jfreechart example source code file (XYSeries.java)
The jfreechart XYSeries.java source code
/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2009, 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.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* -------------
* XYSeries.java
* -------------
* (C) Copyright 2001-2009, Object Refinery Limited and Contributors.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): Aaron Metzger;
* Jonathan Gabbai;
* Richard Atkinson;
* Michel Santos;
* Ted Schwartz (fix for bug 1955483);
*
* Changes
* -------
* 15-Nov-2001 : Version 1 (DG);
* 03-Apr-2002 : Added an add(double, double) method (DG);
* 29-Apr-2002 : Added a clear() method (ARM);
* 06-Jun-2002 : Updated Javadoc comments (DG);
* 29-Aug-2002 : Modified to give user control over whether or not duplicate
* x-values are allowed (DG);
* 07-Oct-2002 : Fixed errors reported by Checkstyle (DG);
* 11-Nov-2002 : Added maximum item count, code contributed by Jonathan
* Gabbai (DG);
* 26-Mar-2003 : Implemented Serializable (DG);
* 04-Aug-2003 : Added getItems() method (DG);
* 15-Aug-2003 : Changed 'data' from private to protected, added new add()
* methods with a 'notify' argument (DG);
* 22-Sep-2003 : Added getAllowDuplicateXValues() method (RA);
* 29-Jan-2004 : Added autoSort attribute, based on a contribution by
* Michel Santos - see patch 886740 (DG);
* 03-Feb-2004 : Added indexOf() method (DG);
* 16-Feb-2004 : Added remove() method (DG);
* 18-Aug-2004 : Moved from org.jfree.data --> org.jfree.data.xy (DG);
* 21-Feb-2005 : Added update(Number, Number) and addOrUpdate(Number, Number)
* methods (DG);
* 03-May-2005 : Added a new constructor, fixed the setMaximumItemCount()
* method to remove items (and notify listeners) if necessary,
* fixed the add() and addOrUpdate() methods to handle unsorted
* series (DG);
* ------------- JFreeChart 1.0.x ---------------------------------------------
* 11-Jan-2005 : Renamed update(int, Number) --> updateByIndex() (DG);
* 15-Jan-2007 : Added toArray() method (DG);
* 31-Oct-2007 : Implemented faster hashCode() (DG);
* 22-Nov-2007 : Reimplemented clone() (DG);
* 01-May-2008 : Fixed bug 1955483 in addOrUpdate() method, thanks to
* Ted Schwartz (DG);
* 24-Nov-2008 : Further fix for 1955483 (DG);
* 06-Mar-2009 : Added minX, maxX, minY and maxY fields (DG);
*
*/
package org.jfree.data.xy;
import java.io.Serializable;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.jfree.data.general.Series;
import org.jfree.data.general.SeriesChangeEvent;
import org.jfree.data.general.SeriesException;
import org.jfree.util.ObjectUtilities;
/**
* Represents a sequence of zero or more data items in the form (x, y). By
* default, items in the series will be sorted into ascending order by x-value,
* and duplicate x-values are permitted. Both the sorting and duplicate
* defaults can be changed in the constructor. Y-values can be
* <code>null to represent missing values.
*/
public class XYSeries extends Series implements Cloneable, Serializable {
/** For serialization. */
static final long serialVersionUID = -5908509288197150436L;
// In version 0.9.12, in response to several developer requests, I changed
// the 'data' attribute from 'private' to 'protected', so that others can
// make subclasses that work directly with the underlying data structure.
/** Storage for the data items in the series. */
protected List data;
/** The maximum number of items for the series. */
private int maximumItemCount = Integer.MAX_VALUE;
/**
* A flag that controls whether the items are automatically sorted
* (by x-value ascending).
*/
private boolean autoSort;
/** A flag that controls whether or not duplicate x-values are allowed. */
private boolean allowDuplicateXValues;
/** The lowest x-value in the series, excluding Double.NaN values. */
private double minX;
/** The highest x-value in the series, excluding Double.NaN values. */
private double maxX;
/** The lowest y-value in the series, excluding Double.NaN values. */
private double minY;
/** The highest y-value in the series, excluding Double.NaN values. */
private double maxY;
/**
* Creates a new empty series. By default, items added to the series will
* be sorted into ascending order by x-value, and duplicate x-values will
* be allowed (these defaults can be modified with another constructor.
*
* @param key the series key (<code>null not permitted).
*/
public XYSeries(Comparable key) {
this(key, true, true);
}
/**
* Constructs a new empty series, with the auto-sort flag set as requested,
* and duplicate values allowed.
*
* @param key the series key (<code>null not permitted).
* @param autoSort a flag that controls whether or not the items in the
* series are sorted.
*/
public XYSeries(Comparable key, boolean autoSort) {
this(key, autoSort, true);
}
/**
* Constructs a new xy-series that contains no data. You can specify
* whether or not duplicate x-values are allowed for the series.
*
* @param key the series key (<code>null not permitted).
* @param autoSort a flag that controls whether or not the items in the
* series are sorted.
* @param allowDuplicateXValues a flag that controls whether duplicate
* x-values are allowed.
*/
public XYSeries(Comparable key, boolean autoSort,
boolean allowDuplicateXValues) {
super(key);
this.data = new java.util.ArrayList();
this.autoSort = autoSort;
this.allowDuplicateXValues = allowDuplicateXValues;
this.minX = Double.NaN;
this.maxX = Double.NaN;
this.minY = Double.NaN;
this.maxY = Double.NaN;
}
/**
* Returns the smallest x-value in the series, ignoring any Double.NaN
* values. This method returns Double.NaN if there is no smallest x-value
* (for example, when the series is empty).
*
* @return The smallest x-value.
*
* @see #getMaxX()
*
* @since 1.0.13
*/
public double getMinX() {
return this.minX;
}
/**
* Returns the largest x-value in the series, ignoring any Double.NaN
* values. This method returns Double.NaN if there is no largest x-value
* (for example, when the series is empty).
*
* @return The largest x-value.
*
* @see #getMinX()
*
* @since 1.0.13
*/
public double getMaxX() {
return this.maxX;
}
/**
* Returns the smallest y-value in the series, ignoring any null and
* Double.NaN values. This method returns Double.NaN if there is no
* smallest y-value (for example, when the series is empty).
*
* @return The smallest y-value.
*
* @see #getMaxY()
*
* @since 1.0.13
*/
public double getMinY() {
return this.minY;
}
/**
* Returns the largest y-value in the series, ignoring any Double.NaN
* values. This method returns Double.NaN if there is no largest y-value
* (for example, when the series is empty).
*
* @return The largest y-value.
*
* @see #getMinY()
*
* @since 1.0.13
*/
public double getMaxY() {
return this.maxY;
}
/**
* Updates the cached values for the minimum and maximum data values.
*
* @param item the item added (<code>null not permitted).
*
* @since 1.0.13
*/
private void updateBoundsForAddedItem(XYDataItem item) {
double x = item.getXValue();
this.minX = minIgnoreNaN(this.minX, x);
this.maxX = maxIgnoreNaN(this.maxX, x);
if (item.getY() != null) {
double y = item.getYValue();
this.minY = minIgnoreNaN(this.minY, y);
this.maxY = maxIgnoreNaN(this.maxY, y);
}
}
/**
* Updates the cached values for the minimum and maximum data values on
* the basis that the specified item has just been removed.
*
* @param item the item added (<code>null not permitted).
*
* @since 1.0.13
*/
private void updateBoundsForRemovedItem(XYDataItem item) {
boolean itemContributesToXBounds = false;
boolean itemContributesToYBounds = false;
double x = item.getXValue();
if (!Double.isNaN(x)) {
if (x <= this.minX || x >= this.maxX) {
itemContributesToXBounds = true;
}
}
if (item.getY() != null) {
double y = item.getYValue();
if (!Double.isNaN(y)) {
if (y <= this.minY || y >= this.maxY) {
itemContributesToYBounds = true;
}
}
}
if (itemContributesToYBounds) {
findBoundsByIteration();
}
else if (itemContributesToXBounds) {
if (getAutoSort()) {
this.minX = getX(0).doubleValue();
this.maxX = getX(getItemCount() - 1).doubleValue();
}
else {
findBoundsByIteration();
}
}
}
/**
* Finds the bounds of the x and y values for the series, by iterating
* through all the data items.
*
* @since 1.0.13
*/
private void findBoundsByIteration() {
this.minX = Double.NaN;
this.maxX = Double.NaN;
this.minY = Double.NaN;
this.maxY = Double.NaN;
Iterator iterator = this.data.iterator();
while (iterator.hasNext()) {
XYDataItem item = (XYDataItem) iterator.next();
updateBoundsForAddedItem(item);
}
}
/**
* Returns the flag that controls whether the items in the series are
* automatically sorted. There is no setter for this flag, it must be
* defined in the series constructor.
*
* @return A boolean.
*/
public boolean getAutoSort() {
return this.autoSort;
}
/**
* Returns a flag that controls whether duplicate x-values are allowed.
* This flag can only be set in the constructor.
*
* @return A boolean.
*/
public boolean getAllowDuplicateXValues() {
return this.allowDuplicateXValues;
}
/**
* Returns the number of items in the series.
*
* @return The item count.
*
* @see #getItems()
*/
public int getItemCount() {
return this.data.size();
}
/**
* Returns the list of data items for the series (the list contains
* {@link XYDataItem} objects and is unmodifiable).
*
* @return The list of data items.
*/
public List getItems() {
return Collections.unmodifiableList(this.data);
}
/**
* Returns the maximum number of items that will be retained in the series.
* The default value is <code>Integer.MAX_VALUE.
*
* @return The maximum item count.
*
* @see #setMaximumItemCount(int)
*/
public int getMaximumItemCount() {
return this.maximumItemCount;
}
/**
* Sets the maximum number of items that will be retained in the series.
* If you add a new item to the series such that the number of items will
* exceed the maximum item count, then the first element in the series is
* automatically removed, ensuring that the maximum item count is not
* exceeded.
* <p>
* Typically this value is set before the series is populated with data,
* but if it is applied later, it may cause some items to be removed from
* the series (in which case a {@link SeriesChangeEvent} will be sent to
* all registered listeners).
*
* @param maximum the maximum number of items for the series.
*/
public void setMaximumItemCount(int maximum) {
this.maximumItemCount = maximum;
int remove = this.data.size() - maximum;
if (remove > 0) {
this.data.subList(0, remove).clear();
findBoundsByIteration();
fireSeriesChanged();
}
}
/**
* Adds a data item to the series and sends a {@link SeriesChangeEvent} to
* all registered listeners.
*
* @param item the (x, y) item (<code>null not permitted).
*/
public void add(XYDataItem item) {
// argument checking delegated...
add(item, true);
}
/**
* Adds a data item to the series and sends a {@link SeriesChangeEvent} to
* all registered listeners.
*
* @param x the x value.
* @param y the y value.
*/
public void add(double x, double y) {
add(new Double(x), new Double(y), true);
}
/**
* Adds a data item to the series and, if requested, sends a
* {@link SeriesChangeEvent} to all registered listeners.
*
* @param x the x value.
* @param y the y value.
* @param notify a flag that controls whether or not a
* {@link SeriesChangeEvent} is sent to all registered
* listeners.
*/
public void add(double x, double y, boolean notify) {
add(new Double(x), new Double(y), notify);
}
/**
* Adds a data item to the series and sends a {@link SeriesChangeEvent} to
* all registered listeners. The unusual pairing of parameter types is to
* make it easier to add <code>null y-values.
*
* @param x the x value.
* @param y the y value (<code>null permitted).
*/
public void add(double x, Number y) {
add(new Double(x), y);
}
/**
* Adds a data item to the series and, if requested, sends a
* {@link SeriesChangeEvent} to all registered listeners. The unusual
* pairing of parameter types is to make it easier to add null y-values.
*
* @param x the x value.
* @param y the y value (<code>null permitted).
* @param notify a flag that controls whether or not a
* {@link SeriesChangeEvent} is sent to all registered
* listeners.
*/
public void add(double x, Number y, boolean notify) {
add(new Double(x), y, notify);
}
/**
* Adds a new data item to the series (in the correct position if the
* <code>autoSort flag is set for the series) and sends a
* {@link SeriesChangeEvent} to all registered listeners.
* <P>
* Throws an exception if the x-value is a duplicate AND the
* allowDuplicateXValues flag is false.
*
* @param x the x-value (<code>null not permitted).
* @param y the y-value (<code>null permitted).
*
* @throws SeriesException if the x-value is a duplicate and the
* <code>allowDuplicateXValues flag is not set for this series.
*/
public void add(Number x, Number y) {
// argument checking delegated...
add(x, y, true);
}
/**
* Adds new data to the series and, if requested, sends a
* {@link SeriesChangeEvent} to all registered listeners.
* <P>
* Throws an exception if the x-value is a duplicate AND the
* allowDuplicateXValues flag is false.
*
* @param x the x-value (<code>null not permitted).
* @param y the y-value (<code>null permitted).
* @param notify a flag the controls whether or not a
* {@link SeriesChangeEvent} is sent to all registered
* listeners.
*/
public void add(Number x, Number y, boolean notify) {
// delegate argument checking to XYDataItem...
XYDataItem item = new XYDataItem(x, y);
add(item, notify);
}
/**
* Adds a data item to the series and, if requested, sends a
* {@link SeriesChangeEvent} to all registered listeners.
*
* @param item the (x, y) item (<code>null not permitted).
* @param notify a flag that controls whether or not a
* {@link SeriesChangeEvent} is sent to all registered
* listeners.
*/
public void add(XYDataItem item, boolean notify) {
if (item == null) {
throw new IllegalArgumentException("Null 'item' argument.");
}
if (this.autoSort) {
int index = Collections.binarySearch(this.data, item);
if (index < 0) {
this.data.add(-index - 1, item);
}
else {
if (this.allowDuplicateXValues) {
// need to make sure we are adding *after* any duplicates
int size = this.data.size();
while (index < size && item.compareTo(
this.data.get(index)) == 0) {
index++;
}
if (index < this.data.size()) {
this.data.add(index, item);
}
else {
this.data.add(item);
}
}
else {
throw new SeriesException("X-value already exists.");
}
}
}
else {
if (!this.allowDuplicateXValues) {
// can't allow duplicate values, so we need to check whether
// there is an item with the given x-value already
int index = indexOf(item.getX());
if (index >= 0) {
throw new SeriesException("X-value already exists.");
}
}
this.data.add(item);
}
updateBoundsForAddedItem(item);
if (getItemCount() > this.maximumItemCount) {
XYDataItem removed = (XYDataItem) this.data.remove(0);
updateBoundsForRemovedItem(removed);
}
if (notify) {
fireSeriesChanged();
}
}
/**
* Deletes a range of items from the series and sends a
* {@link SeriesChangeEvent} to all registered listeners.
*
* @param start the start index (zero-based).
* @param end the end index (zero-based).
*/
public void delete(int start, int end) {
this.data.subList(start, end + 1).clear();
findBoundsByIteration();
fireSeriesChanged();
}
/**
* Removes the item at the specified index and sends a
* {@link SeriesChangeEvent} to all registered listeners.
*
* @param index the index.
*
* @return The item removed.
*/
public XYDataItem remove(int index) {
XYDataItem removed = (XYDataItem) this.data.remove(index);
updateBoundsForRemovedItem(removed);
fireSeriesChanged();
return removed;
}
/**
* Removes an item with the specified x-value and sends a
* {@link SeriesChangeEvent} to all registered listeners. Note that when
* a series permits multiple items with the same x-value, this method
* could remove any one of the items with that x-value.
*
* @param x the x-value.
* @return The item removed.
*/
public XYDataItem remove(Number x) {
return remove(indexOf(x));
}
/**
* Removes all data items from the series and sends a
* {@link SeriesChangeEvent} to all registered listeners.
*/
public void clear() {
if (this.data.size() > 0) {
this.data.clear();
this.minX = Double.NaN;
this.maxX = Double.NaN;
this.minY = Double.NaN;
this.maxY = Double.NaN;
fireSeriesChanged();
}
}
/**
* Return the data item with the specified index.
*
* @param index the index.
*
* @return The data item with the specified index.
*/
public XYDataItem getDataItem(int index) {
return (XYDataItem) this.data.get(index);
}
/**
* Returns the x-value at the specified index.
*
* @param index the index (zero-based).
*
* @return The x-value (never <code>null).
*/
public Number getX(int index) {
return getDataItem(index).getX();
}
/**
* Returns the y-value at the specified index.
*
* @param index the index (zero-based).
*
* @return The y-value (possibly <code>null).
*/
public Number getY(int index) {
return getDataItem(index).getY();
}
/**
* Updates the value of an item in the series and sends a
* {@link SeriesChangeEvent} to all registered listeners.
*
* @param index the item (zero based index).
* @param y the new value (<code>null permitted).
*
* @deprecated Renamed {@link #updateByIndex(int, Number)} to avoid
* confusion with the {@link #update(Number, Number)} method.
*/
public void update(int index, Number y) {
XYDataItem item = getDataItem(index);
// figure out if we need to iterate through all the y-values
boolean iterate = false;
double oldY = item.getYValue();
if (!Double.isNaN(oldY)) {
iterate = oldY <= this.minY || oldY >= this.maxY;
}
item.setY(y);
if (iterate) {
findBoundsByIteration();
}
else if (y != null) {
double yy = y.doubleValue();
this.minY = minIgnoreNaN(this.minY, yy);
this.maxY = maxIgnoreNaN(this.maxY, yy);
}
fireSeriesChanged();
}
/**
* A function to find the minimum of two values, but ignoring any
* Double.NaN values.
*
* @param a the first value.
* @param b the second value.
*
* @return The minimum of the two values.
*/
private double minIgnoreNaN(double a, double b) {
if (Double.isNaN(a)) {
return b;
}
else {
if (Double.isNaN(b)) {
return a;
}
else {
return Math.min(a, b);
}
}
}
/**
* A function to find the maximum of two values, but ignoring any
* Double.NaN values.
*
* @param a the first value.
* @param b the second value.
*
* @return The maximum of the two values.
*/
private double maxIgnoreNaN(double a, double b) {
if (Double.isNaN(a)) {
return b;
}
else {
if (Double.isNaN(b)) {
return a;
}
else {
return Math.max(a, b);
}
}
}
/**
* Updates the value of an item in the series and sends a
* {@link SeriesChangeEvent} to all registered listeners.
*
* @param index the item (zero based index).
* @param y the new value (<code>null permitted).
*
* @since 1.0.1
*/
public void updateByIndex(int index, Number y) {
update(index, y);
}
/**
* Updates an item in the series.
*
* @param x the x-value (<code>null not permitted).
* @param y the y-value (<code>null permitted).
*
* @throws SeriesException if there is no existing item with the specified
* x-value.
*/
public void update(Number x, Number y) {
int index = indexOf(x);
if (index < 0) {
throw new SeriesException("No observation for x = " + x);
}
else {
updateByIndex(index, y);
}
}
/**
* Adds or updates an item in the series and sends a
* {@link SeriesChangeEvent} to all registered listeners.
*
* @param x the x-value.
* @param y the y-value.
*
* @return The item that was overwritten, if any.
*
* @since 1.0.10
*/
public XYDataItem addOrUpdate(double x, double y) {
return addOrUpdate(new Double(x), new Double(y));
}
/**
* Adds or updates an item in the series and sends a
* {@link SeriesChangeEvent} to all registered listeners.
*
* @param x the x-value (<code>null not permitted).
* @param y the y-value (<code>null permitted).
*
* @return A copy of the overwritten data item, or <code>null if no
* item was overwritten.
*/
public XYDataItem addOrUpdate(Number x, Number y) {
if (x == null) {
throw new IllegalArgumentException("Null 'x' argument.");
}
if (this.allowDuplicateXValues) {
add(x, y);
return null;
}
// if we get to here, we know that duplicate X values are not permitted
XYDataItem overwritten = null;
int index = indexOf(x);
if (index >= 0) {
XYDataItem existing = (XYDataItem) this.data.get(index);
try {
overwritten = (XYDataItem) existing.clone();
}
catch (CloneNotSupportedException e) {
throw new SeriesException("Couldn't clone XYDataItem!");
}
// figure out if we need to iterate through all the y-values
boolean iterate = false;
double oldY = existing.getYValue();
if (!Double.isNaN(oldY)) {
iterate = oldY <= this.minY || oldY >= this.maxY;
}
existing.setY(y);
if (iterate) {
findBoundsByIteration();
}
else if (y != null) {
double yy = y.doubleValue();
this.minY = minIgnoreNaN(this.minY, yy);
this.maxY = minIgnoreNaN(this.maxY, yy);
}
}
else {
// if the series is sorted, the negative index is a result from
// Collections.binarySearch() and tells us where to insert the
// new item...otherwise it will be just -1 and we should just
// append the value to the list...
XYDataItem item = new XYDataItem(x, y);
if (this.autoSort) {
this.data.add(-index - 1, item);
}
else {
this.data.add(item);
}
updateBoundsForAddedItem(item);
// check if this addition will exceed the maximum item count...
if (getItemCount() > this.maximumItemCount) {
XYDataItem removed = (XYDataItem) this.data.remove(0);
updateBoundsForRemovedItem(removed);
}
}
fireSeriesChanged();
return overwritten;
}
/**
* Returns the index of the item with the specified x-value, or a negative
* index if the series does not contain an item with that x-value. Be
* aware that for an unsorted series, the index is found by iterating
* through all items in the series.
*
* @param x the x-value (<code>null not permitted).
*
* @return The index.
*/
public int indexOf(Number x) {
if (this.autoSort) {
return Collections.binarySearch(this.data, new XYDataItem(x, null));
}
else {
for (int i = 0; i < this.data.size(); i++) {
XYDataItem item = (XYDataItem) this.data.get(i);
if (item.getX().equals(x)) {
return i;
}
}
return -1;
}
}
/**
* Returns a new array containing the x and y values from this series.
*
* @return A new array containing the x and y values from this series.
*
* @since 1.0.4
*/
public double[][] toArray() {
int itemCount = getItemCount();
double[][] result = new double[2][itemCount];
for (int i = 0; i < itemCount; i++) {
result[0][i] = this.getX(i).doubleValue();
Number y = getY(i);
if (y != null) {
result[1][i] = y.doubleValue();
}
else {
result[1][i] = Double.NaN;
}
}
return result;
}
/**
* Returns a clone of the series.
*
* @return A clone of the series.
*
* @throws CloneNotSupportedException if there is a cloning problem.
*/
public Object clone() throws CloneNotSupportedException {
XYSeries clone = (XYSeries) super.clone();
clone.data = (List) ObjectUtilities.deepClone(this.data);
return clone;
}
/**
* Creates a new series by copying a subset of the data in this time series.
*
* @param start the index of the first item to copy.
* @param end the index of the last item to copy.
*
* @return A series containing a copy of this series from start until end.
*
* @throws CloneNotSupportedException if there is a cloning problem.
*/
public XYSeries createCopy(int start, int end)
throws CloneNotSupportedException {
XYSeries copy = (XYSeries) super.clone();
copy.data = new java.util.ArrayList();
if (this.data.size() > 0) {
for (int index = start; index <= end; index++) {
XYDataItem item = (XYDataItem) this.data.get(index);
XYDataItem clone = (XYDataItem) item.clone();
try {
copy.add(clone);
}
catch (SeriesException e) {
System.err.println("Unable to add cloned data item.");
}
}
}
return copy;
}
/**
* Tests this series for equality with an arbitrary object.
*
* @param obj the object to test against for equality
* (<code>null permitted).
*
* @return A boolean.
*/
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof XYSeries)) {
return false;
}
if (!super.equals(obj)) {
return false;
}
XYSeries that = (XYSeries) obj;
if (this.maximumItemCount != that.maximumItemCount) {
return false;
}
if (this.autoSort != that.autoSort) {
return false;
}
if (this.allowDuplicateXValues != that.allowDuplicateXValues) {
return false;
}
if (!ObjectUtilities.equal(this.data, that.data)) {
return false;
}
return true;
}
/**
* Returns a hash code.
*
* @return A hash code.
*/
public int hashCode() {
int result = super.hashCode();
// it is too slow to look at every data item, so let's just look at
// the first, middle and last items...
int count = getItemCount();
if (count > 0) {
XYDataItem item = getDataItem(0);
result = 29 * result + item.hashCode();
}
if (count > 1) {
XYDataItem item = getDataItem(count - 1);
result = 29 * result + item.hashCode();
}
if (count > 2) {
XYDataItem item = getDataItem(count / 2);
result = 29 * result + item.hashCode();
}
result = 29 * result + this.maximumItemCount;
result = 29 * result + (this.autoSort ? 1 : 0);
result = 29 * result + (this.allowDuplicateXValues ? 1 : 0);
return result;
}
}
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