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 java.lang.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

SortedTableLookupStrategy(int lookupStream, int numStreams, QueryGraphValueEntryRange rangeKeyPair, java.lang.Class coercionType, PropertySortedEventTable index)
Ctor.

Method Summary

PropertySortedEventTable	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

SortedTableLookupStrategy

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

Ctor.

Parameters:

index - - index to look up in

Method Detail

getIndex

public PropertySortedEventTable 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