com.clarkparsia.pellet.sparqldl.engine

Class QueryPlan

java.lang.Object

com.clarkparsia.pellet.sparqldl.engine.QueryPlan

Direct Known Subclasses:

CostBasedQueryPlanNew, IncrementalQueryPlan, NoReorderingQueryPlan

public abstract class QueryPlan
extends Object

Title: Query Plan abstraction.

Description:

Copyright: Copyright (c) 2007

Company: Clark & Parsia, LLC.

Author:

Petr Kremen

Field Summary

Fields

Modifier and Type	Field and Description
protected Query	query

Constructor Summary

Constructors

Constructor and Description
QueryPlan(Query query)

Method Summary

Modifier and Type	Method and Description
abstract void	back() Goes one level back to the last atom.
Query	getQuery()
abstract boolean	hasNext() Checks whether there is another atom to execute.
abstract QueryAtom	next(ResultBinding binding) Returns next atom to be executed w.r.
abstract void	reset() Resets the query planner.

Methods inherited from class java.lang.Object

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

Field Detail

query

protected Query query

Constructor Detail

QueryPlan

public QueryPlan(Query query)

Method Detail

getQuery

public Query getQuery()

next

public abstract QueryAtom next(ResultBinding binding)

Returns next atom to be executed w.r. to the current binding.

Parameters:

binding -

Returns:

back

public abstract void back()

Goes one level back to the last atom.

hasNext

public abstract boolean hasNext()

Checks whether there is another atom to execute.

Returns:

true if there is another atom to execute.

reset

public abstract void reset()

Resets the query planner.