Class: Mongo::Protocol::Serializers::BitVector Private

Inherits:
Object
  • Object
show all
Defined in:
lib/mongo/protocol/bit_vector.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Class used to define a bitvector for a MongoDB wire protocol message.

Defines serialization strategy upon initialization.

Instance Method Summary collapse

Constructor Details

#initialize(layout) ⇒ BitVector

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Initializes a BitVector with a layout

Parameters:

  • layout (Array<Symbol>) —

    the array of fields in the bit vector



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# File 'lib/mongo/protocol/bit_vector.rb', line 28

def initialize(layout)
  @masks = {}
  layout.each_with_index do |field, index|
    @masks[field] = 2**index
  end
end

Instance Method Details

#deserialize(buffer) ⇒ Array<Symbol>

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Deserializes vector by decoding the symbol according to its mask

Parameters:

  • buffer (String) —

    Buffer containing the vector to be deserialized.

Returns:

  • (Array<Symbol>) —

    Flags contained in the vector



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# File 'lib/mongo/protocol/bit_vector.rb', line 52

def deserialize(buffer)
  vector = buffer.get_int32
  flags = []
  @masks.each do |flag, mask|
    flags << flag if mask & vector != 0
  end
  flags
end

#serialize(buffer, value) ⇒ String

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Serializes vector by encoding each symbol according to its mask

Parameters:

  • buffer (String) —

    Buffer to receive the serialized vector

  • value (Array<Symbol>) —

    Array of flags to encode

Returns:

  • (String) —

    Buffer that received the serialized vector



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# File 'lib/mongo/protocol/bit_vector.rb', line 41

def serialize(buffer, value)
  bits = 0
  value.each { |flag| bits |= @masks[flag] }
  buffer.put_int32(bits)
end