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RDF::Graph existence test methods generate unnecessary work #452

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May 12, 2025
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RDF::Graph existence test methods generate unnecessary work #452

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32 changes: 31 additions & 1 deletion lib/rdf/model/graph.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,7 @@ module RDF
#
# @example Loading graph data from a URL
# require 'rdf/rdfxml' # for RDF/XML support
#
#
# graph = RDF::Graph.load("http://www.bbc.co.uk/programmes/b0081dq5.rdf")
#
# @example Accessing a specific named graph within a {RDF::Repository}
Expand Down Expand Up @@ -250,6 +250,36 @@ def statement?(*args)
end
alias_method :has_statement?, :statement?

##
# Returns `true` if `self` contains the given RDF subject term.
#
# @param [RDF::Resource] value
# @return [Boolean]
def subject? value
[email protected]({ subject: value, graph_name: graph_name || false }).empty?
end
alias_method :has_subject?, :subject?

##
# Returns `true` if `self` contains the given RDF predicate term.
#
# @param [RDF::URI] value
# @return [Boolean]
def predicate? value
[email protected]({ predicate: value, graph_name: graph_name || false }).empty?
end
alias_method :has_predicate?, :predicate?

##
# Returns `true` if `self` contains the given RDF object term.
#
# @param [RDF::Term] value
# @return [Boolean]
def object? value
[email protected]({ object: value, graph_name: graph_name || false }).empty?
end
alias_method :has_object?, :object?

##
# Enumerates each RDF statement in this graph.
#
Expand Down