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module OpenTox
class Feature
include OpenTox
attr_accessor :subjectid
# Find a feature
# @param [String] uri Feature URI
# @return [OpenTox::Feature] Feature object
def self.find(uri, subjectid=nil)
return nil unless uri
feature = Feature.new uri, subjectid
if (CONFIG[:yaml_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
if metadata[RDF.type].flatten.include?(OT.NominalFeature)
"classification"
elsif metadata[RDF.type].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
end
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