org.springframework.util.ReflectionUtils Maven / Gradle / Ivy
/*
* Copyright 2002-2005 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 org.springframework.util;
import java.lang.reflect.InvocationTargetException;
/**
* Simple utility class for handling reflection exceptions.
* Only intended for internal use.
*
* @author Juergen Hoeller
* @since 1.2.2
*/
public abstract class ReflectionUtils {
/**
* Handle the given reflection exception.
* Should only be called if no checked exception is expected to
* be thrown by the target method.
* Throws the underlying RuntimeException or Error in case
* of an InvocationTargetException with such a root cause. Throws
* an IllegalStateException with an appropriate message else.
* @param ex the reflection exception to handle
*/
public static void handleReflectionException(Exception ex) {
if (ex instanceof NoSuchMethodException) {
throw new IllegalStateException("Method not found: " + ex.getMessage());
}
if (ex instanceof IllegalAccessException) {
throw new IllegalStateException("Could not access method: " + ex.getMessage());
}
if (ex instanceof InvocationTargetException) {
handleInvocationTargetException((InvocationTargetException) ex);
}
throw new IllegalStateException(
"Unexpected reflection exception - " + ex.getClass().getName() + ": " + ex.getMessage());
}
/**
* Handle the given invocation target exception.
* Should only be called if no checked exception is expected to
* be thrown by the target method.
*
Throws the underlying RuntimeException or Error in case
* of such a root cause. Throws an IllegalStateException else.
* @param ex the invocation target exception to handle
*/
public static void handleInvocationTargetException(InvocationTargetException ex) {
if (ex.getTargetException() instanceof RuntimeException) {
throw (RuntimeException) ex.getTargetException();
}
if (ex.getTargetException() instanceof Error) {
throw (Error) ex.getTargetException();
}
throw new IllegalStateException(
"Unexpected exception thrown by method - " + ex.getTargetException().getClass().getName() +
": " + ex.getTargetException().getMessage());
}
}