    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     * StandardEntityCollection.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-May-2002 : Version 1 (DG);
    038     * 26-Jun-2002 : Added iterator() method (DG);
    039     * 03-Oct-2002 : Fixed errors reported by Checkstyle (DG);
    040     * 19-May-2004 : Implemented Serializable (DG);
    041     * 29-Sep-2004 : Renamed addEntity() --> add() and addEntities()
    042     *               --> addAll() (DG);
    043     * 19-Jan-2005 : Changed storage from Collection --> List (DG);
    044     * 20-May-2005 : Fixed bug 1113521 - inefficiency in getEntity() method (DG);
    045     * ------------- JFREECHART 1.0.x ---------------------------------------------
    046     * 01-Dec-2006 : Implemented PublicCloneable and fixed clone() method (DG);
    047     *
    048     */
    049
    050    package org.jfree.chart.entity;
    051
    052    import java.io.Serializable;
    053    import java.util.Collection;
    054    import java.util.Collections;
    055    import java.util.Iterator;
    056    import java.util.List;
    057
    058    import org.jfree.util.ObjectUtilities;
    059    import org.jfree.util.PublicCloneable;
    060
    061    /**
    062     * A standard implementation of the {@link EntityCollection} interface.
    063     */
    064    public class StandardEntityCollection implements EntityCollection,
    065            Cloneable, PublicCloneable, Serializable {
    066
    067        /** For serialization. */
    068        private static final long serialVersionUID = 5384773031184897047L;
    069
    070        /** Storage for the entities. */
    071        private List entities;
    072
    073        /**
    074         * Constructs a new entity collection (initially empty).
    075         */
    076        public StandardEntityCollection() {
    077            this.entities = new java.util.ArrayList();
    078        }
    079
    080        /**
    081         * Returns the number of entities in the collection.
    082         *
    083         * @return The entity count.
    084         */
    085        public int getEntityCount() {
    086            return this.entities.size();
    087        }
    088
    089        /**
    090         * Returns a chart entity from the collection.
    091         *
    092         * @param index  the entity index.
    093         *
    094         * @return The entity.
    095         *
    096         * @see #add(ChartEntity)
    097         */
    098        public ChartEntity getEntity(int index) {
    099            return (ChartEntity) this.entities.get(index);
    100        }
    101
    102        /**
    103         * Clears all the entities from the collection.
    104         */
    105        public void clear() {
    106            this.entities.clear();
    107        }
    108
    109        /**
    110         * Adds an entity to the collection.
    111         *
    112         * @param entity  the entity (<code>null</code> not permitted).
    113         */
    114        public void add(ChartEntity entity) {
    115            if (entity == null) {
    116                throw new IllegalArgumentException("Null 'entity' argument.");
    117            }
    118            this.entities.add(entity);
    119        }
    120
    121        /**
    122         * Adds all the entities from the specified collection.
    123         *
    124         * @param collection  the collection of entities (<code>null</code> not
    125         *     permitted).
    126         */
    127        public void addAll(EntityCollection collection) {
    128            this.entities.addAll(collection.getEntities());
    129        }
    130
    131        /**
    132         * Returns the last entity in the list with an area that encloses the
    133         * specified coordinates, or <code>null</code> if there is no such entity.
    134         *
    135         * @param x  the x coordinate.
    136         * @param y  the y coordinate.
    137         *
    138         * @return The entity (possibly <code>null</code>).
    139         */
    140        public ChartEntity getEntity(double x, double y) {
    141            int entityCount = this.entities.size();
    142            for (int i = entityCount - 1; i >= 0; i--) {
    143                ChartEntity entity = (ChartEntity) this.entities.get(i);
    144                if (entity.getArea().contains(x, y)) {
    145                    return entity;
    146                }
    147            }
    148            return null;
    149        }
    150
    151        /**
    152         * Returns the entities in an unmodifiable collection.
    153         *
    154         * @return The entities.
    155         */
    156        public Collection getEntities() {
    157            return Collections.unmodifiableCollection(this.entities);
    158        }
    159
    160        /**
    161         * Returns an iterator for the entities in the collection.
    162         *
    163         * @return An iterator.
    164         */
    165        public Iterator iterator() {
    166            return this.entities.iterator();
    167        }
    168
    169        /**
    170         * Tests this object for equality with an arbitrary object.
    171         *
    172         * @param obj  the object to test against (<code>null</code> permitted).
    173         *
    174         * @return A boolean.
    175         */
    176        public boolean equals(Object obj) {
    177            if (obj == this) {
    178                return true;
    179            }
    180            if (obj instanceof StandardEntityCollection) {
    181                StandardEntityCollection that = (StandardEntityCollection) obj;
    182                return ObjectUtilities.equal(this.entities, that.entities);
    183            }
    184            return false;
    185        }
    186
    187        /**
    188         * Returns a clone of this entity collection.
    189         *
    190         * @return A clone.
    191         *
    192         * @throws CloneNotSupportedException if the object cannot be cloned.
    193         */
    194        public Object clone() throws CloneNotSupportedException {
    195            StandardEntityCollection clone
    196                    = (StandardEntityCollection) super.clone();
    197            clone.entities = new java.util.ArrayList(this.entities.size());
    198            for (int i = 0; i < this.entities.size(); i++) {
    199                ChartEntity entity = (ChartEntity) this.entities.get(i);
    200                clone.entities.add(entity.clone());
    201            }
    202            return clone;
    203        }
    204
    205    }