/*
* JBoss, Home of Professional Open Source
* Copyright 2009, 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.drone.webdriver.factory;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
/**
* 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>
* @author <a href="mailto:kpiwko@redhat.com">Karel Piwko</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);
}
}
}
}
static Class<?> getClass(final String className) {
if (className == null) {
throw new IllegalArgumentException("ClassName must be specified");
}
try {
final ClassLoader tccl = getThreadContextClassLoader();
return Class.forName(className, false, tccl);
} catch (ClassNotFoundException e) {
throw new IllegalStateException("Unable to find implementation class " + className
+ " on current classpath. Please make sure it is present on the classpath.");
}
}
/**
* 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 Class<?> implClass = getClass(className);
Constructor<?> constructor = getConstructor(implClass, argumentTypes);
obj = constructor.newInstance(arguments);
} catch (NoSuchMethodException e) {
throw new IllegalStateException("Unable to find a constructor for implementation class "
+ getConstructorName(className, argumentTypes)
+ ". Please make sure that you haven't misconfigured Arquillian Drone, "
+ "e.g. you set an implementationClass which does not match the field/parameter type in your code.");
} catch (IllegalArgumentException e) {
throw new IllegalStateException("Unable to instantiate a " + className
+ ". Please make sure that you haven't misconfigured Arquillian Drone, "
+ "e.g. you set an implementationClass which does not match the field/parameter type in your code.", e);
} catch (InstantiationException e) {
throw new IllegalStateException("Unable to instantiate a " + className
+ ". Please make sure that you haven't misconfigured Arquillian Drone, "
+ "e.g. you set an implementationClass which does not match the field/parameter type in your code.", e);
} catch (IllegalAccessException e) {
throw new IllegalStateException("Unable to instantiate a " + className
+ " instance, access refused by SecurityManager.", e);
} catch (InvocationTargetException e) {
throw new RuntimeException(
String.format("Unable to instantiate Drone via %s: %s",
getConstructorName(className, argumentTypes),
e.getCause()), // this provides the message of the ITE cause, which is also important!
e.getCause()); // this provides stack trace of the ITE cause
}
// Cast
try {
return expectedType.cast(obj);
} catch (final ClassCastException cce) {
// Reconstruct so we get some useful information
throw new ClassCastException("Unable to instantiate " + expectedType.getName()
+ " instance. Constructed object was type of " + obj.getClass().getName()
+ ", which is not compatible. Please make sure you haven't misconfigured Arquillian Drone.");
}
}
private static String getConstructorName(String className, final Class<?>[] argumentTypes) {
StringBuilder constructor = new StringBuilder(className).append("(");
for (Class<?> arg : argumentTypes) {
constructor.append(arg.getSimpleName()).append(",");
}
if (constructor.charAt(constructor.length() - 1) == ',') {
constructor.deleteCharAt(constructor.length() - 1);
}
constructor.append(")");
return constructor.toString();
}
// -------------------------------------------------------------------------------||
// Inner Classes
// ----------------------------------------------------------------||
// -------------------------------------------------------------------------------||
/**
* Single instance to get the TCCL
*/
private enum GetTcclAction implements PrivilegedAction<ClassLoader> {
INSTANCE;
public ClassLoader run() {
return Thread.currentThread().getContextClassLoader();
}
}
}