/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2011, by Object Refinery Limited 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.]
*
* ---------------
* XYDataItem.java
* ---------------
* (C) Copyright 2003-2009, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes
* -------
* 05-Aug-2003 : Renamed XYDataPair --> XYDataItem (DG);
* 03-Feb-2004 : Fixed bug in equals() method (DG);
* 21-Feb-2005 : Added setY(double) method (DG);
* ------------- JFREECHART 1.0.x ---------------------------------------------
* 30-Nov-2007 : Implemented getXValue() and getYValue(), plus toString() for
* debugging use (DG);
* 10-Jun-2009 : Reimplemented cloning (DG);
*
*/
package org.jfree.data.xy;
import java.io.Serializable;
import org.jfree.util.ObjectUtilities;
/**
* Represents one (x, y) data item for an {@link XYSeries}. Note that
* subclasses are REQUIRED to support cloning.
*/
public class XYDataItem implements Cloneable, Comparable, Serializable {
/** For serialization. */
private static final long serialVersionUID = 2751513470325494890L;
/** The x-value (<code>null</code> not permitted). */
private Number x;
/** The y-value. */
private Number y;
/**
* Constructs a new data item.
*
* @param x the x-value (<code>null</code> NOT permitted).
* @param y the y-value (<code>null</code> permitted).
*/
public XYDataItem(Number x, Number y) {
if (x == null) {
throw new IllegalArgumentException("Null 'x' argument.");
}
this.x = x;
this.y = y;
}
/**
* Constructs a new data item.
*
* @param x the x-value.
* @param y the y-value.
*/
public XYDataItem(double x, double y) {
this(new Double(x), new Double(y));
}
/**
* Returns the x-value.
*
* @return The x-value (never <code>null</code>).
*/
public Number getX() {
return this.x;
}
/**
* Returns the x-value as a double primitive.
*
* @return The x-value.
*
* @see #getX()
* @see #getYValue()
*
* @since 1.0.9
*/
public double getXValue() {
// this.x is not allowed to be null...
return this.x.doubleValue();
}
/**
* Returns the y-value.
*
* @return The y-value (possibly <code>null</code>).
*/
public Number getY() {
return this.y;
}
/**
* Returns the y-value as a double primitive.
*
* @return The y-value.
*
* @see #getY()
* @see #getXValue()
*
* @since 1.0.9
*/
public double getYValue() {
double result = Double.NaN;
if (this.y != null) {
result = this.y.doubleValue();
}
return result;
}
/**
* 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.
*/
public void setY(double y) {
setY(new Double(y));
}
/**
* 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</code> permitted).
*/
public void setY(Number y) {
this.y = y;
}
/**
* Returns an integer indicating the order of this object relative to
* another object.
* <P>
* 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.
*/
public int compareTo(Object o1) {
int result;
// CASE 1 : Comparing to another TimeSeriesDataPair object
// -------------------------------------------------------
if (o1 instanceof XYDataItem) {
XYDataItem dataItem = (XYDataItem) o1;
double compare = this.x.doubleValue()
- dataItem.getX().doubleValue();
if (compare > 0.0) {
result = 1;
}
else {
if (compare < 0.0) {
result = -1;
}
else {
result = 0;
}
}
}
// CASE 2 : Comparing to a general object
// ---------------------------------------------
else {
// consider time periods to be ordered after general objects
result = 1;
}
return result;
}
/**
* Returns a clone of this object.
*
* @return A clone.
*/
public Object clone() {
Object clone = null;
try {
clone = super.clone();
}
catch (CloneNotSupportedException e) { // won't get here...
e.printStackTrace();
}
return clone;
}
/**
* Tests if this object is equal to another.
*
* @param obj the object to test against for equality (<code>null</code>
* permitted).
*
* @return A boolean.
*/
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof XYDataItem)) {
return false;
}
XYDataItem that = (XYDataItem) obj;
if (!this.x.equals(that.x)) {
return false;
}
if (!ObjectUtilities.equal(this.y, that.y)) {
return false;
}
return true;
}
/**
* Returns a hash code.
*
* @return A hash code.
*/
public int hashCode() {
int result;
result = this.x.hashCode();
result = 29 * result + (this.y != null ? this.y.hashCode() : 0);
return result;
}
/**
* Returns a string representing this instance, primarily for debugging
* use.
*
* @return A string.
*/
public String toString() {
return "[" + getXValue() + ", " + getYValue() + "]";
}
}