package genListFW;

/**
 * Defines an immutable list that holds elements of type E.
 * Serves as a host for an algorithm on a list to visit its internal structure.
 * Has a "hook" method to call on the appropriate method of the visitor, making
 * the immutable list structure a framework.
 * @author Dung X. Nguyen
 * @author Stephen B. Wong
 * @since Copyright 2004 - DXN, SBW All rights reserved
 * @stereotype host
 */
public interface IList<E> {
    /**
     * A visitor pattern "hook" method that executes an <code>IListAlgo</code>.
     * @param algo the visitor, the algorithm to be executed.  
     * Any visitor that works on a super type of E is accepted.
     * @param inp a generic input parameter to be used by the algorithm algo.
     * @return <code>Object</code> output from executing the algorithm algo.
     */
    public abstract  <R,P>  R execute(IListAlgo<? super E, R, P> algo, P ... inp);
}