Class: SemanticCrawler::Gdacs::Feed

Inherits:
Object
  • Object
show all
Defined in:
lib/semantic_crawler/gdacs/feed.rb

Overview

The GDACS.org RSS feed contains the latest crisis information about the following crisis types:

  • Floods

  • Earthquakes

  • Tropical Cyclones

  • Volcanoes

Constant Summary collapse

@@NAMESPACES =

XML namespaces used for the parsing process

{
    "atom" => "http://www.w3.org/2005/Atom"
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(new_url = "http://www.gdacs.org/xml/rss.xml") ⇒ Feed

Initializes the gdacs.org feed URL. If not specified the default URL (www.gdacs.org/xml/rss.xml) is used. Normally the feed URL should not be changed.



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# File 'lib/semantic_crawler/gdacs/feed.rb', line 26

def initialize(new_url = "http://www.gdacs.org/xml/rss.xml")
    @url = new_url
    @root_node = nil
    begin
        fetch_feed
    rescue => e
        $log.error("Not able to get country information, through exception: #{e}")
    end
end

Instance Attribute Details

#url ⇒ Object (readonly)

The gdacs.org RSS feed URL. (default: www.gdacs.org/xml/rss.xml)



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# File 'lib/semantic_crawler/gdacs/feed.rb', line 21

def url
  @url
end

Instance Method Details

Get rss/channel/atom:link



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# File 'lib/semantic_crawler/gdacs/feed.rb', line 67

def atom_link
    query_root_node("atom:link/@href", @@NAMESPACES)
end

#description ⇒ Object

Get rss/channel/description



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# File 'lib/semantic_crawler/gdacs/feed.rb', line 47

def description
    query_root_node("description/text()")
end

#items ⇒ Object

Get rss/channel/item*



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# File 'lib/semantic_crawler/gdacs/feed.rb', line 72

def items
   nodeset = query_root_node("item")
   @items = []
   if !nodeset.nil?
       nodeset.each do |item|
           item_obj = SemanticCrawler::Gdacs::FeedItem.new(item)
           @items << item_obj
       end
   end
   @items
end

#link ⇒ Object

Get rss/channel/link



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# File 'lib/semantic_crawler/gdacs/feed.rb', line 42

def link
    query_root_node("link/text()")
end

#managingEditor ⇒ Object

Get rss/channel/managingEditor



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# File 'lib/semantic_crawler/gdacs/feed.rb', line 62

def managingEditor
    query_root_node("managingEditor/text()")
end

#pubDate ⇒ Object

Get rss/channel/pubDate



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# File 'lib/semantic_crawler/gdacs/feed.rb', line 52

def pubDate
    query_root_node("pubDate/text()")
end

#query_root_node(xpath_query, namespaces = {}) ⇒ Object

Query the root_node



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# File 'lib/semantic_crawler/gdacs/feed.rb', line 85

def query_root_node(xpath_query, namespaces = {})
    if !@root_node.nil?
        @root_node.xpath(xpath_query, namespaces)
    end
end

#title ⇒ Object

Get rss/channel/title



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# File 'lib/semantic_crawler/gdacs/feed.rb', line 37

def title
    query_root_node("title/text()")
end

#webMaster ⇒ Object

Get rss/channel/webMaster



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# File 'lib/semantic_crawler/gdacs/feed.rb', line 57

def webMaster
    query_root_node("webMaster/text()")
end

#xml_document ⇒ Object

Returns the whole RSS feed as XML



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# File 'lib/semantic_crawler/gdacs/feed.rb', line 92

def xml_document
    @root_node.to_s
end