/*  PlyHashtableEntry - A interface to define the functionality of                      a entry in the ply hashtable.  Copyright (C) 2003 The Java-Chess team <info@java-chess.de>  This program is free software; you can redistribute it and/or  modify it under the terms of the GNU General Public License  as published by the Free Software Foundation; either version 2  of the License, or (at your option) any later version.  This program 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 General Public License for more details.  You should have received a copy of the GNU General Public License  along with this program; if not, write to the Free Software  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.*/ package de.java_chess.javaChess.engine.hashtable;import de.java_chess.javaChess.board.*;import de.java_chess.javaChess.ply.*;/** * This interface defines the functionality of a entry in * the ply hashtable. */public interface PlyHashtableEntry {    // Methods    /**     * Get the color, that is supposed to apply this ply.     *     * @return true, if white applies this ply.     */    boolean isWhiteMove();    /**     * Get the game position before the ply is applied.     *     * @return The board before the ply is applied.     */    Board getBoard();    /**     * Get the ply.     *     * @return The ply.     */    Ply getPly();    /**     * Get the search depth for the computed ply.     *     * @return The search depth for the computed ply.     */    int getSearchDepth();    /**     * Request a key for this entry.     *     * @return The key for this entry.     */    long hashKey();}