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package com.fourisland.fourpuzzle.gamestate.mapview.event.precondition;

/**
 * A Precondition is an object that helps <b>LayerEvent</b> to determine which
 * of its (possibly many) <b>PossibleEvent</b>s is active. PossibleEvents can
 * have Preconditions attached to them and when all Preconditions are fulfilled
 * (determined by the <code>true</code> return value from <b>match()</b>) and
 * there aren't any fulfilled PossibleEvents later in the queue, said
 * PossibleEvent will be active.
 *
 * @author hatkirby
 */
public interface Precondition {

    public boolean match();
    
}