#! Add @experimental for easier API evolution

sdks/java/extensions/euphoria/euphoria-core/src/main/java/cz/seznam/euphoria/core/annotation/stability/Experimental.java

@@ -0,0 +1,45 @@
+/**
+ * Copyright 2016-2017 Seznam.cz, a.s.
+ *
+ * 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 cz.seznam.euphoria.core.annotation.stability;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Target;
+
+/**
+ * Any (API) item annotated with this annotation signals that the item
+ * is purely experimental and may be change or completely removed without
+ * any notice at any time.
+ * <p>
+ *
+ * Clients should generally avoid usage of such items, except when experimenting :)
+ */
+@Documented
+@Target({
+    ElementType.TYPE,
+    ElementType.FIELD,
+    ElementType.METHOD,
+    ElementType.PARAMETER,
+    ElementType.CONSTRUCTOR,
+    ElementType.ANNOTATION_TYPE,
+    ElementType.PACKAGE
+})
+public @interface Experimental {
+
+ /** A human readable hint about the experiment. */
+ String value() default "";
+
+}