FlatFileIterator.java

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/*
 * Gridarta MMORPG map editor for Crossfire, Daimonin and similar games.
 * Copyright (C) 2000-2023 The Gridarta Developers.
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
package net.sf.gridarta.model.io;
 
import java.io.File;
import java.util.Arrays;
import java.util.Iterator;
import java.util.NoSuchElementException;
import org.jetbrains.annotations.NotNull;
 
public class FlatFileIterator implements Iterator<File> {
 
    @NotNull
    private static final File @NotNull [] EMPTY_FILE_ARRAY = new File[0];
 
    @NotNull
    private final File @NotNull [] files;
 
    private int pos;
 
    public FlatFileIterator(@NotNull final File dir) {
        final File[] tmp = dir.listFiles();
        files = tmp == null ? EMPTY_FILE_ARRAY : tmp;
        Arrays.sort(files);
        skipSpecialNames();
    }
 
    /* {@inheritDoc} */
 
    @Override
    public boolean hasNext() {
        return pos < files.length;
    }
 
    @Override
    public File next() {
        if (pos >= files.length) {
            throw new NoSuchElementException("no more elements");
        }
 
        final File result = files[pos++];
        skipSpecialNames();
        return result;
    }
 
    @Override
    public void remove() {
        throw new UnsupportedOperationException("unsupported operation");
    }
 
    private void skipSpecialNames() {
        while (pos < files.length && files[pos].getName().equalsIgnoreCase(".svn")) {
            pos++;
        }
    }
 
}