/*  Ply - A interface to implement one ply of a chess game.  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.ply;import de.java_chess.javaChess.position.*;/** * This interface has to be implemented by any ply. */public interface Ply {    // Static variables    // Methods        /**     * Get the source of the ply.     *     * @return The source square of this ply.     */    Position getSource();    /**     * Set the source of the ply.     *     * @param source The new source square for this ply.     */    void setSource( Position source);    /**     * Get the destination of the piece.     *     * @return The destination square of this ply.     */    Position getDestination();    /**     * Set the destination of the piece.     *     * @param destination The new destination square of this ply.     */    void setDestination( Position destination);    /**     * Check, if this ply captures another piece.     *     * @return true, if another piece is captured with this ply.     */    boolean isCapture();    /**     * Test, if this ply is equal to another ply.     *     * @param ply The other ply.     *     * @return true, if the 2 plies are equal. False otherwise.     */    boolean equals( Ply ply);}