Implements app::data_store using NSUserDefaults

Redefined classes

redef class DataStore

ios :: data_store $ DataStore

Simple data storage facility

All class definitions

redef class DataStore

ios :: data_store $ DataStore

Simple data storage facility
package_diagram ios::data_store data_store app::data_store data_store ios::data_store->app::data_store cocoa::foundation foundation ios::data_store->cocoa::foundation json json ios::data_store->json app::app_base app_base app::data_store->app::app_base serialization serialization app::data_store->serialization core core cocoa::foundation->core json->serialization parser_base parser_base json->parser_base ...app::app_base ... ...app::app_base->app::app_base ...serialization ... ...serialization->serialization ...core ... ...core->core ...parser_base ... ...parser_base->parser_base a_star-m a_star-m a_star-m->ios::data_store

Ancestors

module abstract_collection

core :: abstract_collection

Abstract collection classes and services.
module abstract_text

core :: abstract_text

Abstract class for manipulation of sequences of characters
module app_base

app :: app_base

Base of the app.nit framework, defines App
module array

core :: array

This module introduces the standard array structure.
module bitset

core :: bitset

Services to handle BitSet
module bytes

core :: bytes

Services for byte streams and arrays
module caching

serialization :: caching

Services for caching serialization engines
module circular_array

core :: circular_array

Efficient data structure to access both end of the sequence.
module codec_base

core :: codec_base

Base for codecs to use with streams
module codecs

core :: codecs

Group module for all codec-related manipulations
module collection

core :: collection

This module define several collection classes.
module core

core :: core

Standard classes and methods used by default by Nit programs and libraries.
module engine_tools

serialization :: engine_tools

Advanced services for serialization engines
module environ

core :: environ

Access to the environment variables of the process
module error

core :: error

Standard error-management infrastructure.
module error

json :: error

Intro JsonParseError which is exposed by all JSON reading APIs
module exec

core :: exec

Invocation and management of operating system sub-processes.
module file

core :: file

File manipulations (create, read, write, etc.)
module fixed_ints

core :: fixed_ints

Basic integers of fixed-precision
module fixed_ints_text

core :: fixed_ints_text

Text services to complement fixed_ints
module flat

core :: flat

All the array-based text representations
module gc

core :: gc

Access to the Nit internal garbage collection mechanism
module hash_collection

core :: hash_collection

Introduce HashMap and HashSet.
module inspect

serialization :: inspect

Refine Serializable::inspect to show more useful information
module iso8859_1

core :: iso8859_1

Codec for ISO8859-1 I/O
module kernel

core :: kernel

Most basic classes and methods.
module list

core :: list

This module handle double linked lists
module math

core :: math

Mathematical operations
module meta

meta :: meta

Simple user-defined meta-level to manipulate types of instances as object.
module native

core :: native

Native structures for text and bytes
module numeric

core :: numeric

Advanced services for Numeric types
module parser_base

parser_base :: parser_base

Simple base for hand-made parsers of all kinds
module poset

poset :: poset

Pre order sets and partial order set (ie hierarchies)
module protocol

core :: protocol

module queue

core :: queue

Queuing data structures and wrappers
module range

core :: range

Module for range of discrete objects.
module re

core :: re

Regular expression support for all services based on Pattern
module ropes

core :: ropes

Tree-based representation of a String.
module safe

serialization :: safe

Services for safer deserialization engines
module serialization

serialization :: serialization

General serialization services
module serialization_core

serialization :: serialization_core

Abstract services to serialize Nit objects to different formats
module serialization_read

json :: serialization_read

Services to read JSON: deserialize_json and JsonDeserializer
module serialization_write

json :: serialization_write

Services to write Nit objects to JSON strings: serialize_to_json and JsonSerializer
module sorter

core :: sorter

This module contains classes used to compare things and sorts arrays.
module static

json :: static

Static interface to read Nit objects from JSON strings
module stream

core :: stream

Input and output streams of characters
module text

core :: text

All the classes and methods related to the manipulation of text entities
module time

core :: time

Management of time and dates
module union_find

core :: union_find

union–find algorithm using an efficient disjoint-set data structure
module utf8

core :: utf8

Codec for UTF-8 I/O

Parents

module data_store

app :: data_store

Key/value storage services
module foundation

cocoa :: foundation

The Foundation Kit provides basic Objective-C classes and structures
module json

json :: json

Read and write JSON formatted text using the standard serialization services

Children

module a_star-m

a_star-m

# Implements `app::data_store` using `NSUserDefaults`
module data_store

import app::data_store
import cocoa::foundation
private import json

redef class DataStore

	# The `NSUserDefaults` used to implement `DataStore`
	var user_defaults = new NSUserDefaults.standard_user_defaults is lazy

	redef fun [](key)
	do
		var nsstr = user_defaults.string_for_key(key.to_nsstring)

		if nsstr.address_is_null then return null

		# TODO report errors
		var deserializer = new JsonDeserializer(nsstr.to_s)
		var deserialized = deserializer.deserialize

		var errors = deserializer.errors
		if errors.not_empty then
			# An update may have broken the versioning compatibility
			print_error "{class_name} error at deserialization: {errors.join(", ")}"
			return null # Let's be safe
		end

		return deserialized
	end

	redef fun []=(key, value)
	do
		var nsobject: NSString

		if value == null then
			nsobject = new NSString.nil
		else
			var serialized_string = new StringWriter
			var serializer = new JsonSerializer(serialized_string)
			serializer.serialize(value)

			# TODO report errors
			nsobject = serialized_string.to_s.to_nsstring
		end

		user_defaults.set_object(nsobject, key.to_nsstring)
	end
end
lib/ios/data_store.nit:15,1--64,3