org.jfree.data.ComparableObjectItem Maven / Gradle / Ivy
Show all versions of jfreechart Show documentation
/* ===========================================================
* 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.]
*
* -------------------------
* ComparableObjectItem.java
* -------------------------
* (C) Copyright 2006-present, by David Gilbert.
*
* Original Author: David Gilbert;
* Contributor(s): -;
*
*/
package org.jfree.data;
import java.io.Serializable;
import java.util.Objects;
import org.jfree.chart.util.Args;
/**
* Represents one (Comparable, Object) data item for use in a
* {@link ComparableObjectSeries}.
*/
public class ComparableObjectItem implements Cloneable, Comparable,
Serializable {
/** For serialization. */
private static final long serialVersionUID = 2751513470325494890L;
/** The x-value. */
private Comparable x;
/** The y-value. */
private Object obj;
/**
* Constructs a new data item.
*
* @param x the x-value ({@code null} NOT permitted).
* @param y the y-value ({@code null} permitted).
*/
public ComparableObjectItem(Comparable x, Object y) {
Args.nullNotPermitted(x, "x");
this.x = x;
this.obj = y;
}
/**
* Returns the x-value.
*
* @return The x-value (never {@code null}).
*/
protected Comparable getComparable() {
return this.x;
}
/**
* Returns the y-value.
*
* @return The y-value (possibly {@code null}).
*/
protected Object getObject() {
return this.obj;
}
/**
* Sets the y-value for this data item. Note that there is no
* corresponding method to change the x-value.
*
* @param y the new y-value ({@code null} permitted).
*/
protected void setObject(Object y) {
this.obj = y;
}
/**
* Returns an integer indicating the order of this object relative to
* another object.
*
* For the order we consider only the x-value:
* negative == "less-than", zero == "equal", positive == "greater-than".
*
* @param o1 the object being compared to.
*
* @return An integer indicating the order of this data pair object
* relative to another object.
*/
@Override
public int compareTo(Object o1) {
int result;
// CASE 1 : Comparing to another ComparableObjectItem object
// ---------------------------------------------------------
if (o1 instanceof ComparableObjectItem) {
ComparableObjectItem that = (ComparableObjectItem) o1;
return this.x.compareTo(that.x);
}
// CASE 2 : Comparing to a general object
// ---------------------------------------------
else {
// consider these to be ordered after general objects
result = 1;
}
return result;
}
/**
* Returns a clone of this object.
*
* @return A clone.
*
* @throws CloneNotSupportedException not thrown by this class, but
* subclasses may differ.
*/
@Override
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
/**
* Tests if this object is equal to another.
*
* @param obj the object to test against for equality ({@code null}
* permitted).
*
* @return A boolean.
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof ComparableObjectItem)) {
return false;
}
ComparableObjectItem that = (ComparableObjectItem) obj;
if (!this.x.equals(that.x)) {
return false;
}
if (!Objects.equals(this.obj, that.obj)) {
return false;
}
return true;
}
/**
* Returns a hash code.
*
* @return A hash code.
*/
@Override
public int hashCode() {
int result;
result = this.x.hashCode();
result = 29 * result + (this.obj != null ? this.obj.hashCode() : 0);
return result;
}
}