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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, 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.util;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.semanticweb.owlapi.model.AddAxiom;
import org.semanticweb.owlapi.model.IRI;
import org.semanticweb.owlapi.model.OWLAxiom;
import org.semanticweb.owlapi.model.OWLClass;
import org.semanticweb.owlapi.model.OWLDataProperty;
import org.semanticweb.owlapi.model.OWLEntity;
import org.semanticweb.owlapi.model.OWLNamedIndividual;
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;

/**
 * Performs a bulk conversion/translation of entity URIs. This utility class can
 * be used to replace entity names with IDs for example. The entity converter is
 * supplied with a set of ontologies and a conversion strategy. All of the
 * entities that are referenced in the specified ontologies will have their URIs
 * converted according the specified conversion strategy.
 * 
 * @author Matthew Horridge, The University Of Manchester, Bio-Health
 *         Informatics Group, Date: 25-Nov-2007
 */
public class OWLEntityURIConverter {

    private final OWLOntologyManager manager;
    // The ontologies that reference the
    // entities whose names will be converted
    private final Collection ontologies;
    private Map replacementMap;
    private List changes;
    private Set processedEntities;
    private final OWLEntityURIConverterStrategy strategy;

    /**
     * Creates a converter that will convert the URIs of entities in the
     * specified ontologies using the specified conversion strategy.
     * 
     * @param manager
     *        The manager which managers the specified ontologies.
     * @param ontologies
     *        The ontologies whose entity URIs will be converted
     * @param strategy
     *        The conversion strategy to be used.
     */
    public OWLEntityURIConverter(OWLOntologyManager manager,
            Set ontologies, OWLEntityURIConverterStrategy strategy) {
        this.manager = manager;
        this.ontologies = new ArrayList(ontologies);
        this.strategy = strategy;
    }

    /**
     * Gets the changes required to perform the conversion.
     * 
     * @return A list of ontology changes that should be applied in order to
     *         convert the URI of entities in the specified ontologies.
     */
    public List getChanges() {
        replacementMap = new HashMap();
        processedEntities = new HashSet();
        changes = new ArrayList();
        for (OWLOntology ont : ontologies) {
            for (OWLClass cls : ont.getClassesInSignature()) {
                if (!cls.isOWLThing() && !cls.isOWLNothing()) {
                    processEntity(cls);
                }
            }
            for (OWLObjectProperty prop : ont.getObjectPropertiesInSignature()) {
                processEntity(prop);
            }
            for (OWLDataProperty prop : ont.getDataPropertiesInSignature()) {
                processEntity(prop);
            }
            for (OWLNamedIndividual ind : ont.getIndividualsInSignature()) {
                processEntity(ind);
            }
        }
        OWLObjectDuplicator dup = new OWLObjectDuplicator(replacementMap,
                manager.getOWLDataFactory());
        for (OWLOntology ont : ontologies) {
            for (OWLAxiom ax : ont.getAxioms()) {
                OWLAxiom dupAx = dup.duplicateObject(ax);
                if (!dupAx.equals(ax)) {
                    changes.add(new RemoveAxiom(ont, ax));
                    changes.add(new AddAxiom(ont, dupAx));
                }
            }
        }
        return changes;
    }

    private void processEntity(OWLEntity ent) {
        if (processedEntities.contains(ent)) {
            return;
        }
        // Add label?
        IRI rep = getTinyURI(ent);
        replacementMap.put(ent, rep);
        processedEntities.add(ent);
    }

    private IRI getTinyURI(OWLEntity ent) {
        return strategy.getConvertedIRI(ent);
    }
}




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