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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.cxf.common.util;
import java.beans.BeanInfo;
import java.beans.PropertyDescriptor;
import java.io.File;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.net.*;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.*;
import org.apache.cxf.common.classloader.ClassLoaderUtils;
public final class ReflectionUtil {
private static Method springBeanUtilsDescriptorFetcher;
private static boolean springChecked;
private ReflectionUtil() {
// intentionally empty
}
public static Field getDeclaredField(final Class cls, final String name) {
return AccessController.doPrivileged(new PrivilegedAction() {
public Field run() {
try {
return cls.getDeclaredField(name);
} catch (SecurityException e) {
return null;
} catch (NoSuchFieldException e) {
return null;
}
}
});
}
public static Constructor getDeclaredConstructor(final Class cls, final Class ... args) {
return AccessController.doPrivileged(new PrivilegedAction() {
public Constructor run() {
try {
return cls.getDeclaredConstructor(args);
} catch (SecurityException e) {
return null;
} catch (NoSuchMethodException e) {
return null;
}
}
});
}
public static Constructor getConstructor(final Class cls, final Class ... args) {
return AccessController.doPrivileged(new PrivilegedAction() {
public Constructor run() {
try {
return cls.getConstructor(args);
} catch (SecurityException e) {
return null;
} catch (NoSuchMethodException e) {
return null;
}
}
});
}
public static Method[] getDeclaredMethods(final Class cls) {
return AccessController.doPrivileged(new PrivilegedAction() {
public Method[] run() {
return cls.getDeclaredMethods();
}
});
}
public static Field[] getDeclaredFields(final Class cls) {
return AccessController.doPrivileged(new PrivilegedAction() {
public Field[] run() {
return cls.getDeclaredFields();
}
});
}
public static T setAccessible(final T o) {
return AccessController.doPrivileged(new PrivilegedAction() {
public T run() {
o.setAccessible(true);
return o;
}
});
}
public static T setAccessible(final T o, final boolean b) {
return AccessController.doPrivileged(new PrivilegedAction() {
public T run() {
o.setAccessible(b);
return o;
}
});
}
public static List getPackagesFromJar(File jarFile) throws IOException {
List packageNames = new ArrayList();
if (jarFile.isDirectory()) {
getPackageNamesFromDir(jarFile, jarFile, packageNames);
} else {
JarResource resource = new JarResource();
for (String item : resource.getJarContents(jarFile)) {
if (!item.endsWith(".class")) {
continue;
}
String packageName = getPackageName(item);
if (!StringUtils.isEmpty(packageName)
&& !packageNames.contains(packageName)) {
packageNames.add(packageName);
}
}
}
return packageNames;
}
private static void getPackageNamesFromDir(File base, File dir, List pkgs) {
boolean foundClass = false;
for (File file : dir.listFiles()) {
if (file.isDirectory()) {
getPackageNamesFromDir(base, file, pkgs);
} else if (!foundClass && file.getName().endsWith(".class")) {
foundClass = true;
String pkg = "";
file = dir;
while (!file.equals(base)) {
if (!"".equals(pkg)) {
pkg = "." + pkg;
}
pkg = file.getName() + pkg;
file = file.getParentFile();
}
if (!pkgs.contains(pkg)) {
pkgs.add(pkg);
}
}
}
}
private static String getPackageName(String clzName) {
if (clzName.indexOf("/") == -1) {
return null;
}
String packageName = clzName.substring(0, clzName.lastIndexOf("/"));
return packageName.replace("/", ".");
}
/**
* create own array of property descriptors to:
*
* - prevent memory leaks by Introspector's cache
* - get correct type for generic properties from superclass
* that are limited to a specific type in beanClass
* see http://bugs.sun.com/view_bug.do?bug_id=6528714
* we cannot use BeanUtils.getPropertyDescriptors because of issue SPR-6063
*
* @param refClass calling class for class loading.
* @param beanInfo Bean in question
* @param beanClass class for bean in question
* @param propertyDescriptors raw descriptors
* @return
*/
public static PropertyDescriptor[] getPropertyDescriptorsAvoidSunBug(Class refClass,
BeanInfo beanInfo,
Class beanClass,
PropertyDescriptor[] propertyDescriptors) {
if (!springChecked) {
try {
springChecked = true;
Class cls = ClassLoaderUtils
.loadClass("org.springframework.beans.BeanUtils", refClass);
springBeanUtilsDescriptorFetcher
= cls.getMethod("getPropertyDescriptor", new Class[] {Class.class, String.class});
} catch (Exception e) {
//ignore - just assume it's an unsupported/unknown annotation
}
}
if (springBeanUtilsDescriptorFetcher != null) {
PropertyDescriptor[] descriptors = null;
if (propertyDescriptors != null) {
descriptors = new PropertyDescriptor[propertyDescriptors.length];
for (int i = 0; i < propertyDescriptors.length; i++) {
PropertyDescriptor propertyDescriptor = propertyDescriptors[i];
try {
descriptors[i] =
(PropertyDescriptor)
springBeanUtilsDescriptorFetcher.invoke(null,
beanClass,
propertyDescriptor.getName());
} catch (IllegalArgumentException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
}
}
}
return descriptors;
} else {
return beanInfo.getPropertyDescriptors();
}
}
/**
* Try to find a method we can use. If the object implements a public
* interface that has the public version of that method, we'll use the interface
* defined method in case the actual instance class is not public
*/
public static Method findMethod(Class cls,
String name,
Class ... params) {
if (cls == null) {
return null;
}
for (Class cs : cls.getInterfaces()) {
if (Modifier.isPublic(cs.getModifiers())) {
Method m = findMethod(cs, name, params);
if (m != null && Modifier.isPublic(m.getModifiers())) {
return m;
}
}
}
try {
Method m = cls.getDeclaredMethod(name, params);
if (m != null && Modifier.isPublic(m.getModifiers())) {
return m;
}
} catch (Exception e) {
//ignore
}
Method m = findMethod(cls.getSuperclass(), name, params);
if (m == null) {
try {
m = cls.getMethod(name, params);
} catch (Exception e) {
//ignore
}
}
return m;
}
/**
* Look for a specified annotation on a method. If there, return it. If not, search it's containing class.
* Assume that the annotation is marked @Inherited.
*
* @param m method to examine
* @param annotationType the annotation type to look for.
* @return
*/
public static T getAnnotationForMethodOrContainingClass(Method m,
Class annotationType) {
T annotation = m.getAnnotation(annotationType);
if (annotation != null) {
return annotation;
}
return m.getDeclaringClass().getAnnotation(annotationType);
}
}