Class: Triannon::IIIFAnnoList

Inherits:
Object
  • Object
show all
Defined in:
lib/triannon/iiif_anno_list.rb

Constant Summary collapse

ANNO_LIST_FRAME =

from iiif.io/api/presentation/2/annotationList_frame.json

JSON.parse('
{
    "@context" : "http://iiif.io/api/presentation/2/context.json",
    "@type": "sc:AnnotationList",
    "resources": [{
        "@type": "oa:Annotation",
        "on" : [{
            "@embed" : false
        }]
    }]
}')
ANNO_FRAME =

from iiif.io/api/presentation/2/annotation_frame.json

JSON.parse('
{
  "@context" : "http://iiif.io/api/presentation/2/context.json",
  "@type": "oa:Annotation",
  "on" : [{
      "@embed" : false
  }]
}')

Class Method Summary collapse

Class Method Details

.anno_list(tgraph_array) ⇒ Hash

take an Array of annos as OA::Graph objects and return a Hash representation

of IIIF Annotation List

Parameters:

  • tgraph_array (Array<OA::Graph>) —

    annotations as OA::Graph objects

Returns:

  • (Hash) —

    IIIF Annotation List as a Hash, containing the annotations in the array



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# File 'lib/triannon/iiif_anno_list.rb', line 34

def self.anno_list(tgraph_array)
  if tgraph_array
    result = {
      "@context" => OA::Graph::IIIF_CONTEXT_URL,
      "@type" => "sc:AnnotationList",
      "within" => {"@type" => "sc:Layer", "total" => tgraph_array.size },
      "resources" => tgraph_array.map { |g|
        embedded_body = JSON::LD::API.frame(JSON.parse(g.jsonld_iiif), ANNO_FRAME)
        resource = embedded_body["@graph"]
        if resource.is_a?(Array) && resource.size == 1
          resource = resource.first
        end
        resource
      }
    }

    # remove context from each anno as it is redundant
    result["resources"].each { |anno_hash|
      anno_hash.delete("@context")
    }
    result
  end
end