/*
* Copyright 2013 the original author or authors.
*
* 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 ratpack.util;
import ratpack.api.UncheckedException;
import ratpack.func.Factory;
/**
* Utility methods for dealing with exceptions.
*/
public abstract class ExceptionUtils {
/**
* Converts the given throwable to a {@link RuntimeException} if necessary.
* <p>
* If {@code throwable} is an {@link Error}, it will be thrown.
* <p>
* If {@code throwable} is a {@link RuntimeException}, it will be returned unchanged.
* <p>
* If {@code throwable} is not a {@link RuntimeException}, a newly created {@link UncheckedException} will be returned with the original throwable as the cause and with no message.
*
* @param throwable the throwable to ensure is a runtime exception
* @return a runtime throwable
*/
public static RuntimeException uncheck(Throwable throwable) {
if (throwable instanceof Error) {
throw (Error) throwable;
}
if (throwable instanceof RuntimeException) {
return (RuntimeException) throwable;
} else {
return new UncheckedException(throwable);
}
}
/**
* Converts the given throwable to an {@link Exception} if necessary.
* <p>
* If {@code throwable} is an {@link Error}, it will be thrown.
* <p>
* If {@code throwable} is an {@link Exception}, it will be returned unchanged.
* <p>
* If {@code throwable} is not an {@link Exception}, a newly created {@link UncheckedException} will be returned with the original throwable as the cause and with no message.
*
* @param throwable the throwable to ensure is an exception
* @return a runtime throwable
*/
public static Exception toException(Throwable throwable) {
if (throwable instanceof Error) {
throw (Error) throwable;
}
if (throwable instanceof Exception) {
return (Exception) throwable;
} else {
return new UncheckedException(throwable);
}
}
/**
* Throws the given throwable if it is an {@link Error}, otherwise does nothing.
*
* @param throwable the throwable to throw if it is an {@link Error}
*/
public static void throwIfError(Throwable throwable) {
if (throwable instanceof Error) {
throw (Error) throwable;
}
}
/**
* Executes the given factory, returning its result and unchecking any exceptions it throws.
* <p>
* If the factory throws an exception, it will be thrown via {@link #uncheck(Throwable)}.
*
* @param factory a value producer
* @param <T> the type of value produced
* @return the value produced by the given factory
*/
public static <T> T uncheck(Factory<T> factory) {
try {
return factory.create();
} catch (Exception e) {
throw uncheck(e);
}
}
}