Android Open Source - watchme Movie Helper

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License

The source code is released under:

Copyright (c) 2012 Johan Brook, Robin Andersson, Lisa Stenberg, Mattias Henriksson Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documen...

Java Source Code

/**
*  MovieHelper.java/*  w ww  .  jav a2  s. co m*/
*
*  Various util functions when dealing with movies or collections
*  of movies.
*
*  @author Johan Brook
*  @copyright (c) 2012 Johan Brook, Robin Andersson, Lisa Stenberg, Mattias Henriksson
*  @license MIT
*/

package se.chalmers.watchme.utils;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import org.json.JSONArray;
import org.json.JSONObject;

import android.database.Cursor;
import se.chalmers.watchme.model.Movie;
import se.chalmers.watchme.model.Tag;

public class MovieHelper {
  
  private MovieHelper() {}
  
  /**
   * Convert a JSONArray to a List
   * 
   * @param json The JSONArray to convert
   * @return A List with the generic types specified
   */
  @SuppressWarnings("unchecked")
  public static <T> List<T> jsonArrayToList(JSONArray json) {
    List<T> list = new ArrayList<T>();
    for(int i = 0; i < json.length(); i++) {
      list.add((T) json.opt(i));
    }
    
    return list;
  }
  
  
  /**
   * Get the URL for a poster from a JSONArray of poster objects.
   * 
   * <p>Since Java lacks sane collection methods like select, map, etc al,
   * we have to do this by ourselves.</p>
   * 
   * <p>From a JSONArray of posters, get the *first* URL that matches the 
   * <code>size</code> parameter.</p>
   * 
   * @param posters A non-null JSONArray of posters. Assumes the JSONArray is
   * organized as <code>image</code> objects with the keys <code>size</code>
   * and <code>url</code>.
   * @param size The desired size
   * @return A URL as string with the first matching poster size. Otherwise null.
   */
  public static String getPosterFromCollection(JSONArray posters, Movie.PosterSize size) {
    String url = null;
    
    if(posters != null && posters.length() > 0) {
        for(int i = 0; i < posters.length(); i++) {
          JSONObject image = posters.optJSONObject(i).optJSONObject("image");
          
          if(image.optString("size").equals(size.getSize())) {
            url = image.optString("url");
            break;
          }
        }
      }
    
    return url;
  }
  
  
  /**
   * Convert a JSONArray of Movies to a list of Movies
   * 
   * <p>Each Movie object is initialized with the attribute
   * <code>original_name</code> from the input array. The 
   * attribute <code>imdb_id</code> is also set on the movie.</p>
   * 
   * @param input The JSONArray of movies as JSONObjects
   * @return A List of Movies
   */
  public static List<Movie> jsonArrayToMovieList(JSONArray input) {
    List<Movie> list = new ArrayList<Movie>();
    
    // Parse the JSON objects and add to list
    for(int i = 0; i < input.length(); i++) {
      JSONObject o = input.optJSONObject(i);
      
      Movie movie = new Movie(o.optString(Movie.JSON_KEY_NAME));
      // Don't forget the ID
      movie.setApiID(o.optInt(Movie.JSON_KEY_ID));
      list.add(movie);
    }
    
    return list;
  }
  
  /**
   * Return a String that represents a Cursor.
   * 
   * Creates a string with the elements in column 1 (with 0 being the first),
   * with the elements separated by ","
   * 
   * @author lisastenberg
   * @param cursor The Cursor.
   * @return a String that represents the cursor.
   */
  public static String getCursorString(Cursor cursor) {
    String s = "";
    if (cursor.moveToFirst()) {
      s = s + cursor.getString(1);

      while (cursor.moveToNext()) {
        s = s + ", " + cursor.getString(1);
      }
    }
    cursor.close();

    if (s.equals("null")) {
      s = "";
    }
    return s;
  }
  
  /**
   * Helper method for converting a stringArray with tag names to a list with
   * Tag objects
   * 
   * @param tagStrings The array with tag-titles to be converted to tags
   * @return A list with Tag objects
   */
  public static List<Tag> stringArrayToTagList(String[] tagStrings) {
    
    List<Tag> tags = new LinkedList<Tag>();
    
    for(String tagString : tagStrings) {
      if (!tagString.equals("")) {

        /*
         * Remove whitespaces from the beginning and end of each string
         * to allow for multi-word tags.
         */
        tags.add(new Tag(tagString.trim()));
      }
    }
    
    return tags;
  }
}

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