Treat kotlin's kotlin.Deprecated as a deprecated operation

Author: mikhael-sokolov-rs

modules/swagger-core/src/main/java/io/swagger/util/KotlinDetector.java

@@ -0,0 +1,45 @@
+/**
+ * Copyright 2016 SmartBear Software
+ * <p>
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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 io.swagger.util;
+
+import java.lang.annotation.Annotation;
+
+public class KotlinDetector {
+    private static final Boolean kotlinAvailable;
+    private static final Class<? extends Annotation> kotlinDeprecated;
+
+    static {
+        kotlinAvailable = loadByClassOrNull("kotlin.Metadata") != null;
+        kotlinDeprecated = loadByClassOrNull("kotlin.Deprecated");
+    }
+
+    private static <T> Class<T> loadByClassOrNull(String className) {
+        try {
+            return (Class<T>) ReflectionUtils.loadClassByName(className);
+        } catch (ClassNotFoundException ex) {
+            return null;
+        }
+    }
+
+    public static boolean isKotlinPresent() {
+        return kotlinAvailable;
+    }
+
+    public static Class<? extends Annotation> getKotlinDeprecated() {
+        return kotlinDeprecated;
+    }
+}

modules/swagger-jaxrs/src/main/java/io/swagger/jaxrs/Reader.java

@@ -70,6 +70,7 @@
 import io.swagger.models.properties.RefProperty;
 import io.swagger.util.BaseReaderUtils;
 import io.swagger.util.Json;
+import io.swagger.util.KotlinDetector;
 import io.swagger.util.ParameterProcessor;
 import io.swagger.util.PathUtils;
 import io.swagger.util.ReflectionUtils;
@@ -917,7 +918,8 @@ private Operation parseMethod(Class<?> cls, Method method, AnnotatedMethod annot
             addResponse(operation, apiResponse, jsonViewAnnotation);
         }
 
-        if (ReflectionUtils.getAnnotation(method, Deprecated.class) != null) {
+        if (ReflectionUtils.getAnnotation(method, Deprecated.class) != null
+                || (KotlinDetector.isKotlinPresent() && ReflectionUtils.getAnnotation(method, KotlinDetector.getKotlinDeprecated()) != null)) {
             operation.setDeprecated(true);
         }
 

modules/swagger-servlet/src/main/java/io/swagger/servlet/extensions/ServletReaderExtension.java

@@ -34,6 +34,7 @@
 import io.swagger.models.properties.RefProperty;
 import io.swagger.servlet.ReaderContext;
 import io.swagger.util.BaseReaderUtils;
+import io.swagger.util.KotlinDetector;
 import io.swagger.util.ParameterProcessor;
 import io.swagger.util.PathUtils;
 import io.swagger.util.ReflectionUtils;
@@ -271,7 +272,8 @@ public void applySchemes(ReaderContext context, Operation operation, Method meth
 
     @Override
     public void setDeprecated(Operation operation, Method method) {
-        if (ReflectionUtils.getAnnotation(method, Deprecated.class) != null) {
+        if (ReflectionUtils.getAnnotation(method, Deprecated.class) != null
+                || (KotlinDetector.isKotlinPresent() && ReflectionUtils.getAnnotation(method, KotlinDetector.getKotlinDeprecated()) != null)) {
             operation.deprecated(true);
         }
     }