com.espertech.esper.epl.join.table

Class PropertyIndexedEventTableSingle

java.lang.Object

com.espertech.esper.epl.join.table.PropertyIndexedEventTableSingle

All Implemented Interfaces:

EventTable, java.lang.Iterable<EventBean>

Direct Known Subclasses:

PropertyIndexedEventTableSingleUnadorned, PropertyIndexedEventTableSingleUnique

public abstract class PropertyIndexedEventTableSingle
extends java.lang.Object
implements EventTable

Index that organizes events by the event property values into hash buckets. Based on a HashMap with MultiKeyUntyped keys that store the property values.

Field Summary

Fields

Modifier and Type	Field and Description
protected EventTableOrganization	organization
protected EventPropertyGetter	propertyGetter

Constructor Summary

Constructors

Constructor and Description
PropertyIndexedEventTableSingle(EventPropertyGetter propertyGetter, EventTableOrganization organization)

Method Summary

Modifier and Type	Method and Description
void	add(EventBean[] events, ExprEvaluatorContext exprEvaluatorContext) Add an array of events.
void	addRemove(EventBean[] newData, EventBean[] oldData, ExprEvaluatorContext exprEvaluatorContext) Add and remove events from table.
protected java.lang.Object	getKey(EventBean theEvent) Determine multikey for index access.
EventTableOrganization	getOrganization()
abstract java.util.Set<EventBean>	lookup(java.lang.Object key)
void	remove(EventBean[] events, ExprEvaluatorContext exprEvaluatorContext) Remove events.
java.lang.String	toQueryPlan()
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.espertech.esper.epl.join.table.EventTable

add, clear, destroy, getIndex, getNumberOfEvents, getNumKeys, getProviderClass, isEmpty, iterator, remove

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

propertyGetter

protected final EventPropertyGetter propertyGetter

organization

protected final EventTableOrganization organization

Constructor Detail

PropertyIndexedEventTableSingle

public PropertyIndexedEventTableSingle(EventPropertyGetter propertyGetter,
                                       EventTableOrganization organization)

Method Detail

lookup

public abstract java.util.Set<EventBean> lookup(java.lang.Object key)

getKey

protected java.lang.Object getKey(EventBean theEvent)

Determine multikey for index access.

Parameters:

theEvent - to get properties from for key

Returns:

multi key

addRemove

public void addRemove(EventBean[] newData,
                      EventBean[] oldData,
                      ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: EventTable

Add and remove events from table.

It is up to the index to decide whether to add first and then remove, or whether to remove and then add.

It is important to note that a given event can be in both the removed and the added events. This means that unique indexes probably need to remove first and then add. Most other non-unique indexes will add first and then remove since the an event can be both in the add and the remove stream.

Specified by:

addRemove in interface EventTable

Parameters:

newData - to add

oldData - to remove

exprEvaluatorContext - evaluator context

add

public void add(EventBean[] events,
                ExprEvaluatorContext exprEvaluatorContext)

Add an array of events. Same event instance is not added twice. Event properties should be immutable. Allow null passed instead of an empty array.

Specified by:

add in interface EventTable

Parameters:

events - to add

exprEvaluatorContext - evaluator context

Throws:

java.lang.IllegalArgumentException - if the event was already existed in the index

remove

public void remove(EventBean[] events,
                   ExprEvaluatorContext exprEvaluatorContext)

Remove events.

Specified by:

remove in interface EventTable

Parameters:

events - to be removed, can be null instead of an empty array.

exprEvaluatorContext - evaluator context

Throws:

java.lang.IllegalArgumentException - when the event could not be removed as its not in the index

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

toQueryPlan

public java.lang.String toQueryPlan()

Specified by:

toQueryPlan in interface EventTable

getOrganization

public EventTableOrganization getOrganization()

Specified by:

getOrganization in interface EventTable