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/*
* This file is part of the OWL API.
*
* The contents of this file are subject to the LGPL License, Version 3.0.
*
* Copyright (C) 2011, The University of Manchester
*
* 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.
*
* 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/.
*
*
* Alternatively, the contents of this file may be used under the terms of the Apache License, Version 2.0
* in which case, the provisions of the Apache License Version 2.0 are applicable instead of those above.
*
* Copyright 2011, The University of Manchester
*
* 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.
*/
package org.semanticweb.owlapi.debugging;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.semanticweb.owlapi.model.AddAxiom;
import org.semanticweb.owlapi.model.IRI;
import org.semanticweb.owlapi.model.OWLAnnotationAxiom;
import org.semanticweb.owlapi.model.OWLAxiom;
import org.semanticweb.owlapi.model.OWLClass;
import org.semanticweb.owlapi.model.OWLClassExpression;
import org.semanticweb.owlapi.model.OWLDataFactory;
import org.semanticweb.owlapi.model.OWLDataProperty;
import org.semanticweb.owlapi.model.OWLEntity;
import org.semanticweb.owlapi.model.OWLException;
import org.semanticweb.owlapi.model.OWLIndividual;
import org.semanticweb.owlapi.model.OWLObjectProperty;
import org.semanticweb.owlapi.model.OWLOntology;
import org.semanticweb.owlapi.model.OWLOntologyChange;
import org.semanticweb.owlapi.model.OWLOntologyManager;
import org.semanticweb.owlapi.model.RemoveAxiom;
import org.semanticweb.owlapi.reasoner.OWLReasoner;
import org.semanticweb.owlapi.reasoner.OWLReasonerFactory;
import org.semanticweb.owlapi.util.SimpleIRIMapper;
/** Author: Matthew Horridge
* The University Of Manchester
* Bio-Health Informatics Group
* Date: 24-Nov-2006
*
*
* This is an implementation of a blackbox debugger. The implementation is based
* on the description of a black box debugger as described in Aditya Kalyanpur's
* PhD Thesis : "Debugging and Repair of OWL Ontologies". */
public class BlackBoxOWLDebugger extends AbstractOWLDebugger {
private static final Logger logger = Logger.getLogger(BlackBoxOWLDebugger.class
.getName());
private final OWLOntologyManager owlOntologyManager;
private OWLClass currentClass;
private OWLOntology debuggingOntology;
private final Set debuggingAxioms;
private final Set objectsExpandedWithDefiningAxioms;
private final Set objectsExpandedWithReferencingAxioms;
private final Set expandedWithDefiningAxioms;
private final Set expandedWithReferencingAxioms;
private final OWLReasonerFactory reasonerFactory;
private final Set temporaryAxioms;
private final Map expandedAxiomMap;
/** default expansion limit */
public static final int DEFAULT_INITIAL_EXPANSION_LIMIT = 50;
private int initialExpansionLimit = DEFAULT_INITIAL_EXPANSION_LIMIT;
private int expansionLimit = initialExpansionLimit;
private double expansionFactor = 1.25;
private static final int DEFAULT_FAST_PRUNING_WINDOW_SIZE = 10;
private int fastPruningWindowSize = 0;
private boolean performRepeatedFastPruning = false;
/** @param owlOntologyManager
* manager to use
* @param ontology
* ontology to debug
* @param reasonerFactory
* factory to use */
public BlackBoxOWLDebugger(OWLOntologyManager owlOntologyManager,
OWLOntology ontology, OWLReasonerFactory reasonerFactory) {
super(owlOntologyManager, ontology);
this.reasonerFactory = reasonerFactory;
this.owlOntologyManager = owlOntologyManager;
debuggingAxioms = new LinkedHashSet();
objectsExpandedWithDefiningAxioms = new HashSet();
objectsExpandedWithReferencingAxioms = new HashSet();
expandedWithDefiningAxioms = new HashSet();
expandedWithReferencingAxioms = new HashSet();
temporaryAxioms = new HashSet();
expandedAxiomMap = new HashMap();
logger.setLevel(Level.INFO);
}
@Override
public void dispose() {
reset();
}
private void reset() {
currentClass = null;
debuggingOntology = null;
debuggingAxioms.clear();
objectsExpandedWithDefiningAxioms.clear();
objectsExpandedWithReferencingAxioms.clear();
expandedWithDefiningAxioms.clear();
expandedWithReferencingAxioms.clear();
temporaryAxioms.clear();
expandedAxiomMap.clear();
expansionLimit = initialExpansionLimit;
}
@Override
protected OWLClassExpression getCurrentClass() throws OWLException {
return currentClass;
}
private OWLClass setupDebuggingClass(OWLClassExpression cls) throws OWLException {
if (!cls.isAnonymous()) {
return (OWLClass) cls;
} else {
// The class is anonymous, so we need to assign it a name
OWLClass curCls = owlOntologyManager.getOWLDataFactory().getOWLClass(
createIRI());
Set operands = new HashSet();
operands.add(curCls);
operands.add(cls);
temporaryAxioms.add(owlOntologyManager.getOWLDataFactory()
.getOWLEquivalentClassesAxiom(operands));
for (OWLAxiom ax : temporaryAxioms) {
owlOntologyManager.applyChanges(Arrays.asList(new AddAxiom(
getOWLOntology(), ax)));
}
return curCls;
}
}
@Override
public Set getSOSForIncosistentClass(OWLClassExpression cls)
throws OWLException {
reset();
currentClass = setupDebuggingClass(cls);
generateSOSAxioms();
for (OWLAxiom ax : temporaryAxioms) {
owlOntologyManager.applyChanges(Arrays.asList(new RemoveAxiom(
getOWLOntology(), ax)));
}
debuggingAxioms.removeAll(temporaryAxioms);
return new HashSet(debuggingAxioms);
}
// /////////////////////////////////////////////////////////////////////////////////////////
//
// Expansion
//
// /////////////////////////////////////////////////////////////////////////////////////////
private int expandAxioms() throws OWLException {
// We expand the axiom set using axioms that define entities that are
// already
// referenced in the existing set of axioms. If this fails to expand the
// axiom
// set we expand using axioms that reference the entities in the axioms
// that have
// already been expanded.
// Keep track of the number of axioms that have been added
int axiomsAdded = 0;
int remainingSpace = expansionLimit;
for (OWLAxiom ax : new ArrayList(debuggingAxioms)) {
if (expandedWithDefiningAxioms.contains(ax)) {
// Skip if already done
continue;
}
// Collect the entities that have been used in the axiom
for (OWLEntity curObj : ax.getSignature()) {
if (!objectsExpandedWithDefiningAxioms.contains(curObj)) {
int added = expandWithDefiningAxioms(curObj, remainingSpace);
axiomsAdded += added;
remainingSpace = remainingSpace - added;
if (remainingSpace == 0) {
expansionLimit *= expansionFactor;
return axiomsAdded;
}
// Flag that we have completely expanded all defining axioms
// for this particular entity
objectsExpandedWithDefiningAxioms.add(curObj);
}
}
// Flag that we've completely expanded this particular axiom
expandedWithDefiningAxioms.add(ax);
}
if (axiomsAdded > 0) {
return axiomsAdded;
}
// No axioms added at this point. Start adding axioms that reference
// entities contained in the current set of debugging axioms
for (OWLAxiom ax : new ArrayList(debuggingAxioms)) {
if (expandedWithReferencingAxioms.contains(ax)) {
// Skip - already done this one
continue;
}
// Keep track of the number of axioms that have been added
for (OWLEntity curObj : ax.getSignature()) {
if (!objectsExpandedWithReferencingAxioms.contains(curObj)) {
int added = expandWithReferencingAxioms(curObj, expansionLimit);
axiomsAdded += added;
remainingSpace -= added;
if (remainingSpace == 0) {
expansionLimit *= expansionFactor;
return axiomsAdded;
}
objectsExpandedWithReferencingAxioms.add(curObj);
}
}
expandedWithReferencingAxioms.add(ax);
}
return axiomsAdded;
}
/** Creates a set of axioms to expands the debugging axiom set by adding the
* defining axioms for the specified entity. */
private int expandWithDefiningAxioms(OWLEntity obj, int limit) throws OWLException {
Set expansionAxioms = new HashSet();
for (OWLOntology ont : owlOntologyManager.getImportsClosure(getOWLOntology())) {
if (obj instanceof OWLClass) {
expansionAxioms.addAll(ont.getAxioms((OWLClass) obj));
} else if (obj instanceof OWLObjectProperty) {
expansionAxioms.addAll(ont.getAxioms((OWLObjectProperty) obj));
} else if (obj instanceof OWLDataProperty) {
expansionAxioms.addAll(ont.getAxioms((OWLDataProperty) obj));
} else if (obj instanceof OWLIndividual) {
expansionAxioms.addAll(ont.getAxioms((OWLIndividual) obj));
}
}
expansionAxioms.removeAll(debuggingAxioms);
return addMax(expansionAxioms, debuggingAxioms, limit);
}
/** Expands the axiom set by adding the referencing axioms for the specified
* entity. */
private int expandWithReferencingAxioms(OWLEntity obj, int limit) throws OWLException {
Set expansionAxioms = new HashSet();
// First expand by getting the defining axioms - if this doesn't
// return any axioms, then get the axioms that reference the entity
for (OWLOntology ont : owlOntologyManager.getImportsClosure(getOWLOntology())) {
expansionAxioms.addAll(ont.getReferencingAxioms(obj));
}
expansionAxioms.removeAll(debuggingAxioms);
return addMax(expansionAxioms, debuggingAxioms, limit);
}
/** A utility method. Adds axioms from one set to another set upto a
* specified limit. Annotation axioms are stripped out
*
* @param source
* The source set. Objects from this set will be added to the
* destination set
* @param dest
* The destination set. Objects will be added to this set
* @param limit
* The maximum number of objects to be added.
* @return The number of objects that were actuall added. */
private static int addMax(Set source, Set dest, int limit) {
int count = 0;
for (N obj : source) {
if (count == limit) {
break;
}
if (!(obj instanceof OWLAnnotationAxiom)) {
if (dest.add(obj)) {
count++;
}
}
}
return count;
}
// /////////////////////////////////////////////////////////////////////////////////////////
//
// Contraction/Pruning - Fast pruning is performed and then slow pruning is
// performed.
//
// /////////////////////////////////////////////////////////////////////////////////////////
private void performFastPruning() throws OWLException {
logger.setLevel(Level.INFO);
Set axiomWindow = new HashSet();
Object[] axioms = debuggingAxioms.toArray();
if (logger.isLoggable(Level.INFO)) {
logger.info("Fast pruning: ");
}
if (logger.isLoggable(Level.INFO)) {
logger.info(" - Window size: " + fastPruningWindowSize);
}
int windowCount = debuggingAxioms.size() / fastPruningWindowSize;
for (int currentWindow = 0; currentWindow < windowCount; currentWindow++) {
axiomWindow.clear();
int startIndex = currentWindow * fastPruningWindowSize;
int endIndex = startIndex + fastPruningWindowSize;
for (int axiomIndex = startIndex; axiomIndex < endIndex; axiomIndex++) {
OWLAxiom currentAxiom = (OWLAxiom) axioms[axiomIndex];
axiomWindow.add(currentAxiom);
debuggingAxioms.remove(currentAxiom);
}
if (isSatisfiable()) {
debuggingAxioms.addAll(axiomWindow);
}
}
// Add any left over axioms
axiomWindow.clear();
int remainingAxiomsCount = debuggingAxioms.size() % fastPruningWindowSize;
if (remainingAxiomsCount > 0) {
int fragmentIndex = windowCount * fastPruningWindowSize;
while (fragmentIndex < axioms.length) {
OWLAxiom curAxiom = (OWLAxiom) axioms[fragmentIndex];
axiomWindow.add(curAxiom);
debuggingAxioms.remove(curAxiom);
fragmentIndex++;
}
if (isSatisfiable()) {
debuggingAxioms.addAll(axiomWindow);
}
}
if (logger.isLoggable(Level.INFO)) {
logger.info(" - End of fast pruning");
}
}
private void performSlowPruning() throws OWLException {
// Simply remove axioms one at a time. If the class
// being debugged turns satisfiable then we know we have
// an SOS axoiom.
List axiomsCopy = new ArrayList(debuggingAxioms);
for (OWLAxiom ax : axiomsCopy) {
debuggingAxioms.remove(ax);
if (isSatisfiable()) {
// Affects satisfiability, so add back in
debuggingAxioms.add(ax);
}
}
}
// //////////////////////////////////////////////////////////////////////////////////////////
//
// Creation of debugging ontology and satisfiability testing
//
// /////////////////////////////////////////////////////////////////////////////////////////
private int satTestCount = 0;
/** Tests the satisfiability of the test class. The ontology is recreated
* before the test is performed. */
private boolean isSatisfiable() throws OWLException {
createDebuggingOntology();
OWLReasoner reasoner = reasonerFactory
.createNonBufferingReasoner(debuggingOntology);
satTestCount++;
boolean sat = reasoner.isSatisfiable(currentClass);
reasoner.dispose();
return sat;
}
private void createDebuggingOntology() throws OWLException {
if (debuggingOntology != null) {
owlOntologyManager.removeOntology(debuggingOntology);
}
IRI iri = createIRI();
SimpleIRIMapper mapper = new SimpleIRIMapper(iri, iri);
owlOntologyManager.addIRIMapper(mapper);
debuggingOntology = owlOntologyManager.createOntology(iri);
owlOntologyManager.removeIRIMapper(mapper);
List changes = new ArrayList();
for (OWLAxiom ax : debuggingAxioms) {
changes.add(new AddAxiom(debuggingOntology, ax));
}
for (OWLAxiom ax : temporaryAxioms) {
changes.add(new AddAxiom(debuggingOntology, ax));
}
// Ensure the ontology contains the signature of the class which is
// being debugged
OWLDataFactory factory = owlOntologyManager.getOWLDataFactory();
OWLAxiom ax = factory.getOWLSubClassOfAxiom(currentClass, factory.getOWLThing());
changes.add(new AddAxiom(debuggingOntology, ax));
owlOntologyManager.applyChanges(changes);
}
private void resetSatisfiabilityTestCounter() {
satTestCount = 0;
}
private void generateSOSAxioms() throws OWLException {
// Perform the initial expansion - this will cause
// the debugging axioms set to be expanded to the
// defining axioms for the class being debugged
resetSatisfiabilityTestCounter();
expandWithDefiningAxioms(currentClass, expansionLimit);
if (logger.isLoggable(Level.INFO)) {
logger.info("Initial axiom count: " + debuggingAxioms.size());
}
int totalAdded = 0;
int expansionCount = 0;
while (isSatisfiable()) {
if (logger.isLoggable(Level.INFO)) {
logger.info("Expanding axioms (expansion " + expansionCount + ")");
}
expansionCount++;
int numberAdded = expandAxioms();
totalAdded += numberAdded;
if (logger.isLoggable(Level.INFO)) {
logger.info(" ... expanded by " + numberAdded);
}
if (numberAdded == 0) {
if (logger.isLoggable(Level.INFO)) {
logger.info("ERROR! Cannot find SOS axioms!");
}
debuggingAxioms.clear();
return;
}
}
if (logger.isLoggable(Level.INFO)) {
logger.info("Total number of axioms added: " + totalAdded);
}
if (logger.isLoggable(Level.INFO)) {
logger.info("FOUND CLASH! Prunning " + debuggingAxioms.size() + " axioms...");
}
resetSatisfiabilityTestCounter();
if (logger.isLoggable(Level.INFO)) {
logger.info("Fast pruning...");
}
if (performRepeatedFastPruning) {
// Base the initial fast pruning window size on the number of axioms
fastPruningWindowSize = debuggingAxioms.size() / 10;
if (fastPruningWindowSize < DEFAULT_FAST_PRUNING_WINDOW_SIZE) {
fastPruningWindowSize = DEFAULT_FAST_PRUNING_WINDOW_SIZE;
}
if (logger.isLoggable(Level.INFO)) {
logger.info(" Initial fast prunung window size: "
+ fastPruningWindowSize);
}
int fastPruningCounter = 0;
while (fastPruningWindowSize != 1) {
if (logger.isLoggable(Level.INFO)) {
logger.info(" Round: " + fastPruningCounter
+ " (axioms to prune: " + debuggingAxioms.size() + ")");
}
fastPruningCounter++;
performFastPruning();
fastPruningWindowSize = fastPruningWindowSize / 3;
if (fastPruningWindowSize < 1) {
fastPruningWindowSize = 1;
}
}
if (logger.isLoggable(Level.INFO)) {
logger.info("... end of fast pruning. Axioms remaining: "
+ debuggingAxioms.size());
logger.info("Performed " + satTestCount
+ " satisfiability tests during fast pruning");
}
} else {
fastPruningWindowSize = DEFAULT_FAST_PRUNING_WINDOW_SIZE;
performFastPruning();
if (logger.isLoggable(Level.INFO)) {
logger.info("... end of fast pruning. Axioms remaining: "
+ debuggingAxioms.size());
logger.info("Performed " + satTestCount
+ " satisfiability tests during fast pruning");
}
}
int totalSatTests = satTestCount;
resetSatisfiabilityTestCounter();
if (logger.isLoggable(Level.INFO)) {
logger.info("Slow pruning...");
}
performSlowPruning();
if (logger.isLoggable(Level.INFO)) {
logger.info("... end of slow pruning");
logger.info("Performed " + satTestCount
+ " satisfiability tests during slow pruning");
}
totalSatTests += satTestCount;
if (logger.isLoggable(Level.INFO)) {
logger.info("Total number of satisfiability tests performed: "
+ totalSatTests);
}
}
private static IRI createIRI() {
return IRI.create("http://debugging.blackbox#", "A" + System.nanoTime());
}
}
