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.api.remote.request;
  
  import com.alibaba.nacos.api.remote.Payload;
  import java.util.Map;
  import java.util.TreeMap;
  
  /**
   * Request.
   *
   * @author liuzunfei
   */
  @SuppressWarnings("PMD.AbstractClassShouldStartWithAbstractNamingRule")
  public abstract class Request implements Payload {
      
      private final Map<String, String> headers = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
      
      private String requestId;
      
      /**
       * put header.
       *
       * @param key   key of value.
       * @param value value.
       */
      public void putHeader(String key, String value) {
          headers.put(key, value);
      }
      
      /**
       * put headers .
       *
       * @param headers headers to put.
       */
      public void putAllHeader(Map<String, String> headers) {
          if (headers == null || headers.isEmpty()) {
              return;
          }
          this.headers.putAll(headers);
      }
      
      /**
       * get a header value .
       *
       * @param key key of value.
       * @return return value of key. return null if not exist.
       */
      public String getHeader(String key) {
          return headers.get(key);
      }
      
      /**
       * get a header value of default value.
       *
       * @param key          key of value.
       * @param defaultValue default value if key is not exist.
       * @return return final value.
       */
      public String getHeader(String key, String defaultValue) {
          String value = headers.get(key);
          return (value == null) ? defaultValue : value;
      }
      
      /**
       * Getter method for property <tt>requestId</tt>.
       *
       * @return property value of requestId
       */
      public String getRequestId() {
          return requestId;
      }
      
      /**
       * Setter method for property <tt>requestId</tt>.
       *
       * @param requestId value to be assigned to property requestId
       */
      public void setRequestId(String requestId) {
          this.requestId = requestId;
      }
      
      /**
       * Getter method for property <tt>type</tt>.
       *
       * @return property value of type
       */
      public abstract String getModule();
      
      /**
       * Getter method for property <tt>headers</tt>.
       *
       * @return property value of headers
       */
      public Map<String, String> getHeaders() {
          return headers;
      }
      
      public void clearHeaders() {
          this.headers.clear();
      }
      
      @Override
      public String toString() {
          return this.getClass().getSimpleName() + "{" + "headers=" + headers + ", requestId='" + requestId + '\'' + '}';
      }
  }
  