Class: PG::BasicTypeRegistry::CoderMap

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

Overview

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

Constant Summary collapse

DONT_QUOTE_TYPES =

Hash of text types that don't require quotation, when used within composite types.

type.name => true
%w[
	int2 int4 int8
	float4 float8
	oid
	bool
	date timestamp timestamptz
].inject({}){|h,e| h[e] = true; h }

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

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

Returns a new instance of CoderMap.


19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
# File 'lib/pg/basic_type_mapping.rb', line 19

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

	_ranges, nodes = result.partition { |row| row['typinput'] == 'range_in' }
	leaves, nodes = nodes.partition { |row| row['typelem'].to_i == 0 }
	arrays, nodes = nodes.partition { |row| row['typinput'] == 'array_in' }

	# populate the enum types
	_enums, leaves = leaves.partition { |row| row['typinput'] == 'enum_in' }
	# 		enums.each do |row|
	# 			coder_map[row['oid'].to_i] = OID::Enum.new
	# 		end

	# populate the base types
	leaves.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
	end

	_records_by_oid = result.group_by { |row| row['oid'] }

	# populate composite types
	# 		nodes.each do |row|
	# 			add_oid row, records_by_oid, coder_map
	# 		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
		end
	end

	# populate range types
	# 		ranges.find_all { |row| coder_map.key? row['rngsubtype'].to_i }.each do |row|
	# 			subcoder = coder_map[row['rngsubtype'].to_i]
	# 			range = OID::Range.new subcoder
	# 			coder_map[row['oid'].to_i] = range
	# 		end

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

Instance Attribute Details

#codersObject (readonly)

Returns the value of attribute coders


76
77
78
# File 'lib/pg/basic_type_mapping.rb', line 76

def coders
  @coders
end

#coders_by_nameObject (readonly)

Returns the value of attribute coders_by_name


78
79
80
# File 'lib/pg/basic_type_mapping.rb', line 78

def coders_by_name
  @coders_by_name
end

#coders_by_oidObject (readonly)

Returns the value of attribute coders_by_oid


77
78
79
# File 'lib/pg/basic_type_mapping.rb', line 77

def coders_by_oid
  @coders_by_oid
end

Instance Method Details

#coder_by_name(name) ⇒ Object


80
81
82
# File 'lib/pg/basic_type_mapping.rb', line 80

def coder_by_name(name)
	@coders_by_name[name]
end

#coder_by_oid(oid) ⇒ Object


84
85
86
# File 'lib/pg/basic_type_mapping.rb', line 84

def coder_by_oid(oid)
	@coders_by_oid[oid]
end