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The core ELK Reasoner package
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package org.semanticweb.elk.reasoner.proof;
import java.util.Arrays;
/*-
* #%L
* ELK Reasoner Core
* $Id:$
* $HeadURL:$
* %%
* Copyright (C) 2011 - 2024 Department of Computer Science, University of Oxford
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
import java.util.Collection;
import java.util.Collections;
/**
* An object from which one can retrieve inferences deriving conclusions.
*
* @author Yevgeny Kazakov
*
* @param
* the type of inferences maintained by this proof
*/
public interface ReasonerProof> {
/**
* @param conclusion
* the conclusion for which to retrieve the inferences
* @return the inferences from this proof that derive the given conclusion
*/
Collection getInferences(Object conclusion);
static class Empty>
implements ReasonerProof {
@Override
public Collection getInferences(Object conclusion) {
return Collections.emptyList();
}
}
static ReasonerProof> EMPTY_ = new Empty<>();
/**
* @return a {@link ReasonerProof} the empty set of inferences for every
* conclusion.
*
* @param
* the type of inferences used in this proof
*/
@SuppressWarnings("unchecked")
public static > ReasonerProof empty() {
return (ReasonerProof) Empty.EMPTY_;
}
/**
* @param
* the type of inferences provided by this proof
* @param proofs
* the {@link ReasonerProof}s to be combined
*
* @return the proof consisting of all inferences of the given proofs.
*/
public static > ReasonerProof union(
final Iterable> proofs) {
return new ReasonerProofUnion(proofs);
}
/**
* @param
* the type of inferences provided by this proof
* @param proofs
* the {@link ReasonerProof}s to be combined
*
* @return the proof consisting of all inferences of the given proofs.
*/
@SafeVarargs
public static > ReasonerProof union(
ReasonerProof... proofs) {
return new ReasonerProofUnion(Arrays.asList(proofs));
}
}