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   /*
    * Copyright 2014 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.netty.handler.proxy;
  
  import io.netty.util.internal.ObjectUtil;
  import io.netty.util.internal.StringUtil;
  
  import java.net.SocketAddress;
  
  public final class ProxyConnectionEvent {
  
      private final String protocol;
      private final String authScheme;
      private final SocketAddress proxyAddress;
      private final SocketAddress destinationAddress;
      private String strVal;
  
      /**
       * Creates a new event that indicates a successful connection attempt to the destination address.
       */
      public ProxyConnectionEvent(
              String protocol, String authScheme, SocketAddress proxyAddress, SocketAddress destinationAddress) {
          this.protocol = ObjectUtil.checkNotNull(protocol, "protocol");
          this.authScheme = ObjectUtil.checkNotNull(authScheme, "authScheme");
          this.proxyAddress = ObjectUtil.checkNotNull(proxyAddress, "proxyAddress");
          this.destinationAddress = ObjectUtil.checkNotNull(destinationAddress, "destinationAddress");
      }
  
      /**
       * Returns the name of the proxy protocol in use.
       */
      public String protocol() {
          return protocol;
      }
  
      /**
       * Returns the name of the authentication scheme in use.
       */
      public String authScheme() {
          return authScheme;
      }
  
      /**
       * Returns the address of the proxy server.
       */
      @SuppressWarnings("unchecked")
      public <T extends SocketAddress> T proxyAddress() {
          return (T) proxyAddress;
      }
  
      /**
       * Returns the address of the destination.
       */
      @SuppressWarnings("unchecked")
      public <T extends SocketAddress> T destinationAddress() {
          return (T) destinationAddress;
      }
  
      @Override
      public String toString() {
          if (strVal != null) {
              return strVal;
          }
  
          StringBuilder buf = new StringBuilder(128)
              .append(StringUtil.simpleClassName(this))
              .append('(')
              .append(protocol)
              .append(", ")
              .append(authScheme)
              .append(", ")
              .append(proxyAddress)
              .append(" => ")
              .append(destinationAddress)
              .append(')');
  
          return strVal = buf.toString();
      }
  }