org.apache.pig.scripting.groovy.AccumulatorAccumulate Maven / Gradle / Ivy
The newest version!
/*
* 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
*
* 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.apache.pig.scripting.groovy;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* This annotation is to be used on a Groovy method which
* is part of an Accumulator UDF to indicate that it will
* act as the 'accumulate' method of the UDF.
*
* The value of the annotation is the name of the Accumulator UDF
* it belongs to.
*
* The annotated method MUST NOT be static and MUST accept a single groovy.lang.Tuple as parameter.
* Its return value, if any, is ignored.
*/
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface AccumulatorAccumulate {
String value();
}