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module RDFMapper
class << self
def to_rdf(obj)
mapping = obj.rdf_mapping
uri = obj.uri
data = "<#{uri}>\n" unless mapping.empty?
data = self.parse_mapping(data, mapping, obj)
if (doc_uri = obj.doc_uri) && (obj.respond_to? :updated_at) && (obj.respond_to? :created_at)
data += "<#{doc_uri}> a foaf:Document; dc:created \"#{obj.created_at.iso8601}\"^^xsd:dateTime; dc:modified \"#{obj.updated_at.iso8601}\"^^xsd:dateTime .\n\n"
end
data
end
def parse_mapping(data, mapping, obj)
unless mapping.empty?
data += "a #{mapping[:type]};\n"
mapping.keys.each do |key|
unless key == :type
if (value = obj.send(key)) && (value != "") && (value.class != Array)
value = self.rdf_value(value, obj)
if mapping[key].class != Array
data += "#{mapping[key]} #{value};\n" unless key == :type
else
mapping[key].each do |k|
data += "#{k} #{value};\n" unless key == :type
end
end
elsif value.class == Array
value.each do |v|
v = self.rdf_value(v, obj)
data += "#{mapping[key]} #{v};\n" unless key == :type
end
end
end
end
data = data[0, data.length - 2] + ".\n\n" # Getting rid of the previous ;
end
end
def rdf_value(value, obj)
if value.class == String
value = value.gsub('"', '\"')
value = "\"\"\"#{value}\"\"\"^^xsd:string"
elsif value.class == Fixnum
value = "\"#{value}\"^^xsd:int"
elsif value.class == Float
value = "\"#{value}\"^^xsd:float"
elsif value.class == URI::HTTP
value = "<#{value.to_s}>"
elsif value.class == Hash
data = parse_mapping("", value, obj)
data = data[0, data.length - 3] # Removing the last .
value = "[ #{data} ]"
elsif value.class == Date
value = "\"#{value.to_s}\"^^xsd:date"
elsif value.class == DateTime
value = "\"#{value.to_s}\"^^xsd:dateTime"
elsif value.class == Time
value = "\"#{value.iso8601}\"^^xsd:dateTime"
elsif value_uri = value.uri
value = "<#{value_uri}>"
end
value
end
end
end
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