org.wildfly.security.manager.JDKSpecific Maven / Gradle / Ivy
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* JBoss, Home of Professional Open Source
*
* Copyright 2018 Red Hat, Inc. and/or its affiliates.
*
* 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.wildfly.security.manager;
import sun.reflect.Reflection;
/**
* JDK-specific classes which are replaced for different JDK major versions. This class is for JDK 8.
* @author Justin Cook
*/
final class JDKSpecific {
private static boolean active;
private static int offset;
static {
boolean active = false;
int offset = 0;
try {
// JDK-8014925 - An additional Reflection call may be on the call stack so check the offset needed.
active = Reflection.getCallerClass(1) == WildFlySecurityManager.class || Reflection.getCallerClass(2) == WildFlySecurityManager.class;
offset = Reflection.getCallerClass(1) == Reflection.class ? 2 : 1;
} catch (Throwable ignored) {}
JDKSpecific.active = active;
// JDKSpecific.getCallerClass will also add 1 to the stack.
JDKSpecific.offset = offset + 1;
}
public static Class getCallerClass(int n) {
if (active) {
return Reflection.getCallerClass(n + offset);
} else {
throw new IllegalStateException("sun.reflect.Reflect.getCallerClass(int) not available.");
}
}
public static boolean usingStackWalker() {
return false;
}
}