Class: URIResolver::URIResolverImplementation

Inherits:
Object
  • Object
show all
Defined in:
backend/app/lib/uri_resolver.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(properties_to_resolve) ⇒ URIResolverImplementation

Returns a new instance of URIResolverImplementation.



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# File 'backend/app/lib/uri_resolver.rb', line 80

def initialize(properties_to_resolve)
  @properties_to_resolve = parse_properties(properties_to_resolve)
end

Class Method Details

.register_resolver(resolver) ⇒ Object 



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# File 'backend/app/lib/uri_resolver.rb', line 88

def self.register_resolver(resolver)
  resolvers.insert(0, resolver)
end

.resolvers ⇒ Object 



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# File 'backend/app/lib/uri_resolver.rb', line 84

def self.resolvers
  @resolvers ||= [TreeResolver, ASModelResolver]
end

Instance Method Details

#ensure_reference_is_valid(uri, active_repository_id = nil) ⇒ Object 



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# File 'backend/app/lib/uri_resolver.rb', line 92

def ensure_reference_is_valid(uri, active_repository_id = nil)
  parsed = JSONModel.parse_reference(uri)

  # error on anything that points outside the active repository
  if active_repository_id && \
     parsed[:repository] && \
     JSONModel.parse_reference(parsed[:repository])[:id] != active_repository_id

    raise ReferenceError.new("Inter-repository links are not allowed in this operation! (Bad link: '#{uri}'; Active repo: '#/repositories/#{active_repository_id}')")
  end

  resolver = get_resolver_for_type(parsed[:type])

  if resolver && !resolver.record_exists?(uri)
    raise ReferenceError.new("Reference does not exist! (Reference: '#{uri}')")
  end
end

#resolve_references(value) ⇒ Object

Walk ‘value’, find all refs, resolve them



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# File 'backend/app/lib/uri_resolver.rb', line 111

def resolve_references(value)
  return value if @properties_to_resolve.empty?

  # Make sure we have an array, even if there's just one record to resolve
  was_wrapped = false
  if value.is_a?(Array)
    records = value
  else
    records = ASUtils.wrap(value)
    was_wrapped = true
  end

  # Any JSONModels can become vanilla hashes
  records = records.map {|value|
    if value.is_a?(JSONModelType)
      value.to_hash(:trusted)
    else
      value
    end
  }

  # We'll work through our records breadth-first, first resolving non-nested
  # properties, then those that are nested two-levels deep, then
  # three-levels deep, and so on.
  #
  # With each iteration, we try to group together resolve requests for
  # common record types to get as much bang for our SQL buck as possible.
  depth = 1
  while true
    properties_for_current_depth = @properties_to_resolve.select {|property| property.length == depth}

    break if properties_for_current_depth.empty?

    refs_to_resolve = find_matching_refs(records, properties_for_current_depth)

    resolved = fetch_records_by_uri(refs_to_resolve.map {|ref| ref['ref']})

    refs_to_resolve.each do |ref|
      uri = ref['ref']
      ref['_resolved'] = resolved.fetch(uri) if resolved.has_key?(uri)
    end

    depth += 1
  end

  # Return the same type we were given
  was_wrapped ? records[0] : records
end