eu.solven.cleanthat.utils.ResultOrError Maven / Gradle / Ivy
/*
* Copyright 2023 Benoit Lacelle - SOLVEN
*
* Licensed 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 eu.solven.cleanthat.utils;
import java.util.Optional;
/**
* Helps working with method which may fail without throwing an Exception
*
* @author Benoit Lacelle
*
* @param
* @param
*/
public final class ResultOrError {
final Optional optResult;
final Optional optError;
public ResultOrError(Optional optResult, Optional optError) {
this.optResult = optResult;
this.optError = optError;
if (optResult.isEmpty() && optError.isEmpty()) {
throw new IllegalArgumentException("Need a result or an error");
} else if (optResult.isPresent() && optError.isPresent()) {
throw new IllegalArgumentException("Can not have both a result and an error");
}
}
public Optional getOptResult() {
return optResult;
}
public Optional getOptError() {
return optError;
}
public static ResultOrError result(R result) {
return new ResultOrError(Optional.of(result), Optional.empty());
}
public static ResultOrError error(E error) {
return new ResultOrError(Optional.empty(), Optional.of(error));
}
}