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/*
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Copyright (c) 2010,2015 Jeff Martin, Tim Bacon
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*/

package org.custommonkey.xmlunit;

import org.w3c.dom.Node;

/**
 * The pieces of DifferenceEngine's API used by Diff.
 *
 * This interface allows Diff to switch between {@link
 * DifferenceEngine} and {@link NewDifferenceEngine} at will.
 */
public interface DifferenceEngineContract {
    /**
     * @param matchTracker the instance that is notified on each
     * successful match.  May be null.
     */
    void setMatchTracker(MatchTracker matchTracker);
    /**
     * Entry point for Node comparison testing.
     * @param control Control XML to compare
     * @param test Test XML to compare
     * @param listener Notified of any {@link Difference differences} detected
     * during node comparison testing
     * @param elementQualifier Used to determine which elements qualify for
     * comparison e.g. when a node has repeated child elements that may occur
     * in any sequence and that sequence is not considered important. 
     */
    void compare(Node control, Node test, DifferenceListener listener, 
                 ElementQualifier elementQualifier);
}