com.redhat.lightblue.assoc.scorers

Class IndexedFieldScorer

java.lang.Object

com.redhat.lightblue.assoc.scorers.IndexedFieldScorer

All Implemented Interfaces:

QueryPlanScorer, Serializable

public class IndexedFieldScorer
extends Object
implements QueryPlanScorer, Serializable

Query plan scoring based on search clauses on indexed fields. These are the heuristics it uses:

• No indexed queries on any node: MAX
• We want nodes with indexed queries as close to the sources as possible
• We want the root node to be the last indexed query node, if there is indexed queries for root node

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
IndexedFieldScorer()

Method Summary

Modifier and Type	Method and Description
QueryPlanData	newDataInstance() Returns a new instance for an implementation of QueryPlanData used by this scorer
void	reset(QueryPlanChooser c) Initialize the scorer instance before the iteration of possible query plans
Comparable	score(QueryPlan qp) Returns a score for the query plan

Methods inherited from class java.lang.Object

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

Constructor Detail

IndexedFieldScorer

public IndexedFieldScorer()

Method Detail

newDataInstance

public QueryPlanData newDataInstance()

Description copied from interface: QueryPlanScorer

Returns a new instance for an implementation of QueryPlanData used by this scorer

Specified by:

newDataInstance in interface QueryPlanScorer

score

public Comparable score(QueryPlan qp)

Description copied from interface: QueryPlanScorer

Returns a score for the query plan

Specified by:

score in interface QueryPlanScorer

reset

public void reset(QueryPlanChooser c)

Description copied from interface: QueryPlanScorer

Initialize the scorer instance before the iteration of possible query plans

Specified by:

reset in interface QueryPlanScorer