refactor: add bindIf() and singletonIf()

incubation/container/container/lib/src/container.dart

@@ -1157,6 +1157,30 @@ class Container {
     bind(abstract).to(concrete);
   }
 
+  /// Register a binding if it hasn't already been registered
+  void bindIf<T>(dynamic concrete, {bool singleton = false}) {
+    if (!has<T>()) {
+      if (singleton) {
+        if (concrete is Function) {
+          registerLazySingleton<T>(concrete as T Function(Container));
+        } else {
+          registerSingleton<T>(concrete as T);
+        }
+      } else {
+        if (concrete is Function) {
+          registerFactory<T>(concrete as T Function(Container));
+        } else {
+          registerFactory<T>((c) => concrete as T);
+        }
+      }
+    }
+  }
+
+  /// Register a singleton if it hasn't already been registered
+  void singletonIf<T>(dynamic concrete) {
+    bindIf<T>(concrete, singleton: true);
+  }
+
   /// Register all attribute-based bindings for a type
   void registerAttributeBindings(Type type) {
     var annotations = reflector.getAnnotations(type);

incubation/container/container/test/conditional_binding_test.dart

@@ -0,0 +1,212 @@
+import 'package:platformed_container/container.dart';
+import 'package:test/test.dart';
+
+abstract class Logger {
+  void log(String message);
+}
+
+class ConsoleLogger implements Logger {
+  @override
+  void log(String message) => print('Console: $message');
+}
+
+class FileLogger implements Logger {
+  @override
+  void log(String message) => print('File: $message');
+}
+
+void main() {
+  late Container container;
+
+  setUp(() {
+    container = Container(MockReflector());
+  });
+
+  group('Conditional Binding Tests', () {
+    test('bindIf registers binding when not bound', () {
+      container.bindIf<Logger>(ConsoleLogger());
+      expect(container.make<Logger>(), isA<ConsoleLogger>());
+    });
+
+    test('bindIf skips registration when already bound', () {
+      container.bind(Logger).to(ConsoleLogger);
+      container.bindIf<Logger>(FileLogger());
+      expect(container.make<Logger>(), isA<ConsoleLogger>());
+    });
+
+    test('bindIf registers singleton when specified', () {
+      container.bindIf<Logger>(ConsoleLogger(), singleton: true);
+      var first = container.make<Logger>();
+      var second = container.make<Logger>();
+      expect(identical(first, second), isTrue);
+    });
+
+    test('singletonIf registers singleton when not bound', () {
+      container.singletonIf<Logger>(ConsoleLogger());
+      var first = container.make<Logger>();
+      var second = container.make<Logger>();
+      expect(identical(first, second), isTrue);
+    });
+
+    test('singletonIf skips registration when already bound', () {
+      container.bind(Logger).to(ConsoleLogger);
+      container.singletonIf<Logger>(FileLogger());
+      expect(container.make<Logger>(), isA<ConsoleLogger>());
+    });
+
+    test('bindIf works with factory functions', () {
+      container.bindIf<Logger>((c) => ConsoleLogger());
+      expect(container.make<Logger>(), isA<ConsoleLogger>());
+    });
+
+    test('singletonIf works with factory functions', () {
+      container.singletonIf<Logger>((c) => ConsoleLogger());
+      var first = container.make<Logger>();
+      var second = container.make<Logger>();
+      expect(identical(first, second), isTrue);
+    });
+  });
+}
+
+class MockReflector extends Reflector {
+  @override
+  String? getName(Symbol symbol) => null;
+
+  @override
+  ReflectedClass? reflectClass(Type clazz) {
+    if (clazz == Logger) {
+      return MockReflectedClass('Logger', [], [], [], Logger);
+    }
+    if (clazz == ConsoleLogger) {
+      return MockReflectedClass(
+          'ConsoleLogger', [], [], [MockConstructor('', [])], ConsoleLogger);
+    }
+    if (clazz == FileLogger) {
+      return MockReflectedClass(
+          'FileLogger', [], [], [MockConstructor('', [])], FileLogger);
+    }
+    return null;
+  }
+
+  @override
+  ReflectedType? reflectType(Type type) {
+    return reflectClass(type);
+  }
+
+  @override
+  ReflectedInstance? reflectInstance(Object? instance) => null;
+
+  @override
+  ReflectedFunction? reflectFunction(Function function) => null;
+
+  @override
+  ReflectedType reflectFutureOf(Type type) => throw UnimplementedError();
+
+  @override
+  Type? findTypeByName(String name) => null;
+
+  @override
+  ReflectedFunction? findInstanceMethod(Object instance, String methodName) =>
+      null;
+
+  @override
+  List<ReflectedInstance> getAnnotations(Type type) => [];
+
+  @override
+  List<ReflectedInstance> getParameterAnnotations(
+          Type type, String constructorName, String parameterName) =>
+      [];
+}
+
+class MockReflectedClass extends ReflectedType implements ReflectedClass {
+  @override
+  final List<ReflectedInstance> annotations;
+  @override
+  final List<ReflectedFunction> constructors;
+  @override
+  final List<ReflectedDeclaration> declarations;
+
+  MockReflectedClass(
+    String name,
+    List<ReflectedTypeParameter> typeParameters,
+    this.annotations,
+    this.constructors,
+    Type reflectedType,
+  )   : declarations = [],
+        super(reflectedType.toString(), typeParameters, reflectedType);
+
+  @override
+  ReflectedInstance newInstance(
+      String constructorName, List positionalArguments,
+      [Map<String, dynamic> namedArguments = const {},
+      List<Type> typeArguments = const []]) {
+    if (reflectedType == ConsoleLogger) {
+      return MockReflectedInstance(ConsoleLogger());
+    }
+    if (reflectedType == FileLogger) {
+      return MockReflectedInstance(FileLogger());
+    }
+    throw UnsupportedError('Unknown type: $reflectedType');
+  }
+
+  @override
+  bool isAssignableTo(ReflectedType? other) {
+    if (reflectedType == other?.reflectedType) {
+      return true;
+    }
+    if ((reflectedType == ConsoleLogger || reflectedType == FileLogger) &&
+        other?.reflectedType == Logger) {
+      return true;
+    }
+    return false;
+  }
+}
+
+class MockConstructor implements ReflectedFunction {
+  final String constructorName;
+  final List<ReflectedParameter> constructorParameters;
+
+  MockConstructor(this.constructorName, this.constructorParameters);
+
+  @override
+  List<ReflectedInstance> get annotations => [];
+
+  @override
+  bool get isGetter => false;
+
+  @override
+  bool get isSetter => false;
+
+  @override
+  String get name => constructorName;
+
+  @override
+  List<ReflectedParameter> get parameters => constructorParameters;
+
+  @override
+  ReflectedType? get returnType => null;
+
+  @override
+  List<ReflectedTypeParameter> get typeParameters => [];
+
+  @override
+  ReflectedInstance invoke(Invocation invocation) => throw UnimplementedError();
+}
+
+class MockReflectedInstance implements ReflectedInstance {
+  final dynamic value;
+
+  MockReflectedInstance(this.value);
+
+  @override
+  ReflectedClass get clazz => throw UnimplementedError();
+
+  @override
+  ReflectedInstance getField(String name) => throw UnimplementedError();
+
+  @override
+  dynamic get reflectee => value;
+
+  @override
+  ReflectedType get type => throw UnimplementedError();
+}