/*
* JBoss, Home of Professional Open Source
* Copyright 2012, Red Hat Middleware LLC, and individual 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.warp.impl.testutils;
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.Arrays;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
/**
* SecurityActions
* <p>
* A set of privileged actions that are not to leak out of this package
*
* @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a>
* @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);
}
/**
* 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<Constructor<?>>() {
public Constructor<?> run() throws NoSuchMethodException {
return clazz.getConstructor(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);
}
}
}
}
/**
* Create a new instance by finding a constructor that matches the argumentTypes signature using the arguments for
* instantiation.
*
* @param className
* 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 <a href="mailto:aslak@conduct.no">Aslak Knutsen</a>
* @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a>
*/
static <T> T newInstance(final String className, final Class<?>[] argumentTypes, final Object[] arguments,
final Class<T> expectedType) {
if (className == null) {
throw new IllegalArgumentException("ClassName 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 Object obj;
try {
final ClassLoader tccl = getThreadContextClassLoader();
final Class<?> implClass = Class.forName(className, false, tccl);
Constructor<?> constructor = getConstructor(implClass, argumentTypes);
obj = constructor.newInstance(arguments);
} catch (Exception e) {
throw new RuntimeException(
"Could not create new instance of " + className + ", missing package from classpath?", e);
}
// Cast
try {
return expectedType.cast(obj);
} catch (final ClassCastException cce) {
// Reconstruct so we get some useful information
throw new ClassCastException("Incorrect expected type, " + expectedType.getName() + ", defined for "
+ obj.getClass().getName());
}
}
static boolean isClassPresent(String name) {
try {
ClassLoader classLoader = getThreadContextClassLoader();
classLoader.loadClass(name);
return true;
} catch (ClassNotFoundException e) {
return false;
}
}
static List<Field> getFieldsWithAnnotation(final Class<?> source, final Class<? extends Annotation> annotationClass) {
List<Field> declaredAccessableFields = AccessController.doPrivileged(new PrivilegedAction<List<Field>>() {
public List<Field> run() {
List<Field> foundFields = new ArrayList<Field>();
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;
}
static List<Method> getMethodsWithAnnotation(final Class<?> source,
final Class<? extends Annotation> annotationClass) {
List<Method> declaredAccessableMethods = AccessController.doPrivileged(new PrivilegedAction<List<Method>>() {
public List<Method> run() {
List<Method> foundMethods = new ArrayList<Method>();
Class<?> nextSource = source;
while (nextSource != Object.class) {
for (Method method : nextSource.getDeclaredMethods()) {
if (method.isAnnotationPresent(annotationClass)) {
if (!method.isAccessible()) {
method.setAccessible(true);
}
foundMethods.add(method);
}
}
nextSource = nextSource.getSuperclass();
}
return foundMethods;
}
});
return declaredAccessableMethods;
}
static List<Method> getMethodsWithAnnotation(final Class<?> source, final Annotation annotation) {
Class<? extends Annotation> annotationType = annotation.annotationType();
List<Method> declaredAccessableMethods = getMethodsWithAnnotation(source, annotationType);
Set<Method> result = new HashSet<Method>(declaredAccessableMethods);
for (Method method : declaredAccessableMethods) {
Annotation methodAnnotation = method.getAnnotation(annotationType);
for (Method parameter : annotationType.getMethods()) {
if (parameter.getDeclaringClass() == annotationType) {
Object annotationValue = invokeSafely(methodAnnotation, parameter);
Object referenceValue = invokeSafely(annotation, parameter);
if (!annotationValue.equals(referenceValue)) {
result.remove(method);
}
}
}
}
return new LinkedList<Method>(result);
}
@SuppressWarnings("unused")
private static Method getMethodSafely(Class<?> clazz, String methodName, Class<?>... params) {
try {
return clazz.getMethod(methodName, params);
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
private static Object invokeSafely(Object instance, Method method, Object... args) {
try {
return method.invoke(instance, args);
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
static List<Field> getFields(final Class<?> source) {
List<Field> declaredAccessableFields = AccessController.doPrivileged(new PrivilegedAction<List<Field>>() {
public List<Field> run() {
List<Field> foundFields = new ArrayList<Field>();
Class<?> nextSource = source;
while (nextSource != Object.class) {
for (Field field : nextSource.getDeclaredFields()) {
if (!field.isAccessible()) {
field.setAccessible(true);
}
foundFields.add(field);
}
nextSource = nextSource.getSuperclass();
}
return foundFields;
}
});
return declaredAccessableFields;
}
static boolean isAnnotationPresent(final Annotation[] annotations, final Class<? extends Annotation> needle) {
for (Annotation a : annotations) {
if (a.annotationType() == needle) {
return true;
}
}
return false;
}
/**
* Get all subclasses and interfaces in whole class hierarchy
*/
static Class<?>[] getAncestors(Class<?> clazz) {
Set<Class<?>> classes = new HashSet<Class<?>>();
while (clazz != null) {
classes.add(clazz);
if (clazz.getSuperclass() != null) {
classes.add(clazz.getSuperclass());
}
classes.addAll(Arrays.asList(clazz.getInterfaces()));
for (Class<?> interfaze : clazz.getInterfaces()) {
classes.addAll(Arrays.asList(getAncestors(interfaze)));
}
clazz = clazz.getSuperclass();
}
return classes.toArray(new Class<?>[classes.size()]);
}
// -------------------------------------------------------------------------------||
// Inner Classes
// ----------------------------------------------------------------||
// -------------------------------------------------------------------------------||
/**
* Single instance to get the TCCL
*/
private enum GetTcclAction implements PrivilegedAction<ClassLoader> {
INSTANCE;
public ClassLoader run() {
return Thread.currentThread().getContextClassLoader();
}
}
}