/*
* Copyright 1999-2017 Alibaba Group Holding Ltd.
*
* 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 com.alibaba.druid.support.logging;
/**
* A class to simplify access to resources through the classloader.
*/
public final class Resources extends Object {
private static ClassLoader defaultClassLoader;
private Resources(){
}
/**
* Returns the default classloader (may be null).
*
* @return The default classloader
*/
public static ClassLoader getDefaultClassLoader() {
return defaultClassLoader;
}
/**
* Sets the default classloader
*
* @param defaultClassLoader - the new default ClassLoader
*/
public static void setDefaultClassLoader(ClassLoader defaultClassLoader) {
Resources.defaultClassLoader = defaultClassLoader;
}
/**
* Loads a class
*
* @param className - the class to load
* @return The loaded class
* @throws ClassNotFoundException If the class cannot be found (duh!)
*/
public static Class<?> classForName(String className) throws ClassNotFoundException {
Class<?> clazz = null;
try {
clazz = getClassLoader().loadClass(className);
} catch (Exception e) {
// Ignore. Failsafe below.
}
if (clazz == null) {
clazz = Class.forName(className);
}
return clazz;
}
private static ClassLoader getClassLoader() {
if (defaultClassLoader != null) {
return defaultClassLoader;
} else {
return Thread.currentThread().getContextClassLoader();
}
}
}