io.netty.util.internal.ReflectionUtil Maven / Gradle / Ivy
/*
* Copyright 2017 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.util.internal;
import java.lang.reflect.AccessibleObject;
public final class ReflectionUtil {
private ReflectionUtil() { }
/**
* Try to call {@link AccessibleObject#setAccessible(boolean)} but will catch any {@link SecurityException} and
* {@link java.lang.reflect.InaccessibleObjectException} and return it.
* The caller must check if it returns {@code null} and if not handle the returned exception.
*/
public static Throwable trySetAccessible(AccessibleObject object, boolean checkAccessible) {
if (checkAccessible && !PlatformDependent0.isExplicitTryReflectionSetAccessible()) {
return new UnsupportedOperationException("Reflective setAccessible(true) disabled");
}
try {
object.setAccessible(true);
return null;
} catch (SecurityException e) {
return e;
} catch (RuntimeException e) {
return handleInaccessibleObjectException(e);
}
}
private static RuntimeException handleInaccessibleObjectException(RuntimeException e) {
// JDK 9 can throw an inaccessible object exception here; since Netty compiles
// against JDK 7 and this exception was only added in JDK 9, we have to weakly
// check the type
if ("java.lang.reflect.InaccessibleObjectException".equals(e.getClass().getName())) {
return e;
}
throw e;
}
}