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Extensions to the OWL API (http://owlapi.sourceforge.net/) for Protege

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package org.protege.owlapi.util;

import java.util.Comparator;

import org.semanticweb.owlapi.model.OWLOntology;

public class ImportsClosureComparator implements Comparator {

	public int compare(OWLOntology o1, OWLOntology o2) {
		boolean o1ImportsO2 = o1.getImportsClosure().contains(o2);
		boolean o2ImportsO1 = o2.getImportsClosure().contains(o1);
		if (o1ImportsO2 && !o2ImportsO1) {
			return 1;
		}
		else if (o2ImportsO1 && !o1ImportsO2) {
			return -1;
		}
		else {
			return o1.compareTo(o2);
		}
	}

}