org.jboss.marshalling.JDKSpecific Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* Copyright 2018 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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.jboss.marshalling;
import static java.lang.System.getSecurityManager;
import static java.security.AccessController.doPrivileged;
import static sun.reflect.ReflectionFactory.getReflectionFactory;
import java.io.OptionalDataException;
import java.security.PrivilegedAction;
import java.util.Iterator;
import java.util.function.Function;
import java.util.stream.Stream;
import sun.reflect.ReflectionFactory;
/**
*/
final class JDKSpecific {
private JDKSpecific() {}
private static final ReflectionFactory reflectionFactory = getSecurityManager() == null ? getReflectionFactory() : doPrivileged(new PrivilegedAction() {
public ReflectionFactory run() { return ReflectionFactory.getReflectionFactory(); }
});
static OptionalDataException createOptionalDataException(final int length) {
final OptionalDataException optionalDataException = createOptionalDataException(false);
optionalDataException.length = length;
return optionalDataException;
}
static OptionalDataException createOptionalDataException(final boolean eof) {
return reflectionFactory.newOptionalDataExceptionForSerialization(eof);
}
private static final StackWalker stackWalker = getSecurityManager() == null
? StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE)
: doPrivileged(new PrivilegedAction() {
public StackWalker run() {
return StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE);
}
});
private static final Function, Class> callerFinder = new Function, Class>() {
public Class apply(final Stream stream) {
final Iterator iterator = stream.iterator();
StackWalker.StackFrame frame;
do {
if (! iterator.hasNext()) {
throw new IllegalStateException();
}
frame = iterator.next();
} while (frame.getDeclaringClass() != JDKSpecific.class);
if (! iterator.hasNext()) {
throw new IllegalStateException();
}
// caller of JDKSpecific.getMyCaller
iterator.next();
if (! iterator.hasNext()) {
throw new IllegalStateException();
}
// caller of the caller of JDKSpecific.getMyCaller
return iterator.next().getDeclaringClass();
}
};
static Class getMyCaller() {
return stackWalker.walk(callerFinder);
}
}