Class: Args

Inherits:
Object
  • Object
show all
Defined in:
app/args.rb

Overview

Argument validation.

Class Method Summary collapse

Class Method Details

.fetch_non_empty_hash(hash, key) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'app/args.rb', line 16

def self.fetch_non_empty_hash(hash, key)
  value = fetch_non_nil(hash, key, Hash)
  raise ArgumentError, "parameter #{key} empty" if value.empty?

  value
end

.fetch_non_empty_int(hash, key) ⇒ Object 



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# File 'app/args.rb', line 12

def self.fetch_non_empty_int(hash, key)
  fetch_non_nil(hash, key, Integer)
end

.fetch_non_empty_string(hash, key) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'app/args.rb', line 5

def self.fetch_non_empty_string(hash, key)
  value = fetch_non_nil(hash, key, String)
  raise ArgumentError, "parameter #{key} empty" if value.strip.empty?

  value
end

.fetch_non_nil(hash, key, *classes) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'app/args.rb', line 31

def self.fetch_non_nil(hash, key, *classes)
  raise ArgumentError, "parameter #{key} missing" unless hash.key?(key)

  raise ArgumentError, "parameter #{key} null" if hash[key].nil?

  fetch_optional(hash, key, *classes)
end

.fetch_optional(hash, key, *classes) ⇒ Object 



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# File 'app/args.rb', line 39

def self.fetch_optional(hash, key, *classes)
  value = hash[key]
  if value && classes.size.positive? && !classes.find { |clazz| value.is_a?(clazz) }
    if classes.size != 1
      raise ArgumentError, "parameter #{key} not #{classes.map(&:to_s).map(&:downcase).join(' or ')}"
    end

    class_name = classes[0].to_s.downcase
    class_name = %w[a e i o u].include?(class_name[0]) ? "an #{class_name}" : "a #{class_name}"
    raise ArgumentError, "parameter #{key} not #{class_name}"
  end

  value
end

.fetch_optional_array(hash, key) ⇒ Object 



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# File 'app/args.rb', line 27

def self.fetch_optional_array(hash, key)
  fetch_optional(hash, key, Array)
end

.fetch_optional_hash(hash, key) ⇒ Object 



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# File 'app/args.rb', line 23

def self.fetch_optional_hash(hash, key)
  fetch_optional(hash, key, Hash)
end