com.redhat.lightblue.assoc

Class QueryPlanChooser

java.lang.Object

com.redhat.lightblue.assoc.QueryPlanChooser

public class QueryPlanChooser
extends Object

Constructor Summary

Constructors

Constructor and Description
QueryPlanChooser(CompositeMetadata cmd, QueryPlanIterator qpitr, QueryPlanScorer scorer, QueryExpression requestQuery, Set<CompositeMetadata> filter)

Method Summary

Methods

Modifier and Type	Method and Description
QueryPlan	choose() Chooses the best query play after scoring all possible plans.
QueryPlan	getBestPlan() Returns the best plan chosen so far
CompositeMetadata	getMetadata() Return the root metadata
QueryPlan	getQueryPlan() Returns the query plan that's currently chosen
QueryExpression	getRequestQuery() Return the query expression coming from the request
void	reset() Resets the query chooser to a state where it can start evaluating the query plans again

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryPlanChooser

public QueryPlanChooser(CompositeMetadata cmd,
                QueryPlanIterator qpitr,
                QueryPlanScorer scorer,
                QueryExpression requestQuery,
                Set<CompositeMetadata> filter)

Method Detail

getMetadata

public CompositeMetadata getMetadata()

Return the root metadata

getRequestQuery

public QueryExpression getRequestQuery()

Return the query expression coming from the request

getQueryPlan

public QueryPlan getQueryPlan()

Returns the query plan that's currently chosen

getBestPlan

public QueryPlan getBestPlan()

Returns the best plan chosen so far

reset

public void reset()

Resets the query chooser to a state where it can start evaluating the query plans again

choose

public QueryPlan choose()

Chooses the best query play after scoring all possible plans.