Android Open Source - AudioBook Book Creator

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The source code is released under:

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Java Source Code

/**
 *  This work is licensed under the Creative Commons Attribution-NonCommercial-
 *  NoDerivs 3.0 Unported License. To view a copy of this license, visit
 *  http://creativecommons.org/licenses/by-nc-nd/3.0/ or send a letter to 
 *  Creative Commons, 444 Castro Street, Suite 900, Mountain View, California, 
 *  94041, USA.// w  w  w.ja v  a2s .c  o  m
 * 
 *  Use of this work is permitted only in accordance with license rights granted.
 *  Materials provided "AS IS"; no representations or warranties provided.
 * 
 *  Copyright ? 2012 Marcus Parkkinen, Aki K?kel?, Fredrik ?hs.
 **/

package edu.chalmers.dat255.audiobookplayer.util;

import java.util.LinkedList;
import java.util.List;

import android.media.MediaMetadataRetriever;
import android.util.Log;
import edu.chalmers.dat255.audiobookplayer.model.Book;
import edu.chalmers.dat255.audiobookplayer.model.Bookshelf;
import edu.chalmers.dat255.audiobookplayer.model.Track;

/**
 * Creates Book instances (filling them with metadata).
 * 
 * @author Aki K?kel?, Fredrik ?hs
 * @version 0.6
 * 
 */
public final class BookCreator {
  private static final String TAG = "BookCreator.class";
  private static BookCreator instance = null;
  private Bookshelf bsh;

  private BookCreator() {
  } // To disable outside instantiation

  /**
   * @return The instance of this object.
   */
  public static BookCreator getInstance() {
    if (instance == null) {
      instance = new BookCreator();
    }
    return instance;
  }

  /**
   * @param bsh
   */
  public void setBookshelf(Bookshelf bsh) {
    this.bsh = bsh;
  }

  /**
   * Creates a book with given parameters.
   * 
   * @param paths
   *            A list paths to all the tracks that will be added.
   * @param title
   *            The title of the book.
   * @param author
   *            The author of the book.
   */
  public boolean createBookToBookshelf(List<String> paths, String title,
      String author) {
    Book b = createBook(paths, title, author);

    if (b != null) {
      bsh.addBook(b);
      return true;
    }

    return false;
  }

  /**
   * Helper class.
   * 
   * In future versions, this should be used instead of adding directly to the
   * bookshelf (see Issue #1 on the issue tracker).
   * 
   * @param paths
   *            A list paths to all the tracks that will be added.
   * @param title
   *            The title of the book.
   * @param author
   *            The author of the book.
   * @return A book created with given data.
   */
  private Book createBook(List<String> paths, String title, String author) {
    String tmpTitle = title;
    String tmpAuthor = author;
    // if no tracks, do not create book
    if (paths.size() == 0) {
      return null;
    }
    MediaMetadataRetriever mmr = new MediaMetadataRetriever();
    // assumes
    try {
      mmr.setDataSource(paths.get(0));

    } catch (IllegalArgumentException e) {
      Log.d(TAG, " invalid path to book provided. Skipping operation.");
      return null;
    }

    // try to retrieve metadata ALBUM which is where the title of the book
    // should typically be stored
    tmpTitle = mmr
        .extractMetadata(MediaMetadataRetriever.METADATA_KEY_ALBUM);
    if (tmpTitle == null || tmpTitle.length() == 0) {
      tmpTitle = title;
    }
    // try to retrieve metadata ARTIST which is where the author of the book
    // should typically be stored
    tmpAuthor = mmr
        .extractMetadata(MediaMetadataRetriever.METADATA_KEY_ARTIST);
    if (tmpAuthor == null || tmpAuthor.length() == 0) {
      tmpAuthor = author;
    }
    List<Track> trackList = new LinkedList<Track>();
    for (String path : paths) {
      try {
        trackList.add(TrackCreator.createTrack(path));
      } catch (Exception e) {
        // If a track contains malformed data, do not add it to the book
        continue;
      }
    }
    return new Book(trackList, tmpTitle, tmpAuthor);
  }

}

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