content: /*
   * Copyright 1999-2020 Alibaba Group Holding Ltd.
   *
   * Licensed 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
   *
   *      http://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 com.alibaba.nacos.naming.core.v2.client;
  
  import java.io.Serializable;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * Client data attributes.
   *
   * @author xiweng.yy
   */
  public class ClientAttributes implements Serializable {
      
      private static final long serialVersionUID = -5794675800507288793L;
      
      private Map<String, Object> clientAttributes;
      
      public ClientAttributes() {
          this.clientAttributes = new HashMap<>(1);
      }
      
      public Map<String, Object> getClientAttributes() {
          return clientAttributes;
      }
      
      public void setClientAttributes(Map<String, Object> clientAttributes) {
          this.clientAttributes = clientAttributes;
      }
      
      public void addClientAttribute(String key, Object value) {
          clientAttributes.put(key, value);
      }
      
      /**
       * Get client attribute.
       *
       * @param key attribute key.
       * @param <T> Expected type of attribute.
       * @return client attribute, if not exist or type can't case, return {@code null}
       */
      public <T> T getClientAttribute(String key) {
          try {
              return (T) clientAttributes.get(key);
          } catch (Exception e) {
              return null;
          }
      }
      
      /**
       * Get client attribute.
       *
       * @param key attribute key.
       * @param <T> Expected type of attribute.
       * @param defaultValue default value when not exist or type can't case
       * @return client attribute, if not exist or type can't case, return defaultValue
       */
      public <T> T getClientAttribute(String key, T defaultValue) {
          Object result = clientAttributes.get(key);
          if (null == result) {
              return defaultValue;
          }
          try {
              return (T) result;
          } catch (Exception e) {
              return defaultValue;
          }
      }
  }
  