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/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-present, by David Gilbert 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.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* ---------------
* PlotEntity.java
* ---------------
* (C) Copyright 2009-present, by David Gilbert and Contributors.
*
* Original Author: Peter Kolb;
* Contributor(s): Tracy Hiltbrand (equals/hashCode comply with EqualsVerifier);
*
*/
package org.jfree.chart.entity;
import java.awt.Shape;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import org.jfree.chart.plot.Plot;
import org.jfree.chart.HashUtils;
import org.jfree.chart.util.Args;
import org.jfree.chart.util.SerialUtils;
/**
* A class that captures information about a plot.
*/
public class PlotEntity extends ChartEntity {
/** For serialization. */
private static final long serialVersionUID = -4445994133561919083L;
//same as for ChartEntity!
/** The plot. */
private Plot plot;
/**
* Creates a new plot entity.
*
* @param area the area ({@code null} not permitted).
* @param plot the plot ({@code null} not permitted).
*/
public PlotEntity(Shape area, Plot plot) {
// defer argument checks...
this(area, plot, null);
}
/**
* Creates a new plot entity.
*
* @param area the area ({@code null} not permitted).
* @param plot the plot ({@code null} not permitted).
* @param toolTipText the tool tip text ({@code null} permitted).
*/
public PlotEntity(Shape area, Plot plot, String toolTipText) {
// defer argument checks...
this(area, plot, toolTipText, null);
}
/**
* Creates a new plot entity.
*
* @param area the area ({@code null} not permitted).
* @param plot the plot ({@code null} not permitted).
* @param toolTipText the tool tip text ({@code null} permitted).
* @param urlText the URL text for HTML image maps ({@code null}
* permitted).
*/
public PlotEntity(Shape area, Plot plot, String toolTipText,
String urlText) {
super(area, toolTipText, urlText);
Args.nullNotPermitted(plot, "plot");
this.plot = plot;
}
/**
* Returns the plot that occupies the entity area.
*
* @return The plot (never {@code null}).
*/
public Plot getPlot() {
return this.plot;
}
/**
* Returns a string representation of the plot entity, useful for
* debugging.
*
* @return A string.
*/
@Override
public String toString() {
StringBuilder sb = new StringBuilder("PlotEntity: ");
sb.append("tooltip = ");
sb.append(getToolTipText());
return sb.toString();
}
/**
* Tests the entity for equality with an arbitrary object.
*
* @param obj the object to test against ({@code null} permitted).
*
* @return A boolean.
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof PlotEntity)) {
return false;
}
PlotEntity that = (PlotEntity) obj;
// fix the "equals not symmetric" problem
if (!that.canEqual(this)) {
return false;
}
if (!(this.plot.equals(that.plot))) {
return false;
}
return super.equals(obj);
}
/**
* Ensures symmetry between super/subclass implementations of equals. For
* more detail, see http://jqno.nl/equalsverifier/manual/inheritance.
*
* @param other Object
*
* @return true ONLY if the parameter is THIS class type
*/
@Override
public boolean canEqual(Object other) {
// Solves Problem: equals not symmetric
return (other instanceof PlotEntity);
}
/**
* Returns a hash code for this instance.
*
* @return A hash code.
*/
@Override
public int hashCode() {
int result = super.hashCode(); // equals calls superclass function, so hashCode must also
result = HashUtils.hashCode(result, getToolTipText());
result = HashUtils.hashCode(result, getURLText());
return result;
}
/**
* Returns a clone of the entity.
*
* @return A clone.
*
* @throws CloneNotSupportedException if there is a problem cloning the
* entity.
*/
@Override
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
/**
* Provides serialization support.
*
* @param stream the output stream.
*
* @throws IOException if there is an I/O error.
*/
private void writeObject(ObjectOutputStream stream) throws IOException {
stream.defaultWriteObject();
SerialUtils.writeShape(getArea(), stream);
}
/**
* Provides serialization support.
*
* @param stream the input stream.
*
* @throws IOException if there is an I/O error.
* @throws ClassNotFoundException if there is a classpath problem.
*/
private void readObject(ObjectInputStream stream)
throws IOException, ClassNotFoundException {
stream.defaultReadObject();
setArea(SerialUtils.readShape(stream));
}
}