Class: GorgonAMQ::Protocol::TableValueEncoder

Inherits:
Object
  • Object
show all
Includes:
TypeConstants
Defined in:
lib/gorgon_amq-protocol/lib/gorgon_amq/protocol/table_value_encoder.rb

Constant Summary

Constants included from TypeConstants

GorgonAMQ::Protocol::TypeConstants::BOOLEAN_FALSE, GorgonAMQ::Protocol::TypeConstants::BOOLEAN_TRUE, GorgonAMQ::Protocol::TypeConstants::TEN, GorgonAMQ::Protocol::TypeConstants::TYPE_32BIT_FLOAT, GorgonAMQ::Protocol::TypeConstants::TYPE_64BIT_FLOAT, GorgonAMQ::Protocol::TypeConstants::TYPE_ARRAY, GorgonAMQ::Protocol::TypeConstants::TYPE_BOOLEAN, GorgonAMQ::Protocol::TypeConstants::TYPE_BYTE_ARRAY, GorgonAMQ::Protocol::TypeConstants::TYPE_DECIMAL, GorgonAMQ::Protocol::TypeConstants::TYPE_HASH, GorgonAMQ::Protocol::TypeConstants::TYPE_INTEGER, GorgonAMQ::Protocol::TypeConstants::TYPE_SIGNED_16BIT, GorgonAMQ::Protocol::TypeConstants::TYPE_SIGNED_64BIT, GorgonAMQ::Protocol::TypeConstants::TYPE_SIGNED_8BIT, GorgonAMQ::Protocol::TypeConstants::TYPE_STRING, GorgonAMQ::Protocol::TypeConstants::TYPE_TIME, GorgonAMQ::Protocol::TypeConstants::TYPE_VOID

Class Method Summary collapse

Class Method Details

.array_size(value) ⇒ Object 



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# File 'lib/gorgon_amq-protocol/lib/gorgon_amq/protocol/table_value_encoder.rb', line 113

def self.array_size(value)
  acc = 0
  value.each { |v| acc += self.field_value_size(v) }

  acc
end

.encode(value) ⇒ Object

API



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# File 'lib/gorgon_amq-protocol/lib/gorgon_amq/protocol/table_value_encoder.rb', line 25

def self.encode(value)
  accumulator = String.new

  case value
  when String then
    accumulator << TYPE_STRING
    accumulator << [value.bytesize].pack(PACK_UINT32)
    accumulator << value
  when Symbol then
    v = value.to_s
    accumulator << TYPE_STRING
    accumulator << [v.bytesize].pack(PACK_UINT32)
    accumulator << v
  when Integer then
    accumulator << TYPE_INTEGER
    accumulator << [value].pack(PACK_UINT32)
  when GorgonAMQ::Protocol::Float32Bit then
    accumulator << TYPE_32BIT_FLOAT
    accumulator << [value.value].pack(PACK_32BIT_FLOAT)
  when Float then
    accumulator << TYPE_64BIT_FLOAT
    accumulator << [value].pack(PACK_64BIT_FLOAT)
  when true, false then
    accumulator << TYPE_BOOLEAN
    accumulator << (value ? BOOLEAN_TRUE : BOOLEAN_FALSE)
  when Time then
    accumulator << TYPE_TIME
    accumulator << [value.to_i].pack(PACK_INT64).reverse # FIXME: there has to be a more efficient way
  when nil then
    accumulator << TYPE_VOID
  when Array then
    accumulator << TYPE_ARRAY
    accumulator << [self.array_size(value)].pack(PACK_UINT32)

    value.each { |v| accumulator << self.encode(v) }
  when Hash then
    accumulator << TYPE_HASH
    accumulator << GorgonAMQ::Protocol::Table.encode(value)
  else
    # We don't want to require these libraries.
    if defined?(BigDecimal) && value.is_a?(BigDecimal)
      accumulator << TYPE_DECIMAL
      if value.exponent < 0
        decimals = -value.exponent
        raw = (value * (decimals ** 10)).to_i
        accumulator << [decimals + 1, raw].pack(PACK_UCHAR_UINT32) # somewhat like floating point
      else
        # per spec, the "decimals" octet is unsigned (!)
        accumulator << [0, value.to_i].pack(PACK_UCHAR_UINT32)
      end
    else
      raise ArgumentError.new("Unsupported value #{value.inspect} of type #{value.class.name}")
    end # if
  end # case

  accumulator
end

.field_value_size(value) ⇒ Object 



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# File 'lib/gorgon_amq-protocol/lib/gorgon_amq/protocol/table_value_encoder.rb', line 86

def self.field_value_size(value)
  # the type tag takes 1 byte
  acc = 1

  case value
  when String then
    acc += (value.bytesize + 4)
  when Integer then
    acc += 4
  when Float then
    acc += 8
  when Time, DateTime then
    acc += 8
  when true, false then
    acc += 1
  when nil then
    # nothing, type tag alone is enough
  when Hash then
    acc += (4 + Table.hash_size(value))
  when Array then
    acc += (4 + self.array_size(value))
  end

  acc
end