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package org.coode.oppl.utils;

import static org.coode.oppl.utils.ArgCheck.checkNotNull;

import java.util.Collections;
import java.util.List;

import org.semanticweb.owlapi.model.OWLObject;

/** @author Luigi Iannone */
public class Position {
    /** empty position */
    public final static List EMPTY_POSITION = Collections.singletonList(-1);
    private final static OWLObjectDecomposer DECOMPOSER = new OWLObjectDecomposer();

    /** @param owlObject
     *            owlObject
     * @param position
     *            position
     * @return found object, or null */
    public static Object get(OWLObject owlObject, List position) {
        checkNotNull(owlObject, "owlObject");
        checkNotNull(position, "position");
        Object toReturn = owlObject;
        if (!position.isEmpty()) {
            Integer index = position.get(0);
            List parts = owlObject.accept(DECOMPOSER);
            if (index >= 1 && index <= parts.size()) {
                toReturn = parts.get(index - 1);
                if (position.size() > 1) {
                    if (toReturn instanceof OWLObject) {
                        List newPosition = position.subList(1, parts.size());
                        toReturn = get((OWLObject) toReturn, newPosition);
                    } else {
                        toReturn = null;
                    }
                }
            } else if (index != 0) {
                toReturn = null;
            }
        }
        return toReturn;
    }
}
    

    

    

            

    

            



    
    






    
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