    001    /* ===========================================================
    002     * JFreeChart : a free chart library for the Java(tm) platform
    003     * ===========================================================
    004     *
    005     * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
    006     *
    007     * Project Info:  http://www.jfree.org/jfreechart/index.html
    008     *
    009     * This library is free software; you can redistribute it and/or modify it
    010     * under the terms of the GNU Lesser General Public License as published by
    011     * the Free Software Foundation; either version 2.1 of the License, or
    012     * (at your option) any later version.
    013     *
    014     * This library is distributed in the hope that it will be useful, but
    015     * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    016     * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
    017     * License for more details.
    018     *
    019     * You should have received a copy of the GNU Lesser General Public
    020     * License along with this library; if not, write to the Free Software
    021     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
    022     * USA.
    023     *
    024     * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
    025     * in the United States and other countries.]
    026     *
    027     * --------------
    028     * TickUnits.java
    029     * --------------
    030     * (C) Copyright 2001-2007, by Object Refinery Limited.
    031     *
    032     * Original Author:  David Gilbert (for Object Refinery Limited);
    033     * Contributor(s):   -;
    034     *
    035     * Changes
    036     * -------
    037     * 23-Nov-2001 : Version 1 (DG);
    038     * 18-Feb-2002 : Fixed bug in getNearestTickUnit (thanks to Mario Inchiosa for
    039     *               reporting this, SourceForge bug id 518073) (DG);
    040     * 25-Feb-2002 : Moved createStandardTickUnits() method from NumberAxis, and
    041     *               added createIntegerTickUnits() method (DG);
    042     * 01-May-2002 : Updated for changes to the TickUnit class (DG);
    043     * 18-Sep-2002 : Added standardTickUnit methods which take a Locale
    044     *               instance (AS);
    045     * 26-Sep-2002 : Fixed errors reported by Checkstyle (DG);
    046     * 08-Nov-2002 : Moved to new package com.jrefinery.chart.axis (DG);
    047     * 26-Mar-2003 : Implemented Serializable (DG);
    048     * 13-Aug-2003 : Implemented Cloneable (DG);
    049     * 23-Sep-2003 : Implemented TickUnitSource interface (DG);
    050     * 03-Dec-2003 : Adding null values now throws exceptions (TM);
    051     * 11-Jan-2005 : Removed deprecated methods in preparation for 1.0.0
    052     *               release (DG);
    053     *
    054     */
    055
    056    package org.jfree.chart.axis;
    057
    058    import java.io.Serializable;
    059    import java.text.NumberFormat;
    060    import java.util.ArrayList;
    061    import java.util.Collections;
    062    import java.util.List;
    063
    064    /**
    065     * A collection of tick units, used by the {@link DateAxis} and
    066     * {@link NumberAxis} classes.
    067     */
    068    public class TickUnits implements TickUnitSource, Cloneable, Serializable {
    069
    070        /** For serialization. */
    071        private static final long serialVersionUID = 1134174035901467545L;
    072
    073        /** Storage for the tick units. */
    074        private List tickUnits;
    075
    076        /**
    077         * Constructs a new collection of tick units.
    078         */
    079        public TickUnits() {
    080            this.tickUnits = new ArrayList();
    081        }
    082
    083        /**
    084         * Adds a tick unit to the collection.  The tick units are maintained in
    085         * ascending order.
    086         *
    087         * @param unit  the tick unit to add (<code>null</code> not permitted).
    088         */
    089        public void add(TickUnit unit) {
    090            if (unit == null) {
    091                throw new NullPointerException("Null 'unit' argument.");
    092            }
    093            this.tickUnits.add(unit);
    094            Collections.sort(this.tickUnits);
    095        }
    096
    097        /**
    098         * Returns the number of tick units in this collection.
    099         * <P>
    100         * This method is required for the XML writer.
    101         *
    102         * @return The number of units in this collection.
    103         */
    104        public int size() {
    105            return this.tickUnits.size();
    106        }
    107
    108        /**
    109         * Returns the tickunit on the given position.
    110         * <P>
    111         * This method is required for the XML writer.
    112         *
    113         * @param pos the position in the list.
    114         *
    115         * @return The tickunit.
    116         */
    117        public TickUnit get(int pos) {
    118            return (TickUnit) this.tickUnits.get(pos);
    119        }
    120
    121        /**
    122         * Returns a tick unit that is larger than the supplied unit.
    123         *
    124         * @param unit   the unit.
    125         *
    126         * @return A tick unit that is larger than the supplied unit.
    127         */
    128        public TickUnit getLargerTickUnit(TickUnit unit) {
    129
    130            int index = Collections.binarySearch(this.tickUnits, unit);
    131            if (index >= 0) {
    132                index = index + 1;
    133            }
    134            else {
    135                index = -index;
    136            }
    137
    138            return (TickUnit) this.tickUnits.get(Math.min(index,
    139                    this.tickUnits.size() - 1));
    140
    141        }
    142
    143        /**
    144         * Returns the tick unit in the collection that is greater than or equal
    145         * to (in size) the specified unit.
    146         *
    147         * @param unit  the unit.
    148         *
    149         * @return A unit from the collection.
    150         */
    151        public TickUnit getCeilingTickUnit(TickUnit unit) {
    152
    153            int index = Collections.binarySearch(this.tickUnits, unit);
    154            if (index >= 0) {
    155                return (TickUnit) this.tickUnits.get(index);
    156            }
    157            else {
    158                index = -(index + 1);
    159                return (TickUnit) this.tickUnits.get(Math.min(index,
    160                        this.tickUnits.size() - 1));
    161            }
    162
    163        }
    164
    165        /**
    166         * Returns the tick unit in the collection that is greater than or equal
    167         * to the specified size.
    168         *
    169         * @param size  the size.
    170         *
    171         * @return A unit from the collection.
    172         */
    173        public TickUnit getCeilingTickUnit(double size) {
    174            return getCeilingTickUnit(new NumberTickUnit(size,
    175                    NumberFormat.getInstance()));
    176        }
    177
    178        /**
    179         * Returns a clone of the collection.
    180         *
    181         * @return A clone.
    182         *
    183         * @throws CloneNotSupportedException if an item in the collection does not
    184         *         support cloning.
    185         */
    186        public Object clone() throws CloneNotSupportedException {
    187            TickUnits clone = (TickUnits) super.clone();
    188            clone.tickUnits = new java.util.ArrayList(this.tickUnits);
    189            return clone;
    190        }
    191
    192        /**
    193         * Tests an object for equality with this instance.
    194         *
    195         * @param obj  the object to test (<code>null</code> permitted).
    196         *
    197         * @return A boolean.
    198         */
    199        public boolean equals(Object obj) {
    200            if (obj == this) {
    201                return true;
    202            }
    203            if (!(obj instanceof TickUnits)) {
    204                return false;
    205            }
    206            TickUnits that = (TickUnits) obj;
    207            return that.tickUnits.equals(this.tickUnits);
    208        }
    209
    210    }