com.espertech.esper.epl.join.plan

Class OuterJoinAnalyzer

java.lang.Object

com.espertech.esper.epl.join.plan.OuterJoinAnalyzer

public class OuterJoinAnalyzer
extends java.lang.Object

Analyzes an outer join descriptor list and builds a query graph model from it. The 'on' expression identifiers are extracted and placed in the query graph model as navigable relationships (by key and index properties) between streams.

Constructor Summary

Constructors

Constructor and Description
OuterJoinAnalyzer()

Method Summary

Modifier and Type	Method and Description
static QueryGraph	analyze(OuterJoinDesc[] outerJoinDescList, QueryGraph queryGraph) Analyzes the outer join descriptor list to build a query graph model.
static boolean	optionalStreamsIfAny(OuterJoinDesc[] outerJoinDescList)

Methods inherited from class java.lang.Object

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

Constructor Detail

OuterJoinAnalyzer

public OuterJoinAnalyzer()

Method Detail

analyze

public static QueryGraph analyze(OuterJoinDesc[] outerJoinDescList,
                                 QueryGraph queryGraph)

Analyzes the outer join descriptor list to build a query graph model.

Parameters:

outerJoinDescList - - list of outer join descriptors

queryGraph - - model containing relationships between streams that is written into

Returns:

queryGraph object

optionalStreamsIfAny

public static boolean optionalStreamsIfAny(OuterJoinDesc[] outerJoinDescList)