/*  LoadOpeningsAction - A action to load a 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.engine.opening_book.action;import antlr.*;import de.java_chess.javaChess.action.*;import de.java_chess.javaChess.engine.opening_book.*;import de.java_chess.javaChess.notation.*;import de.java_chess.javaChess.pgn.*;import java.awt.event.*;import java.io.*;import javax.swing.*;/** * This class loads openings recursively from directories and PGN files. */public class LoadOpeningsAction extends JavaChessAction {    // Instance variables    /**     * The opening book, we are operating on.     */    OpeningBook _openingBook;        // Constructors    /**     * Create a new action instance.     *     * @param book The opening book, we are operating on.     */    public LoadOpeningsAction( OpeningBook book) {	super( "Load openings from PGN...");	setOpeningBook( book);    }        // Methods    /**     * The actual action.     *     * @param event The event, that caused this action.     */    public void actionPerformed( ActionEvent event) {        JFileChooser chooser = new JFileChooser();        chooser.setDialogTitle( "Load opening from pgn files");        chooser.setFileFilter( SaveGameAsAction.getPGNFileFilter());	// Allow the user to select directories.	chooser.setFileSelectionMode( JFileChooser.FILES_AND_DIRECTORIES);	int retval = chooser.showOpenDialog( null);        if( retval == JFileChooser.APPROVE_OPTION) {            File file = chooser.getSelectedFile();	    processFileOrDirectory( file);        }     }    /**     * Process a file or directory.     *     * @param file The file to process.     */    private final void processFileOrDirectory( File file) {	// If this file is a directory, read all the files in it.	if( file.isDirectory()) {	    	    String [] files = file.list();  // Get the content of the directory	    // Now create an absolute file from each name and process it.	    for( int i = 0; i < files.length; i++) {		processFileOrDirectory( new File( file, files[i]));	    }             	} else {  // This is a single file, so	          // check, if it might be a PGN file.	    if( SaveGameAsAction.getPGNFileFilter().accept( file)) {		processPGNfile( file);	    }	}    }    /**     * Process a single PGN file.     *     * @param file The PGN file to process.     */    private final void processPGNfile( File file) {	getOpeningBook().addPGNopening( file);    }    /**     * Get the current opening book.     *     * @return The current opening book.     */    private final OpeningBook getOpeningBook() {	return _openingBook;    }    /**     * Set the opening book, we are operating on.     *     * @param book The new opening book.     */    private final void setOpeningBook( OpeningBook book) {	_openingBook = book;    }}