Android Open Source - AudioBook Bookshelf Handler

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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  . j a  v  a 2  s.  c om
 * 
 *  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.io.IOException;

import android.content.Context;
import edu.chalmers.dat255.audiobookplayer.model.Bookshelf;

/**
 * Loads and saves bookshelf data.
 * 
 * @author Aki K?kel?, Marcus Parkkinen
 * @version 0.1
 * 
 */
public final class BookshelfHandler {

  private BookshelfHandler() {
  } // to defeat instantiation

  /**
   * Attempt to load the model object tree from a file. This method
   * instantiates the member variable with either a new Bookshelf or a
   * existing one from a file.
   * 
   * A reference to the bookshelf is also returned to the calling method.
   * 
   * @param Context
   *            context
   * @param String
   *            username
   */
  public static Bookshelf loadBookshelf(Context c, String username) {
    try {
      // read
      Object obj = JsonParser.fromJSON(FileParser
          .readFromInternalStorage(username + ".bookmark", c),
          Bookshelf.class);
      if (obj instanceof Bookshelf) {
        // if we found a bookshelf type object, return it
        return ((Bookshelf) obj);
      }
    } catch (Exception e) {
      // If anything goes wrong, just continue..
    }
    // return a new bookshelf instance if nothing was found
    return (new Bookshelf());
  }

  /**
   * Save a JSON representation of the model object tree to file.
   * 
   * @param bs
   * 
   * @param Context
   *            context
   * @param String
   *            username
   */
  public static boolean saveBookshelf(Context c, String username, Bookshelf bs) {
    try {
      // write
      FileParser.writeToInternalStorage(username + ".bookmark", c,
          JsonParser.toJSON(bs));
    } catch (IOException e) {
      // the saving failed; show it by returning false
      return false;
    }
    // saving was successful
    return true;
  }

}

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