Class: Textus::Domain::Policy::Guard

Inherits:
Object
  • Object
show all
Defined in:
lib/textus/domain/policy/guard.rb

Overview

An ordered list of pure predicates over one Evaluation (ADR 0031). check! short-circuits on the first failing predicate that defines a bespoke #error (only zone_writable_by → WriteForbidden, the product’s legible topology refusal); every other failure accumulates into GuardFailed naming the unmet predicate(s).

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(predicates) ⇒ Guard

Returns a new instance of Guard.



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# File 'lib/textus/domain/policy/guard.rb', line 14

def initialize(predicates)
  @predicates = predicates
end

Instance Attribute Details

#predicates ⇒ Object (readonly)

Returns the value of attribute predicates.



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# File 'lib/textus/domain/policy/guard.rb', line 12

def predicates
  @predicates
end

Instance Method Details

#check!(eval) ⇒ Object

Raises:



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# File 'lib/textus/domain/policy/guard.rb', line 18

def check!(eval)
  accumulated = []
  @predicates.each do |pred|
    next if pred.call(eval)
    raise pred.error(eval) if pred.respond_to?(:error)

    accumulated << [pred.name, pred.reason]
  end
  raise Textus::GuardFailed.new(accumulated) unless accumulated.empty?
end

#explain(eval) ⇒ Object 



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# File 'lib/textus/domain/policy/guard.rb', line 29

def explain(eval)
  @predicates.map { |p| [p.name, p.call(eval), p.reason] }
end