org.objectweb.medor.eval.lib
Class TupleCollectionNodeEvaluator

java.lang.Object
  org.objectweb.medor.eval.lib.TupleCollectionNodeEvaluator

All Implemented Interfaces:

NodeEvaluator

public class TupleCollectionNodeEvaluator

extends java.lang.Object

implements NodeEvaluator

Just a simple class that encapsulates a TupleCollection.

Constructor Summary

TupleCollectionNodeEvaluator(TupleCollection tc)

Method Summary

TupleCollection	fetchData(ParameterOperand[] parameters) This method executes the query on the underlying node.
long	getCacheSize()
EvaluationMetaData	getEvaluationMetaData() Returns the evaluation meta data associated with this node evaluator.
QueryNode	getQueryNode() Returns the QueryNode to which the NodeEvaluator is attached.
boolean	linkChildren() Opens the links between the current NodeEvaluator and the NodeEvaluators of the children QueryTrees for pipelining operations.
void	setCacheSize(long cacheSize)
void	setPrefetchBuffer(PrefetchBuffer pb) Associates a PrefetchBuffer to be filled by the collection computed by this evaluator.
boolean	unlinkChildren() Closes the links between the current NodeEvaluator and the NodeEvaluators of the children QueryTrees for pipelining operations.

Methods inherited from class java.lang.Object

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

Constructor Detail

TupleCollectionNodeEvaluator

public TupleCollectionNodeEvaluator(TupleCollection tc)

Method Detail

linkChildren

public boolean linkChildren()

Description copied from interface: NodeEvaluator

Opens the links between the current NodeEvaluator and the NodeEvaluators of the children QueryTrees for pipelining operations. TODO complete comments

Specified by:

linkChildren in interface NodeEvaluator

unlinkChildren

public boolean unlinkChildren()

Description copied from interface: NodeEvaluator

Closes the links between the current NodeEvaluator and the NodeEvaluators of the children QueryTrees for pipelining operations. TODO complete comments

Specified by:

unlinkChildren in interface NodeEvaluator

fetchData

public TupleCollection fetchData(ParameterOperand[] parameters)

Description copied from interface: NodeEvaluator

This method executes the query on the underlying node. It controls the evaluation locally for this node. It returns the TupleCollection containing the result of the execution.

Specified by:

fetchData in interface NodeEvaluator

getQueryNode

public QueryNode getQueryNode()

Description copied from interface: NodeEvaluator

Returns the QueryNode to which the NodeEvaluator is attached.

Specified by:

getQueryNode in interface NodeEvaluator

getCacheSize

public long getCacheSize()

Specified by:

getCacheSize in interface NodeEvaluator

setCacheSize

public void setCacheSize(long cacheSize)

Specified by:

setCacheSize in interface NodeEvaluator

setPrefetchBuffer

public void setPrefetchBuffer(PrefetchBuffer pb)
                       throws MedorException

Description copied from interface: NodeEvaluator

Associates a PrefetchBuffer to be filled by the collection computed by this evaluator.

Specified by:

setPrefetchBuffer in interface NodeEvaluator

Parameters:

pb - The PrefetchBuffer to be filled.

Throws:

MedorException

getEvaluationMetaData

public EvaluationMetaData getEvaluationMetaData()

Description copied from interface: NodeEvaluator

Returns the evaluation meta data associated with this node evaluator.

Specified by:

getEvaluationMetaData in interface NodeEvaluator

Returns:

the associated EvaluationMetaData