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

Class CompositeTableLookupStrategy

java.lang.Object

com.espertech.esper.epl.join.exec.base.CompositeTableLookupStrategy

All Implemented Interfaces:

JoinExecTableLookupStrategy

public class CompositeTableLookupStrategy
extends Object
implements JoinExecTableLookupStrategy

Lookup on an nested map structure that represents an index for use with at least one range and possibly multiple ranges and optionally keyed by one or more unique keys.

Use the sorted strategy instead if supporting a single range only and no other unique keys are part of the index.

Constructor Summary

Constructors

Constructor and Description
CompositeTableLookupStrategy(EventType eventType, int lookupStream, List<QueryGraphValueEntryHashKeyed> hashKeys, List<QueryGraphValueEntryRange> rangeKeyPairs, PropertyCompositeEventTable index)

Method Summary

Modifier and Type	Method and Description
EventType	getEventType() Returns event type of the lookup event.
PropertyCompositeEventTable	getIndex() Returns index to look up in.
LookupStrategyDesc	getStrategyDesc()
Set<EventBean>	lookup(EventBean theEvent, Cursor cursor, ExprEvaluatorContext context) Returns matched events for a event to look up for.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

CompositeTableLookupStrategy

public CompositeTableLookupStrategy(EventType eventType,
                                    int lookupStream,
                                    List<QueryGraphValueEntryHashKeyed> hashKeys,
                                    List<QueryGraphValueEntryRange> rangeKeyPairs,
                                    PropertyCompositeEventTable index)

Method Detail

getEventType

public EventType getEventType()

Returns event type of the lookup event.

Returns:

event type of the lookup event

getIndex

public PropertyCompositeEventTable getIndex()

Returns index to look up in.

Returns:

index to use

lookup

public Set<EventBean> lookup(EventBean theEvent,
                             Cursor cursor,
                             ExprEvaluatorContext context)

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

context - expression evaluation context

Returns:

set of matching events, or null if none matching

getStrategyDesc

public LookupStrategyDesc getStrategyDesc()

Specified by:

getStrategyDesc in interface JoinExecTableLookupStrategy

toString

public String toString()

Overrides:

toString in class Object