Support schemas via lib/linked_data_fragments

This is the first step in a refactoring to move schemas to lib. Adds
tests for the schemas.

lib/linked_data_fragments.rb

@@ -0,0 +1,14 @@
+require 'active_triples'
+
+# must require 'rdf/vocab' first, due to const_missing metaprogramming in 
+# pre-2.0 verisons
+require 'rdf/vocab' 
+require 'rdf/vocab/hydra'
+require 'rdf/vocab/void'
+
+require 'linked_data_fragments/schemas'
+
+##
+# A linked data caching fragment
+module LinkedDataFragments
+end

lib/linked_data_fragments/schemas.rb

@@ -0,0 +1,4 @@
+require 'linked_data_fragments/schemas/control_schema'
+require 'linked_data_fragments/schemas/dataset_schema'
+require 'linked_data_fragments/schemas/result_schema'
+require 'linked_data_fragments/schemas/template_schema'

lib/linked_data_fragments/schemas/control_schema.rb

@@ -0,0 +1,8 @@
+module LinkedDataFragments
+  ##
+  # A HydraCore control schema
+  class ControlSchema < ActiveTriples::Schema
+    property :variable, :predicate => RDF::Vocab::HYDRA.variable
+    property :property, :predicate => RDF::Vocab::HYDRA.property, :cast => false
+  end
+end

lib/linked_data_fragments/schemas/dataset_schema.rb

@@ -0,0 +1,12 @@
+module LinkedDataFragments
+  ##
+  # A schema for `hydracore:Collection`/`Dataset` nodes.
+  class DatasetSchema < ActiveTriples::Schema
+    property :subset,              predicate: RDF::VOID.subset
+    property :uri_lookup_endpoint, predicate: RDF::VOID.uriLookupEndpoint
+
+    # Change search so that it points to a search node.
+    property :search, predicate: RDF::URI.intern("http://www.w3.org/ns/hydra/core#search")
+    property :member, predicate: RDF::URI.intern("http://www.w3.org/ns/hydra/core#member")
+  end
+end

lib/linked_data_fragments/schemas/result_schema.rb

@@ -0,0 +1,19 @@
+module LinkedDataFragments
+  ##
+  # Schema for Result model
+  class ResultSchema < ActiveTriples::Schema
+    property :subset,      :predicate => RDF::VOID.subset
+
+    # Descriptive
+    property :title,       :predicate => RDF::Vocab::DC.title
+    property :description, :predicate => RDF::Vocab::DC.description
+    property :source,      :predicate => RDF::Vocab::DC.source
+
+    # Pagination
+    property :triples_count,  :predicate => RDF::Vocab::VOID.triples
+    property :total_items,    :predicate => RDF::URI("http://www.w3.org/ns/hydra/core#totalItems")
+    property :items_per_page, :predicate => RDF::URI("http://www.w3.org/ns/hydra/core#itemsPerPage")
+    property :first_page,     :predicate => RDF::URI("http://www.w3.org/ns/hydra/core#firstPage")
+  end
+end
+

lib/linked_data_fragments/schemas/template_schema.rb

@@ -0,0 +1,8 @@
+module LinkedDataFragments
+  ##
+  # Schema for template models
+  class TemplateSchema < ActiveTriples::Schema
+    property :template, :predicate => RDF::Vocab::HYDRA.search
+    property :mapping,  :predicate => RDF::Vocab::HYDRA.mapping
+  end
+end

spec/linked_data_fragments/schemas/control_schema_spec.rb

@@ -0,0 +1,5 @@
+require 'spec_helper'
+
+describe LinkedDataFragments::ControlSchema do
+  it_behaves_like 'a schema', [:variable, :property]
+end

spec/linked_data_fragments/schemas/dataset_schema_spec.rb

@@ -0,0 +1,5 @@
+require 'spec_helper'
+
+describe LinkedDataFragments::DatasetSchema do
+  it_behaves_like 'a schema', [:subset, :uri_lookup_endpoint, :search, :member]
+end

spec/linked_data_fragments/schemas/result_schema_spec.rb

@@ -0,0 +1,13 @@
+require 'spec_helper'
+
+describe LinkedDataFragments::ResultSchema do
+  it_behaves_like 'a schema', [:subset, 
+                               :title, 
+                               :description, 
+                               :source,
+                               :triples_count,
+                               :total_items,
+                               :items_per_page,
+                               :first_page
+                              ]
+end

spec/linked_data_fragments/schemas/template_schema_spec.rb

@@ -0,0 +1,5 @@
+require 'spec_helper'
+
+describe LinkedDataFragments::TemplateSchema do
+  it_behaves_like 'a schema', [:template, :mapping]
+end

spec/spec_helper.rb

@@ -1,4 +1,5 @@
 require 'vcr_setup'
+require 'linked_data_fragments'
 
 Dir['./spec/support/**/*.rb'].each { |f| require f }
 

spec/support/shared_examples/schema.rb

@@ -0,0 +1,18 @@
+shared_examples 'a schema' do |properties|
+  let(:fake_source) do
+    klass = Class.new { include ActiveTriples::RDFSource }
+    klass.apply_schema described_class
+    klass
+  end
+
+  let(:source) { fake_source.new }
+  let(:value)  { :moomin }
+
+  properties.each do |property|
+    it "has configured property #{property}" do
+      expect { source.send("#{property}=".to_sym, value) }
+        .to change { source.send(property).to_a }
+              .to contain_exactly(value)
+    end
+  end
+end