public class LastElementView extends ViewSupport implements CloneableView, DataWindowView
Thus if 5 pieces of new data arrive, the child view receives 5 elements of new data and also 4 pieces of old data which is the first 4 elements of new data. I.e. New data elements immediatly gets to be old data elements.
Old data received from parent is not handled, it is ignored. We thus post old data as follows: last event is not null + new data from index zero to N-1, where N is the index of the last element in new data
| Modifier and Type | Field and Description |
|---|---|
protected EventBean |
lastEvent
The last new element posted from a parent view.
|
EMPTY_VIEW_ARRAY, parent| Constructor and Description |
|---|
LastElementView(LastElementViewFactory viewFactory) |
| Modifier and Type | Method and Description |
|---|---|
View |
cloneView()
Duplicates the view.
|
EventType |
getEventType()
Provides metadata information about the type of object the event collection contains.
|
ViewFactory |
getViewFactory() |
Iterator<EventBean> |
iterator()
Allows iteration through all elements in this event collection.
|
String |
toString() |
void |
update(EventBean[] newData,
EventBean[] oldData)
Notify that data has been added or removed from the Viewable parent.
|
void |
visitView(ViewDataVisitor viewDataVisitor) |
addView, addView, dumpChildViews, dumpUpdateParams, dumpUpdateParams, findDescendent, findViewIndex, getParent, getViews, hasViews, removeAllViews, removeView, removeView, setParent, updateChildren, updateChildrenclone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitaddView, getViews, hasViews, removeAllViews, removeViewforEach, spliteratorprotected EventBean lastEvent
public LastElementView(LastElementViewFactory viewFactory)
public View cloneView()
CloneableViewExpected to return a same view in initialized state for grouping.
cloneView in interface CloneableViewpublic final EventType getEventType()
EventCollectiongetEventType in interface EventCollectionpublic void update(EventBean[] newData, EventBean[] oldData)
ViewIf the call to update contains new (inserted) data, then the first argument will be a non-empty list and the second will be empty. Similarly, if the call is a notification of deleted data, then the first argument will be empty and the second will be non-empty. Either the newData or oldData will be non-null. This method won't be called with both arguments being null, but either one could be null. The same is true for zero-length arrays. Either newData or oldData will be non-empty. If both are non-empty, then the update is a modification notification.
When update() is called on a view by the parent object, the data in newData will be in the collection of the parent, and its data structures will be arranged to reflect that. The data in oldData will not be in the parent's data structures, and any access to the parent will indicate that that data is no longer there.
public final Iterator<EventBean> iterator()
EventCollectioniterator in interface EventCollectioniterator in interface Iterable<EventBean>public void visitView(ViewDataVisitor viewDataVisitor)
visitView in interface ViewDataVisitablepublic ViewFactory getViewFactory()
getViewFactory in interface GroupableView