/*
* 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.java.functions;
import org.apache.flink.annotation.Internal;
/**
* Used as a dummy {@link KeySelector} to allow using keyed operators
* for non-keyed usecases. Essentially, it gives all incoming records
* the same key, which is a {@code (byte) 0} value.
*
* @param <T> The type of the input element.
*/
@Internal
public class NullByteKeySelector<T> implements KeySelector<T, Byte> {
private static final long serialVersionUID = 614256539098549020L;
@Override
public Byte getKey(T value) throws Exception {
return 0;
}
}