org.jfree.chart.axis.TickUnits Maven / Gradle / Ivy
Show all versions of jfreechart Show documentation
/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-present, by David Gilbert 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.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* --------------
* TickUnits.java
* --------------
* (C) Copyright 2001-present, by David Gilbert.
*
* Original Author: David Gilbert;
* Contributor(s): -;
*
*/
package org.jfree.chart.axis;
import java.io.Serializable;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* A collection of tick units, used by the {@link DateAxis} and
* {@link NumberAxis} classes.
*/
public class TickUnits implements TickUnitSource, Cloneable, Serializable {
/** For serialization. */
private static final long serialVersionUID = 1134174035901467545L;
/** Storage for the tick units. */
private List tickUnits;
/**
* Constructs a new collection of tick units.
*/
public TickUnits() {
this.tickUnits = new ArrayList();
}
/**
* Adds a tick unit to the collection. The tick units are maintained in
* ascending order.
*
* @param unit the tick unit to add ({@code null} not permitted).
*/
public void add(TickUnit unit) {
if (unit == null) {
throw new NullPointerException("Null 'unit' argument.");
}
this.tickUnits.add(unit);
Collections.sort(this.tickUnits);
}
/**
* Returns the number of tick units in this collection.
*
* This method is required for the XML writer.
*
* @return The number of units in this collection.
*/
public int size() {
return this.tickUnits.size();
}
/**
* Returns the tickunit on the given position.
*
* This method is required for the XML writer.
*
* @param pos the position in the list.
*
* @return The tickunit.
*/
public TickUnit get(int pos) {
return (TickUnit) this.tickUnits.get(pos);
}
/**
* Returns a tick unit that is larger than the supplied unit.
*
* @param unit the unit.
*
* @return A tick unit that is larger than the supplied unit.
*/
@Override
public TickUnit getLargerTickUnit(TickUnit unit) {
int index = Collections.binarySearch(this.tickUnits, unit);
if (index >= 0) {
index = index + 1;
}
else {
index = -index;
}
return (TickUnit) this.tickUnits.get(Math.min(index,
this.tickUnits.size() - 1));
}
/**
* Returns the tick unit in the collection that is greater than or equal
* to (in size) the specified unit.
*
* @param unit the unit.
*
* @return A unit from the collection.
*/
@Override
public TickUnit getCeilingTickUnit(TickUnit unit) {
int index = Collections.binarySearch(this.tickUnits, unit);
if (index >= 0) {
return (TickUnit) this.tickUnits.get(index);
}
else {
index = -(index + 1);
return (TickUnit) this.tickUnits.get(Math.min(index,
this.tickUnits.size() - 1));
}
}
/**
* Returns the tick unit in the collection that is greater than or equal
* to the specified size.
*
* @param size the size.
*
* @return A unit from the collection.
*/
@Override
public TickUnit getCeilingTickUnit(double size) {
return getCeilingTickUnit(new NumberTickUnit(size,
NumberFormat.getInstance()));
}
/**
* Returns a clone of the collection.
*
* @return A clone.
*
* @throws CloneNotSupportedException if an item in the collection does not
* support cloning.
*/
@Override
public Object clone() throws CloneNotSupportedException {
TickUnits clone = (TickUnits) super.clone();
clone.tickUnits = new java.util.ArrayList(this.tickUnits);
return clone;
}
/**
* Tests an object for equality with this instance.
*
* @param obj the object to test ({@code null} permitted).
*
* @return A boolean.
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof TickUnits)) {
return false;
}
TickUnits that = (TickUnits) obj;
return that.tickUnits.equals(this.tickUnits);
}
}