content: /*
   * Copyright 1999-2018 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.common.http.client;
  
  import com.alibaba.nacos.common.http.client.request.HttpClientRequest;
  import com.alibaba.nacos.common.http.client.response.HttpClientResponse;
  import com.alibaba.nacos.common.model.RequestHttpEntity;
  
  import java.io.IOException;
  import java.net.URI;
  import java.util.Iterator;
  
  /**
   * Wrap http client request and perform corresponding interception.
   *
   * @author mai.jh
   */
  public class InterceptingHttpClientRequest implements HttpClientRequest {
      
      private final HttpClientRequest httpClientRequest;
      
      private final Iterator<HttpClientRequestInterceptor> interceptors;
      
      public InterceptingHttpClientRequest(HttpClientRequest httpClientRequest,
              Iterator<HttpClientRequestInterceptor> interceptors) {
          this.httpClientRequest = httpClientRequest;
          this.interceptors = interceptors;
      }
      
      @Override
      public HttpClientResponse execute(URI uri, String httpMethod, RequestHttpEntity requestHttpEntity)
              throws Exception {
          while (interceptors.hasNext()) {
              HttpClientRequestInterceptor nextInterceptor = interceptors.next();
              if (nextInterceptor.isIntercept(uri, httpMethod, requestHttpEntity)) {
                  return nextInterceptor.intercept();
              }
          }
          return httpClientRequest.execute(uri, httpMethod, requestHttpEntity);
      }
      
      @Override
      public void close() throws IOException {
          httpClientRequest.close();
      }
  }
  