Class: Graphomaton::IdentifierAllocator

Inherits:
Object
  • Object
show all
Defined in:
lib/graphomaton/identifier_allocator.rb

Overview

Assigns deterministic, collision-free identifiers within one export.

Instance Method Summary collapse

Constructor Details

#initialize(reserved: []) ⇒ IdentifierAllocator

Returns a new instance of IdentifierAllocator.



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# File 'lib/graphomaton/identifier_allocator.rb', line 6

def initialize(reserved: [])
  @identifiers = {}
  @used = reserved.to_h { |identifier| [identifier.to_s, true] }
  @counters = Hash.new(0)
end

Instance Method Details

#allocate(key, preferred: nil, prefix: 'id') ⇒ Object 



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# File 'lib/graphomaton/identifier_allocator.rb', line 12

def allocate(key, preferred: nil, prefix: 'id')
  return @identifiers[key] if @identifiers.key?(key)

  candidate = preferred.to_s unless preferred.nil?
  candidate = nil if candidate&.empty? || @used.key?(candidate)
  candidate ||= next_identifier(prefix)

  @used[candidate] = true
  @identifiers[key] = candidate
end