module Ym4r::YahooMaps::BuildingBlock::Traffic

Public Class Methods

get(param) click to toggle source

Send a request to the traffic REST API.

# File lib/ym4r/yahoo_maps/building_block/traffic.rb, line 11
def self.get(param)
  unless param.has_key?(:street) or
      param.has_key?(:city) or
      param.has_key?(:state) or
      param.has_key?(:zip) or
      param.has_key?(:location) or
      (param.has_key?(:longitude) and param.has_key?(:latitude))
    raise MissingParameterException.new("Missing location data for the Yahoo! Maps Traffic service")
  end
  
  url = "http://api.local.yahoo.com/MapsService/V1/trafficData?appid=#{Ym4r::YahooMaps::APP_ID}&"
  url << "street=#{param[:street]}&" if param.has_key?(:street)
  url << "city=#{param[:city]}&" if param.has_key?(:city)
  url << "state=#{param[:state]}&" if param.has_key?(:state)
  url << "zip=#{param[:zip]}&" if param.has_key?(:zip)
  url << "location=#{param[:location]}&" if param.has_key?(:location)
  url << "latitude=#{param[:latitude]}&" if param.has_key?(:latitude)
  url << "longitude=#{param[:longitude]}&" if param.has_key?(:longitude)
  url << "image_type=#{param[:image_type]}&" if param.has_key?(:image_type) #defaults to PNG

  url << "image_height=#{param[:image_height]}&" if param.has_key?(:image_height) #defaults to 500

  url << "image_width=#{param[:image_width]}&" if param.has_key?(:image_width) #defaults to 620

  url << "zoom=#{param[:zoom]}&" if param.has_key?(:zoom) #defaults to 6

  url << "radius=#{param[:radius]}&" if param.has_key?(:radius)
  url << "include_map=#{param[:include_map]?1:0}&" if param.has_key?(:include_map)
  url << "severity=#{param[:severity]}&" if param.has_key?(:severity)
  url << "output=xml"
  
  begin
    xml = open(URI.encode(url)).read
  rescue OpenURI::HTTPError => error
    raise BadRequestException.new(error.to_s)
  rescue
    raise ConnectionException.new("Unable to connect to Yahoo! Maps Traffic REST service")
  end
  
  doc = REXML::Document.new(xml) 
  
  if doc.root.name == "Error"
    raise RateLimitExceededException.new("Rate limit exceeded for Yahoo! Maps Traffic REST service")
  else
    results = Traffic::ResultSet.new(Time.at(doc.root.elements['LastUpdateDate'].text.to_i),doc.root.elements['Warning'].nil? ? nil : doc.root.elements['Warning'].text)
    
    doc.root.elements.each('//Result') do |result|
      data = result.elements
      results << Traffic::Result.new(result.attributes['type'],
                                     data['Title'].text,
                                     data['Description'].text,
                                     data['Latitude'].text.to_f,
                                     data['Longitude'].text.to_f,
                                     data['Direction'].text,
                                     data['Severity'].text.to_i,
                                     Time.at(data['ReportDate'].text.to_i),
                                     Time.at(data['UpdateDate'].text.to_i),
                                     Time.at(data['EndDate'].text.to_i),
                                     data['ImageUrl'].nil? ? nil : data['ImageUrl'].text)
    end
    results
    
  end
end