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eclipse-rdf4j/rdf4j#1298 initial implementation of a rdfs reasoner fo…
…r the shacl engine Signed-off-by: Håvard Ottestad <hmottestad@gmail.com>
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131 changes: 131 additions & 0 deletions
131
shacl/src/main/java/org/eclipse/rdf4j/sail/shacl/RdfsSubClassOfReasoner.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| package org.eclipse.rdf4j.sail.shacl; | ||
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| import org.eclipse.rdf4j.common.iteration.Iterations; | ||
| import org.eclipse.rdf4j.model.Resource; | ||
| import org.eclipse.rdf4j.model.Statement; | ||
| import org.eclipse.rdf4j.model.impl.SimpleValueFactory; | ||
| import org.eclipse.rdf4j.model.vocabulary.RDF; | ||
| import org.eclipse.rdf4j.model.vocabulary.RDFS; | ||
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| import java.util.ArrayList; | ||
| import java.util.Collection; | ||
| import java.util.Collections; | ||
| import java.util.HashMap; | ||
| import java.util.HashSet; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Set; | ||
| import java.util.stream.Stream; | ||
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| public class RdfsSubClassOfReasoner { | ||
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| private final Collection<Statement> subClassOfStatements = new ArrayList<>(); | ||
| private final Collection<Resource> types = new ArrayList<>(); | ||
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| private final Map<Resource, Set<Resource>> forwardChainCache = new HashMap<>(); | ||
| private final Map<Resource, Set<Resource>> backwardsChainCache = new HashMap<>(); | ||
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| public Stream<Statement> forwardChain(Statement statement) { | ||
| SimpleValueFactory vf = SimpleValueFactory.getInstance(); | ||
| if (statement.getPredicate().equals(RDF.TYPE) && forwardChainCache.containsKey(statement.getObject())) { | ||
| return forwardChainCache.get(statement.getObject()).stream().map(r -> vf.createStatement(statement.getSubject(), RDF.TYPE, r, statement.getContext())); | ||
| } | ||
| return Stream.of(statement); | ||
| } | ||
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| public Set<Resource> backwardsChain(Resource type) { | ||
| Set<Resource> resources = backwardsChainCache.get(type); | ||
| if(resources != null){ | ||
| return resources; | ||
| } | ||
| return Collections.emptySet(); | ||
| } | ||
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| void addSubClassOfStatement(Statement st) { | ||
| subClassOfStatements.add(st); | ||
| types.add(st.getSubject()); | ||
| types.add((Resource) st.getObject()); | ||
| } | ||
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| private void calculateSubClassOf(Collection<Statement> subClassOfStatements) { | ||
| types.forEach(type -> { | ||
| if (!forwardChainCache.containsKey(type)) { | ||
| forwardChainCache.put(type, new HashSet<>()); | ||
| } | ||
| if (!backwardsChainCache.containsKey(type)) { | ||
| backwardsChainCache.put(type, new HashSet<>()); | ||
| } | ||
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| forwardChainCache.get(type).add(type); | ||
| backwardsChainCache.get(type).add(type); | ||
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| }); | ||
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| subClassOfStatements.forEach(s -> { | ||
| Resource subClass = s.getSubject(); | ||
| Resource supClass = (Resource) s.getObject(); | ||
| if (!forwardChainCache.containsKey(subClass)) { | ||
| forwardChainCache.put(subClass, new HashSet<>()); | ||
| } | ||
| if (!backwardsChainCache.containsKey(supClass)) { | ||
| backwardsChainCache.put(supClass, new HashSet<>()); | ||
| } | ||
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| forwardChainCache.get(subClass).add((Resource) s.getObject()); | ||
| backwardsChainCache.get(supClass).add((Resource) s.getSubject()); | ||
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| }); | ||
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| forwardChainUntilFixPoint(forwardChainCache); | ||
| forwardChainUntilFixPoint(backwardsChainCache); | ||
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| } | ||
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| private void forwardChainUntilFixPoint(Map<Resource, Set<Resource>> forwardChainCache) { | ||
| // Fixed point approach to finding all sub-classes. | ||
| // prevSize is the size of the previous application of the function | ||
| // newSize is the size of the current application of the function | ||
| // Fixed point is reached when they are the same. | ||
| // Eg. Two consecutive applications return the same number of subclasses | ||
| long prevSize = 0; | ||
| final long[] newSize = {-1}; | ||
| while (prevSize != newSize[0]) { | ||
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| prevSize = newSize[0]; | ||
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| newSize[0] = 0; | ||
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| forwardChainCache.forEach((key, value) -> { | ||
| List<Resource> temp = new ArrayList<>(); | ||
| value.forEach(superClass -> temp.addAll(resolveTypes(superClass, forwardChainCache))); | ||
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| value.addAll(temp); | ||
| newSize[0] += value.size(); | ||
| }); | ||
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| } | ||
| } | ||
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| private Set<Resource> resolveTypes(Resource value, Map<Resource, Set<Resource>> forwardChainCache) { | ||
| Set<Resource> iris = forwardChainCache.get(value); | ||
| return iris != null ? iris : Collections.emptySet(); | ||
| } | ||
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| static RdfsSubClassOfReasoner createReasoner(ShaclSailConnection shaclSailConnection) { | ||
| RdfsSubClassOfReasoner rdfsSubClassOfReasoner = new RdfsSubClassOfReasoner(); | ||
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| try (Stream<? extends Statement> stream = Iterations.stream(shaclSailConnection.getStatements(null, RDFS.SUBCLASSOF, null, false))) { | ||
| stream.forEach(rdfsSubClassOfReasoner::addSubClassOfStatement); | ||
| } | ||
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| rdfsSubClassOfReasoner.calculateSubClassOf(rdfsSubClassOfReasoner.subClassOfStatements); | ||
| return rdfsSubClassOfReasoner; | ||
| } | ||
| } | ||
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| /* | ||
| */ |
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