/*
    * Copyright 2018 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty5.channel;
  
  import io.netty5.util.internal.StringUtil;
  
  import java.lang.reflect.Constructor;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * A {@link ChannelFactory} that instantiates a new {@link ServerChannel} by invoking its default constructor
   * reflectively.
   */
  public final class ReflectiveServerChannelFactory<T extends ServerChannel> implements ServerChannelFactory<T> {
  
      private final Constructor<? extends T> constructor;
  
      public ReflectiveServerChannelFactory(Class<? extends T> clazz) {
          requireNonNull(clazz, "clazz");
          try {
              this.constructor = clazz.getConstructor(EventLoop.class, EventLoopGroup.class);
          } catch (NoSuchMethodException e) {
              throw new IllegalArgumentException("Class " + StringUtil.simpleClassName(clazz) +
                      " does not have a public constructor that takes an EventLoop and EventLoopGroup instance", e);
          }
      }
  
      @Override
      public T newChannel(EventLoop eventLoop, EventLoopGroup childEventLoopGroup) {
          try {
              return constructor
                      .newInstance(eventLoop, childEventLoopGroup);
          } catch (Throwable t) {
              throw new ChannelException(
                      "Unable to create ServerChannel from class " + constructor.getDeclaringClass(), t);
          }
      }
  
      @Override
      public String toString() {
          return StringUtil.simpleClassName(ReflectiveServerChannelFactory.class) +
                  '(' + StringUtil.simpleClassName(constructor.getDeclaringClass()) + ".class)";
      }
  }