Class: Hallon::PlaylistContainer::Contents

Inherits:
Enumerator
  • Object
show all
Defined in:
lib/hallon/playlist_container.rb

Overview

Enumerates through all playlists and folders of a container.

Instance Attribute Summary

Attributes inherited from Enumerator

#pointer

Instance Method Summary collapse

Methods inherited from Enumerator

#[], #each, #empty?, #initialize, item, size, #to_s

Constructor Details

This class inherits a constructor from Hallon::Enumerator

Instance Method Details

#at(index) ⇒ Playlist, ...

Returns:



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# File 'lib/hallon/playlist_container.rb', line 16

item :playlistcontainer_playlist_type do |type, index, pointer|
  case type
  when :playlist
    playlist = Spotify.playlistcontainer_playlist(pointer, index)
    Playlist.from(playlist)
  when :start_folder, :end_folder
    Folder.new(pointer, folder_range(index, type))
  else # :unknown
  end
end

#folder_id(index) ⇒ Integer (protected)

Returns folder ID of folder at index.

Returns:

  • (Integer) —

    folder ID of folder at index.



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# File 'lib/hallon/playlist_container.rb', line 54

def folder_id(index)
  Spotify.playlistcontainer_playlist_folder_id(pointer, index)
end

#folder_range(index, type) ⇒ Range (protected)

Given an index, find out the starting point and ending point of the folder at that index.

Parameters:

  • index (Integer)
  • type (Symbol)

Returns:

  • (Range) —

    begin..end



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# File 'lib/hallon/playlist_container.rb', line 35

def folder_range(index, type)
  id      = folder_id(index)
  same_id = proc { |idx| folder_id(idx) == id }

  case type
  when :start_folder
    beginning = index
    ending    = (index + 1).upto(size - 1).find(&same_id)
  when :end_folder
    ending    = index
    beginning = (index - 1).downto(0).find(&same_id)
  end

  if beginning and ending and beginning != ending
    beginning..ending
  end
end

#size ⇒ Integer

Returns size of this enumerator.

Returns:

  • (Integer) —

    size of this enumerator



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# File 'lib/hallon/playlist_container.rb', line 13

size :playlistcontainer_num_playlists