FileSearcher.java

/*
 * Copyright (C) 2015-2017 PÂRIS Quentin
 *
 * 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 org.phoenicis.tools.files;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class FileSearcher extends FilesManipulator {
    private static final Logger LOGGER = LoggerFactory.getLogger(FileSearcher.class);

    public List<File> search(String directory, String name) {
        return search(new File(directory), name);
    }

    public List<File> search(File directory, String name) {
        assertInDirectory(directory);
        if (!directory.exists()) {
            return Collections.emptyList();
        }
        final List<File> results = new ArrayList<>();

        Path startPath = Paths.get(directory.getAbsolutePath());
        try {
            Files.walkFileTree(startPath, new SimpleFileVisitor<Path>() {
                @Override
                public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
                    return FileVisitResult.CONTINUE;
                }

                @Override
                public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
                    if (name.equalsIgnoreCase(file.getFileName().toString())) {
                        results.add(file.toFile());
                    }
                    return FileVisitResult.CONTINUE;
                }

                @Override
                public FileVisitResult visitFileFailed(Path file, IOException e) {
                    return FileVisitResult.CONTINUE;
                }
            });
        } catch (IOException e) {
            LOGGER.warn("Cannot search into directory: " + directory, e);
            return Collections.emptyList();
        }

        return results;
    }
}