/** * 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 ([email protected]) * @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(); } }