/*
 * Copyright (C) 2005-2010 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Alfresco is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
 */
package org.alfresco.filesys.repo.rules;

import java.util.List;

/**
 * A scenario is a factory for scenario instances.
 * 
 */
public interface Scenario
{
    /**
     * Create a new ScenarioInstance
     * <p>
     * If the scenario is interested in the specified operation then 
     * return a new scenario instance.
     * @param currentInstances the current instances of all scenarios. 
     * @param operation the operation to be performed
     * @return the scenario instance or null if a new instance is not required.
     */
    ScenarioInstance createInstance(EvaluatorContext ctx, Operation operation);
      
    
}