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 javax.json.JsonArray;
  import javax.json.JsonObject;
  import java.io.IOException;
  import java.util.Iterator;
  import java.util.function.Function;
  import java.util.stream.Collectors;
  
  /**
   * Iterator over Docker resources (Containers, Images etc).
   * @author Mihai Andronache (amihaiemil@gmail.com)
   * @version $Id: 893797afc4995ba4b14845af47b212f17bf0fee1 $
   * @since 0.0.1
   * @param <T> The Json resoure (Image, Container etc) returned by the API.
   */
  final class ResourcesIterator<T extends JsonObject> implements Iterator<T> {
  
      /**
       * Iterated resources.
       */
      private final Iterator<T> resources;
  
      /**
       * Ctor.
       * @param client Used HTTP Client.
       * @param request HTTP Request.
       * @param mapper Function which should map the received JsonObject
       *  to the specified resource.
       */
      ResourcesIterator(
          final HttpClient client, final HttpGet request,
          final Function<JsonObject, T> mapper
      ) {
          try {
              final JsonArray array = client.execute(
                  request,
                  new ReadJsonArray(
                      new MatchStatus(request.getURI(), HttpStatus.SC_OK)
                  )
              );
              this.resources = array.stream()
                  .map(json -> (JsonObject) json)
                  .map(
                      json -> mapper.apply(json)
                  ).collect(Collectors.toList())
                  .iterator();
          } catch (final IOException ex) {
              throw new IllegalStateException(
                  "IOException when calling " + request.getURI().toString(), ex
              );
          } finally {
              request.releaseConnection();
          }
      }
  
      @Override
      public boolean hasNext() {
          return this.resources.hasNext();
      }
  
      @Override
      public T next() {
          return this.resources.next();
      }
  }
  