jfreechart example source code file (TickUnits.java)

This example jfreechart source code file (TickUnits.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

arraylist, clonenotsupportedexception, clonenotsupportedexception, io, list, nullpointerexception, numbertickunit, object, object, serializable, text, tickunit, tickunit, tickunits, tickunits, tickunitsource, util

The jfreechart TickUnits.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.]
 *
 * --------------
 * TickUnits.java
 * --------------
 * (C) Copyright 2001-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 23-Nov-2001 : Version 1 (DG);
 * 18-Feb-2002 : Fixed bug in getNearestTickUnit (thanks to Mario Inchiosa for
 *               reporting this, SourceForge bug id 518073) (DG);
 * 25-Feb-2002 : Moved createStandardTickUnits() method from NumberAxis, and
 *               added createIntegerTickUnits() method (DG);
 * 01-May-2002 : Updated for changes to the TickUnit class (DG);
 * 18-Sep-2002 : Added standardTickUnit methods which take a Locale
 *               instance (AS);
 * 26-Sep-2002 : Fixed errors reported by Checkstyle (DG);
 * 08-Nov-2002 : Moved to new package com.jrefinery.chart.axis (DG);
 * 26-Mar-2003 : Implemented Serializable (DG);
 * 13-Aug-2003 : Implemented Cloneable (DG);
 * 23-Sep-2003 : Implemented TickUnitSource interface (DG);
 * 03-Dec-2003 : Adding null values now throws exceptions (TM);
 * 11-Jan-2005 : Removed deprecated methods in preparation for 1.0.0
 *               release (DG);
 *
 */

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.
     * <P>
     * 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.
     * <P>
     * 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.
     */
    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.
     */
    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.
     */
    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.
     */
    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.
     */
    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);
    }

}