savant.controller.RecentTracksController.java Source code

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Here is the source code for savant.controller.RecentTracksController.java

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/**
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package savant.controller;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.LinkedList;
import java.util.List;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JSeparator;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import savant.api.adapter.DataSourceAdapter;
import savant.api.adapter.TrackAdapter;
import savant.api.util.DialogUtils;
import savant.api.util.Listener;
import savant.api.event.TrackEvent;
import savant.settings.DirectorySettings;
import savant.util.NetworkUtils;
import savant.view.tracks.BAMCoverageTrack;

/**
 *
 * @author mfiume
 */
public class RecentTracksController {
    private static final Log LOG = LogFactory.getLog(RecentTracksController.class);

    private static RecentTracksController instance;

    private static final String RECENT_TRACKS_FILE = ".recent_tracks";
    private final int NUM_RECENTS_TO_SAVE = 10;

    JMenu menu;
    LinkedList<String> queue;

    private File recentTracksFile;

    public static RecentTracksController getInstance() throws IOException {
        if (instance == null) {
            instance = new RecentTracksController();
        }
        return instance;
    }

    private RecentTracksController() throws IOException {
        TrackController.getInstance().addListener(new Listener<TrackEvent>() {

            @Override
            public void handleEvent(TrackEvent event) {
                if (event.getType() == TrackEvent.Type.ADDED) {
                    TrackAdapter t = event.getTrack();

                    if (t instanceof BAMCoverageTrack) {
                        return;
                    }

                    DataSourceAdapter ds = t.getDataSource();

                    if (ds == null || ds.getURI() == null) {
                        return;
                    }

                    String path = NetworkUtils.getNeatPathFromURI(ds.getURI());

                    queue.remove(path);
                    resizeQueue(queue, NUM_RECENTS_TO_SAVE);
                    queue.add(0, path);
                    updateMenuList();

                    try {
                        saveRecents(queue);
                    } catch (IOException ex) {
                        LOG.error("Could not save recents to file", ex);
                    }
                }
            }
        });

        recentTracksFile = new File(DirectorySettings.getSavantDirectory(), RECENT_TRACKS_FILE);
        if (!recentTracksFile.exists()) {
            recentTracksFile.createNewFile();
        }
        queue = new LinkedList<String>();
        loadRecents(recentTracksFile);
    }

    public List<String> getRecentTracks() {
        return queue;
    }

    private void resizeQueue(LinkedList queue, int size) {
        while (queue.size() > size) {
            queue.removeLast();
        }
    }

    public void populateMenu(JMenu m) {
        menu = m;
        updateMenuList();
    }

    private void updateMenuList() {
        menu.removeAll();
        for (final String s : queue) {
            JMenuItem item = new JMenuItem();
            item.addActionListener(new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    try {
                        FrameController.getInstance().addTrackFromPath(s, null, null);
                    } catch (Exception ex) {
                        LOG.error("Unable to open file.", ex);
                        DialogUtils.displayError("Problem opening track from file " + s);
                    }
                }
            });
            item.setText(s);
            menu.add(item);
        }

        menu.add(new JSeparator());

        JMenuItem item = new JMenuItem();
        item.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                try {
                    RecentTracksController.getInstance().clearRecents();
                } catch (Exception ex) {
                }
            }
        });
        item.setText("Clear Recents");
        menu.add(item);
    }

    private void clearRecents() {
        while (!queue.isEmpty()) {
            queue.remove(0);
        }
        try {
            saveRecents(queue);
        } catch (IOException ex) {
        }
        updateMenuList();
    }

    private void saveRecents(LinkedList<String> queue) throws IOException {
        recentTracksFile.delete();
        recentTracksFile.createNewFile();
        BufferedWriter w = new BufferedWriter(new FileWriter(recentTracksFile));
        for (String s : queue) {
            w.write(s + "\n");
        }
        w.close();
    }

    private void loadRecents(File f) throws IOException {
        BufferedReader r = new BufferedReader(new FileReader(f));
        String line = "";
        while ((line = r.readLine()) != null) {
            queue.add(line);
        }
        r.close();
    }
}