Class: AMQ::Protocol::Table

Inherits:
Object
  • Object
show all
Includes:
TypeConstants
Defined in:
lib/amq/protocol/table.rb

Defined Under Namespace

Classes: InvalidTableError

Constant Summary

Constants included from TypeConstants

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

Class Method Summary collapse

Class Method Details

.decode(data) ⇒ Object 



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# File 'lib/amq/protocol/table.rb', line 53

def self.decode(data)
  table        = Hash.new
  table_length = data.unpack(PACK_UINT32).first

  return table if table_length.zero?

  offset       = 4
  while offset <= table_length
    key, offset  = decode_table_key(data, offset)
    type, offset = TableValueDecoder.decode_value_type(data, offset)

    table[key] = case type
                 when TYPE_STRING
                   v, offset = TableValueDecoder.decode_string(data, offset)
                   v
                 when TYPE_BYTE_ARRAY
                   # Ruby doesn't have a direct counterpart to
                   # ByteBuffer or byte[], so using a string feels
                   # more appropriate than an array of fixnums
                   v, offset = TableValueDecoder.decode_string(data, offset)
                   v
                 when TYPE_INTEGER
                   v, offset = TableValueDecoder.decode_integer(data, offset)
                   v
                 when TYPE_DECIMAL
                   v, offset = TableValueDecoder.decode_big_decimal(data, offset)
                   v
                 when TYPE_TIME
                   v, offset = TableValueDecoder.decode_time(data, offset)
                   v
                 when TYPE_HASH
                   v, offset = TableValueDecoder.decode_hash(data, offset)
                   v
                 when TYPE_BOOLEAN
                   v, offset = TableValueDecoder.decode_boolean(data, offset)
                   v
                when TYPE_BYTE  then
                   v, offset = TableValueDecoder.decode_byte(data, offset)
                   v
                 when TYPE_SIGNED_16BIT then
                   v, offset = TableValueDecoder.decode_short(data, offset)
                   v
                 when TYPE_SIGNED_64BIT then
                   v, offset = TableValueDecoder.decode_long(data, offset)
                   v
                 when TYPE_32BIT_FLOAT then
                   v, offset = TableValueDecoder.decode_32bit_float(data, offset)
                   v
                 when TYPE_64BIT_FLOAT then
                   v, offset = TableValueDecoder.decode_64bit_float(data, offset)
                   v
                 when TYPE_VOID
                   nil
                 when TYPE_ARRAY
                   v, offset = TableValueDecoder.decode_array(data, offset)
                   v
                 else
                   raise ArgumentError, "Not a valid type: #{type.inspect}\nData: #{data.inspect}\nUnprocessed data: #{data[offset..-1].inspect}\nOffset: #{offset}\nTotal size: #{table_length}\nProcessed data: #{table.inspect}"
                 end
  end

  table
end

.decode_table_key(data, offset) ⇒ Object 



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# File 'lib/amq/protocol/table.rb', line 134

def self.decode_table_key(data, offset)
  key_length = data.slice(offset, 1).unpack(PACK_CHAR).first
  offset += 1
  key = data.slice(offset, key_length)
  offset += key_length

  [key, offset]
end

.encode(table) ⇒ Object 



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# File 'lib/amq/protocol/table.rb', line 29

def self.encode(table)
  buffer = String.new

  table ||= {}

  table.each do |key, value|
    key = key.to_s # it can be a symbol as well
    buffer << key.bytesize.chr + key

    case value
    when Hash then
      buffer << TYPE_HASH
      buffer << self.encode(value)
    else
      buffer << TableValueEncoder.encode(value).force_encoding(buffer.encoding)
    end
  end

  [buffer.bytesize].pack(PACK_UINT32).force_encoding(buffer.encoding) + buffer
end

.hash_size(value) ⇒ Object 



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# File 'lib/amq/protocol/table.rb', line 123

def self.hash_size(value)
  acc = 0
  value.each do |k, v|
    acc += (1 + k.to_s.bytesize)
    acc += TableValueEncoder.field_value_size(v)
  end

  acc
end

.length(data) ⇒ Object 



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# File 'lib/amq/protocol/table.rb', line 118

def self.length(data)
  data.unpack(PACK_UINT32).first
end