Class BaseForMappingRelationImpl

java.lang.Object

se.liu.ida.hefquin.mappings.algebra.impl.BaseForMappingRelationImpl

All Implemented Interfaces:

MappingRelation

Direct Known Subclasses:

ExtendedMappingRelation, ExtractedMappingRelation, MappingRelationImplWithColumnLayout, MappingRelationImplWithoutTuples, MappingRelationImplWithTupleLayout, ProjectedMappingRelation, UnionedMappingRelation

public abstract class BaseForMappingRelationImpl
extends Object
implements MappingRelation

Field Summary

Fields

Modifier and Type	Field	Description
protected final List<String>	schema

Fields inherited from interface se.liu.ida.hefquin.mappings.algebra.MappingRelation

errorNode, gAttr, oAttr, pAttr, sAttr, spogAttrs

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	BaseForMappingRelationImpl(String[] schema)
protected	BaseForMappingRelationImpl(List<String> schema)

Method Summary

Modifier and Type	Method	Description
List<String>	getSchema()	Returns the set of attributes for which the tuples in this relation have values.

Methods inherited from class java.lang.Object

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

Methods inherited from interface se.liu.ida.hefquin.mappings.algebra.MappingRelation

getCursor

Field Details

schema

protected final List<String> schema

Constructor Details

BaseForMappingRelationImpl

protected BaseForMappingRelationImpl(String[] schema)

BaseForMappingRelationImpl

protected BaseForMappingRelationImpl(List<String> schema)

Method Details

getSchema

public List<String> getSchema()

Description copied from interface: MappingRelation

Returns the set of attributes for which the tuples in this relation have values. The returned list can be assumed to be duplicate free.

The order of the attributes in the returned list is relevant when accessing the values of the tuples via a cursor for this relation (see MappingRelationCursor.getValueOfCurrentTuple(int)).

Specified by:

getSchema in interface MappingRelation