Class: RedGrape::Serializer::GraphMLSerializer

Inherits:
Object
  • Object
show all
Defined in:
lib/red_grape/serializer/graphml_serializer.rb

Constant Summary collapse

NAMESPACES = 
{
  'xmlns' => 'http://graphml.graphdrawing.org/xmlns',
  'xsi' => 'http://www.w3.org/2001/XMLSchema-instance'
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(graph) ⇒ GraphMLSerializer

Returns a new instance of GraphMLSerializer.



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# File 'lib/red_grape/serializer/graphml_serializer.rb', line 13

def initialize(graph)
  @graph = graph
end

Instance Attribute Details

#graph ⇒ Object (readonly)

Returns the value of attribute graph.



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# File 'lib/red_grape/serializer/graphml_serializer.rb', line 11

def graph
  @graph
end

Instance Method Details

#load(filename) ⇒ Object 



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# File 'lib/red_grape/serializer/graphml_serializer.rb', line 17

def load(filename)
  if filename =~ /^<\?xml/
    parse_xml Nokogiri::XML(filename)
  else
    File.open(filename, 'r') do |file|
      parse_xml Nokogiri::XML(file)
    end
  end
  @graph
end

#nodes(xml, elm) ⇒ Object 



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# File 'lib/red_grape/serializer/graphml_serializer.rb', line 65

def nodes(xml, elm)
  xml.xpath(".//xmlns:#{elm}", NAMESPACES)
end

#parse_xml(xml) ⇒ Object

assumption: any sub-graph does not exist.



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# File 'lib/red_grape/serializer/graphml_serializer.rb', line 29

def parse_xml(xml)
  vertices = {}
  edges = {}
  property_descriptions = {}

  nodes(xml, 'key').each do |key_elm|
    defaults = nodes key_elm, 'default'
    default = defaults.size == 0 ? nil : defaults.first.children.to_s
    prop = PropertyDescription.new key_elm['attr.name'], key_elm['attr.type'], default
    (property_descriptions[key_elm['for']] ||= {})[key_elm['id']] = prop
  end
  @graph.instance_variable_set :@property_descriptions, property_descriptions

  nodes(xml, 'node').each do |node_elm|
    vertex = Vertex.new @graph, node_elm['id'], 
      :property_description => property_descriptions['node']
    data = nodes node_elm, 'data'
    data.each do |data_elm|
      vertex.set_property data_elm['key'], data_elm.children.first.to_s
    end
    vertices[vertex.id] = vertex
  end
  @graph.instance_variable_set :@vertices, vertices

  nodes(xml, 'edge').each do |edge_elm|
    edge = Edge.new @graph, edge_elm['id'], edge_elm['source'], edge_elm['target'], 
      edge_elm['label'], :property_description => property_descriptions['edge']
    data = nodes edge_elm, 'data'
    data.each do |data_elm|
      edge.set_property data_elm['key'], data_elm.children.first.to_s
    end
    edges[edge.id] = edge
  end
  @graph.instance_variable_set :@edges, edges
end

#save ⇒ Object 



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# File 'lib/red_grape/serializer/graphml_serializer.rb', line 69

def save
end