com.sun.xml.bind.api.Utils Maven / Gradle / Ivy
/*
* Copyright (c) 2013, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0, which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package com.sun.xml.bind.api;
import com.sun.xml.bind.v2.model.nav.Navigator;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Utils class.
*
* WARNING: If you are doing any changes don't forget to change other Utils classes in different packages.
*
* Has *package private* access to avoid inappropriate usage.
*/
final class Utils {
private static final Logger LOGGER = Logger.getLogger(Utils.class.getName());
/**
* static ReflectionNavigator field to avoid usage of reflection every time we use it.
*/
static final Navigator REFLECTION_NAVIGATOR;
static { // we statically initializing REFLECTION_NAVIGATOR property
try {
final Class refNav = Class.forName("com.sun.xml.bind.v2.model.nav.ReflectionNavigator");
// requires accessClassInPackage privilege
final Method getInstance = AccessController.doPrivileged(
new PrivilegedAction() {
@Override
public Method run() {
try {
Method getInstance = refNav.getDeclaredMethod("getInstance");
getInstance.setAccessible(true);
return getInstance;
} catch (NoSuchMethodException e) {
throw new IllegalStateException("ReflectionNavigator.getInstance can't be found");
}
}
}
);
//noinspection unchecked
REFLECTION_NAVIGATOR = (Navigator) getInstance.invoke(null);
} catch (ClassNotFoundException e) {
throw new IllegalStateException("Can't find ReflectionNavigator class");
} catch (InvocationTargetException e) {
throw new IllegalStateException("ReflectionNavigator.getInstance throws the exception");
} catch (IllegalAccessException e) {
throw new IllegalStateException("ReflectionNavigator.getInstance method is inaccessible");
} catch (SecurityException e) {
LOGGER.log(Level.FINE, "Unable to access ReflectionNavigator.getInstance", e);
throw e;
}
}
/**
* private constructor to avoid util class instantiating
*/
private Utils() {
}
}