Use RDF.read_file/1 in RDF.Vocabulary.Namespace

CHANGELOG.md

@@ -13,6 +13,10 @@ This project adheres to [Semantic Versioning](http://semver.org/) and
   `RDF.Serialization` module contains just simple RDF serialization related functions 
 - renamed `RDF.Serialization.Format.content_type/0` to `RDF.Serialization.Format.media_type/0`
 - moved `RDF.Reader` and `RDF.Writer` into `RDF.Serialization` module 
+- removed the limitation to serialization formats defined in the core RDF.ex package
+  for use as a source of `RDF.Vocabulary.Namespace`s; so you can now also define
+  vocabulary namespaces from JSON-LD files for example, provided that the corresponding 
+  Hex package is defined as a dependency  
 
 
 ### Added

lib/rdf/vocabulary_namespace.ex

@@ -176,7 +176,7 @@ defmodule RDF.Vocabulary.Namespace do
 
   defp source!(opts) do
     cond do
-      Keyword.has_key?(opts, :file)        -> {:data, filename!(opts) |> load_file}
+      Keyword.has_key?(opts, :file)        -> {:data, filename!(opts) |> RDF.read_file!()}
       rdf_data = Keyword.get(opts, :data)  -> {:data, raw_rdf_data(rdf_data)}
       terms    = Keyword.get(opts, :terms) -> {:terms, terms_from_user_input!(terms)}
       true ->
@@ -519,18 +519,6 @@ defmodule RDF.Vocabulary.Namespace do
     end
   end
 
-  defp load_file(file) do
-    # TODO: support other formats
-    cond do
-      String.ends_with?(file, ".nt")  -> RDF.NTriples.read_file!(file)
-      String.ends_with?(file, ".nq")  -> RDF.NQuads.read_file!(file)
-      String.ends_with?(file, ".ttl") -> RDF.Turtle.read_file!(file)
-      true ->
-        raise ArgumentError,
-          "unsupported file type for #{file}: vocabulary namespaces can currently be created from NTriple, NQuad and Turtle files"
-    end
-  end
-
   defp rdf_data_env do
     import RDF.Sigils
     __ENV__