com.espertech.esper.epl.join.exec.base
Class IndexedTableLookupStrategy

java.lang.Object
  com.espertech.esper.epl.join.exec.base.IndexedTableLookupStrategy

All Implemented Interfaces:

JoinExecTableLookupStrategy

public class IndexedTableLookupStrategy
extends java.lang.Object
implements JoinExecTableLookupStrategy

Lookup on an index using a set of properties as key values.

Constructor Summary

IndexedTableLookupStrategy(EventType eventType, java.lang.String[] properties, PropertyIndexedEventTable index)
Ctor.

Method Summary

EventType	getEventType() Returns event type of the lookup event.
PropertyIndexedEventTable	getIndex() Returns index to look up in.
java.lang.String[]	getProperties() Returns properties to use from lookup event to look up in index.
LookupStrategyDesc	getStrategyDesc()
java.util.Set<EventBean>	lookup(EventBean theEvent, Cursor cursor, ExprEvaluatorContext exprEvaluatorContext) Returns matched events for a event to look up for.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

IndexedTableLookupStrategy

public IndexedTableLookupStrategy(EventType eventType,
                                  java.lang.String[] properties,
                                  PropertyIndexedEventTable index)

Ctor.

Parameters:

eventType - - event type to expect for lookup

properties - - key properties

index - - index to look up in

Method Detail

getEventType

public EventType getEventType()

Returns event type of the lookup event.

Returns:

event type of the lookup event

getProperties

public java.lang.String[] getProperties()

Returns properties to use from lookup event to look up in index.

Returns:

properties to use from lookup event

getIndex

public PropertyIndexedEventTable getIndex()

Returns index to look up in.

Returns:

index to use

lookup

public java.util.Set<EventBean> lookup(EventBean theEvent,
                                       Cursor cursor,
                                       ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: JoinExecTableLookupStrategy

Returns matched events for a event to look up for. Never returns an empty result set, always returns null to indicate no results.

Specified by:

lookup in interface JoinExecTableLookupStrategy

Parameters:

theEvent - to look up

cursor - the path in the query that the lookup took

exprEvaluatorContext - expression evaluation context

Returns:

set of matching events, or null if none matching

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getStrategyDesc

public LookupStrategyDesc getStrategyDesc()

Specified by:

getStrategyDesc in interface JoinExecTableLookupStrategy