diff options
| author | gebele <gebele@in-silico.ch> | 2013-05-10 17:25:15 +0200 |
|---|---|---|
| committer | gebele <gebele@in-silico.ch> | 2013-05-10 17:25:15 +0200 |
| commit | 88a8b1fe193898c5a0d1cd4640a5495b5f729aa8 (patch) | |
| tree | 8b1d01a35254dc911a7eca4d978a7ca7b27b8695 | |
| parent | 250720086733cbc0d31a2d7b9e585a074dda816a (diff) | |
added new method to check single uri is available in backend
| -rw-r--r-- | lib/4store.rb | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/lib/4store.rb b/lib/4store.rb index 4240879..67297c0 100644 --- a/lib/4store.rb +++ b/lib/4store.rb @@ -15,6 +15,13 @@ module OpenTox query sparql, mime_type end + def self.head uri + sparql = "SELECT DISTINCT ?g WHERE {GRAPH ?g {<#{uri}> <#{RDF::DC.modified}> ?o.} }" + rdf = query sparql, 'application/sparql-results+xml' + resource_not_found_error "#{uri} not found." unless rdf.match("#{uri}") + rdf + end + def self.get uri, mime_type bad_request_error "'#{mime_type}' is not a supported mime type. Please specify one of #{@@accept_formats.join(", ")} in the Accept Header." unless @@accept_formats.include? mime_type sparql = "CONSTRUCT {?s ?p ?o.} FROM <#{uri}> WHERE { ?s ?p ?o. }" @@ -62,7 +69,7 @@ module OpenTox if sparql =~ /SELECT/i # return list unless mime_type case mime_type - when 'application/sparql-results+xml' + when 'application/sparql-results+xml' RestClient.get(sparql_uri, :params => { :query => sparql }, :accept => mime_type).body when 'application/json' RestClient.get(sparql_uri, :params => { :query => sparql }, :accept => mime_type).body @@ -80,7 +87,6 @@ module OpenTox when /html|turtle/ # TODO: fix and improve nt = RestClient.get(sparql_uri, :params => { :query => sparql }, :accept => "text/plain").body # 4store returns ntriples for turtle - rdf = RDF::Graph.new RDF::Reader.for(:ntriples).new(nt) do |reader| reader.each_statement { |statement| rdf << statement } @@ -88,7 +94,7 @@ module OpenTox prefixes = {:rdf => "http://www.w3.org/1999/02/22-rdf-syntax-ns#type"} ['OT', 'DC', 'XSD', 'OLO'].each{|p| prefixes[p.downcase.to_sym] = eval("RDF::#{p}.to_s") } # TODO: fails for large datasets?? multi_cell_call - turtle = RDF::N3::Writer.for(:turtle).buffer(:prefixes => prefixes) do |writer| + turtle = RDF::Turtle::Writer.for(:turtle).buffer(:prefixes => prefixes) do |writer| rdf.each{|statement| writer << statement} end regex = Regexp.new '(https?:\/\/[\S]+)([>"])' |