content: /*
   * Copyright (c) 2019 abc123lzf <abc123lzf@126.com>
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  package com.lzf.flyingsocks.encrypt;
  
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  @SuppressWarnings("all")
  public abstract class EncryptSupport {
  
      private static final Map<String, Class<? extends EncryptProvider>> providers = new ConcurrentHashMap<>(8);
  
      private static void registerEncryptProvider(Class<? extends EncryptProvider> clazz) throws Exception {
          EncryptProvider instance = clazz.newInstance();
          providers.put(instance.getName().toLowerCase(), clazz);
      }
  
      static {
          try {
              registerEncryptProvider(JksSSLEncryptProvider.class);
              registerEncryptProvider(OpenSSLEncryptProvider.class);
          } catch (Exception e) {
              throw new Error(e);
          }
      }
  
      /**
       * 查找对应的加密Handler提供对象
       *
       * @param name 加密方式
       * @return EncryptProvider对象
       */
      public static EncryptProvider lookupProvider(String name) {
          Class<? extends EncryptProvider> provider = providers.get(name.toLowerCase());
          if (provider != null) {
              try {
                  return provider.newInstance();
              } catch (InstantiationException | IllegalAccessException e) {
                  throw new Error(e); //Should not be happened.
              }
          } else {
              throw new IllegalArgumentException("EncryptProvider " + name + " not found");
          }
      }
  
      public static <T extends EncryptProvider> T lookupProvider(String name, Class<T> type) {
          EncryptProvider p = lookupProvider(name);
          if (p.getClass() == type) {
              return (T) p;
          } else {
              throw new ClassCastException();
          }
      }
  
  
      private EncryptSupport() {
          throw new UnsupportedOperationException();
      }
  
  }
  