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/**
* JBoss, Home of Professional Open Source
* Copyright 2013, Red Hat, Inc. and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.arquillian.graphene.enricher;
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.List;
import org.jboss.arquillian.drone.api.annotation.Default;
import org.jboss.arquillian.drone.api.annotation.Qualifier;
/**
* SecurityActions
*
* A set of privileged actions that are not to leak out of this package
*
* @author ALR
* @version $Revision: $
*/
public final class ReflectionHelper {
// -------------------------------------------------------------------------------||
// Constructor ------------------------------------------------------------------||
// -------------------------------------------------------------------------------||
/**
* No instantiation
*/
private ReflectionHelper() {
throw new UnsupportedOperationException("No instantiation");
}
// -------------------------------------------------------------------------------||
// Utility Methods --------------------------------------------------------------||
// -------------------------------------------------------------------------------||
/**
* Obtains the Thread Context ClassLoader
*/
public static ClassLoader getThreadContextClassLoader() {
return AccessController.doPrivileged(GetTcclAction.INSTANCE);
}
/**
* Obtains the Constructor specified from the given Class and argument types
*
* @param clazz
* @param argumentTypes
* @return
* @throws NoSuchMethodException
*/
public static Constructor getConstructor(final Class clazz, final Class... argumentTypes)
throws NoSuchMethodException {
try {
return AccessController.doPrivileged(new PrivilegedExceptionAction>() {
@Override
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);
}
}
}
}
public static Constructor getAssignableConstructor(final Class clazz, final Class... argumentTypes) throws NoSuchMethodException {
for (Constructor constructor: clazz.getDeclaredConstructors()) {
if (constructor.getParameterTypes().length != argumentTypes.length) {
continue;
}
boolean found = true;
for (int i=0; i clazz, final Class... argumentTypes) {
try {
clazz.getDeclaredConstructor(argumentTypes);
return true;
} catch(NoSuchMethodException ignored) {
return false;
}
}
/**
* 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 Aslak Knutsen
* @author ALR
*/
public static T newInstance(final String className, final Class[] argumentTypes, final Object[] arguments,
final Class 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());
}
}
public static boolean isClassPresent(String name) {
try {
ClassLoader classLoader = getThreadContextClassLoader();
classLoader.loadClass(name);
return true;
} catch (ClassNotFoundException e) {
return false;
}
}
public static List getFields(final Class source) {
return AccessController.doPrivileged(new PrivilegedAction>() {
@Override
public List run() {
List foundFields = new ArrayList();
Class nextSource = source;
while (nextSource != Object.class) {
for (Field field : nextSource.getDeclaredFields()) {
foundFields.add(field);
}
nextSource = nextSource.getSuperclass();
}
return foundFields;
}
});
}
public static List getFieldsWithAnnotation(final Class source, final Class annotationClass) {
List declaredAccessableFields = AccessController.doPrivileged(new PrivilegedAction>() {
@Override
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 getFieldsWithAnnotatedAnnotation(final Class source, final Class annotationClass) {
List declaredAccessableFields = AccessController.doPrivileged(new PrivilegedAction>() {
@Override
public List run() {
List foundFields = new ArrayList();
Class nextSource = source;
while (nextSource != Object.class) {
for (Field field : nextSource.getDeclaredFields()) {
for (Annotation annotation : field.getAnnotations()) {
if (annotation.annotationType().isAnnotationPresent(annotationClass)) {
if (!field.isAccessible()) {
field.setAccessible(true);
}
foundFields.add(field);
break;
}
}
}
nextSource = nextSource.getSuperclass();
}
return foundFields;
}
});
return declaredAccessableFields;
}
public static List getMethodsWithAnnotation(final Class source, final Class annotationClass) {
List declaredAccessableMethods = AccessController.doPrivileged(new PrivilegedAction>() {
@Override
public List run() {
List foundMethods = new ArrayList();
for (Method method : source.getDeclaredMethods()) {
if (method.isAnnotationPresent(annotationClass)) {
if (!method.isAccessible()) {
method.setAccessible(true);
}
foundMethods.add(method);
}
}
return foundMethods;
}
});
return declaredAccessableMethods;
}
/**
* Returns all couples of found parameter annotated with the given annotation and an array of all annotations the
* parameter is annotated with for the given method
*
* @param method - the method where the parameters should be examined
* @param annotationClass - the annotation the parameters should be annotated with
* @return list of couples in an object array that consist of found parameter annotated with the given annotation
* and an array of all annotations the parameter is annotated with
*/
public static List getParametersWithAnnotation(final Method method,
final Class annotationClass) {
List declaredParameters = AccessController
.doPrivileged(new PrivilegedAction>() {
public List run() {
List foundParameters = new ArrayList();
Class[] parameterTypes = method.getParameterTypes();
Annotation[][] parameterAnnotations = method.getParameterAnnotations();
for (int i = 0; i < parameterTypes.length; i++) {
if (isAnnotationPresent(parameterAnnotations[i], annotationClass)) {
foundParameters.add(new Object[]{parameterTypes[i], parameterAnnotations[i]});
} else {
foundParameters.add(null);
}
}
return foundParameters;
}
});
return declaredParameters;
}
/**
* Checks if some annotation is present in the given array of annotations
*
* @param annotations - array of annotations
* @param needle - annotation we are looking for
* @return if the annotation is present an the given array of annotations
*/
private static boolean isAnnotationPresent(final Annotation[] annotations, final Class needle) {
return findAnnotation(annotations, needle) != null;
}
/**
* Finds some annotation in the given array of annotations
*
* @param annotations - array of annotations
* @param needle - annotation we are looking for
* @return the found annotation
*/
@SuppressWarnings("unchecked")
public static T findAnnotation(final Annotation[] annotations, final Class needle) {
for (Annotation annotation : annotations) {
if (annotation.annotationType() == needle) {
return (T) annotation;
}
}
return null;
}
// method from Drone, SecurityActions
public static Class getQualifier(Annotation[] annotations) {
if (annotations == null) {
return Default.class;
}
List> candidates = new ArrayList>();
for (Annotation a : annotations) {
if (a.annotationType().isAnnotationPresent(Qualifier.class)) {
candidates.add(a.annotationType());
}
}
if (candidates.isEmpty()) {
return Default.class;
} else if (candidates.size() == 1) {
return candidates.get(0);
}
throw new IllegalStateException("Unable to determine Qualifier, multiple (" + candidates.size()
+ ") Qualifier annotations were present");
}
// -------------------------------------------------------------------------------||
// Inner Classes ----------------------------------------------------------------||
// -------------------------------------------------------------------------------||
/**
* Single instance to get the TCCL
*/
private enum GetTcclAction implements PrivilegedAction {
INSTANCE;
@Override
public ClassLoader run() {
return Thread.currentThread().getContextClassLoader();
}
}
}
