com.redhat.lightblue.assoc.iterators

Class BruteForceQueryPlanIterator

java.lang.Object

com.redhat.lightblue.assoc.iterators.BruteForceQueryPlanIterator

All Implemented Interfaces:

QueryPlanIterator, Serializable

public class BruteForceQueryPlanIterator
extends Object
implements QueryPlanIterator, Serializable

Iterates over possible query plans by rearranging the query plan graph. The given query plan is taken as an initial state. Every successive call to next will modify the query plan into a unique tree. Once all possible query plans are iterated, next returns false.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
BruteForceQueryPlanIterator()

Method Summary

Methods

Modifier and Type	Method and Description
boolean	next() Modifies the query plan into a unique tree.
void	reset(QueryPlan qp) Construct a query plan iterator that operates on the given query plan
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

BruteForceQueryPlanIterator

public BruteForceQueryPlanIterator()

Method Detail

reset

public void reset(QueryPlan qp)

Construct a query plan iterator that operates on the given query plan

Specified by:

reset in interface QueryPlanIterator

next

public boolean next()

Modifies the query plan into a unique tree.

Specified by:

next in interface QueryPlanIterator

Returns:

If true, the query plan is configured into a unique tree. If false, query plan is now returned back to its original state during iterator construction, and the iteration is expected to stop.

toString

public String toString()

Overrides:

toString in class Object