Class ExtractedMappingRelation<DDS extends DataObject,DC1 extends DataObject,DC2 extends DataObject,QL1 extends Query,QL2 extends Query>

java.lang.Object

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

se.liu.ida.hefquin.mappings.algebra.exec.ExtractedMappingRelation<DDS,DC1,DC2,QL1,QL2>

All Implemented Interfaces:

MappingRelation

public class ExtractedMappingRelation<DDS extends DataObject,DC1 extends DataObject,DC2 extends DataObject,QL1 extends Query,QL2 extends Query>
extends BaseForMappingRelationImpl

A MappingRelation produced by a MappingOpExtract operator.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static class	ExtractedMappingRelation.MappingRelationCreator
protected class	ExtractedMappingRelation.MyCursor

Field Summary

Fields

Modifier and Type	Field	Description
protected MappingRelationCursor	cursor
protected final Iterable<Map.Entry<String,QL2>>	entriesOfP
protected final QL1	query
protected final SourceType<DDS,DC1,DC2,QL1,QL2>	srcType

Fields inherited from class se.liu.ida.hefquin.mappings.algebra.impl.BaseForMappingRelationImpl

schema

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

errorNode, gAttr, oAttr, pAttr, sAttr, spogAttrs

Constructor Summary

Constructors

Constructor	Description
ExtractedMappingRelation(List<String> schema, SourceType<DDS,DC1,DC2,QL1,QL2> srcType, QL1 query, Iterable<Map.Entry<String,QL2>> entriesOfP, DDS d)

Method Summary

Modifier and Type	Method	Description
protected MappingRelation	createMappingRelation(DDS d, DC1 cxtObj)
protected Map<String,org.apache.jena.graph.Node[]>	determineValuesPerAttribute(DDS d, DC1 cxtObj)	The returned map associates an array with every attribute in MappingOpExtract.getEntriesOfP().
MappingRelationCursor	getCursor()

Methods inherited from class se.liu.ida.hefquin.mappings.algebra.impl.BaseForMappingRelationImpl

getSchema

Methods inherited from class java.lang.Object

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

Field Details

srcType

protected final SourceType<DDS extends DataObject,DC1 extends DataObject,DC2 extends DataObject,QL1 extends Query,QL2 extends Query> srcType

query

protected final QL1 extends Query query

entriesOfP

protected final Iterable<Map.Entry<String,QL2 extends Query>> entriesOfP

cursor

protected MappingRelationCursor cursor

Constructor Details

ExtractedMappingRelation

public ExtractedMappingRelation(List<String> schema,
 SourceType<DDS,DC1,DC2,QL1,QL2> srcType,
 QL1 query,
 Iterable<Map.Entry<String,QL2>> entriesOfP,
 DDS d)

Method Details

getCursor

public MappingRelationCursor getCursor()

createMappingRelation

protected MappingRelation createMappingRelation(DDS d,
 DC1 cxtObj)

determineValuesPerAttribute

protected Map<String,org.apache.jena.graph.Node[]> determineValuesPerAttribute(DDS d,
 DC1 cxtObj)

The returned map associates an array with every attribute in MappingOpExtract.getEntriesOfP(). For every attribute, this array contains the values that have been determined by evaluating the corresponding query of the attribute in the context of the given context object (where the corresponding query of an attribute is the query in the same entry of MappingOpExtract.getEntriesOfP()). If there is an attribute for which the corresponding query has the empty result (i.e., no values), then this function returns null.