/*
* 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.flink.streaming.api.functions.aggregation;
import org.apache.flink.annotation.Internal;
import org.apache.flink.api.common.functions.ReduceFunction;
/**
* Holder class for aggregation types that can be used on a windowed stream or keyed stream.
*/
@Internal
public abstract class AggregationFunction<T> implements ReduceFunction<T> {
private static final long serialVersionUID = 1L;
/**
* Aggregation types that can be used on a windowed stream or keyed stream.
*/
public enum AggregationType {
SUM, MIN, MAX, MINBY, MAXBY,
}
}