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Contents
# frozen_string_literal: true
module Arstotzka
# @api private
#
# Class responsible for reading values from a hash
class KeyReader
include Base
# Creates a new instance of Reader
#
# @param [Hash] hash Hash where the key will be found
# @param [String] base_key The key to be checked
# (before case change)
def initialize(hash, base_key, options_hash = {})
self.options = options_hash
@hash = hash
@base_key = base_key
end
# Reads value from hash key
#
# @raise Arstotzka::Exception::KeyNotFound
#
# @return [Object]
#
# @example Simple usage
# hash = { theKey: 'value' }
# key = { 'the_key' }
# reader = Arstotzka::KeyReader.new(hash, key)
#
# reader.read # returns 'value'
#
# @example
# hash = { 'the_key' => 'value' }
# key = 'TheKey'
# reader = Arstotzka::KeyReader.new(hash, key)
#
# reader.read # returns 'value'
#
def read
raise Exception::KeyNotFound unless key?
hash.key?(key) ? hash[key] : hash[key.to_sym]
end
private
attr_reader :hash, :base_key, :options
delegate :key, to: :key_changer
# @private
#
# Checks if hash contains or not the key
#
# The check first happens using String key and,
# in case of not found, searches as symbol
#
# @return [Boolean]
#
# @see #check_key!
def key?
return unless hash
hash.key?(key) || hash.key?(key.to_sym)
end
# @private
#
# Returns key changer for getting the correct key
#
# @return [KeyChanger]
def key_changer
@key_changer ||= KeyChanger.new(base_key, options)
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems