Class: PG::BasicTypeRegistry::CoderMap

Inherits:
Object
  • Object
show all
Defined in:
lib/pg/basic_type_registry.rb

Overview

An instance of this class stores the coders that should be used for a particular wire format (text or binary) and type cast direction (encoder or decoder).

Each coder object is filled with the PostgreSQL type name, OID, wire format and array coders are filled with the base elements_type.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(result, coders_by_name, format, arraycoder) ⇒ CoderMap

Returns a new instance of CoderMap.



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# File 'lib/pg/basic_type_registry.rb', line 45

def initialize(result, coders_by_name, format, arraycoder)
  coder_map = {}

  arrays, nodes = result.partition { |row| row['typinput'] == 'array_in' }

  # populate the base types
  nodes.find_all { |row| coders_by_name.key?(row['typname']) }.each do |row|
    coder = coders_by_name[row['typname']].dup
    coder.oid = row['oid'].to_i
    coder.name = row['typname']
    coder.format = format
    coder_map[coder.oid] = coder.freeze
  end

  if arraycoder
    # populate array types
    arrays.each do |row|
      elements_coder = coder_map[row['typelem'].to_i]
      next unless elements_coder

      coder = arraycoder.new
      coder.oid = row['oid'].to_i
      coder.name = row['typname']
      coder.format = format
      coder.elements_type = elements_coder
      coder.needs_quotation = !DONT_QUOTE_TYPES[elements_coder.name]
      coder_map[coder.oid] = coder.freeze
    end
  end

  @coders = coder_map.values.freeze
  @coders_by_name = @coders.inject({}){|h, t| h[t.name] = t; h }.freeze
  @coders_by_oid = @coders.inject({}){|h, t| h[t.oid] = t; h }.freeze
  freeze
end

Instance Attribute Details

#coders ⇒ Object (readonly)

Returns the value of attribute coders.



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# File 'lib/pg/basic_type_registry.rb', line 81

def coders
  @coders
end

#coders_by_name ⇒ Object (readonly)

Returns the value of attribute coders_by_name.



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# File 'lib/pg/basic_type_registry.rb', line 83

def coders_by_name
  @coders_by_name
end

#coders_by_oid ⇒ Object (readonly)

Returns the value of attribute coders_by_oid.



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# File 'lib/pg/basic_type_registry.rb', line 82

def coders_by_oid
  @coders_by_oid
end

Instance Method Details

#coder_by_name(name) ⇒ Object 



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# File 'lib/pg/basic_type_registry.rb', line 85

def coder_by_name(name)
  @coders_by_name[name]
end

#coder_by_oid(oid) ⇒ Object 



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# File 'lib/pg/basic_type_registry.rb', line 89

def coder_by_oid(oid)
  @coders_by_oid[oid]
end