Class: Query2Jars2

Inherits:
Object
  • Object
show all
Defined in:
lib/active_rdf/queryengine/query2jars2.rb

Overview

Translates abstract query into jars2 query. (ignores ASK queries)

Class Method Summary collapse

Class Method Details

.translate(query) ⇒ Object 



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# File 'lib/active_rdf/queryengine/query2jars2.rb', line 6

def self.translate(query)
	str = ""
	if query.select?
		# concatenate each where clause using space: s p o
		# and then concatenate the clauses using dot: s p o . s2 p2 o2 .
		str << "#{query.where_clauses.collect{|w| w.collect{|w| '?'+w.to_s}.join(' ')}.join(" .\n")} ."
		# TODO: should we maybe reverse the order on the where_clauses? it depends 
		# on Andreas' answer of the best order to give to jars2. Users would 
		# probably put the most specific stuff first, and join to get the 
		# interesting information. Maybe we should not touch it and let the user 
		# figure it out.
	end
	
	$activerdflog.debug "Query2Jars2: translated #{query} to #{str}"
	return str
end