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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.codec.mqtt;
  
  import io.netty.util.internal.StringUtil;
  
  import java.util.Collections;
  import java.util.List;
  
  /**
   * Payload of the {@link MqttUnsubscribeMessage}
   */
  public final class MqttUnsubscribePayload {
  
      private final List<String> topics;
  
      public MqttUnsubscribePayload(List<String> topics) {
          this.topics = Collections.unmodifiableList(topics);
      }
  
      public List<String> topics() {
          return topics;
      }
  
      @Override
      public String toString() {
          StringBuilder builder = new StringBuilder(StringUtil.simpleClassName(this)).append('[');
          for (int i = 0; i < topics.size(); i++) {
              builder.append("topicName = ").append(topics.get(i)).append(", ");
          }
          if (!topics.isEmpty()) {
              builder.setLength(builder.length() - 2);
          }
          return builder.append("]").toString();
      }
  }