Class: Pho::RDF::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/pho/rdf.rb

Overview

General RDF parsing utilities.

Currently a convenience wrapper around the Redland Ruby bindings

Class Method Summary collapse

Class Method Details

.parse_ntriples(file, base_uri = nil) ⇒ Object

Parse a file containing ntriples into RDF/XML. Returns a string

file

File object

base_uri

optional base uri to be used when parsing. If not set, then uris are resolved

relative to the File



24
25
26
27
28
29
30
31
32
33
 
# File 'lib/pho/rdf.rb', line 24

def Parser.parse_ntriples(file, base_uri=nil)
  model = Redland::Model.new()
  parser = Redland::Parser.new("ntriples", "")
  uri = "file:#{file.path}"
  base_uri = uri unless base_uri
  parser.parse_into_model(model, uri, base_uri)
  serializer = Redland::Serializer.new( "rdfxml", "application/rdf+xml" )
  data = serializer.model_to_string(Redland::Uri.new(base_uri), model)
  return data                        
end

.parse_ntriples_from_string(string, base_uri) ⇒ Object

Parse a string containing ntriples into RDF/XML. Returns a string

string

the string containing the data

base_uri

base uri for parsing the data



39
40
41
42
43
44
45
46
 
# File 'lib/pho/rdf.rb', line 39

def Parser.parse_ntriples_from_string(string, base_uri)
  model = Redland::Model.new()
  parser = Redland::Parser.new("ntriples", "")
  parser.parse_string_into_model(model, string, Redland::Uri.new(base_uri))
  serializer = Redland::Serializer.new( "rdfxml", "application/rdf+xml" )
  data = serializer.model_to_string(Redland::Uri.new(base_uri), model)
  return data                                
end

.store_ntriples(file, store, base_uri = nil, graph_name = nil) ⇒ Object

Convenience method to parse an ntriples file and store it a Platform store

file

the file to parse

store

the store to receive the data

base_uri

base uri against which the data is parsed

graph_name

uri of graph in store

TODO: can now be submitted as turtle



55
56
57
58
 
# File 'lib/pho/rdf.rb', line 55

def Parser.store_ntriples(file, store, base_uri=nil, graph_name=nil)
   data = Parser.parse_ntriples(file, base_uri)
   return store.store_data(data, graph_name)       
end

.store_ntriples_from_string(string, store, base_uri, graph_name = nil) ⇒ Object

Convenience method to parse an ntriples string and store it a Platform store

string

the data to parse

store

the store to receive the data

base_uri

base uri against which the data is parsed

graph_name

uri of graph in store

TODO: can now be submitted as turtle



67
68
69
70
 
# File 'lib/pho/rdf.rb', line 67

def Parser.store_ntriples_from_string(string, store, base_uri, graph_name=nil)
   data = Parser.parse_ntriples_from_string(string, base_uri)
   return store.store_data(data, graph_name)       
end