org.jfree.chart.StrokeMap Maven / Gradle / Ivy
/* ===========================================================
* 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.]
*
* --------------
* StrokeMap.java
* --------------
* (C) Copyright 2006-present, by David Gilbert.
*
* Original Author: David Gilbert;
* Contributor(s): -;
*
*/
package org.jfree.chart;
import java.awt.Stroke;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Iterator;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.TreeMap;
import org.jfree.chart.util.Args;
import org.jfree.chart.util.SerialUtils;
/**
* A storage structure that maps {@code Comparable} instances with
* {@code Stroke} instances.
*
* To support cloning and serialization, you should only use keys that are
* cloneable and serializable. Special handling for the {@code Stroke}
* instances is included in this class.
*/
public class StrokeMap implements Cloneable, Serializable {
/** For serialization. */
static final long serialVersionUID = -8148916785963525169L;
/** Storage for the keys and values. */
private transient Map store;
/**
* Creates a new (empty) map.
*/
public StrokeMap() {
this.store = new TreeMap();
}
/**
* Returns the stroke associated with the specified key, or
* {@code null}.
*
* @param key the key ({@code null} not permitted).
*
* @return The stroke, or {@code null}.
*
* @throws IllegalArgumentException if {@code key} is
* {@code null}.
*/
public Stroke getStroke(Comparable key) {
Args.nullNotPermitted(key, "key");
return (Stroke) this.store.get(key);
}
/**
* Returns {@code true} if the map contains the specified key, and
* {@code false} otherwise.
*
* @param key the key.
*
* @return {@code true} if the map contains the specified key, and
* {@code false} otherwise.
*/
public boolean containsKey(Comparable key) {
return this.store.containsKey(key);
}
/**
* Adds a mapping between the specified {@code key} and
* {@code stroke} values.
*
* @param key the key ({@code null} not permitted).
* @param stroke the stroke.
*/
public void put(Comparable key, Stroke stroke) {
Args.nullNotPermitted(key, "key");
this.store.put(key, stroke);
}
/**
* Resets the map to empty.
*/
public void clear() {
this.store.clear();
}
/**
* Tests this map for equality with an arbitrary object.
*
* @param obj the object ({@code null} permitted).
*
* @return A boolean.
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof StrokeMap)) {
return false;
}
StrokeMap that = (StrokeMap) obj;
if (this.store.size() != that.store.size()) {
return false;
}
Set keys = this.store.keySet();
Iterator iterator = keys.iterator();
while (iterator.hasNext()) {
Comparable key = (Comparable) iterator.next();
Stroke s1 = getStroke(key);
Stroke s2 = that.getStroke(key);
if (!Objects.equals(s1, s2)) {
return false;
}
}
return true;
}
/**
* Returns a clone of this {@code StrokeMap}.
*
* @return A clone of this instance.
*
* @throws CloneNotSupportedException if any key is not cloneable.
*/
@Override
public Object clone() throws CloneNotSupportedException {
StrokeMap clone = (StrokeMap) super.clone();
clone.store = new TreeMap();
clone.store.putAll(this.store);
// TODO: I think we need to make sure the keys are actually cloned,
// whereas the stroke instances are always immutable so they're OK
return 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();
stream.writeInt(this.store.size());
Set keys = this.store.keySet();
Iterator iterator = keys.iterator();
while (iterator.hasNext()) {
Comparable key = (Comparable) iterator.next();
stream.writeObject(key);
Stroke stroke = getStroke(key);
SerialUtils.writeStroke(stroke, 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();
this.store = new TreeMap();
int keyCount = stream.readInt();
for (int i = 0; i < keyCount; i++) {
Comparable key = (Comparable) stream.readObject();
Stroke stroke = SerialUtils.readStroke(stream);
this.store.put(key, stroke);
}
}
}