com.espertech.esper.common.internal.view.core

Class ViewNoop

java.lang.Object

com.espertech.esper.common.internal.view.core.ViewNoop

All Implemented Interfaces:

View, Viewable, Iterable<EventBean>

public class ViewNoop
extends Object
implements View

Field Summary

Fields

Modifier and Type	Field and Description
static ViewNoop	INSTANCE

Method Summary

Modifier and Type	Method and Description
View	getChild()
EventType	getEventType() Provides metadata information about the type of object the event collection contains.
Viewable	getParent() Returns the View's parent Viewable.
Iterator<EventBean>	iterator() Allows iteration through all elements in this viewable.
void	setChild(View view)
void	setParent(Viewable parent) Called when the View is added to a Viewable object.
void	update(EventBean[] newData, EventBean[] oldData) Notify that data has been added or removed from the Viewable parent.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

INSTANCE

public static final ViewNoop INSTANCE

Method Detail

getParent

public Viewable getParent()

Description copied from interface: View

Returns the View's parent Viewable.

Specified by:

getParent in interface View

Returns:

viewable

setParent

public void setParent(Viewable parent)

Description copied from interface: View

Called when the View is added to a Viewable object.

Specified by:

setParent in interface View

Parameters:

parent - is the parent that this view is a child of

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.

Specified by:

update in interface View

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

setChild

public void setChild(View view)

Specified by:

setChild in interface Viewable

getChild

public View getChild()

Specified by:

getChild in interface Viewable

getEventType

public EventType getEventType()

Description copied from interface: Viewable

Provides metadata information about the type of object the event collection contains.

Specified by:

getEventType in interface Viewable

Returns:

metadata for the objects in the collection

iterator

public Iterator<EventBean> iterator()

Description copied from interface: Viewable

Allows iteration through all elements in this viewable. The iterator will return the elements in the collection in their natural order, or, if there is no natural ordering, in some unpredictable order.

Specified by:

iterator in interface Viewable

Specified by:

iterator in interface Iterable<EventBean>

Returns:

an iterator which will go through all current elements in the collection.