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   /*
    * Copyright 2020 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.example.stomp.websocket;
  
  import io.netty.channel.Channel;
  import io.netty.util.internal.ObjectUtil;
  
  public final class StompSubscription {
  
      private final String id;
      private final String destination;
      private final Channel channel;
  
      public StompSubscription(String id, String destination, Channel channel) {
          this.id = ObjectUtil.checkNotNull(id, "id");
          this.destination = ObjectUtil.checkNotNull(destination, "destination");
          this.channel = ObjectUtil.checkNotNull(channel, "channel");
      }
  
      public String id() {
          return id;
      }
  
      public String destination() {
          return destination;
      }
  
      public Channel channel() {
          return channel;
      }
  
      @Override
      public boolean equals(Object obj) {
          if (this == obj) {
              return true;
          }
  
          if (obj == null || getClass() != obj.getClass()) {
              return false;
          }
  
          StompSubscription that = (StompSubscription) obj;
  
          if (!id.equals(that.id)) {
              return false;
          }
  
          if (!destination.equals(that.destination)) {
              return false;
          }
  
          return channel.equals(that.channel);
      }
  
      @Override
      public int hashCode() {
          int result = id.hashCode();
          result = 31 * result + destination.hashCode();
          result = 31 * result + channel.hashCode();
          return result;
      }
  }