Component container add tools to specify default implementation of a component

core/util.runtime/src/org/jetbrains/kotlin/container/DefaultImplementation.kt

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2010-2017 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.container
+
+import kotlin.reflect.KClass
+
+/*Use to assist injection to provide a default implementation for a certain component and reduce boilerplate in injector code.
+* Argument class must be a non-abstract component class or a kotlin object implementing target interface.
+* Avoid using when there is no clear 'default' behaviour for a component.
+* */
+annotation class DefaultImplementation(val impl: KClass<*>)