Android Open Source - AudioBook Bookshelf Controller

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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./*from   w  w w  .  ja  v a 2 s .co  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.ctrl;

import java.beans.PropertyChangeListener;

import android.content.Context;
import edu.chalmers.dat255.audiobookplayer.constants.Constants;
import edu.chalmers.dat255.audiobookplayer.interfaces.IBookshelfEvents;
import edu.chalmers.dat255.audiobookplayer.model.Bookshelf;
import edu.chalmers.dat255.audiobookplayer.util.BookshelfHandler;

/**
 * Manages setting the current book and bookshelf, as well as saving it when the
 * application terminates.
 * 
 * @author Marcus Parkkinen, Aki K?kel?
 * @version 0.7
 */
public class BookshelfController implements IBookshelfEvents {
  private Bookshelf bookshelf;

  /**
   * Bookshelf constructor.
   * 
   * @param bs
   */
  public BookshelfController(Bookshelf bs) {
    bookshelf = bs;
  }

  /**
   * Selects a given book in the bookshelf.
   * 
   * @param index
   */
  public void setSelectedBook(int index) {
    if (bookshelf != null) {
      bookshelf.setSelectedBookIndex(index);
    }
  }

  /**
   * Only for testing purposes.
   * 
   * @return
   */
  public int getSelectedBookIndex() {
    if (bookshelf != null) {
      return bookshelf.getSelectedBookIndex();
    }
    return Constants.Value.NO_BOOK_SELECTED;
  }

  /**
   * Only for testing purposes.
   * 
   * @return
   */
  public int getSelectedTrackIndex() {
    if (bookshelf != null) {
      return bookshelf.getSelectedTrackIndex();
    }
    return Constants.Value.NO_TRACK_SELECTED;
  }

  /*
   * IBookshelfEvents
   */

  /*
   * (non-Javadoc)
   * 
   * @see edu.chalmers.dat255.audiobookplayer.interfaces.IBookshelfEvents#
   * setSelectedTrack(int, int)
   */
  public void setSelectedTrack(int bookIndex, int trackIndex) {
    if (bookshelf != null) {
      if (bookshelf.getSelectedBookIndex() != bookIndex) {
        bookshelf.setSelectedBookIndex(bookIndex);
      }
      bookshelf.setSelectedTrackIndex(bookIndex, trackIndex);
    }
  }

  /*
   * (non-Javadoc)
   * 
   * @see
   * edu.chalmers.dat255.audiobookplayer.interfaces.IBookshelfEvents#removeBook
   * (int)
   */
  public void removeBook(int bookIndex) {
    if (bookshelf != null) {
      try {
        bookshelf.removeBookAt(bookIndex);
      } catch (IndexOutOfBoundsException e) {
        // Expected when trying to remove last book.
      }
    }
  }

  /*
   * (non-Javadoc)
   * 
   * @see edu.chalmers.dat255.audiobookplayer.interfaces.IBookshelfEvents#
   * setBookTitleAt(int, java.lang.String)
   */
  public void setBookTitleAt(int bookIndex, String newTitle) {
    if (bookshelf != null) {
      bookshelf.setSelectedBookTitle(newTitle);
    }
  }

  /*
   * (non-Javadoc)
   * 
   * @see
   * edu.chalmers.dat255.audiobookplayer.interfaces.IBookshelfEvents#removeTrack
   * (int)
   */
  public void removeTrack(int trackIndex) {
    if (bookshelf != null) {
      try {
        bookshelf.removeTrack(trackIndex);
      } catch (IndexOutOfBoundsException e) {
        // Expected when trying to remove last track in last book.
      }
    }
  }

  /*
   * (non-Javadoc)
   * 
   * @see
   * edu.chalmers.dat255.audiobookplayer.interfaces.IBookshelfEvents#removeTrack
   * (int, int)
   */
  public void removeTrack(int bookIndex, int trackIndex) {
    if (bookshelf != null) {
      bookshelf.removeTrack(bookIndex, trackIndex);
    }
  }

  /*
   * (non-Javadoc)
   * 
   * @see
   * edu.chalmers.dat255.audiobookplayer.interfaces.IBookshelfEvents#moveTrack
   * (int, int, int)
   */
  public void moveTrack(int bookIndex, int trackIndex, int offset) {
    if (bookshelf != null) {
      try {
        bookshelf.moveTrack(bookIndex, trackIndex, offset);
      } catch (IndexOutOfBoundsException e) {
        // Expected when trying to move a track to an illegal position.
      }
    }
  }

  /*
   * End IBookshelfEvents
   */

  /**
   * Adds a listener to the bookshelf (model).
   * 
   * @param pcl
   *            The listener to add.
   */
  public void addPropertyChangeListener(PropertyChangeListener pcl) {
    if (bookshelf != null) {
      bookshelf.addPropertyChangeListener(pcl);
    }
  }

  /**
   * Removes all listeners from the model.
   */
  public void removeListeners() {
    if (bookshelf != null) {
      bookshelf.removeListeners();
    }
  }

  /**
   * Saves the model (a "Bookmark").
   * 
   * @param c
   *            Context
   * @param username
   *            Name of file.
   * @return True if saved successfully.
   */
  public boolean saveBookshelf(Context c, String username) {
    return BookshelfHandler.saveBookshelf(c, username, bookshelf);
  }

}

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