| 1 | /* | |
| 2 | * Copyright 2014-2016 Grzegorz Piwowarek, https://4comprehension.com/ | |
| 3 | * | |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
| 5 | * you may not use this file except in compliance with the License. | |
| 6 | * You may obtain a copy of the License at | |
| 7 | * | |
| 8 | * https://www.apache.org/licenses/LICENSE-2.0 | |
| 9 | * | |
| 10 | * Unless required by applicable law or agreed to in writing, software | |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 13 | * See the License for the specific language governing permissions and | |
| 14 | * limitations under the License. | |
| 15 | */ | |
| 16 | package com.pivovarit.function; | |
| 17 | ||
| 18 | import java.util.Optional; | |
| 19 | import java.util.function.BiFunction; | |
| 20 | ||
| 21 | import static java.util.Objects.requireNonNull; | |
| 22 | ||
| 23 | /** | |
| 24 | * Represents a function that accepts two arguments and produces a result. | |
| 25 | * This is the two-arity specialization of {@link ThrowingFunction}. | |
| 26 | * Function may throw a checked exception. | |
| 27 | * | |
| 28 | * @param <T1> the type of the first argument to the function | |
| 29 | * @param <T2> the type of the second argument to the function | |
| 30 | * @param <R> the type of the result of the function | |
| 31 | * @param <E> the type of the thrown checked exception | |
| 32 | * | |
| 33 | * @author Grzegorz Piwowarek | |
| 34 | * @see ThrowingFunction | |
| 35 | */ | |
| 36 | @FunctionalInterface | |
| 37 | public interface ThrowingBiFunction<T1, T2, R, E extends Exception> { | |
| 38 | /** | |
| 39 | * Applies this function to the given arguments. | |
| 40 | * | |
| 41 | * @param arg1 the first function argument | |
| 42 | * @param arg2 the second function argument | |
| 43 | * @return the function result | |
| 44 | * @throws E the checked exception type | |
| 45 | */ | |
| 46 | R apply(T1 arg1, T2 arg2) throws E; | |
| 47 | ||
| 48 | /** | |
| 49 | * Returns a new BiFunction instance which wraps the thrown checked exception instance into a {@link CheckedException} | |
| 50 | * | |
| 51 | * @param <T1> the type of the first argument to the function | |
| 52 | * @param <T2> the type of the second argument to the function | |
| 53 | * @param <R> the type of the result of the function | |
| 54 | * @param function the ThrowingBiFunction to wrap | |
| 55 | * @return BiFunction instance that wraps the checked exception into a {@link CheckedException} | |
| 56 | */ | |
| 57 | static <T1, T2, R> BiFunction<T1, T2, R> unchecked(ThrowingBiFunction<? super T1, ? super T2, ? extends R, ?> function) { | |
| 58 | requireNonNull(function); | |
| 59 | ||
| 60 |
1
1. unchecked : replaced return value with null for com/pivovarit/function/ThrowingBiFunction::unchecked → KILLED |
return (arg1, arg2) -> { |
| 61 | try { | |
| 62 |
1
1. lambda$unchecked$0 : replaced return value with null for com/pivovarit/function/ThrowingBiFunction::lambda$unchecked$0 → SURVIVED |
return function.apply(arg1, arg2); |
| 63 | } catch (final Exception e) { | |
| 64 | throw new CheckedException(e); | |
| 65 | } | |
| 66 | }; | |
| 67 | } | |
| 68 | ||
| 69 | /** | |
| 70 | * Returns a new BiFunction instance which rethrows the checked exception using the Sneaky Throws pattern | |
| 71 | * | |
| 72 | * @param <T1> the type of the first argument to the function | |
| 73 | * @param <T2> the type of the second argument to the function | |
| 74 | * @param <R> the type of the result of the function | |
| 75 | * @param function the ThrowingBiFunction to wrap | |
| 76 | * @return BiFunction instance that rethrows the checked exception using the Sneaky Throws pattern | |
| 77 | */ | |
| 78 | static <T1, T2, R> BiFunction<T1, T2, R> sneaky(ThrowingBiFunction<? super T1, ? super T2, ? extends R, ?> function) { | |
| 79 | requireNonNull(function); | |
| 80 |
1
1. sneaky : replaced return value with null for com/pivovarit/function/ThrowingBiFunction::sneaky → KILLED |
return (t1, t2) -> { |
| 81 | try { | |
| 82 |
1
1. lambda$sneaky$0 : replaced return value with null for com/pivovarit/function/ThrowingBiFunction::lambda$sneaky$0 → NO_COVERAGE |
return function.apply(t1, t2); |
| 83 | } catch (final Exception ex) { | |
| 84 |
1
1. lambda$sneaky$0 : replaced return value with null for com/pivovarit/function/ThrowingBiFunction::lambda$sneaky$0 → NO_COVERAGE |
return SneakyThrowUtil.sneakyThrow(ex); |
| 85 | } | |
| 86 | }; | |
| 87 | } | |
| 88 | ||
| 89 | /** | |
| 90 | * Returns a new BiFunction instance which returns the result as an Optional, or an empty Optional in case of a thrown exception | |
| 91 | * | |
| 92 | * @param <T1> the type of the first argument to the function | |
| 93 | * @param <T2> the type of the second argument to the function | |
| 94 | * @param <R> the type of the result of the function | |
| 95 | * @param function the ThrowingBiFunction to wrap | |
| 96 | * @return BiFunction instance that returns the result as an Optional, or empty Optional in case of a thrown exception | |
| 97 | */ | |
| 98 | static <T1, T2, R> BiFunction<T1, T2, Optional<R>> optional(ThrowingBiFunction<? super T1, ? super T2, ? extends R, ?> function) { | |
| 99 | requireNonNull(function); | |
| 100 | ||
| 101 |
1
1. optional : replaced return value with null for com/pivovarit/function/ThrowingBiFunction::optional → KILLED |
return (arg1, arg2) -> { |
| 102 | try { | |
| 103 |
1
1. lambda$optional$0 : replaced return value with Optional.empty for com/pivovarit/function/ThrowingBiFunction::lambda$optional$0 → KILLED |
return Optional.ofNullable(function.apply(arg1, arg2)); |
| 104 | } catch (final Exception e) { | |
| 105 | return Optional.empty(); | |
| 106 | } | |
| 107 | }; | |
| 108 | } | |
| 109 | } | |
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