content: /*
   * Copyright 1999-2018 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();
          }
      }
  
  }
  