1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.lang3.function;
19
20 import java.util.function.DoubleToLongFunction;
21
22 /**
23 * A functional interface like {@link DoubleToLongFunction} that declares a {@link Throwable}.
24 *
25 * @param <E> The kind of thrown exception or error.
26 * @since 3.11
27 */
28 @FunctionalInterface
29 public interface FailableDoubleToLongFunction<E extends Throwable> {
30
31 /** NOP singleton */
32 @SuppressWarnings("rawtypes")
33 FailableDoubleToLongFunction NOP = t -> 0;
34
35 /**
36 * Returns The NOP singleton.
37 *
38 * @param <E> The kind of thrown exception or error.
39 * @return The NOP singleton.
40 */
41 @SuppressWarnings("unchecked")
42 static <E extends Throwable> FailableDoubleToLongFunction<E> nop() {
43 return NOP;
44 }
45
46 /**
47 * Applies this function to the given argument.
48 *
49 * @param value the function argument
50 * @return the function result
51 * @throws E if the operation fails
52 */
53 int applyAsLong(double value) throws E;
54 }