org.jboss.dna.graph.query.optimize
Class RightOuterToLeftOuterJoins

java.lang.Object
  org.jboss.dna.graph.query.optimize.RightOuterToLeftOuterJoins

All Implemented Interfaces:

OptimizerRule

@Immutable
public class RightOuterToLeftOuterJoins
extends Object
implements OptimizerRule

An optimizer rule that converts right outer joins into left outer joins.

Field Summary

static RightOuterToLeftOuterJoins

INSTANCE

Constructor Summary

RightOuterToLeftOuterJoins()

Method Summary

PlanNode	execute(QueryContext context, PlanNode plan, LinkedList<OptimizerRule> ruleStack) Optimize the supplied plan using the supplied context, hints, and yet-to-be-run rules.
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

INSTANCE

public static final RightOuterToLeftOuterJoins INSTANCE

Constructor Detail

RightOuterToLeftOuterJoins

public RightOuterToLeftOuterJoins()

Method Detail

execute

public PlanNode execute(QueryContext context,
                        PlanNode plan,
                        LinkedList<OptimizerRule> ruleStack)

Optimize the supplied plan using the supplied context, hints, and yet-to-be-run rules.

Specified by:

execute in interface OptimizerRule

Parameters:

context - the context in which the query is being optimized; never null

plan - the plan to be optimized; never null

ruleStack - the stack of rules that will be run after this rule; never null

Returns:

the optimized plan; never null

See Also:

OptimizerRule.execute(org.jboss.dna.graph.query.QueryContext, org.jboss.dna.graph.query.plan.PlanNode, java.util.LinkedList)

toString

public String toString()

Overrides:

toString in class Object

See Also:

Object.toString()