com.espertech.esper.epl.join.table

Class PropertyIndexedEventTableSingleUnadorned

java.lang.Object

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

com.espertech.esper.epl.join.table.PropertyIndexedEventTableSingleUnadorned

All Implemented Interfaces:

EventTable, Iterable<EventBean>

Direct Known Subclasses:

PropertyIndexedEventTableSingleCoerceAdd

public class PropertyIndexedEventTableSingleUnadorned
extends PropertyIndexedEventTableSingle

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 Map<Object,Set<EventBean>>	propertyIndex

Fields inherited from class com.espertech.esper.epl.join.table.PropertyIndexedEventTableSingle

organization, propertyGetter

Constructor Summary

Constructors

Constructor and Description
PropertyIndexedEventTableSingleUnadorned(EventPropertyGetter propertyGetter, EventTableOrganization organization)

Method Summary

Modifier and Type	Method and Description
void	add(EventBean theEvent, ExprEvaluatorContext exprEvaluatorContext) Add event to table.
void	clear() Clear out index.
void	destroy() Destroy index.
Object	getIndex() Return the index object itself, or an object-array for multiple index structures.
Integer	getNumberOfEvents() If the number of events is readily available, an implementation will return that number or it may return null to indicate that the count is not readily available.
int	getNumKeys() If the index retains events using some key-based organization this returns the number of keys, and may return -1 to indicate that either the number of keys is not available or costly to obtain.
Class	getProviderClass()
boolean	isEmpty() Returns true if the index is definitely empty, or false if is not definitely empty but we can not certain.
Iterator<EventBean>	iterator() Returns an iterator over events in the table.
Set<EventBean>	lookup(Object key) Returns the set of events that have the same property value as the given event.
void	remove(EventBean theEvent, ExprEvaluatorContext exprEvaluatorContext) Remove event from table.

Methods inherited from class com.espertech.esper.epl.join.table.PropertyIndexedEventTableSingle

add, addRemove, getKey, getOrganization, remove, toQueryPlan, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

propertyIndex

protected final Map<Object,Set<EventBean>> propertyIndex

Constructor Detail

PropertyIndexedEventTableSingleUnadorned

public PropertyIndexedEventTableSingleUnadorned(EventPropertyGetter propertyGetter,
                                                EventTableOrganization organization)

Method Detail

lookup

public Set<EventBean> lookup(Object key)

Returns the set of events that have the same property value as the given event.

Specified by:

lookup in class PropertyIndexedEventTableSingle

Parameters:

key - to compare against

Returns:

set of events with property value, or null if none found (never returns zero-sized set)

add

public void add(EventBean theEvent,
                ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: EventTable

Add event to table.

Parameters:

theEvent - to add

exprEvaluatorContext - evaluator context

remove

public void remove(EventBean theEvent,
                   ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: EventTable

Remove event from table.

Parameters:

theEvent - to remove

exprEvaluatorContext - evaluator context

isEmpty

public boolean isEmpty()

Description copied from interface: EventTable

Returns true if the index is definitely empty, or false if is not definitely empty but we can not certain.

Returns:

true for definitely empty index, false for there-may-be-rows and please-check-by-iterating

iterator

public Iterator<EventBean> iterator()

Description copied from interface: EventTable

Returns an iterator over events in the table. Not required to be implemented for all indexes. Full table scans and providers that have easy access to an iterator may implement.

Returns:

table iterator

clear

public void clear()

Description copied from interface: EventTable

Clear out index.

destroy

public void destroy()

Description copied from interface: EventTable

Destroy index.

getNumberOfEvents

public Integer getNumberOfEvents()

Description copied from interface: EventTable

If the number of events is readily available, an implementation will return that number or it may return null to indicate that the count is not readily available.

Returns:

number of events

getNumKeys

public int getNumKeys()

Description copied from interface: EventTable

If the index retains events using some key-based organization this returns the number of keys, and may return -1 to indicate that either the number of keys is not available or costly to obtain.

The number returned can be an estimate and may not be accurate.

Returns:

number of keys

getIndex

public Object getIndex()

Description copied from interface: EventTable

Return the index object itself, or an object-array for multiple index structures.

May return null if the information is not readily available, i.e. externally maintained index

Returns:

index object

getProviderClass

public Class getProviderClass()