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Contents
module RDF
class Graph
# Resource properties
#
# Properties arranged as a hash with the predicate Term as index to an array of resources or literals
#
# Example:
# graph.load(':foo a :bar; rdfs:label "An example" .', "http://example.com/")
# graph.resources(URI.new("http://example.com/subject")) =>
# {
# "http://www.w3.org/1999/02/22-rdf-syntax-ns#type" => [<http://example.com/#bar>],
# "http://example.com/#label" => ["An example"]
# }
def properties(subject, recalc = false)
@properties ||= {}
@properties.delete(subject.to_s) if recalc
@properties[subject.to_s] ||= begin
hash = Hash.new
self.query(:subject => subject) do |statement|
pred = statement.predicate.to_s
hash[pred] ||= []
hash[pred] << statement.object
end
hash
end
end
# Get type(s) of subject, returns a list of symbols
def type_of(subject)
query(:subject => subject, :predicate => RDF.type).map {|st| st.object}
end
end
end
Version data entries
44 entries across 44 versions & 5 rubygems