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

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

All Implemented Interfaces:

OptimizerRule

@Immutable
public class RewriteAsRangeCriteria
extends Object
implements OptimizerRule

An optimizer rule that rewrites two AND-ed Constraints that constraint a dynamic operand to a range of values as a single Between constraint. This rule also collapses and removes any constraints that are unnecessary because other constraints are more restrictive or because they cancel out other constraints.

Field Summary

static RewriteAsRangeCriteria

INSTANCE

Constructor Summary

RewriteAsRangeCriteria()

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 RewriteAsRangeCriteria INSTANCE

Constructor Detail

RewriteAsRangeCriteria

public RewriteAsRangeCriteria()

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()