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Contents
module RDF
##
# An RDF query mixin.
#
# Classes that include this module must implement an `#each` method that
# yields {RDF::Statement RDF statements}.
#
# @see RDF::Graph
# @see RDF::Repository
module Queryable
include ::Enumerable
##
# Queries `self` for RDF statements matching the given pattern.
#
# @example
# queryable.query([nil, RDF::DOAP.developer, nil])
# queryable.query(:predicate => RDF::DOAP.developer)
#
# @param [Query, Statement, Array(Value), Hash] pattern
# @yield [statement]
# @yieldparam [Statement]
# @return [Array<Statement>]
def query(pattern, &block)
raise TypeError.new("#{self} is not readable") if respond_to?(:readable) && !readable?
case pattern
when Query
pattern.execute(self, &block)
when Array
query(Statement.new(*pattern), &block)
when Hash
query(Statement.new(pattern), &block)
when Statement
if block_given?
find_all { |statement| pattern === statement }.each(&block)
else
find_all { |statement| pattern === statement }.extend(RDF::Enumerable, RDF::Queryable)
end
else
raise ArgumentError.new("expected RDF::Query, RDF::Pattern, Array or Hash, but got #{pattern.inspect}")
end
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems