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

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

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	ApplyVocabularyMappings.Worker

Constructor Summary

Constructors

Constructor	Description
ApplyVocabularyMappings()

Method Summary

Modifier and Type	Method	Description
LogicalPlan	apply(LogicalPlan inputPlan)
LogicalPlan	apply(LogicalPlan inputPlan, QueryProcContext ctxt2)	Applies this heuristics to the given plan and returns the resulting, potentially rewritten plan.
static LogicalPlan	rewriteReqOf(SPARQLGraphPattern pattern, FederationMember fm, boolean mayReduce)	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,
 QueryProcContext ctxt2)

Description copied from interface: HeuristicForLogicalOptimization

Applies this heuristics to the given plan and returns the resulting, potentially rewritten plan.

Specified by:

apply in interface HeuristicForLogicalOptimization

apply

public LogicalPlan apply(LogicalPlan inputPlan)

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,
 boolean mayReduce)

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