net.sourceforge.atunes.kernel.modules.playlist.PlayListReader.java Source code

Introduction

Here is the source code for net.sourceforge.atunes.kernel.modules.playlist.PlayListReader.java

Source

/*
 * aTunes
 * Copyright (C) Alex Aranda, Sylvain Gaudard and contributors
 *
 * See http://www.atunes.org/wiki/index.php?title=Contributing for information about contributors
 *
 * http://www.atunes.org
 * http://sourceforge.net/projects/atunes
 *
 * 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.
 */

package net.sourceforge.atunes.kernel.modules.playlist;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import net.sourceforge.atunes.model.IRepositoryHandler;
import net.sourceforge.atunes.utils.ClosingUtils;
import net.sourceforge.atunes.utils.FileUtils;
import net.sourceforge.atunes.utils.Logger;
import net.sourceforge.atunes.utils.Timer;

import org.apache.commons.io.IOUtils;

/**
 * Reads play lists
 * 
 * @author alex
 * 
 */
public class PlayListReader {

    private IRepositoryHandler repositoryHandler;

    /**
     * @param repositoryHandler
     */
    public void setRepositoryHandler(final IRepositoryHandler repositoryHandler) {
        this.repositoryHandler = repositoryHandler;
    }

    /**
     * This function reads the filenames from the playlist file, trying to find
     * the ones present in repository, which are returned in a list
     * 
     * @param file
     *            The playlist file
     * 
     * @return Returns an List of files of the playlist as String.
     */
    List<String> read(final File file) {
        Timer t = new Timer();
        t.start();
        FileReader fr = null;
        try {
            List<File> repositoryFolders = this.repositoryHandler.getFolders();
            fr = new FileReader(file);
            List<String> fileContent = IOUtils.readLines(fr);
            List<String> result = new ArrayList<String>();
            for (String line : fileContent) {
                String fullPath = getFileIfExistsInRepository(repositoryFolders, line);
                if (fullPath != null) {
                    result.add(fullPath);
                }
            }
            Logger.debug("Time to read playlist file: ", t.stop(), " seconds");
            return result;
        } catch (IOException e) {
            return Collections.emptyList();
        } finally {
            ClosingUtils.close(fr);
        }
    }

    private String getFileIfExistsInRepository(final List<File> repositoryFolders, final String relativeFile) {
        for (File repositoryFolder : repositoryFolders) {
            String filePath = FileUtils.getPath(repositoryFolder) + relativeFile;
            if (new File(filePath).exists()) {
                return filePath;
            }
        }
        // File does not exist
        return null;
    }
}