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Contents
require 'open-uri'
require 'time'
require 'rexml/document'
# Example:
#
# flickr = Flickr.new('http://www.flickr.com/services/feeds/photos_public.gne?id=40235412@N00&format=rss_200')
# flickr.pics.each do |pic|
# puts "#{pic.title} @ #{pic.link} updated at #{pic.date}"
# end
#
class FlickrAggregation
include REXML
def choose(num)
return pics unless pics.size > num
bag = []
set = pics.dup
num.times {|x| bag << set.delete_at(rand(set.size))}
bag
end
attr_accessor :url, :pics, :link, :title, :description
# This object holds given information of a picture
class Picture
attr_accessor :link, :title, :date, :description, :thumbnail
def to_s
title
end
def date=(value)
@date = Time.parse(value)
end
end
# Pass the url to the RSS feed you would like to keep tabs on
# by default this will request the rss from the server right away and
# fill the tasks array
def initialize(url, refresh = true)
self.pics = []
self.url = url
self.refresh if refresh
end
# This method lets you refresh the tasks int the tasks array
# useful if you keep the object cached in memory and
def refresh
open(@url) do |http|
parse(http.read)
end
end
private
def parse(body)
xml = Document.new(body)
self.pics = []
self.link = XPath.match(xml, "//channel/link/text()").to_s
self.title = XPath.match(xml, "//channel/title/text()").to_s
self.description = XPath.match(xml, "//channel/description/text()").to_s
XPath.each(xml, "//item/") do |elem|
picture = Picture.new
picture.title = XPath.match(elem, "title/text()").to_s
picture.date = XPath.match(elem, "pubDate/text()").to_s
picture.link = XPath.match(elem, "link/text()").to_s
picture.description = XPath.match(elem, "description/text()").to_s
picture.thumbnail = XPath.match(elem, "media:thumbnail/@url").to_s
pics << picture
end
end
end
Version data entries
14 entries across 14 versions & 2 rubygems