    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     * StrokeMap.java
    029     * --------------
    030     * (C) Copyright 2006, 2007, by Object Refinery Limited.
    031     *
    032     * Original Author:  David Gilbert (for Object Refinery Limited);
    033     * Contributor(s):   -;
    034     *
    035     * Changes:
    036     * --------
    037     * 27-Sep-2006 : Version 1 (DG);
    038     *
    039     */
    040
    041    package org.jfree.chart;
    042
    043    import java.awt.Stroke;
    044    import java.io.IOException;
    045    import java.io.ObjectInputStream;
    046    import java.io.ObjectOutputStream;
    047    import java.io.Serializable;
    048    import java.util.Iterator;
    049    import java.util.Map;
    050    import java.util.Set;
    051    import java.util.TreeMap;
    052
    053    import org.jfree.io.SerialUtilities;
    054    import org.jfree.util.ObjectUtilities;
    055
    056    /**
    057     * A storage structure that maps <code>Comparable</code> instances with
    058     * <code>Stroke</code> instances.
    059     * <br><br>
    060     * To support cloning and serialization, you should only use keys that are
    061     * cloneable and serializable.  Special handling for the <code>Stroke</code>
    062     * instances is included in this class.
    063     *
    064     * @since 1.0.3
    065     */
    066    public class StrokeMap implements Cloneable, Serializable {
    067
    068        /** For serialization. */
    069        static final long serialVersionUID = -8148916785963525169L;
    070
    071        /** Storage for the keys and values. */
    072        private transient Map store;
    073
    074        /**
    075         * Creates a new (empty) map.
    076         */
    077        public StrokeMap() {
    078            this.store = new TreeMap();
    079        }
    080
    081        /**
    082         * Returns the stroke associated with the specified key, or
    083         * <code>null</code>.
    084         *
    085         * @param key  the key (<code>null</code> not permitted).
    086         *
    087         * @return The stroke, or <code>null</code>.
    088         *
    089         * @throws IllegalArgumentException if <code>key</code> is
    090         *     <code>null</code>.
    091         */
    092        public Stroke getStroke(Comparable key) {
    093            if (key == null) {
    094                throw new IllegalArgumentException("Null 'key' argument.");
    095            }
    096            return (Stroke) this.store.get(key);
    097        }
    098
    099        /**
    100         * Returns <code>true</code> if the map contains the specified key, and
    101         * <code>false</code> otherwise.
    102         *
    103         * @param key  the key.
    104         *
    105         * @return <code>true</code> if the map contains the specified key, and
    106         * <code>false</code> otherwise.
    107         */
    108        public boolean containsKey(Comparable key) {
    109            return this.store.containsKey(key);
    110        }
    111
    112        /**
    113         * Adds a mapping between the specified <code>key</code> and
    114         * <code>stroke</code> values.
    115         *
    116         * @param key  the key (<code>null</code> not permitted).
    117         * @param stroke  the stroke.
    118         */
    119        public void put(Comparable key, Stroke stroke) {
    120            if (key == null) {
    121                throw new IllegalArgumentException("Null 'key' argument.");
    122            }
    123            this.store.put(key, stroke);
    124        }
    125
    126        /**
    127         * Resets the map to empty.
    128         */
    129        public void clear() {
    130            this.store.clear();
    131        }
    132
    133        /**
    134         * Tests this map for equality with an arbitrary object.
    135         *
    136         * @param obj  the object (<code>null</code> permitted).
    137         *
    138         * @return A boolean.
    139         */
    140        public boolean equals(Object obj) {
    141            if (obj == this) {
    142                return true;
    143            }
    144            if (!(obj instanceof StrokeMap)) {
    145                return false;
    146            }
    147            StrokeMap that = (StrokeMap) obj;
    148            if (this.store.size() != that.store.size()) {
    149                return false;
    150            }
    151            Set keys = this.store.keySet();
    152            Iterator iterator = keys.iterator();
    153            while (iterator.hasNext()) {
    154                Comparable key = (Comparable) iterator.next();
    155                Stroke s1 = getStroke(key);
    156                Stroke s2 = that.getStroke(key);
    157                if (!ObjectUtilities.equal(s1, s2)) {
    158                    return false;
    159                }
    160            }
    161            return true;
    162        }
    163
    164        /**
    165         * Returns a clone of this <code>StrokeMap</code>.
    166         *
    167         * @return A clone of this instance.
    168         *
    169         * @throws CloneNotSupportedException if any key is not cloneable.
    170         */
    171        public Object clone() throws CloneNotSupportedException {
    172            // TODO: I think we need to make sure the keys are actually cloned,
    173            // whereas the stroke instances are always immutable so they're OK
    174            return super.clone();
    175        }
    176
    177        /**
    178         * Provides serialization support.
    179         *
    180         * @param stream  the output stream.
    181         *
    182         * @throws IOException  if there is an I/O error.
    183         */
    184        private void writeObject(ObjectOutputStream stream) throws IOException {
    185            stream.defaultWriteObject();
    186            stream.writeInt(this.store.size());
    187            Set keys = this.store.keySet();
    188            Iterator iterator = keys.iterator();
    189            while (iterator.hasNext()) {
    190                Comparable key = (Comparable) iterator.next();
    191                stream.writeObject(key);
    192                Stroke stroke = getStroke(key);
    193                SerialUtilities.writeStroke(stroke, stream);
    194            }
    195        }
    196
    197        /**
    198         * Provides serialization support.
    199         *
    200         * @param stream  the input stream.
    201         *
    202         * @throws IOException  if there is an I/O error.
    203         * @throws ClassNotFoundException  if there is a classpath problem.
    204         */
    205        private void readObject(ObjectInputStream stream)
    206                throws IOException, ClassNotFoundException {
    207            stream.defaultReadObject();
    208            this.store = new TreeMap();
    209            int keyCount = stream.readInt();
    210            for (int i = 0; i < keyCount; i++) {
    211                Comparable key = (Comparable) stream.readObject();
    212                Stroke stroke = SerialUtilities.readStroke(stream);
    213                this.store.put(key, stroke);
    214            }
    215        }
    216
    217    }