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

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

All Implemented Interfaces:

JoinExecTableLookupStrategy

public class IndexedTableLookupStrategyExpr
extends java.lang.Object
implements JoinExecTableLookupStrategy

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

Constructor Summary

IndexedTableLookupStrategyExpr(ExprEvaluator[] evaluators, int streamNum, PropertyIndexedEventTable index, LookupStrategyDesc lookupStrategyDesc)
Ctor.

Method Summary

PropertyIndexedEventTable	getIndex() Returns index to look up in.
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

IndexedTableLookupStrategyExpr

public IndexedTableLookupStrategyExpr(ExprEvaluator[] evaluators,
                                      int streamNum,
                                      PropertyIndexedEventTable index,
                                      LookupStrategyDesc lookupStrategyDesc)

Ctor.

Parameters:

index - - index to look up in

Method Detail

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