content: /**
   * Copyright (c) 2018-2019, Mihai Emil Andronache
   * All rights reserved.
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   * 1)Redistributions of source code must retain the above copyright notice,
   * this list of conditions and the following disclaimer.
   * 2)Redistributions in binary form must reproduce the above copyright notice,
   * this list of conditions and the following disclaimer in the documentation
   * and/or other materials provided with the distribution.
   * 3)Neither the name of docker-java-api nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   */
  package com.amihaiemil.docker;
  
  import org.apache.http.HttpStatus;
  import org.apache.http.client.HttpClient;
  import org.apache.http.client.methods.HttpGet;
  
  import java.io.IOException;
  import java.net.URI;
  
  /**
   * System API.
   *
   * @author Boris Kuzmic (boris.kuzmic@gmail.com)
   * @since 0.0.6
   */
  final class RtDockerSystem implements DockerSystem {
  
      /**
       * Apache HttpClient which sends the requests.
       */
      private final HttpClient client;
  
      /**
       * Base URI.
       */
      private final URI baseUri;
  
      /**
       * Docker engine.
       */
      private Docker docker;
  
      /**
       * Ctor.
       *
       * @param client Given HTTP Client.
       * @param baseUri Base URI, ending with /system.
       * @param dkr The Docker engine.
       */
      RtDockerSystem(
          final HttpClient client, final URI baseUri, final Docker dkr
      ) {
          this.client = client;
          this.baseUri = baseUri;
          this.docker = dkr;
      }
  
      @Override
      public DiskSpaceInfo diskUsage()
          throws IOException, UnexpectedResponseException {
          final HttpGet init = new HttpGet(this.baseUri.toString() + "/df");
          try {
              return new SystemDiskSpaceInfo(
                  this.client.execute(
                      init,
                      new ReadJsonObject(
                          new MatchStatus(
                              init.getURI(),
                              HttpStatus.SC_OK
                          )
                      )
                  )
              );
          } finally {
              init.releaseConnection();
          }
      }
  
  }
  