;
            case DAY: return DateTickUnitType.DAY;
            case HOUR: return DateTickUnitType.HOUR;
            case MINUTE: return DateTickUnitType.MINUTE;
            case SECOND: return DateTickUnitType.SECOND;
            case MILLISECOND: return DateTickUnitType.MILLISECOND;
            default: throw new IllegalArgumentException(
                    "Unrecognised 'unit' value " + unit + ".");
        }
    }

    /**
     * Converts a unit type to the corresponding deprecated integer constant.
     *
     * @param unitType  the unit type (<code>null not permitted).
     *
     * @return The int code.
     *
     * @since 1.0.13
     */
    private static int unitTypeToInt(DateTickUnitType unitType) {
        if (unitType == null) {
            throw new IllegalArgumentException("Null 'unitType' argument.");
        }
        if (unitType.equals(DateTickUnitType.YEAR)) {
            return YEAR;
        }
        else if (unitType.equals(DateTickUnitType.MONTH)) {
            return MONTH;
        }
        else if (unitType.equals(DateTickUnitType.DAY)) {
            return DAY;
        }
        else if (unitType.equals(DateTickUnitType.HOUR)) {
            return HOUR;
        }
        else if (unitType.equals(DateTickUnitType.MINUTE)) {
            return MINUTE;
        }
        else if (unitType.equals(DateTickUnitType.SECOND)) {
            return SECOND;
        }
        else if (unitType.equals(DateTickUnitType.MILLISECOND)) {
            return MILLISECOND;
        }
        else {
            throw new IllegalArgumentException(
                    "The 'unitType' is not recognised");
        }
    }

    /**
     * A utility method to put a default in place if a null formatter is
     * supplied.
     *
     * @param formatter  the formatter (<code>null permitted).
     *
     * @return The formatter if it is not null, otherwise a default.
     */
    private static DateFormat notNull(DateFormat formatter) {
        if (formatter == null) {
            return DateFormat.getDateInstance(DateFormat.SHORT);
        }
        else {
            return formatter;
        }
    }

    /**
     * Tests this unit for equality with another object.
     *
     * @param obj  the object (<code>null permitted).
     *
     * @return <code>true or false.
     */
    public boolean equals(Object obj) {
        if (obj == this) {
            return true;
        }
        if (!(obj instanceof DateTickUnit)) {
            return false;
        }
        if (!super.equals(obj)) {
            return false;
        }
        DateTickUnit that = (DateTickUnit) obj;
        if (!(this.unitType.equals(that.unitType))) {
            return false;
        }
        if (this.count != that.count) {
            return false;
        }
        if (!ObjectUtilities.equal(this.formatter, that.formatter)) {
            return false;
        }
        return true;
    }

    /**
     * Returns a hash code for this object.
     *
     * @return A hash code.
     */
    public int hashCode() {
        int result = 19;
        result = 37 * result + this.unitType.hashCode();
        result = 37 * result + this.count;
        result = 37 * result + this.formatter.hashCode();
        return result;
    }

    /**
     * Returns a string representation of this instance, primarily used for
     * debugging purposes.
     *
     * @return A string representation of this instance.
     */
    public String toString() {
        return "DateTickUnit[" + this.unitType.toString() + ", "
                + this.count + "]";
    }

    /**
     * A constant for years.
     *
     * @deprecated As of version 1.0.13, use {@link DateTickUnitType} instead.
     */
    public static final int YEAR = 0;

    /**
     * A constant for months.
     *
     * @deprecated As of version 1.0.13, use {@link DateTickUnitType} instead.
     */
    public static final int MONTH = 1;

    /**
     * A constant for days.
     *
     * @deprecated As of version 1.0.13, use {@link DateTickUnitType} instead.
     */
    public static final int DAY = 2;

    /**
     * A constant for hours.
     *
     * @deprecated As of version 1.0.13, use {@link DateTickUnitType} instead.
     */
    public static final int HOUR = 3;

    /**
     * A constant for minutes.
     *
     * @deprecated As of version 1.0.13, use {@link DateTickUnitType} instead.
     */
    public static final int MINUTE = 4;

    /**
     * A constant for seconds.
     *
     * @deprecated As of version 1.0.13, use {@link DateTickUnitType} instead.
     */
    public static final int SECOND = 5;

    /**
     * A constant for milliseconds.
     *
     * @deprecated As of version 1.0.13, use {@link DateTickUnitType} instead.
     */
    public static final int MILLISECOND = 6;

    /**
     * The unit.
     *
     * @deprecated As of version 1.0.13, use the unitType field.
     */
    private int unit;

    /**
     * The roll unit.
     *
     * @deprecated As of version 1.0.13, use the rollUnitType field.
     */
    private int rollUnit;

    /**
     * Creates a new date tick unit.  You can specify the units using one of
     * the constants YEAR, MONTH, DAY, HOUR, MINUTE, SECOND or MILLISECOND.
     * In addition, you can specify a unit count, and a date format.
     *
     * @param unit  the unit.
     * @param count  the unit count.
     * @param formatter  the date formatter (defaults to DateFormat.SHORT).
     *
     * @deprecated As of version 1.0.13, use {@link #DateTickUnit(
     *     DateTickUnitType, int, DateFormat)}.
     */
    public DateTickUnit(int unit, int count, DateFormat formatter) {
        this(unit, count, unit, count, formatter);
    }

    /**
     * Creates a new date tick unit.  The dates will be formatted using a
     * SHORT format for the default locale.
     *
     * @param unit  the unit.
     * @param count  the unit count.
     *
     * @deprecated As of version 1.0.13, use {@link #DateTickUnit(
     *     DateTickUnitType, int)}.
     */
    public DateTickUnit(int unit, int count) {
        this(unit, count, null);
    }

    /**
     * Creates a new unit.
     *
     * @param unit  the unit.
     * @param count  the count.
     * @param rollUnit  the roll unit.
     * @param rollCount  the roll count.
     * @param formatter  the date formatter (defaults to DateFormat.SHORT).
     *
     * @deprecated As of version 1.0.13, use {@link #DateTickUnit(
     *     DateTickUnitType, int, DateTickUnitType, int, DateFormat)}.
     */
    public DateTickUnit(int unit, int count, int rollUnit, int rollCount,
                        DateFormat formatter) {
        this(intToUnitType(unit), count, intToUnitType(rollUnit), rollCount,
                notNull(formatter));
    }

    /**
     * Returns the date unit.  This will be one of the constants
     * <code>YEAR, MONTH, DAY,
     * <code>HOUR, MINUTE, SECOND or
     * <code>MILLISECOND, defined by this class.  Note that these
     * constants do NOT correspond to those defined in Java's
     * <code>Calendar class.
     *
     * @return The date unit.
     *
     * @deprecated As of 1.0.13, use the getUnitType() method.
     */
    public int getUnit() {
        return this.unit;
    }

    /**
     * Returns the unit count.
     *
     * @return The unit count.
     *
     * @deprecated As of version 1.0.13, use {@link #getMultiple()}.
     */
    public int getCount() {
        return this.count;
    }

    /**
     * Returns the roll unit.  This is the amount by which the tick advances if
     * it is "hidden" when displayed on a segmented date axis.  Typically the
     * roll will be smaller than the regular tick unit (for example, a 7 day
     * tick unit might use a 1 day roll).
     *
     * @return The roll unit.
     *
     * @deprecated As of version 1.0.13, use {@link #getRollUnitType()}.
     */
    public int getRollUnit() {
        return this.rollUnit;
    }

    /**
     * Returns the roll count.
     *
     * @return The roll count.
     *
     * @deprecated As of version 1.0.13, use the {@link #getRollMultiple()}
     *
     */
    public int getRollCount() {
        return this.rollCount;
    }

    /**
     * Calculates a new date by adding this unit to the base date, with
     * calculations performed in the default timezone and locale.
     *
     * @param base  the base date.
     *
     * @return A new date one unit after the base date.
     *
     * @see #addToDate(Date, TimeZone)
     *
     * @deprecated As of JFreeChart 1.0.10, this method is deprecated - you
     *     should use {@link #addToDate(Date, TimeZone)} instead.
     */
    public Date addToDate(Date base) {
        return addToDate(base, TimeZone.getDefault());
    }

}

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