1 /*
2 * Copyright 2017 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. You may obtain a copy of the License at:
7 *
8 * https://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16 package io.netty.util.internal;
17
18 import java.lang.reflect.AccessibleObject;
19
20 public final class ReflectionUtil {
21
22 private ReflectionUtil() { }
23
24 /**
25 * Try to call {@link AccessibleObject#setAccessible(boolean)} but will catch any {@link SecurityException} and
26 * {@link java.lang.reflect.InaccessibleObjectException} and return it.
27 * The caller must check if it returns {@code null} and if not handle the returned exception.
28 */
29 public static Throwable trySetAccessible(AccessibleObject object, boolean checkAccessible) {
30 if (checkAccessible && !PlatformDependent0.isExplicitTryReflectionSetAccessible()) {
31 return new UnsupportedOperationException("Reflective setAccessible(true) disabled");
32 }
33 try {
34 object.setAccessible(true);
35 return null;
36 } catch (SecurityException e) {
37 return e;
38 } catch (RuntimeException e) {
39 return handleInaccessibleObjectException(e);
40 }
41 }
42
43 private static RuntimeException handleInaccessibleObjectException(RuntimeException e) {
44 // JDK 9 can throw an inaccessible object exception here; since Netty compiles
45 // against JDK 7 and this exception was only added in JDK 9, we have to weakly
46 // check the type
47 if ("java.lang.reflect.InaccessibleObjectException".equals(e.getClass().getName())) {
48 return e;
49 }
50 throw e;
51 }
52 }