/*  PlyHashtable - A interface to define the functionality to control                 a hashtable with chess plies.  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 to control a * hashtable with chess plies. */public interface PlyHashtable {    // Methods    /**     * Reset the hashtables for a new game.     */    void reset();    /**     * Get the maximum number of entries in the hashtable.     *     * @return The maximum number of entries in the hashtable.     */    int getMaximumSize();    /**     * Set the maximum number of entries in the hashtable.     *     * @param maximumEntries The new maximum number of entries.     */    void setMaximumSize( int maximumEntries);    /**     * Get the current number of entries.     *     * @return The current number of entries.     */    int getSize();    /**     * Try to push a new entry into the hashtable.     *     * @param entry The new entry, that the hashtable might store.     */    void pushEntry( PlyHashtableEntry ply);    /**     * Get the stored ply for a given board and piece color.     *     * @param board The board before the move.     * @param white Flag to indicate, if we want a move with the white pieces.     */    Ply getPly( Board board, boolean white);    /**     * Try to remove the oldest entry.     */    void removeOldestEntry();}