Implements Technical Metadata. Fixes #16

lib/hydra/pcdm.rb

@@ -3,6 +3,8 @@ module PCDM
 
     # vocabularies
     autoload :RDFVocabularies,        'hydra/pcdm/vocab/pcdm_terms'
+    autoload :EBUCoreVocabularies,    'hydra/pcdm/vocab/ebucore_terms'
+    autoload :SweetjplVocabularies,   'hydra/pcdm/vocab/sweetjpl_terms'
 
     # models
     autoload :Collection,             'hydra/pcdm/models/collection'

lib/hydra/pcdm/models/file.rb

@@ -5,6 +5,16 @@ class File < ActiveFedora::File
     metadata do
       configure type: RDFVocabularies::PCDMTerms.File
       property :label, predicate: ::RDF::RDFS.label
+
+      property :file_name, predicate: EBUCoreVocabularies::EBUCoreTerms.filename 
+      property :file_size, predicate: EBUCoreVocabularies::EBUCoreTerms.fileSize 
+      property :date_created, predicate: EBUCoreVocabularies::EBUCoreTerms.dateCreated
+      property :has_mime_type, predicate: EBUCoreVocabularies::EBUCoreTerms.hasMimeType
+      property :date_modified, predicate: EBUCoreVocabularies::EBUCoreTerms.dateModified
+      property :byte_order, predicate: SweetjplVocabularies::SweetjplTerms.byteOrder
+
+      # This is a server-managed predicate which means Fedora does not let us change it.
+      property :file_hash, predicate: RDF::Vocab::PREMIS.hasMessageDigest
     end
   end
 end

lib/hydra/pcdm/vocab/ebucore_terms.rb

@@ -0,0 +1,33 @@
+require 'rdf'
+module EBUCoreVocabularies
+  class EBUCoreTerms < RDF::StrictVocabulary("http://www.ebu.ch/metadata/ontologies/ebucore/ebucore#")
+    # Property definitions
+    property :filename,
+      comment: ["The name of the file containing the Resource.".freeze],
+      domain: "ebucore:Resource".freeze,
+      range: "xsd:string".freeze,
+      label: "File Name".freeze
+
+    property :fileSize,
+      comment: ["Size of a MediaResource in bytes.".freeze],
+      domain: "ebucore:Resource".freeze,
+      range: "xsd:integer".freeze,
+      label: "File Size".freeze
+
+    property :dateCreated,
+      comment: ["The date of creation of the media resource.".freeze],
+      domain: "ebucore:Resource".freeze,
+      range: "xsd:dateTime".freeze,
+      label: "Date Created".freeze
+
+    property :hasMimeType,
+      comment: ["Has Mime Type.".freeze],
+      range: "xsd:string".freeze,
+      label: "Has Mime Type".freeze
+
+    property :dateModified,
+      comment: ["To indicate the date at which the media resource has been modified.".freeze],
+      range: "xsd:dateTime".freeze,
+      label: "Date Modified".freeze  
+  end
+end

lib/hydra/pcdm/vocab/sweetjpl_terms.rb

@@ -0,0 +1,10 @@
+require 'rdf'
+module SweetjplVocabularies
+  class SweetjplTerms < RDF::StrictVocabulary("http://sweet.jpl.nasa.gov/2.2/reprDataFormat.owl#")
+    # Property definitions
+    property :byteOrder,
+      comment: ["Byte Order.".freeze],
+      range: "xsd:string".freeze,      
+      label: "Byte Order".freeze
+  end
+end

spec/hydra/pcdm/models/file_spec.rb

@@ -22,4 +22,35 @@
       expect(reloaded.label).to eq ['foo']
     end
   end
+
+  describe "technical metadata" do
+    let(:date_created) { Date.parse "Fri, 08 May 2015 08:00:00 -0400 (EDT)" }
+    let(:date_modified) { Date.parse "Sat, 09 May 2015 09:00:00 -0400 (EDT)" }
+    let(:content) { "hello world" }
+    let(:file) { Hydra::PCDM::File.new.tap { |ds| ds.content = content } }
+    it "saves technical metadata" do
+      file.file_name = "picture.jpg"
+      file.file_size = content.length.to_s
+      file.date_created = date_created
+      file.has_mime_type = "application/jpg"
+      file.date_modified = date_modified
+      file.byte_order = "little-endian"
+      expect(file.save).to be true
+      expect(reloaded.file_name).to eq ["picture.jpg"]
+      expect(reloaded.file_size).to eq [content.length.to_s]
+      expect(reloaded.has_mime_type).to eq ["application/jpg"]
+      expect(reloaded.date_created).to eq [date_created]
+      expect(reloaded.date_modified).to eq [date_modified]
+      expect(reloaded.byte_order).to eq ["little-endian"]
+    end
+
+    it "does not save server managed properties" do
+      # Currently we can't write this property because Fedora 
+      # complains that it's a server managed property. This test 
+      # is mostly to document this situation.
+      file.file_hash = "the-hash"
+      expect{file.save}.to raise_error(Ldp::BadRequest)
+    end
+  end
+
 end

spec/spec_helper.rb

@@ -33,4 +33,4 @@
       ActiveFedora::Cleaner.clean!
     end
   end
-end
+end