org.modeshape.jcr.query.optimize
Class RewritePathAndNameCriteria

java.lang.Object
  org.modeshape.jcr.query.optimize.RewritePathAndNameCriteria

All Implemented Interfaces:

OptimizerRule

@Immutable
public class RewritePathAndNameCriteria
extends Object
implements OptimizerRule

An optimizer rule that rewrites Constraint trees, moving path-, name-, or depth-oriented criteria to the left-most parts of the constraint tree.

Field Summary

static RewritePathAndNameCriteria

INSTANCE

Constructor Summary

RewritePathAndNameCriteria()

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.
protected boolean	isPathOriented(DynamicOperand op)
protected Constraint	rewriteCriteria(QueryContext context, Constraint constraint)
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final RewritePathAndNameCriteria INSTANCE

Constructor Detail

RewritePathAndNameCriteria

public RewritePathAndNameCriteria()

Method Detail

execute

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

Description copied from interface: OptimizerRule

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

rewriteCriteria

protected Constraint rewriteCriteria(QueryContext context,
                                     Constraint constraint)

isPathOriented

protected boolean isPathOriented(DynamicOperand op)

toString

public String toString()

Overrides:

toString in class Object