Passing services via type-safe container instead of map.

compiler/util/src/org/jetbrains/jet/config/CompilerServices.kt

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2010-2014 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.jet.config
+
+import java.util.HashMap
+
+public class CompilerServices private(private val map: Map<Class<*>, Any>) {
+
+    public fun <T> get(interfaceClass: Class<T>): T {
+        return map.get(interfaceClass) as T
+    }
+
+    public class Builder {
+        private val map = HashMap<Class<*>, Any>()
+
+        public fun <T> register(interfaceClass: Class<T>, implementation: T): Builder {
+            map.put(interfaceClass, implementation)
+            return this
+        }
+
+        public fun build(): CompilerServices {
+            return CompilerServices(map)
+        }
+    }
+
+    public class object {
+        public val empty: CompilerServices
+            get() = Builder().build()
+    }
+}