| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 |
| * |
| * https://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.apache.avro.reflect; |
| |
| import java.lang.annotation.Documented; |
| import java.lang.annotation.ElementType; |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| import java.lang.annotation.Target; |
| |
| /** |
| * Declares that a Java type should be represented by an Avro union schema. May |
| * be used for base classes or interfaces whose instantiable subclasses can be |
| * listed in the parameters to the @Union annotation. If applied to method |
| * parameters this determines the reflected message parameter type. If applied |
| * to a method, this determines its return type. A null schema may be specified |
| * with {@link java.lang.Void}. |
| */ |
| @Retention(RetentionPolicy.RUNTIME) |
| @Target({ ElementType.TYPE, ElementType.FIELD, ElementType.PARAMETER, ElementType.METHOD }) |
| @Documented |
| public @interface Union { |
| /** The instantiable classes that compose this union. */ |
| Class[] value(); |
| } |