Class: Core::Io::Json::Stream

Inherits:
Object
  • Object
show all
Defined in:
app/api/core/io/json/stream.rb

Overview

Custom JSON streaming class to handle streamed serialization of API V1 objects

Defined Under Namespace

Classes: Interface

Constant Summary collapse

ZIPPABLE = 
Interface.new(:zip).freeze

Instance Method Summary collapse

Constructor Details

#initialize(buffer) ⇒ Stream

Returns a new instance of Stream.


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# File 'app/api/core/io/json/stream.rb', line 20

def initialize(buffer)
  @buffer, @have_output_value = buffer, []
end

Instance Method Details

#array(attribute, objects) ⇒ Object 


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# File 'app/api/core/io/json/stream.rb', line 32

def array(attribute, objects)
  named(attribute) { array_encode(objects) { |v| yield(self, v) } }
end

#attribute(attribute, value, options = {}) ⇒ Object 


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# File 'app/api/core/io/json/stream.rb', line 36

def attribute(attribute, value, options = {})
  named(attribute) { encode(value, options) }
end

#block(attribute, &block) ⇒ Object 


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# File 'app/api/core/io/json/stream.rb', line 40

def block(attribute, &block)
  named(attribute) { open(&block) }
end

#encode(object, options = {}) ⇒ Object

rubocop:todo Metrics/MethodLength, Metrics/AbcSize


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# File 'app/api/core/io/json/stream.rb', line 45

def encode(object, options = {}) # rubocop:todo Metrics/CyclomaticComplexity
  case object
  when NilClass
    unencoded('null')
  when Symbol
    string_encode(object)
  when TrueClass
    unencoded('true')
  when FalseClass
    unencoded('false')
  when String
    string_encode(object)
  when Integer
    unencoded(object.to_s)
  when Float
    unencoded(object.to_s)
  when Date
    string_encode(object)
  when ActiveSupport::TimeWithZone
    string_encode(object.to_s)
  when Time
    string_encode(object.to_s(:compatible))
  when Hash
    hash_encode(object, options)
  when ZIPPABLE
    array_encode(object) { |o| encode(o, options) }
  else
    object_encode(object, options)
  end
end

#named(attribute) ⇒ Object 


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# File 'app/api/core/io/json/stream.rb', line 88

def named(attribute)
  unencoded(',') if have_output_value?
  encode(attribute)
  unencoded(':')
  yield
ensure
  have_output_value
end

#open ⇒ Object 


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# File 'app/api/core/io/json/stream.rb', line 24

def open
  flush do
    unencoded('{')
    yield(self)
    unencoded('}')
  end
end