001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.apache.reef.tang.annotations; 020 021import java.lang.annotation.*; 022 023@Target(ElementType.TYPE) 024@Documented 025@Retention(RetentionPolicy.RUNTIME) 026public @interface NamedParameter { 027 String REEF_UNINITIALIZED_VALUE = "__REEF_UNINITIALIZED_VALUE__"; 028 029 //Class<?> type() default String.class; 030 String doc() default ""; 031 032 String short_name() default ""; 033 034 // One of the following should be set. 035 String default_value() default REEF_UNINITIALIZED_VALUE; 036 037 Class<?> default_class() default Void.class; 038 039 String[] default_values() default {}; 040 041 Class<?>[] default_classes() default {}; 042}