com.espertech.esper.epl.named
Class NamedWindowOnExprBaseView

java.lang.Object
  com.espertech.esper.view.ViewSupport
      com.espertech.esper.epl.named.NamedWindowOnExprBaseView

All Implemented Interfaces:

EventCollection, View, Viewable, java.lang.Iterable<EventBean>

Direct Known Subclasses:

NamedWindowOnDeleteView, NamedWindowOnMergeView, NamedWindowOnSelectView, NamedWindowOnUpdateView

public abstract class NamedWindowOnExprBaseView
extends ViewSupport

View for the on-delete statement that handles removing events from a named window.

Field Summary

protected NamedWindowRootViewInstance

rootView The root view accepting removals (old data).

Fields inherited from class com.espertech.esper.view.ViewSupport

EMPTY_VIEW_ARRAY, parent

Constructor Summary

NamedWindowOnExprBaseView(SubordWMatchExprLookupStrategy lookupStrategy, NamedWindowRootViewInstance rootView, ExprEvaluatorContext exprEvaluatorContext)
Ctor.

Method Summary

ExprEvaluatorContext	getExprEvaluatorContext() returns expr context.
abstract void	handleMatching(EventBean[] triggerEvents, EventBean[] matchingEvents) Implemented by on-trigger views to action on the combination of trigger and matching events in the named window.
void	update(EventBean[] newData, EventBean[] oldData) Notify that data has been added or removed from the Viewable parent.

Methods inherited from class com.espertech.esper.view.ViewSupport

addView, addView, dumpChildViews, dumpUpdateParams, dumpUpdateParams, findDescendent, findViewIndex, getParent, getViews, hasViews, removeAllViews, removeView, removeView, setParent, updateChildren, updateChildren

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.espertech.esper.view.EventCollection

getEventType, iterator

Field Detail

rootView

protected final NamedWindowRootViewInstance rootView

The root view accepting removals (old data).

Constructor Detail

NamedWindowOnExprBaseView

public NamedWindowOnExprBaseView(SubordWMatchExprLookupStrategy lookupStrategy,
                                 NamedWindowRootViewInstance rootView,
                                 ExprEvaluatorContext exprEvaluatorContext)

Ctor.

Parameters:

lookupStrategy - for handling trigger events to determine deleted events

rootView - to indicate which events to delete

exprEvaluatorContext - context for expression evalauation

Method Detail

handleMatching

public abstract void handleMatching(EventBean[] triggerEvents,
                                    EventBean[] matchingEvents)

Implemented by on-trigger views to action on the combination of trigger and matching events in the named window.

Parameters:

triggerEvents - is the trigger events (usually 1)

matchingEvents - is the matching events retrieved via lookup strategy

update

public void update(EventBean[] newData,
                   EventBean[] oldData)

Description copied from interface: View

Notify that data has been added or removed from the Viewable parent. The last object in the newData array of objects would be the newest object added to the parent view. The first object of the oldData array of objects would be the oldest object removed from the parent view. If 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.

Parameters:

newData - is the new data that has been added to the parent view

oldData - is the old data that has been removed from the parent view

getExprEvaluatorContext

public ExprEvaluatorContext getExprEvaluatorContext()

returns expr context.

Returns:

context