flink-tests/src/test/java/org/apache/flink/test/util/IdentityMapFunction.java

/*
 * 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.test.util;

import org.apache.flink.api.common.functions.MapFunction;

/**
 * A map function that always returns its input argument.
 *
 * @param <T> The type of the input and output
 */
public class IdentityMapFunction<T> implements MapFunction<T, T> {

    private static final long serialVersionUID = 1L;

    @Override
    public T map(final T value) throws Exception {
        return value;
    }
}