def initialize()

@topics = []

@examples = []

@doctags = []

@contributors = []

@contributortypes = []

@topichistories = []

@display_names = {}

end

def load_json (file)

# A little meta programming here to simplify things.

eval("@#{file} = JSON.parse(IO.read('#{file}.json')) if @#{file}.empty?")

return eval("@#{file}")

end

def index (array, index)

lookup = {}

Array(load_json(array)).each do | node |

lookup[node[index]] = node

end

return lookup

end

def multi_index (array, index)

lookup = {}

Array(load_json(array)).each do | node |

lookup[node[index]] ||= []

lookup[node[index]].push(node)

end

return lookup

end

def fetch_display_names(user_ids)

user_ids.each do | id |

# Default to userXXXX in case we can't find the user via the API

@display_names[id] ||= "user#{id}"

end

# The API only supports 100 user_ids at a time: http://api.stackexchange.com/docs/users-by-ids

user_ids.each_slice(100) do | a |

ids = a.join(';')

uri = URI("http://api.stackexchange.com/2.2/users/#{ids}")

params = { :site => 'stackoverflow',

:pagesize => 100 }

params[:key] = 'vff6LW*9JQzZOECmU1FK1g((' # This is not considered a secret.

uri.query = URI.encode_www_form(params)

response = HTTParty.get(uri)

case response.code

when 200

users = JSON.parse(response.body)['items']

users.each do | user |

@display_names[user['user_id']] = user['display_name']

end

else

STDERR.puts uri, uri.to_s.length, response.code

STDERR.puts response

end

end

return @display_names

end