module VORuby
  module VOTables

    module VOTable
      require 'voruby/votables/votable'
      require 'voruby/votables/rexml_parser'

      # A wrapper around VOTable::VOTable that uses ruby's built in rexml library
      # to parse XML.  Typically one would use VOTABLE::TreeParsedVOTable
      # rather than using this class directly.
      #  rexml_votable = VOTable::RexmlParsedVOTable('my_votable.xml')
      #  votable = rexml_votable.votable
      class RexmlParsedVOTable
        attr_reader :path, :votable
    
        # [_path_:]
        #  The path to the VOTable XML file to parse.
        def initialize(path)
          @path = path
          file = File.new(path)
      
          doc = REXML::Document.new(file)
          root = doc.root # Root document
      
          # Attributes
          id = root.attributes['ID'] if root.attributes['ID']
          version = root.attributes['version'] if root.attributes['version']
      
          # Elements
          description =
    		    Meta::Description.from_xml(root.elements.to_a('DESCRIPTION').first) if root.elements['DESCRIPTION']
          definition =
    		    Meta::Definitions.from_xml(root.elements.to_a('DEFINITIONS').first) if root.elements['DEFINITIONS']
      
          coosys = []
          root.elements.each('COOSYS'){ |sys|
            coosys.push(Meta::CooSys.from_xml(sys))
          }
      
          params = []
          root.elements.each('PARAM'){ |param|
            params.push(Meta::Param.from_xml(param))
          }
      
          info = []
          root.elements.each('INFO'){ |inf|
            info.push(Meta::Info.from_xml(inf))
          }
      
          resources = []
          root.elements.each('RESOURCE'){ |res|
            resources.push(Meta::Resource.from_xml(res))
          }

         @votable = VOTable.new(id, version, description, definition, coosys, params, info, resources)
        end
    
        # Convert a RexmlParsedVOTable into a string representation.
        def to_s
          "{file=#{@path};votable=#{@votable}}"
        end
      end

    end
  
  end
end