Class MappingOpProject

java.lang.Object

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

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

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

All Implemented Interfaces:

MappingOperator

public class MappingOpProject
extends BaseForUnaryMappingOperator

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	MappingOpProject.MyCursor
protected class	MappingOpProject.MyMappingRelation

Field Summary

Fields

Modifier and Type	Field	Description
protected final Set<String>	P
protected final Set<String>	schema
protected final boolean	valid

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

subOp

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

id

Constructor Summary

Constructors

Constructor	Description
MappingOpProject(MappingOperator subOp, Set<String> P)

Method Summary

Modifier and Type	Method	Description
protected MappingRelation	createOutputRelation(MappingRelationImplWithColumnLayout input)	Creates the output relation by simply re-using the relevant columns of the given input relation.
static MappingOpProject	createWithSPOG(MappingOperator subOp)
MappingRelation	evaluate(Map<SourceReference,DataObject> srMap)
Iterable<String>	getP()
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.BaseForUnaryMappingOperator

getSubOp

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

P

protected final Set<String> P

schema

protected final Set<String> schema

valid

protected final boolean valid

Constructor Details

MappingOpProject

public MappingOpProject(MappingOperator subOp,
 Set<String> P)

Method Details

createWithSPOG

public static MappingOpProject createWithSPOG(MappingOperator subOp)

getP

public Iterable<String> getP()

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)

createOutputRelation

protected MappingRelation createOutputRelation(MappingRelationImplWithColumnLayout input)

Creates the output relation by simply re-using the relevant columns of the given input relation.