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module Dry
class Container
# Default resolver for resolving items from container
#
# @api public
class Resolver
# Resolve an item from the container
#
# @param [Concurrent::Hash] container
# The container
# @param [Mixed] key
# The key for the item you wish to resolve
# @yield
# Fallback block to call when a key is missing. Its result will be returned
# @yieldparam [Mixed] key Missing key
#
# @raise [Dry::Conainer::Error]
# If the given key is not registered with the container (and no block provided)
#
#
# @return [Mixed]
#
# @api public
def call(container, key)
item = container.fetch(key.to_s) do
if block_given?
return yield(key)
else
raise Error, "Nothing registered with the key #{key.inspect}"
end
end
item.call
end
# Check whether an items is registered under the given key
#
# @param [Concurrent::Hash] container
# The container
# @param [Mixed] key
# The key you wish to check for registration with
#
# @return [Bool]
#
# @api public
def key?(container, key)
container.key?(key.to_s)
end
# An array of registered names for the container
#
# @return [Array]
#
# @api public
def keys(container)
container.keys
end
# Calls block once for each key in container, passing the key as a parameter.
#
# If no block is given, an enumerator is returned instead.
#
# @return Hash
#
# @api public
def each_key(container, &block)
container.each_key(&block)
end
# Calls block once for each key in container, passing the key and the registered item parameters.
#
# If no block is given, an enumerator is returned instead.
#
# @return Key, Value
#
# @api public
# @note In discussions with other developers, it was felt that being able to iterate over not just
# the registered keys, but to see what was registered would be very helpful. This is a step
# toward doing that.
def each(container, &block)
container.map { |key, value| [key, value.call] }.each(&block)
end
end
end
end
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