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

Class SortedTableLookupStrategy

java.lang.Object

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

All Implemented Interfaces:

JoinExecTableLookupStrategy

public class SortedTableLookupStrategy
extends Object
implements JoinExecTableLookupStrategy

Lookup on an index that is a sorted index on a single property queried as a range.

Use the composite strategy if supporting multiple ranges or if range is in combination with unique key.

Constructor Summary

Constructors

Constructor and Description
SortedTableLookupStrategy(int lookupStream, int numStreams, QueryGraphValueEntryRange rangeKeyPair, Class coercionType, PropertySortedEventTable index)

Method Summary

Modifier and Type	Method and Description
PropertySortedEventTable	getIndex() Returns index to look up in.
LookupStrategyDesc	getStrategyDesc()
Set<EventBean>	lookup(EventBean theEvent, Cursor cursor, ExprEvaluatorContext exprEvaluatorContext) 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

SortedTableLookupStrategy

public SortedTableLookupStrategy(int lookupStream,
                                 int numStreams,
                                 QueryGraphValueEntryRange rangeKeyPair,
                                 Class coercionType,
                                 PropertySortedEventTable index)

Method Detail

getIndex

public PropertySortedEventTable getIndex()

Returns index to look up in.

Returns:

index to use

lookup

public 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 String toString()

Overrides:

toString in class Object

getStrategyDesc

public LookupStrategyDesc getStrategyDesc()

Specified by:

getStrategyDesc in interface JoinExecTableLookupStrategy