/**
* 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;
}
/**
* 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.
*/
public void add(XYDataItem item, boolean notify) {
ParamChecks.nullNotPermitted(item, "item");
item = (XYDataItem) item.clone();
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();
}
}
/**
* 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;
}