Class: VV::JSON

Inherits:
Object show all
Defined in:
lib/vv/serialization/json.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(maximum_bytes, float_kwargs: nil) ⇒ JSON

Returns a new instance of JSON.



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# File 'lib/vv/serialization/json.rb', line 17

def initialize maximum_bytes,
               float_kwargs: nil

  @max = maximum_bytes
  @response = ""
  @float_kwargs = float_kwargs || {}
end

Class Method Details

.default_max ⇒ Object 



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# File 'lib/vv/serialization/json.rb', line 3

def self.default_max
  1.mebibyte
end

.generate(object, maximum_bytes = nil, **kwargs) ⇒ Object 



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# File 'lib/vv/serialization/json.rb', line 7

def self.generate object,
                  maximum_bytes=nil,
                  **kwargs

  max = maximum_bytes || self.default_max

  generator = self.new( max, **kwargs )
  generator.serialize object
end

Instance Method Details

#check_for_size_failure! ⇒ Object 



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# File 'lib/vv/serialization/json.rb', line 76

def check_for_size_failure!
  size_failure! if @response.size > @max
end

#default_max ⇒ Object 



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# File 'lib/vv/serialization/json.rb', line 72

def default_max
  self.class.default_max
end

#serialize(object) ⇒ Object Also known as: serialize! 



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# File 'lib/vv/serialization/json.rb', line 25

def serialize object

  self.check_for_size_failure!

  case object
  when Hash
    @response += "{"

    object.each do |key, value|
      self.serialize! key.to_s
      @response += ":"

      self.serialize! value
      @response += ","
    end

    @response.chomp! ","
    @response += "}"
  when Array
    @response += "["

    object.each do |value|
      self.serialize! value
      @response += ","
    end

    @response.chomp! ","
    @response += "]"
  when String
    self.size_failure! if ( object.size + 2 ) > @max
    @response += object.to_json
  when Float
    @response += object.vv_json( **@float_kwargs )
  else
    if object.respond_to? :vv_json
      @response += object.vv_json
    else
      fail "VV::JSON cannot generate JSON for `#{object.class}`."
    end
  end

  self.check_for_size_failure!

  @response
end

#size_failure! ⇒ Object 



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# File 'lib/vv/serialization/json.rb', line 80

def size_failure!
  if @max == self.default_max
    fail "VV::JSON generation size exceeds default max of 1 MiB"
  else
    fail "VV::JSON generation size exceeds max of `#{@max}` bytes"
  end
end