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package org.semanticweb.owlapi.util;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.semanticweb.owlapi.model.OWLAnonymousIndividual;
import org.semanticweb.owlapi.model.OWLDataFactory;
import org.semanticweb.owlapi.model.OWLOntologyManager;
import org.semanticweb.owlapi.model.OntologyConfigurator;
import org.semanticweb.owlapi.model.providers.AnonymousIndividualByIdProvider;

/**
 * A provider for anonymous individuals that remaps input ids consistently across all requests. This
 * class obeys the preferences set in {@link OWLOntologyManager#getOntologyWriterConfiguration()}.
 */
public class RemappingIndividualProvider implements AnonymousIndividualByIdProvider {

    private OWLDataFactory df;
    private boolean shouldRemapAllAnonymousIndividualsIds;
    private Map map;

    /**
     * @param m ontology configurator
     * @param df data factory
     */
    public RemappingIndividualProvider(OntologyConfigurator m, OWLDataFactory df) {
        this(m.buildWriterConfiguration().shouldRemapAllAnonymousIndividualsIds(), df);
    }

    /**
     * @param remap enable remap
     * @param df data factory
     */
    public RemappingIndividualProvider(boolean remap, OWLDataFactory df) {
        this.df = df;
        shouldRemapAllAnonymousIndividualsIds = remap;
        if (shouldRemapAllAnonymousIndividualsIds) {
            map = new HashMap<>();
        } else {
            map = Collections.emptyMap();
        }
    }

    @Override
    public OWLAnonymousIndividual getOWLAnonymousIndividual(String nodeId) {
        if (!shouldRemapAllAnonymousIndividualsIds) {
            return df.getOWLAnonymousIndividual(nodeId);
        }
        OWLAnonymousIndividual toReturn = map.get(nodeId);
        if (toReturn == null) {
            toReturn = df.getOWLAnonymousIndividual();
            map.put(nodeId, toReturn);
        }
        return toReturn;
    }
}