[result] orElseThrow() wraps the error exception in an unchecked MonResultException
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6 changed files with 57 additions and 7 deletions
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@ -1,6 +1,11 @@
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CHANGELOG
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=========
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1.1.0
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-----
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* [result] orElseThrow() wraps the error exception in an unchecked MonResultException
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1.0.0
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-----
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@ -806,6 +806,7 @@
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.thenWith(v -> () -> {throw new IOException();});
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#+END_SRC
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**** =Result<Maybe<T>> maybe(Predicate<T> predicate)=
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Wraps the value within the Result in a Maybe, either a Just if the
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@ -820,7 +821,7 @@
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**** =T orElseThrow()=
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Extracts the successful value from the result, or throws the error
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Throwable.
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as the cause within a the unchecked exception =MonResultException=.
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#+BEGIN_SRC java
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final Integer result = Result.of(() -> getValue())
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@ -972,6 +973,7 @@
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final Lazy<String> stringLazy = uuidLazy.map(v -> v.toString());
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#+END_SRC
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** Either
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Allows handling a value that can be one of two types, a left value/type or a
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@ -73,8 +73,8 @@ class Err<T> implements Result<T> {
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}
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@Override
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public T orElseThrow() throws Throwable {
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throw error;
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public T orElseThrow() throws MonResultException {
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throw MonResultException.with(error);
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}
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@Override
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44
src/main/java/net/kemitix/mon/result/MonResultException.java
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44
src/main/java/net/kemitix/mon/result/MonResultException.java
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/**
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* The MIT License (MIT)
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*
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* Copyright (c) 2018 Paul Campbell
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
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* and associated documentation files (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies
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* or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
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* AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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package net.kemitix.mon.result;
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/**
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* An Unchecked wrapper for exceptions thrown within a {@code Result}.
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*
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* @author Paul Campbell (pcampbell@kemitix.net)
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*/
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public final class MonResultException extends RuntimeException {
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private MonResultException(final Throwable cause) {
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super(cause);
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}
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/**
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* Creates a new object.
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*
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* @param cause the cause
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* @return a MonResultException contain the cause
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*/
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static MonResultException with(final Throwable cause) {
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return new MonResultException(cause);
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}
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}
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@ -109,10 +109,9 @@ public interface Result<T> extends Functor<T, Result<?>> {
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* Extracts the successful value from the result, or throws the error Throwable.
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*
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* @return the value if a success
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* @throws Throwable the result is an error
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* @throws MonResultException if the result is an error
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*/
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@SuppressWarnings("illegalthrows")
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public abstract T orElseThrow() throws Throwable;
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public abstract T orElseThrow() throws MonResultException;
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/**
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* Swaps the inner Result of a Maybe, so that a Result is on the outside.
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@ -292,7 +292,7 @@ public class ResultTest implements WithAssertions {
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final RuntimeException exception = new RuntimeException();
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final Result<Integer> error = Result.error(exception);
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//when
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assertThatThrownBy(() -> error.orElseThrow()).isSameAs(exception);
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assertThatThrownBy(() -> error.orElseThrow()).hasCause(exception);
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}
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@Test
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