/*
 * Copyright (c) 2014, grossmann
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the name of the jo-widgets.org nor the
 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL jo-widgets.org BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

package org.jowidgets.util.collection;

public interface IObserverSetFactory {

    enum Strategy {

        /**
         * Uses more memory for a better performance
         */
        HIGH_PERFORMANCE,

        /**
         * Needs more computing power for a better memory management
         */
        LOW_MEMORY;

    }

    /**
     * @return The default strategy of this factory
     */
    Strategy getDefaultStrategy();

    /**
     * Creates an observer set with the default strategy
     * 
     * @return The created observer set
     */
    <OBSERVER_TYPE> IObserverSet<OBSERVER_TYPE> create();

    /**
     * Creates an observer set for the given strategy
     * 
     * @param strategy The strategy to use, must not be null
     * 
     * @return The created observer set
     */
    <OBSERVER_TYPE> IObserverSet<OBSERVER_TYPE> create(Strategy strategy);

    /**
     * Gets a singleton instance of an unmodifiable empty set
     * 
     * @return An unmodifiable empty set
     */
    <OBSERVER_TYPE> IObserverSet<OBSERVER_TYPE> emptySet();

}