/* ===========================================================
* 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.]
*
* ---------------------------
* ComparableObjectSeries.java
* ---------------------------
* (C) Copyright 2006-2008, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): -;
*
* Changes
* -------
* 19-Oct-2006 : New class (DG);
* 31-Oct-2007 : Implemented faster hashCode() (DG);
* 27-Nov-2007 : Changed clear() from protected to public (DG);
*
*/
package org.jfree.data;
import java.io.Serializable;
import java.util.Collections;
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;
/**
* A (possibly ordered) list of (Comparable, Object) data items.
*
* @since 1.0.3
*/
public class ComparableObjectSeries extends Series
implements Cloneable, Serializable {
/** 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. */
private boolean autoSort;
/** A flag that controls whether or not duplicate x-values are allowed. */
private boolean allowDuplicateXValues;
/**
* 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</code> not permitted).
*/
public ComparableObjectSeries(Comparable key) {
this(key, true, true);
}
/**
* Constructs a new 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</code> 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 ComparableObjectSeries(Comparable key, boolean autoSort,
boolean allowDuplicateXValues) {
super(key);
this.data = new java.util.ArrayList();
this.autoSort = autoSort;
this.allowDuplicateXValues = allowDuplicateXValues;
}
/**
* 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.
*/
public int getItemCount() {
return this.data.size();
}
/**
* Returns the maximum number of items that will be retained in the series.
* The default value is <code>Integer.MAX_VALUE</code>.
*
* @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;
boolean dataRemoved = false;
while (this.data.size() > maximum) {
this.data.remove(0);
dataRemoved = true;
}
if (dataRemoved) {
fireSeriesChanged();
}
}
/**
* Adds new data to 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</code> not permitted).
* @param y the y-value (<code>null</code> permitted).
*/
protected void add(Comparable x, Object 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</code> not permitted).
* @param y the y-value (<code>null</code> permitted).
* @param notify a flag the controls whether or not a
* {@link SeriesChangeEvent} is sent to all registered
* listeners.
*/
protected void add(Comparable x, Object y, boolean notify) {
// delegate argument checking to XYDataItem...
ComparableObjectItem item = new ComparableObjectItem(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</code> not permitted).
* @param notify a flag that controls whether or not a
* {@link SeriesChangeEvent} is sent to all registered
* listeners.
*/
protected void add(ComparableObjectItem 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.getComparable());
if (index >= 0) {
throw new SeriesException("X-value already exists.");
}
}
this.data.add(item);
}
if (getItemCount() > this.maximumItemCount) {
this.data.remove(0);
}
if (notify) {
fireSeriesChanged();
}
}
/**
* 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</code> not permitted).
*
* @return The index.
*/
public int indexOf(Comparable x) {
if (this.autoSort) {
return Collections.binarySearch(this.data, new ComparableObjectItem(
x, null));
}
else {
for (int i = 0; i < this.data.size(); i++) {
ComparableObjectItem item = (ComparableObjectItem)
this.data.get(i);
if (item.getComparable().equals(x)) {
return i;
}
}
return -1;
}
}
/**
* Updates an item in the series.
*
* @param x the x-value (<code>null</code> not permitted).
* @param y the y-value (<code>null</code> permitted).
*
* @throws SeriesException if there is no existing item with the specified
* x-value.
*/
protected void update(Comparable x, Object y) {
int index = indexOf(x);
if (index < 0) {
throw new SeriesException("No observation for x = " + x);
}
else {
ComparableObjectItem item = getDataItem(index);
item.setObject(y);
fireSeriesChanged();
}
}
/**
* 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</code> permitted).
*/
protected void updateByIndex(int index, Object y) {
ComparableObjectItem item = getDataItem(index);
item.setObject(y);
fireSeriesChanged();
}
/**
* Return the data item with the specified index.
*
* @param index the index.
*
* @return The data item with the specified index.
*/
protected ComparableObjectItem getDataItem(int index) {
return (ComparableObjectItem) this.data.get(index);
}
/**
* 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).
*/
protected void delete(int start, int end) {
for (int i = start; i <= end; i++) {
this.data.remove(start);
}
fireSeriesChanged();
}
/**
* Removes all data items from the series and, unless the series is
* already empty, sends a {@link SeriesChangeEvent} to all registered
* listeners.
*/
public void clear() {
if (this.data.size() > 0) {
this.data.clear();
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.
*/
protected ComparableObjectItem remove(int index) {
ComparableObjectItem result = (ComparableObjectItem) this.data.remove(
index);
fireSeriesChanged();
return result;
}
/**
* Removes the item with the specified x-value and sends a
* {@link SeriesChangeEvent} to all registered listeners.
*
* @param x the x-value.
* @return The item removed.
*/
public ComparableObjectItem remove(Comparable x) {
return remove(indexOf(x));
}
/**
* Tests this series for equality with an arbitrary object.
*
* @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 ComparableObjectSeries)) {
return false;
}
if (!super.equals(obj)) {
return false;
}
ComparableObjectSeries that = (ComparableObjectSeries) 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) {
ComparableObjectItem item = getDataItem(0);
result = 29 * result + item.hashCode();
}
if (count > 1) {
ComparableObjectItem item = getDataItem(count - 1);
result = 29 * result + item.hashCode();
}
if (count > 2) {
ComparableObjectItem 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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