/**
* 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</code> 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();
}
}
}
/**
* 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 or updates an item in the series and sends a {@link SeriesChangeEvent} to all registered
* listeners.
*
* @param item the data item (<code>null</code> not permitted).
* @return A copy of the overwritten data item, or <code>null</code> if no item was overwritten.
* @since 1.0.14
*/
public XYDataItem addOrUpdate(XYDataItem item) {
ParamChecks.nullNotPermitted(item, "item");
if (this.allowDuplicateXValues) {
add(item);
return null;
}
// if we get to here, we know that duplicate X values are not permitted
XYDataItem overwritten = null;
int index = indexOf(item.getX());
if (index >= 0) {
XYDataItem existing = (XYDataItem) this.data.get(index);
overwritten = (XYDataItem) existing.clone();
// 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(item.getY());
if (iterate) {
findBoundsByIteration();
} else if (item.getY() != null) {
double yy = item.getY().doubleValue();
this.minY = minIgnoreNaN(this.minY, yy);
this.maxY = maxIgnoreNaN(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...
item = (XYDataItem) item.clone();
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;
}
/**
* 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).
* @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 = getRawDataItem(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();
}
/**
* 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();
}