    001    /* ===========================================================
    002     * JFreeChart : a free chart library for the Java(tm) platform
    003     * ===========================================================
    004     *
    005     * (C) Copyright 2000-2009, 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     * JFreeChartEntity.java
    029     * --------------------
    030     * (C) Copyright 2009, by Object Refinery Limited and Contributors.
    031     *
    032     * Original Author:  Peter Kolb;
    033     * Contributor(s):   ;
    034     *
    035     * Changes:
    036     * --------
    037     * 15-Feb-2009 : Version 1 (PK);
    038     *
    039     */
    040
    041    package org.jfree.chart.entity;
    042
    043    import java.awt.Shape;
    044    import java.io.IOException;
    045    import java.io.ObjectInputStream;
    046    import java.io.ObjectOutputStream;
    047
    048    import org.jfree.chart.JFreeChart;
    049    import org.jfree.chart.HashUtilities;
    050    import org.jfree.io.SerialUtilities;
    051    import org.jfree.util.ObjectUtilities;
    052
    053    /**
    054     * A class that captures information about an entire chart.
    055     *
    056     * @since 1.0.13
    057     */
    058    public class JFreeChartEntity extends ChartEntity {
    059
    060        /** For serialization. */
    061        private static final long serialVersionUID = -4445994133561919083L;
    062                //same as for ChartEntity!
    063
    064        /** The chart. */
    065        private JFreeChart chart;
    066
    067        /**
    068         * Creates a new chart entity.
    069         *
    070         * @param area  the area (<code>null</code> not permitted).
    071         * @param chart  the chart (<code>null</code> not permitted).
    072         */
    073        public JFreeChartEntity(Shape area, JFreeChart chart) {
    074            // defer argument checks...
    075            this(area, chart, null);
    076        }
    077
    078        /**
    079         * Creates a new chart entity.
    080         *
    081         * @param area  the area (<code>null</code> not permitted).
    082         * @param chart  the chart (<code>null</code> not permitted).
    083         * @param toolTipText  the tool tip text (<code>null</code> permitted).
    084         */
    085        public JFreeChartEntity(Shape area, JFreeChart chart, String toolTipText) {
    086            // defer argument checks...
    087            this(area, chart, toolTipText, null);
    088        }
    089
    090        /**
    091         * Creates a new chart entity.
    092         *
    093         * @param area  the area (<code>null</code> not permitted).
    094         * @param chart  the chart (<code>null</code> not permitted).
    095         * @param toolTipText  the tool tip text (<code>null</code> permitted).
    096         * @param urlText  the URL text for HTML image maps (<code>null</code>
    097         *                 permitted).
    098         */
    099        public JFreeChartEntity(Shape area, JFreeChart chart, String toolTipText,
    100                String urlText) {
    101            super(area, toolTipText, urlText);
    102            if (chart == null) {
    103                throw new IllegalArgumentException("Null 'chart' argument.");
    104            }
    105
    106            this.chart = chart;
    107        }
    108
    109        /**
    110         * Returns the chart that occupies the entity area.
    111         *
    112         * @return The chart (never <code>null</code>).
    113         */
    114        public JFreeChart getChart() {
    115            return this.chart;
    116        }
    117
    118        /**
    119         * Returns a string representation of the chart entity, useful for
    120         * debugging.
    121         *
    122         * @return A string.
    123         */
    124        public String toString() {
    125            StringBuffer buf = new StringBuffer("JFreeChartEntity: ");
    126            buf.append("tooltip = ");
    127            buf.append(getToolTipText());
    128            return buf.toString();
    129        }
    130
    131        /**
    132         * Tests the entity for equality with an arbitrary object.
    133         *
    134         * @param obj  the object to test against (<code>null</code> permitted).
    135         *
    136         * @return A boolean.
    137         */
    138        public boolean equals(Object obj) {
    139            if (obj == this) {
    140                return true;
    141            }
    142            if (!(obj instanceof JFreeChartEntity)) {
    143                return false;
    144            }
    145            JFreeChartEntity that = (JFreeChartEntity) obj;
    146            if (!getArea().equals(that.getArea())) {
    147                return false;
    148            }
    149            if (!ObjectUtilities.equal(getToolTipText(), that.getToolTipText())) {
    150                return false;
    151            }
    152            if (!ObjectUtilities.equal(getURLText(), that.getURLText())) {
    153                return false;
    154            }
    155            if (!(this.chart.equals(that.chart))) {
    156                return false;
    157            }
    158            return true;
    159        }
    160
    161        /**
    162         * Returns a hash code for this instance.
    163         *
    164         * @return A hash code.
    165         */
    166        public int hashCode() {
    167            int result = 39;
    168            result = HashUtilities.hashCode(result, getToolTipText());
    169            result = HashUtilities.hashCode(result, getURLText());
    170            return result;
    171        }
    172
    173        /**
    174         * Returns a clone of the entity.
    175         *
    176         * @return A clone.
    177         *
    178         * @throws CloneNotSupportedException if there is a problem cloning the
    179         *         entity.
    180         */
    181        public Object clone() throws CloneNotSupportedException {
    182            return super.clone();
    183        }
    184
    185        /**
    186         * Provides serialization support.
    187         *
    188         * @param stream  the output stream.
    189         *
    190         * @throws IOException  if there is an I/O error.
    191         */
    192        private void writeObject(ObjectOutputStream stream) throws IOException {
    193            stream.defaultWriteObject();
    194            SerialUtilities.writeShape(getArea(), stream);
    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            setArea(SerialUtilities.readShape(stream));
    209        }
    210
    211    }