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package org.semanticweb.owlapi.search;

import static org.semanticweb.owlapi.util.OWLAPIStreamUtils.empty;

import java.util.stream.Stream;

import org.semanticweb.owlapi.model.*;

@SuppressWarnings("unchecked")
class EquivalentVisitor implements OWLAxiomVisitorEx> {

    private final boolean equiv;

    EquivalentVisitor(boolean equiv) {
        this.equiv = equiv;
    }

    @Override
    public Stream doDefault(Object o) {
        return empty();
    }

    @Override
    public Stream visit(OWLEquivalentClassesAxiom axiom) {
        if (equiv) {
            return (Stream) axiom.classExpressions();
        }
        return doDefault(axiom);
    }

    @Override
    public Stream visit(OWLEquivalentDataPropertiesAxiom axiom) {
        if (equiv) {
            return (Stream) axiom.properties();
        }
        return doDefault(axiom);
    }

    @Override
    public Stream visit(OWLEquivalentObjectPropertiesAxiom axiom) {
        if (equiv) {
            return (Stream) axiom.properties();
        }
        return doDefault(axiom);
    }

    @Override
    public Stream visit(OWLDifferentIndividualsAxiom axiom) {
        if (!equiv) {
            return (Stream) axiom.individuals();
        }
        return doDefault(axiom);
    }

    @Override
    public Stream visit(OWLSameIndividualAxiom axiom) {
        if (equiv) {
            return (Stream) axiom.individuals();
        }
        return doDefault(axiom);
    }

    @Override
    public Stream visit(OWLDisjointClassesAxiom axiom) {
        if (!equiv) {
            return (Stream) axiom.classExpressions();
        }
        return doDefault(axiom);
    }

    @Override
    public Stream visit(OWLDisjointDataPropertiesAxiom axiom) {
        if (!equiv) {
            return (Stream) axiom.properties();
        }
        return doDefault(axiom);
    }

    @Override
    public Stream visit(OWLDisjointObjectPropertiesAxiom axiom) {
        if (!equiv) {
            return (Stream) axiom.properties();
        }
        return doDefault(axiom);
    }
}