Add RDF.Graph.base_iri/1 and RDF.Graph.prefixes/1

CHANGELOG.md

@@ -9,8 +9,14 @@ This project adheres to [Semantic Versioning](http://semver.org/) and
 
 ### Added
 
-- `RDF.Description.subject/1` and `RDF.Description.change_subject/2`
-- `RDF.Graph.name/1` and `RDF.Graph.change_name/2`
+- to `RDF.Description`
+    - `RDF.Description.subject/1` 
+    - `RDF.Description.change_subject/2`
+- to `RDF.Graph`
+    - `RDF.Graph.name/1` 
+    - `RDF.Graph.change_name/2`
+    - `RDF.Graph.base_iri/1` 
+    - `RDF.Graph.prefixes/1`
 
 ### Changed
 

lib/rdf/graph.ex

@@ -901,6 +901,12 @@ defmodule RDF.Graph do
 
   def equal?(_, _), do: false
 
+  @doc """
+  Returns the prefixes of the given `graph` as a `RDF.PrefixMap`.
+  """
+  @spec prefixes(t) :: PrefixMap.t() | nil
+  def prefixes(%__MODULE__{} = graph), do: graph.prefixes
+
   @doc """
   Adds `prefixes` to the given `graph`.
 
@@ -955,6 +961,12 @@ defmodule RDF.Graph do
     %__MODULE__{graph | prefixes: nil}
   end
 
+  @doc """
+  Returns the base IRI of the given `graph`.
+  """
+  @spec base_iri(t) :: IRI.t() | nil
+  def base_iri(%__MODULE__{} = graph), do: graph.base_iri
+
   @doc """
   Sets the base IRI of the given `graph`.
 

test/unit/graph_test.exs

@@ -810,6 +810,11 @@ defmodule RDF.GraphTest do
            |> Graph.equal?(Graph.new({EX.S, EX.p(), EX.O}, name: EX.Graph2))
   end
 
+  test "prefixes/1" do
+    assert Graph.prefixes(graph()) == nil
+    assert %Graph{prefixes: PrefixMap.new()} |> Graph.prefixes() == PrefixMap.new()
+  end
+
   describe "add_prefixes/2" do
     test "when prefixes already exist" do
       graph = Graph.new(prefixes: %{xsd: XSD}) |> Graph.add_prefixes(ex: EX)
@@ -857,6 +862,13 @@ defmodule RDF.GraphTest do
     assert Graph.clear_prefixes(Graph.new(prefixes: %{ex: EX})) == Graph.new()
   end
 
+  test "base_iri/1" do
+    assert Graph.base_iri(graph()) == nil
+
+    assert %Graph{base_iri: ~I<http://example.com/>} |> Graph.base_iri() ==
+             ~I<http://example.com/>
+  end
+
   describe "set_base_iri/1" do
     test "when given an IRI" do
       graph = Graph.new() |> Graph.set_base_iri(~I<http://example.com/>)