flink-core/src/main/java/org/apache/flink/util/function/FunctionWithException.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.util.function;

import org.apache.flink.annotation.Public;

/**
 * A functional interface for a {@link java.util.function.Function} that may
 * throw exceptions.
 *
 * @param <T> The type of the argument to the function.
 * @param <R> The type of the result of the supplier.
 * @param <E> The type of Exceptions thrown by this function.
 */
@Public
@FunctionalInterface
public interface FunctionWithException<T, R, E extends Throwable> {

	/**
	 * Calls this function.
	 *
	 * @param value The argument to the function.
	 * @return The result of thus supplier.
	 * @throws E This function may throw an exception.
	 */
	R apply(T value) throws E;
}