From b6b2aa6c49da7d6566c376369c8b970766615066 Mon Sep 17 00:00:00 2001
From: Sergey Penkovsky <sergey.penkovsky@gmail.com>
Date: Sat, 27 Jun 2020 07:14:22 +0300
Subject: [PATCH] implemented resolvers

---
 lib/resolvers/factory_resolver.dart   | 15 +++++++++++++++
 lib/resolvers/resolver.dart           | 11 +++++++++++
 lib/resolvers/singelton_resolver.dart | 16 ++++++++++++++++
 lib/resolvers/value_resolver.dart     | 15 +++++++++++++++
 4 files changed, 57 insertions(+)
 create mode 100644 lib/resolvers/factory_resolver.dart
 create mode 100644 lib/resolvers/resolver.dart
 create mode 100644 lib/resolvers/singelton_resolver.dart
 create mode 100644 lib/resolvers/value_resolver.dart

diff --git a/lib/resolvers/factory_resolver.dart b/lib/resolvers/factory_resolver.dart
new file mode 100644
index 0000000..3f1f81f
--- /dev/null
+++ b/lib/resolvers/factory_resolver.dart
@@ -0,0 +1,15 @@
+import 'package:dart_di/resolvers/resolver.dart';
+
+/**
+ * Разрешает зависимость для фабричной функции
+ */
+class FactoryResolver<T> extends Resolver<T> {
+  Function _factory;
+
+  FactoryResolver(this._factory);
+
+  @override
+  T resolve() {
+    return _factory();
+  }
+}
diff --git a/lib/resolvers/resolver.dart b/lib/resolvers/resolver.dart
new file mode 100644
index 0000000..2aad3e7
--- /dev/null
+++ b/lib/resolvers/resolver.dart
@@ -0,0 +1,11 @@
+/**
+ * Resolver - это абстракция, которая определяет,
+ * как контейнер будет разрешать зависимость
+ */
+abstract class Resolver<T> {
+  /**
+     * Разрешает зависимость типа [T]
+     * @return - возвращает объект типа [T]
+     */
+  T resolve();
+}
diff --git a/lib/resolvers/singelton_resolver.dart b/lib/resolvers/singelton_resolver.dart
new file mode 100644
index 0000000..0a936ef
--- /dev/null
+++ b/lib/resolvers/singelton_resolver.dart
@@ -0,0 +1,16 @@
+import 'package:dart_di/resolvers/resolver.dart';
+
+class SingletonResolver<T> extends Resolver<T> {
+  Resolver<T> _decoratedResolver;
+  T _value = null;
+
+  SingletonResolver(this._decoratedResolver);
+
+  @override
+  T resolve() {
+    if (_value == null) {
+      _value = _decoratedResolver.resolve();
+    }
+    return _value;
+  }
+}
diff --git a/lib/resolvers/value_resolver.dart b/lib/resolvers/value_resolver.dart
new file mode 100644
index 0000000..7460312
--- /dev/null
+++ b/lib/resolvers/value_resolver.dart
@@ -0,0 +1,15 @@
+import 'package:dart_di/resolvers/resolver.dart';
+
+/**
+ * Разрешает зависимость для значения
+ */
+class ValueResolver<T> extends Resolver<T> {
+  T _value;
+
+  ValueResolver(this._value);
+
+  @override
+  T resolve() {
+    return _value;
+  }
+}