Package se.liu.ida.hefquin.engine.queryproc.impl.loptimizer

Class ApplyVocabularyMappings

java.lang.Object

se.liu.ida.hefquin.engine.queryproc.impl.loptimizer.ApplyVocabularyMappings

All Implemented Interfaces:

HeuristicForLogicalOptimization

public class ApplyVocabularyMappings
extends Object
implements HeuristicForLogicalOptimization

Constructor Summary

Constructors

Constructor	Description
ApplyVocabularyMappings()

Method Summary

Modifier and Type	Method	Description
LogicalPlan	apply(LogicalPlan inputPlan)	Rewrites an initial logical plan into a second plan which incorporates translations of local to global vocabulary and request-operator rewriting.
static LogicalPlan	rewriteReqOf(SPARQLGraphPattern pattern, FederationMember fm)	Creates a logical plan where all requests are TriplePatternRequests for use when a federation member's interface is a TPF-server.
static LogicalPlan	rewriteToUseLocalVocabulary(LogicalPlan inputPlan)	Rewrites the given logical plan with a request operator as root into a logical plan that uses the local vocabulary of the federation member of the request.

Methods inherited from class java.lang.Object

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

Constructor Details

ApplyVocabularyMappings

public ApplyVocabularyMappings()

Method Details

apply

public LogicalPlan apply(LogicalPlan inputPlan)

Rewrites an initial logical plan into a second plan which incorporates translations of local to global vocabulary and request-operator rewriting. This method implements the rewriteLogPlan pseudocode of Helgesson's B.Sc thesis.

Specified by:

apply in interface HeuristicForLogicalOptimization

rewriteToUseLocalVocabulary

public static LogicalPlan rewriteToUseLocalVocabulary(LogicalPlan inputPlan)

Rewrites the given logical plan with a request operator as root into a logical plan that uses the local vocabulary of the federation member of the request.

rewriteReqOf

public static LogicalPlan rewriteReqOf(SPARQLGraphPattern pattern,
 FederationMember fm)

Creates a logical plan where all requests are TriplePatternRequests for use when a federation member's interface is a TPF-server.