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# frozen_string_literal: true |
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require_relative '../../mixin/reflection' |
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require_relative '../../mixin/errors' |
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module AMA |
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module Entity |
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class Mapper |
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module Handler |
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module Entity |
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# Default denormalization processor |
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class Denormalizer |
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include Mixin::Reflection |
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include Mixin::Errors |
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INSTANCE = new |
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# @param [Hash] source |
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# @param [AMA::Entity::Mapper::Type] type |
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# @param [AMA::Entity::Mapper::Context] context |
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def denormalize(source, type, context = nil) |
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validate_source!(source, type, context) |
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entity = type.factory.create(type, source, context) |
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type.attributes.values.each do |attribute| |
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next if attribute.virtual |
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candidate_names(attribute).each do |name| |
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next unless source.key?(name) |
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value = source[name] |
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break set_object_attribute(entity, attribute.name, value) |
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end |
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end |
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entity |
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end |
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private |
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# @param [AMA::Entity::Mapper::Type::Attribute] attribute |
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# @return [Array<Symbol, String>] |
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def candidate_names(attribute) |
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[attribute.name, *attribute.aliases].flat_map do |candidate| |
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[candidate, candidate.to_s] |
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end |
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end |
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# @param [Hash] source |
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# @param [AMA::Entity::Mapper::Type] type |
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# @param [AMA::Entity::Mapper::Context] context |
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def validate_source!(source, type, context) |
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return if source.is_a?(Hash) |
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message = "Expected Hash, #{source.class} provided " \ |
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"(while denormalizing #{type})" |
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mapping_error(message, context: context) |
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end |
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class << self |
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include Mixin::Reflection |
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# @param [Denormalizer] implementation |
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# @return [Denormalizer] |
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def wrap(implementation) |
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handler = handler_factory(implementation, INSTANCE) |
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depiction = "Safety wrapper for #{implementation}" |
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wrapper = method_object(:denormalize, to_s: depiction, &handler) |
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wrapper.singleton_class.instance_eval do |
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include Mixin::Errors |
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end |
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wrapper |
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end |
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private |
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# @param [Denormalizer] implementation |
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# @param [Denormalizer] fallback |
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# @return [Denormalizer] |
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def handler_factory(implementation, fallback) |
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lambda do |source, type, ctx| |
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begin |
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implementation.denormalize(source, type, ctx) do |s, t, c| |
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fallback.denormalize(s, t, c) |
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end |
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rescue StandardError => e |
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raise_if_internal(e) |
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message = 'Unexpected error from denormalizer ' \ |
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"#{implementation}" |
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signature = '(source, type, context)' |
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options = { parent: e, context: ctx, signature: signature } |
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compliance_error(message, **options) |
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end |
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end |
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end |
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end |
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end |
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end |
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end |
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end |
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end |
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end |
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ama-team /
ruby-entity-mapper
