Class MappingOpConstant

java.lang.Object

se.liu.ida.hefquin.mappings.algebra.ops.BaseForMappingOperator

se.liu.ida.hefquin.mappings.algebra.ops.MappingOpConstant

All Implemented Interfaces:

MappingOperator

public class MappingOpConstant
extends BaseForMappingOperator

This operator simply returns the tuples given to its constructor.

Field Summary

Fields

Modifier and Type	Field	Description
protected final MappingRelation	r

Fields inherited from class se.liu.ida.hefquin.mappings.algebra.ops.BaseForMappingOperator

id

Constructor Summary

Constructors

Constructor	Description
MappingOpConstant(MappingRelation r)

Method Summary

Modifier and Type	Method	Description
MappingRelation	evaluate(Map<SourceReference,DataObject> srMap)
Set<String>	getSchema()
boolean	isValid()
boolean	isValidInput(Map<SourceReference,DataObject> srMap)
void	visit(MappingOperatorVisitor visitor)

Methods inherited from class se.liu.ida.hefquin.mappings.algebra.ops.BaseForMappingOperator

getID

Methods inherited from class java.lang.Object

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

Field Details

r

protected final MappingRelation r

Constructor Details

MappingOpConstant

public MappingOpConstant(MappingRelation r)

Method Details

getSchema

public Set<String> getSchema()

isValid

public boolean isValid()

visit

public void visit(MappingOperatorVisitor visitor)

isValidInput

public boolean isValidInput(Map<SourceReference,DataObject> srMap)

evaluate

public MappingRelation evaluate(Map<SourceReference,DataObject> srMap)