/*
* 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.api.common.functions;
import org.apache.flink.annotation.Public;
/**
* Rich variant of the {@link FoldFunction}. As a {@link RichFunction}, it gives access to the
* {@link org.apache.flink.api.common.functions.RuntimeContext} and provides setup and teardown methods:
* {@link RichFunction#open(org.apache.flink.configuration.Configuration)} and
* {@link RichFunction#close()}.
*
* @param <T> Type of the initial input and the returned element
* @param <O> Type of the elements that the group/list/stream contains
*
*@deprecated use {@link RichAggregateFunction} instead
*/
@Public
@Deprecated
public abstract class RichFoldFunction<O, T> extends AbstractRichFunction implements FoldFunction<O, T> {
private static final long serialVersionUID = 1L;
@Override
public abstract T fold(T accumulator, O value) throws Exception;
}