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/*
* JBoss, Home of Professional Open Source
* Copyright 2009 Red Hat Inc. and/or its affiliates and other contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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.arquillian.protocol.servlet.runner;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* A set of privileged actions that are not to leak out
* of this package
*
* @version $Revision: $
*/
final class SecurityActions {
//-------------------------------------------------------------------------------||
// Constructor ------------------------------------------------------------------||
//-------------------------------------------------------------------------------||
/**
* No instantiation
*/
private SecurityActions() {
throw new UnsupportedOperationException("No instantiation");
}
//-------------------------------------------------------------------------------||
// Utility Methods --------------------------------------------------------------||
//-------------------------------------------------------------------------------||
/**
* Obtains the Thread Context ClassLoader
*/
static ClassLoader getThreadContextClassLoader() {
return AccessController.doPrivileged(GetTcclAction.INSTANCE);
}
static boolean isClassPresent(String name) {
try {
loadClass(name);
return true;
} catch (Exception e) {
return false;
}
}
static Class loadClass(String className) {
try {
return Class.forName(className, true, getThreadContextClassLoader());
} catch (ClassNotFoundException e) {
try {
return Class.forName(className, true, SecurityActions.class.getClassLoader());
} catch (ClassNotFoundException e2) {
throw new RuntimeException("Could not load class " + className, e2);
}
}
}
static T newInstance(final String className, final Class[] argumentTypes, final Object[] arguments,
final Class expectedType) {
@SuppressWarnings("unchecked")
Class implClass = (Class) loadClass(className);
if (!expectedType.isAssignableFrom(implClass)) {
throw new RuntimeException("Loaded class " + className + " is not of expected type " + expectedType);
}
return newInstance(implClass, argumentTypes, arguments);
}
static T newInstance(final String className, final Class[] argumentTypes, final Object[] arguments,
final Class expectedType, ClassLoader classLoader) {
Class clazz = null;
try {
clazz = Class.forName(className, false, classLoader);
} catch (Exception e) {
throw new RuntimeException("Could not load class " + className, e);
}
Object obj = newInstance(clazz, argumentTypes, arguments);
try {
return expectedType.cast(obj);
} catch (Exception e) {
throw new RuntimeException("Loaded class " + className + " is not of expected type " + expectedType, e);
}
}
/**
* Create a new instance by finding a constructor that matches the argumentTypes signature
* using the arguments for instantiation.
*
* @param implClass
* Full classname of class to create
* @param argumentTypes
* The constructor argument types
* @param arguments
* The constructor arguments
*
* @return a new instance
*
* @throws IllegalArgumentException
* if className, argumentTypes, or arguments are null
* @throws RuntimeException
* if any exceptions during creation
* @author Aslak Knutsen
* @author ALR
*/
static T newInstance(final Class implClass, final Class[] argumentTypes, final Object[] arguments) {
if (implClass == null) {
throw new IllegalArgumentException("ImplClass must be specified");
}
if (argumentTypes == null) {
throw new IllegalArgumentException("ArgumentTypes must be specified. Use empty array if no arguments");
}
if (arguments == null) {
throw new IllegalArgumentException("Arguments must be specified. Use empty array if no arguments");
}
final T obj;
try {
Constructor constructor = getConstructor(implClass, argumentTypes);
if (!constructor.isAccessible()) {
constructor.setAccessible(true);
}
obj = constructor.newInstance(arguments);
} catch (Exception e) {
throw new RuntimeException("Could not create new instance of " + implClass, e);
}
return obj;
}
/**
* Obtains the Constructor specified from the given Class and argument types
*
* @throws NoSuchMethodException
*/
static Constructor getConstructor(final Class clazz, final Class... argumentTypes)
throws NoSuchMethodException {
try {
return AccessController.doPrivileged(new PrivilegedExceptionAction>() {
public Constructor run() throws NoSuchMethodException {
return clazz.getDeclaredConstructor(argumentTypes);
}
});
}
// Unwrap
catch (final PrivilegedActionException pae) {
final Throwable t = pae.getCause();
// Rethrow
if (t instanceof NoSuchMethodException) {
throw (NoSuchMethodException) t;
} else {
// No other checked Exception thrown by Class.getConstructor
try {
throw (RuntimeException) t;
}
// Just in case we've really messed up
catch (final ClassCastException cce) {
throw new RuntimeException("Obtained unchecked Exception; this code should never be reached", t);
}
}
}
}
/**
* Set a single Field value
*
* @param target
* The object to set it on
* @param fieldName
* The field name
* @param value
* The new value
*/
public static void setFieldValue(final Class source, final Object target, final String fieldName,
final Object value) throws NoSuchFieldException {
try {
AccessController.doPrivileged(new PrivilegedExceptionAction() {
@Override
public Void run() throws Exception {
Field field = source.getDeclaredField(fieldName);
if (!field.isAccessible()) {
field.setAccessible(true);
}
field.set(target, value);
return null;
}
});
}
// Unwrap
catch (final PrivilegedActionException pae) {
final Throwable t = pae.getCause();
// Rethrow
if (t instanceof NoSuchFieldException) {
throw (NoSuchFieldException) t;
} else {
// No other checked Exception thrown by Class.getConstructor
try {
throw (RuntimeException) t;
}
// Just in case we've really messed up
catch (final ClassCastException cce) {
throw new RuntimeException("Obtained unchecked Exception; this code should never be reached", t);
}
}
}
}
public static List getFieldsWithAnnotation(final Class source,
final Class annotationClass) {
List declaredAccessableFields = AccessController.doPrivileged(new PrivilegedAction>() {
public List run() {
List foundFields = new ArrayList();
Class nextSource = source;
while (nextSource != Object.class) {
for (Field field : nextSource.getDeclaredFields()) {
if (field.isAnnotationPresent(annotationClass)) {
if (!field.isAccessible()) {
field.setAccessible(true);
}
foundFields.add(field);
}
}
nextSource = nextSource.getSuperclass();
}
return foundFields;
}
});
return declaredAccessableFields;
}
public static List getMethodsWithAnnotation(final Class source,
final Class annotationClass) {
List declaredAccessableMethods = AccessController.doPrivileged(new PrivilegedAction>() {
public List run() {
List foundMethods = new ArrayList();
Class nextSource = source;
while (nextSource != Object.class) {
for (Method method : filterBridgeMethods(nextSource.getDeclaredMethods())) {
if (method.isAnnotationPresent(annotationClass)) {
if (!method.isAccessible()) {
method.setAccessible(true);
}
foundMethods.add(method);
}
}
nextSource = nextSource.getSuperclass();
}
return foundMethods;
}
});
return declaredAccessableMethods;
}
static String getProperty(final String key) {
try {
String value = AccessController.doPrivileged(new PrivilegedExceptionAction() {
public String run() {
return System.getProperty(key);
}
});
return value;
}
// Unwrap
catch (final PrivilegedActionException pae) {
final Throwable t = pae.getCause();
// Rethrow
if (t instanceof SecurityException) {
throw (SecurityException) t;
}
if (t instanceof NullPointerException) {
throw (NullPointerException) t;
} else if (t instanceof IllegalArgumentException) {
throw (IllegalArgumentException) t;
} else {
// No other checked Exception thrown by System.getProtocolProperty
try {
throw (RuntimeException) t;
}
// Just in case we've really messed up
catch (final ClassCastException cce) {
throw new RuntimeException("Obtained unchecked Exception; this code should never be reached", t);
}
}
}
}
private static Collection filterBridgeMethods(Method... declaredMethods) {
final List nonBridgeMethods = new ArrayList(declaredMethods.length);
for (Method declaredMethod : declaredMethods) {
if (!declaredMethod.isBridge()) {
nonBridgeMethods.add(declaredMethod);
}
}
return nonBridgeMethods;
}
//-------------------------------------------------------------------------------||
// Inner Classes ----------------------------------------------------------------||
//-------------------------------------------------------------------------------||
/**
* Single instance to get the TCCL
*/
private enum GetTcclAction implements PrivilegedAction {
INSTANCE;
public ClassLoader run() {
return Thread.currentThread().getContextClassLoader();
}
}
}
