Class: JSON::LD::Resource

Inherits:
Object show all
Includes:
RDF::Enumerable
Defined in:
vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb

Overview

Simple Ruby reflector class to provide native access to JSON-LD objects

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from RDF::Enumerable

add_entailment, #dump, #each_graph, #each_object, #each_predicate, #each_quad, #each_statement, #each_subject, #each_term, #each_triple, #entail, #enum_graph, #enum_object, #enum_predicate, #enum_quad, #enum_statement, #enum_subject, #enum_term, #enum_triple, #graph_names, #has_graph?, #has_object?, #has_predicate?, #has_quad?, #has_statement?, #has_subject?, #has_term?, #has_triple?, #invalid?, #objects, #predicates, #project_graph, #quads, #respond_to_missing?, #statements, #subjects, #supports?, #terms, #to_a, #to_h, #to_set, #triples, #valid?, #validate!

Methods included from RDF::Util::Aliasing::LateBound

#alias_method

Methods included from RDF::Isomorphic

#bijection_to, #isomorphic_with?

Methods included from RDF::Countable

#count, #empty?

Constructor Details

#initialize(node_definition, options = {}) ⇒ Resource

A new resource from the parsed graph

Parameters:

Options Hash (options):

  • :context (String)

    Resource context, used for finding appropriate collection and JSON-LD context.

  • :clean (Boolean) — default: false
  • :compact (Boolean) — default: false

    Assume node_definition is in expanded form and compact using context.

  • :reconciled (Boolean) — default: !new

    node_definition is not based on Mongo IDs and must be reconciled against Mongo, or merged into another resource.

  • :new (Boolean) — default: true

    This is a new resource, not yet saved to Mongo

  • :stub (Boolean) — default: false

    This is a stand-in for another resource that has not yet been retrieved (or created) from Mongo



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 79

def initialize(node_definition, options = {})
  @context = options[:context]
  @clean = options.fetch(:clean, false)
  @new = options.fetch(:new, true)
  @reconciled = options.fetch(:reconciled, !@new)
  @resolved = false
  @attributes = if options[:compact]
    JSON::LD::API.compact(node_definition, @context)
  else
    node_definition
  end
  @id = @attributes['@id']
  @anon = @id.nil? || @id.to_s.start_with?('_:')
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args) ⇒ Object

Access individual fields, from subject definition



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 218

def method_missing(method, *args)
  property(method.to_s)
end

Instance Attribute Details

#attributesHash<String => Object] Object representation of resource (readonly)

Returns Hash Object] Object representation of resource

Returns:

  • (Hash<String => Object] Object representation of resource)

    Hash Object] Object representation of resource



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 10

def attributes
  @attributes
end

#contextJSON::LD::Context (readonly)

Returns Context associated with this resource

Returns:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 16

def context
  @context
end

#idString (readonly)

Returns ID of this resource

Returns:

  • (String)

    ID of this resource



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 13

def id
  @id
end

Instance Method Details

#anonymous?Boolean

Anonymous resources have BNode ids or no schema:url

Returns:

  • (Boolean)


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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 47

def anonymous?; @anon; end

#clean?Boolean

Is this resource clean (i.e., saved to mongo?)

Returns:

  • (Boolean)


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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 22

def clean?; @clean; end

#deresolveHash

Reverse resolution of resource attributes. Just returns attributes if resource is unresolved. Otherwise, replaces Resource values with node references.

Result is expanded and re-compacted to get to normalized representation.

Returns:

  • (Hash)

    deresolved attribute hash



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 111

def deresolve
  node_definition = if resolved?
    deresolved = [].tap do |memo|
      attributes.each_pair do |prop, value|
        memo[prop] = case value
        when Resource
          {'id' => value.id}
        when Array
          value.map do |v|
            v.is_a?(Resource) ? {'id' => v.id} : v
          end
        else
          value
        end
      end
    end
    deresolved
  else
    attributes
  end

  compacted = nil
  JSON::LD::API.expand(node_definition, expandContext: @context) do |expanded|
    compacted = JSON::LD::API.compact(expanded, @context)
  end
  compacted.delete_if {|k, v| k == '@context'}
end

#dirty?Boolean

Is this resource dirty (i.e., not yet saved to mongo?)

Returns:

  • (Boolean)


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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 28

def dirty?; !clean?; end

#each(&block) ⇒ Object

Enumerate over statements associated with this resource



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 151

def each(&block)
  JSON::LD::API.toRdf(attributes, expandContext: context, &block)
end

#hashInteger

Return a hash of this object, suitable for use by for ETag

Returns:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 97

def hash
  self.deresolve.hash
end

#inspectObject



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 222

def inspect
  "<Resource" +
  attributes.map do |k, v|
    "\n  #{k}: #{v.inspect}"
  end.join(" ") +
  ">"
end

#new?Boolean

Is this a new resource, which has not yet been synched or created within the DB?

Returns:

  • (Boolean)


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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 57

def new?; !!@new; end

#property(prop_name) ⇒ Object

Access individual fields, from subject definition



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 214

def property(prop_name); @attributes.fetch(prop_name, nil); end

#reconciled?Boolean

Has this resource been reconciled against a mongo ID?

Returns:

  • (Boolean)


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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 34

def reconciled?; @reconciled; end

#resolve(reference_map) ⇒ Resource

Update node references using the provided map. This replaces node references with Resources, either stub or instantiated.

Node references with ids not in the reference_map will cause stub resources to be added to the map.

Parameters:

Returns:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 165

def resolve(reference_map)
  return if resolved?
  def update_obj(obj, reference_map)
    case obj
    when Array
      obj.map {|o| update_obj(o, reference_map)}
    when Hash
      if node_reference?(obj)
        reference_map[obj['id']] ||= Resource.new(obj,
          context: @context_name,
          clean: false,
          stub: true
          )
      else
        obj.each_key do |k|
          obj[k] = update_obj(obj[k], reference_map)
        end
        obj
      end
    else
      obj
    end
  end

  #$logger.debug "resolve(0): #{attributes.inspect}"
  @attributes.each do |k, v|
    next if k == 'id' || k == 'type'
    @attributes[k] = update_obj(@attributes[k], reference_map)
  end
  #$logger.debug "resolve(1): #{attributes.inspect}"
  @resolved = true
  self
end

#resolved?Boolean

Has this resource been resolved so that all references are to other Resources?

Returns:

  • (Boolean)


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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 41

def resolved?; @resolved; end

#saveBoolean

Override this method to implement save using an appropriate storage mechanism.

Save the object to the Mongo collection use Upsert to create things that don't exist. First makes sure that the resource is valid.

Returns:

  • (Boolean)

    true or false if resource not saved

Raises:

  • (NotImplementedError)


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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 208

def save
  raise NotImplementedError
end

#stub?Boolean

Is this a stub resource, which has not yet been synched or created within the DB?

Returns:

  • (Boolean)


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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 52

def stub?; !!@stub; end

#to_json(options = nil) ⇒ String

Serialize to JSON-LD, minus @context using a deresolved version of the attributes

Parameters:

  • options (Hash) (defaults to: nil)

Returns:

  • (String)

    serizlied JSON representation of resource



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 145

def to_json(options = nil)
  deresolve.to_json(options)
end

#update_obj(obj, reference_map) ⇒ Object



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/json-ld-4e9cdb2fc35e/lib/json/ld/resource.rb', line 167

def update_obj(obj, reference_map)
  case obj
  when Array
    obj.map {|o| update_obj(o, reference_map)}
  when Hash
    if node_reference?(obj)
      reference_map[obj['id']] ||= Resource.new(obj,
        context: @context_name,
        clean: false,
        stub: true
        )
    else
      obj.each_key do |k|
        obj[k] = update_obj(obj[k], reference_map)
      end
      obj
    end
  else
    obj
  end
end