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EpistemicAxiomRemover.java
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EpistemicAxiomRemover.java
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/**
* Copyright (C) 2020 Czech Technical University in Prague
* <p>
* This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later
* version.
* <p>
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.ontodriver.jena;
import cz.cvut.kbss.ontodriver.descriptor.AbstractAxiomDescriptor;
import cz.cvut.kbss.ontodriver.jena.connector.StorageConnector;
import cz.cvut.kbss.ontodriver.jena.util.JenaUtils;
import cz.cvut.kbss.ontodriver.model.Assertion;
import cz.cvut.kbss.ontodriver.model.NamedResource;
import cz.cvut.kbss.ontodriver.model.Value;
import org.apache.jena.rdf.model.Property;
import org.apache.jena.rdf.model.Resource;
import org.apache.jena.rdf.model.ResourceFactory;
import java.net.URI;
import java.util.Map;
import java.util.Set;
/**
* This class performs an epistemic removal of statements.
* <p/>
* Epistemic remove means that only information known to the application is deleted. The assertions in the descriptor
* represent this information. Thus, only statements representing these properties are removed from the ontology. Note
* that if the descriptor contains an unspecified property assertion, all property assertions related to the subject
* individual are removed from the property's context.
*/
class EpistemicAxiomRemover {
private final StorageConnector connector;
EpistemicAxiomRemover(StorageConnector connector) {
this.connector = connector;
}
/**
* Removes statements corresponding to the subject and properties specified by the descriptor.
*
* @param descriptor Descriptor of statements to remove
*/
void remove(AbstractAxiomDescriptor descriptor) {
final Resource subject = ResourceFactory.createResource(descriptor.getSubject().getIdentifier().toString());
descriptor.getAssertions().stream().filter(a -> !a.isInferred()).forEach(assertion -> {
final Property property = ResourceFactory.createProperty(assertion.getIdentifier().toString());
if (descriptor.getAssertionContexts(assertion).isEmpty()) {
connector.remove(subject, property, null, null);
}
descriptor.getAssertionContexts(assertion)
.forEach(context -> connector.remove(subject, property, null, context.toString()));
});
}
/**
* Removes statements corresponding to the specified values.
* <p>
* This version removes precisely statements whose subject, property and object match the specified data.
*
* @param subject Statement subject
* @param properties Assertions to values
* @param context Context from which to remove the statements
*/
void remove(NamedResource subject, Map<Assertion, Set<Value<?>>> properties, URI context) {
final Resource resource = ResourceFactory.createResource(subject.getIdentifier().toString());
if (context != null) {
final String strCtx = context.toString();
properties.forEach((assertion, values) -> {
final Property property = ResourceFactory.createProperty(assertion.getIdentifier().toString());
values.forEach(value -> connector
.remove(resource, property, JenaUtils.valueToRdfNode(assertion, value), strCtx));
});
} else {
properties.forEach((assertion, values) -> {
final Property property = ResourceFactory.createProperty(assertion.getIdentifier().toString());
values.forEach(
value -> connector
.remove(resource, property, JenaUtils.valueToRdfNode(assertion, value), null));
});
}
}
}