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module OpenTox
class Feature
include OpenTox
attr_accessor :subjectid
# Find a feature
# @param [String] uri Feature URI
# @return [OpenTox::Task] Feature object
def self.find(uri, subjectid=nil)
return nil unless uri
feature = Feature.new uri
if (CONFIG[:json_hosts].include?(URI.parse(uri).host))
feature.add_metadata YAML.load(RestClientWrapper.get(uri,{:accept => "application/x-yaml", :subjectid => subjectid}))
else
feature.add_metadata Parser::Owl::Dataset.new(uri).load_metadata
end
feature.subjectid = subjectid
feature
end
# provides feature type, possible types are "regression" or "classification"
# @return [String] feature type, unknown if OT.isA property is unknown/ not set
def feature_type
raise OpenTox::BadRequestError.new("rdf type of feature '"+uri.to_s+"' not set") unless metadata[RDF.type]
if metadata[RDF.type].to_a.flatten.include?(OT.NominalFeature)
"classification"
elsif metadata[RDF.type].to_a.flatten.include?(OT.NumericFeature)
"regression"
elsif metadata[OWL.sameAs]
metadata[OWL.sameAs].each do |f|
begin
type = Feature.find(f, subjectid).feature_type
return type unless type=="unknown"
rescue => ex
LOGGER.warn "could not load same-as-feature '"+f.to_s+"' for feature '"+uri.to_s+"' : "+ex.message.to_s
end
end
"unknown"
else
"unknown"
end
end
end
# Get OWL-DL representation in RDF/XML format
# @return [application/rdf+xml] RDF/XML representation
def to_rdfxml
s = Serializer::Owl.new
s.add_feature(@uri,@metadata)
@metadata.values.grep(/model\/\d+$/).each{ |m| s.add_uri(m,OT.Model)}
@metadata.values.grep(/feature/).each{ |f| s.add_uri(f,OT.Feature)}
#s.add_parameters(@uri,@parameters) if @parameters
s.to_rdfxml
end
end
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