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    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF 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
   *
   *   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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
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  package org.apache.hc.client5.testing.extension.async;
  
  import java.util.Collection;
  
  import org.apache.hc.client5.http.AuthenticationStrategy;
  import org.apache.hc.client5.http.auth.AuthSchemeFactory;
  import org.apache.hc.client5.http.impl.async.CloseableHttpAsyncClient;
  import org.apache.hc.client5.http.impl.async.H2AsyncClientBuilder;
  import org.apache.hc.client5.http.ssl.DefaultClientTlsStrategy;
  import org.apache.hc.client5.testing.SSLTestContexts;
  import org.apache.hc.core5.http.Header;
  import org.apache.hc.core5.http.HttpRequestInterceptor;
  import org.apache.hc.core5.http.HttpResponseInterceptor;
  import org.apache.hc.core5.http.config.Lookup;
  import org.apache.hc.core5.http.nio.ssl.TlsStrategy;
  import org.apache.hc.core5.http2.config.H2Config;
  import org.apache.hc.core5.reactor.IOReactorConfig;
  import org.apache.hc.core5.util.Timeout;
  
  final class H2OnlyTestClientBuilder implements TestAsyncClientBuilder {
  
      private final H2AsyncClientBuilder clientBuilder;
  
      private Timeout timeout;
      private TlsStrategy tlsStrategy;
      private H2Config h2Config;
  
      public H2OnlyTestClientBuilder() {
          this.clientBuilder = H2AsyncClientBuilder.create();
      }
  
      @Override
      public ClientProtocolLevel getProtocolLevel() {
          return ClientProtocolLevel.H2_ONLY;
      }
  
      @Override
      public TestAsyncClientBuilder setTimeout(final Timeout timeout) {
          this.timeout = timeout;
          return this;
      }
  
      @Override
      public TestAsyncClientBuilder addResponseInterceptorFirst(final HttpResponseInterceptor interceptor) {
          this.clientBuilder.addResponseInterceptorFirst(interceptor);
          return this;
      }
  
      @Override
      public TestAsyncClientBuilder addResponseInterceptorLast(final HttpResponseInterceptor interceptor) {
          this.clientBuilder.addResponseInterceptorLast(interceptor);
          return this;
      }
  
      @Override
      public TestAsyncClientBuilder addRequestInterceptorFirst(final HttpRequestInterceptor interceptor) {
          this.clientBuilder.addRequestInterceptorFirst(interceptor);
          return this;
      }
  
      @Override
      public TestAsyncClientBuilder addRequestInterceptorLast(final HttpRequestInterceptor interceptor) {
          this.clientBuilder.addRequestInterceptorLast(interceptor);
          return this;
      }
  
      @Override
      public TestAsyncClientBuilder setTlsStrategy(final TlsStrategy tlsStrategy) {
          this.tlsStrategy = tlsStrategy;
          return this;
      }
  
     @Override
     public TestAsyncClientBuilder setH2Config(final H2Config h2Config) {
         this.h2Config = h2Config;
         return this;
     }
 
     @Override
     public TestAsyncClientBuilder setDefaultHeaders(final Collection<? extends Header> defaultHeaders) {
         this.clientBuilder.setDefaultHeaders(defaultHeaders);
         return this;
     }
 
     @Override
     public TestAsyncClientBuilder setTargetAuthenticationStrategy(final AuthenticationStrategy targetAuthStrategy) {
         this.clientBuilder.setTargetAuthenticationStrategy(targetAuthStrategy);
         return this;
     }
 
     @Override
     public TestAsyncClientBuilder setDefaultAuthSchemeRegistry(final Lookup<AuthSchemeFactory> authSchemeRegistry) {
         this.clientBuilder.setDefaultAuthSchemeRegistry(authSchemeRegistry);
         return this;
     }
 
     @Override
     public TestAsyncClient build() throws Exception {
         final CloseableHttpAsyncClient client = clientBuilder
                 .setTlsStrategy(tlsStrategy != null ? tlsStrategy : new DefaultClientTlsStrategy(SSLTestContexts.createClientSSLContext()))
                 .setIOReactorConfig(IOReactorConfig.custom()
                         .setSoTimeout(timeout)
                         .build())
                 .setH2Config(h2Config)
                 .build();
         return new TestAsyncClient(client, null);
     }
 
 }