/* ===========================================================
* 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.]
*
* -----------------
* DateTickUnit.java
* -----------------
* (C) Copyright 2000-2007, 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);
*
*/
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;
/** A constant for years. */
public static final int YEAR = 0;
/** A constant for months. */
public static final int MONTH = 1;
/** A constant for days. */
public static final int DAY = 2;
/** A constant for hours. */
public static final int HOUR = 3;
/** A constant for minutes. */
public static final int MINUTE = 4;
/** A constant for seconds. */
public static final int SECOND = 5;
/** A constant for milliseconds. */
public static final int MILLISECOND = 6;
/** The unit. */
private int unit;
/** The unit count. */
private int count;
/** The roll unit. */
private int rollUnit;
/** The roll count. */
private int rollCount;
/** The date formatter. */
private DateFormat 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.
*/
public DateTickUnit(int unit, int count) {
this(unit, count, null);
}
/**
* 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).
*/
public DateTickUnit(int unit, int count, DateFormat formatter) {
this(unit, count, unit, count, formatter);
}
/**
* 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).
*/
public DateTickUnit(int unit, int count, int rollUnit, int rollCount,
DateFormat formatter) {
super(DateTickUnit.getMillisecondCount(unit, count));
this.unit = unit;
this.count = count;
this.rollUnit = rollUnit;
this.rollCount = rollCount;
this.formatter = formatter;
if (formatter == null) {
this.formatter = DateFormat.getDateInstance(DateFormat.SHORT);
}
}
/**
* Returns the date unit. This will be one of the constants
* <code>YEAR</code>, <code>MONTH</code>, <code>DAY</code>,
* <code>HOUR</code>, <code>MINUTE</code>, <code>SECOND</code> or
* <code>MILLISECOND</code>, defined by this class. Note that these
* constants do NOT correspond to those defined in Java's
* <code>Calendar</code> class.
*
* @return The date unit.
*/
public int getUnit() {
return this.unit;
}
/**
* Returns the unit count.
*
* @return The unit count.
*/
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.
*/
public int getRollUnit() {
return this.rollUnit;
}
/**
* Returns the roll count.
*
* @return The roll count.
*/
public int getRollCount() {
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.
*
* @return A new date one unit after the base date.
*
* @see #addToDate(Date, TimeZone)
*/
public Date addToDate(Date base) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(base);
calendar.add(getCalendarField(this.unit), this.count);
return calendar.getTime();
}
/**
* 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
* @see #addToDate(Date)
*/
public Date addToDate(Date base, TimeZone zone) {
Calendar calendar = Calendar.getInstance(zone);
calendar.setTime(base);
calendar.add(getCalendarField(this.unit), 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) {
Calendar calendar = Calendar.getInstance();
calendar.setTime(base);
calendar.add(getCalendarField(this.rollUnit), this.rollCount);
return calendar.getTime();
}
/**
* 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
* @see #rollDate(Date)
*/
public Date rollDate(Date base, TimeZone zone) {
Calendar calendar = Calendar.getInstance(zone);
calendar.setTime(base);
calendar.add(getCalendarField(this.rollUnit), this.rollCount);
return calendar.getTime();
}
/**
* Returns a field code that can be used with the <code>Calendar</code>
* class.
*
* @return The field code.
*/
public int getCalendarField() {
return getCalendarField(this.unit);
}
/**
* Returns a field code (that can be used with the Calendar class) for a
* given 'unit' code. The 'unit' is one of: {@link #YEAR}, {@link #MONTH},
* {@link #DAY}, {@link #HOUR}, {@link #MINUTE}, {@link #SECOND} and
* {@link #MILLISECOND}.
*
* @param tickUnit the unit.
*
* @return The field code.
*/
private int getCalendarField(int tickUnit) {
switch (tickUnit) {
case (YEAR):
return Calendar.YEAR;
case (MONTH):
return Calendar.MONTH;
case (DAY):
return Calendar.DATE;
case (HOUR):
return Calendar.HOUR_OF_DAY;
case (MINUTE):
return Calendar.MINUTE;
case (SECOND):
return Calendar.SECOND;
case (MILLISECOND):
return Calendar.MILLISECOND;
default:
return Calendar.MILLISECOND;
}
}
/**
* 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.
*/
private static long getMillisecondCount(int unit, int count) {
switch (unit) {
case (YEAR):
return (365L * 24L * 60L * 60L * 1000L) * count;
case (MONTH):
return (31L * 24L * 60L * 60L * 1000L) * count;
case (DAY):
return (24L * 60L * 60L * 1000L) * count;
case (HOUR):
return (60L * 60L * 1000L) * count;
case (MINUTE):
return (60L * 1000L) * count;
case (SECOND):
return 1000L * count;
case (MILLISECOND):
return count;
default:
throw new IllegalArgumentException(
"DateTickUnit.getMillisecondCount() : unit must "
+ "be one of the constants YEAR, MONTH, DAY, HOUR, MINUTE, "
+ "SECOND or MILLISECOND defined in the DateTickUnit "
+ "class. Do *not* use the constants defined in "
+ "java.util.Calendar."
);
}
}
/**
* Tests this unit for equality with another object.
*
* @param obj the object (<code>null</code> permitted).
*
* @return <code>true</code> or <code>false</code>.
*/
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.unit != that.unit) {
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.unit;
result = 37 * result + this.count;
result = 37 * result + this.formatter.hashCode();
return result;
}
/**
* Strings for use by the toString() method.
*/
private static final String[] units = {"YEAR", "MONTH", "DAY", "HOUR",
"MINUTE", "SECOND", "MILLISECOND"};
/**
* Returns a string representation of this instance, primarily used for
* debugging purposes.
*
* @return A string representation of this instance.
*/
public String toString() {
return "DateTickUnit[" + DateTickUnit.units[this.unit] + ", "
+ this.count + "]";
}
}
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