Method: Xqsr3::Containers::MultiMap#fetch

Defined in:

lib/xqsr3/containers/multi_map.rb

#fetch(key, default = (default_parameter_defaulted_ = true; nil), &block) ⇒ Object

Returns the values associated with the given key

• Parameters:

  • key The key

  • default The default value

# File 'lib/xqsr3/containers/multi_map.rb', line 324

def fetch key, default = (default_parameter_defaulted_ = true; nil), &block

	unless default_parameter_defaulted_

		case	default
		when	::NilClass, ::Array
			;
		else
			raise TypeError, "default parameter ('#{default}') must be of type #{::Array}, but was of type #{default.class}"
		end
	end

	unless @inner.has_key? key

		return default unless default_parameter_defaulted_

		if block_given?

			r = nil

			case	block.arity
			when	0
				r = yield
			when	1
				r = yield key
			else
				raise ArgumentError, "given block must take a single parameter - #{block.arity} given"
			end

			case	r
			when	::Array
				;
			else
				raise ArgumentError, "given block must return a value of type #{::Array} or one convertible implicitly to such" unless r.respond_to? :to_ary

				r = r.to_ary
			end

			return r
		end

		raise KeyError, "given key '#{key}' (#{key.class}) does not exist"
	end

	@inner.fetch key
end