| /* |
| * 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. |
| */ |
| package org.apache.zest.library.rest.client; |
| |
| import java.util.ArrayList; |
| import java.util.Iterator; |
| import java.util.List; |
| import javax.xml.parsers.DocumentBuilderFactory; |
| import javax.xml.xpath.XPath; |
| import javax.xml.xpath.XPathConstants; |
| import javax.xml.xpath.XPathExpressionException; |
| import javax.xml.xpath.XPathFactory; |
| import org.junit.BeforeClass; |
| import org.junit.Test; |
| import org.apache.zest.bootstrap.AssemblyException; |
| import org.apache.zest.bootstrap.ModuleAssembly; |
| import org.apache.zest.library.rest.client.api.ContextResourceClient; |
| import org.apache.zest.library.rest.client.api.ContextResourceClientFactory; |
| import org.apache.zest.library.rest.client.api.ErrorHandler; |
| import org.apache.zest.library.rest.client.api.HandlerCommand; |
| import org.apache.zest.library.rest.client.spi.ResponseHandler; |
| import org.apache.zest.library.rest.client.spi.ResponseReader; |
| import org.apache.zest.library.rest.client.spi.ResultHandler; |
| import org.apache.zest.library.rest.common.ValueAssembler; |
| import org.apache.zest.test.AbstractQi4jTest; |
| import org.apache.zest.valueserialization.orgjson.OrgJsonValueSerializationAssembler; |
| import org.restlet.Client; |
| import org.restlet.Response; |
| import org.restlet.data.Protocol; |
| import org.restlet.data.Reference; |
| import org.restlet.resource.ResourceException; |
| import org.w3c.dom.Document; |
| import org.w3c.dom.Node; |
| import org.w3c.dom.NodeList; |
| |
| import static org.apache.zest.library.rest.client.api.HandlerCommand.refresh; |
| import static org.apache.zest.test.util.Assume.assumeConnectivity; |
| |
| /** |
| * Reads Qi4j Github commits on develop ATOM feed and prints out all title and detail url for each entry. |
| * This is an example of how to use the RSS client for something more generic that was not produced by Zest REST server |
| * library. |
| */ |
| public class RssReaderTest |
| extends AbstractQi4jTest |
| { |
| |
| @BeforeClass |
| public static void beforeRssReaderTest() |
| { |
| assumeConnectivity( "github.com", 443 ); |
| } |
| |
| private ContextResourceClient crc; |
| |
| @Override |
| public void assemble( ModuleAssembly module ) |
| throws AssemblyException |
| { |
| // General setup of client |
| new OrgJsonValueSerializationAssembler().assemble( module ); |
| new ClientAssembler().assemble( module ); |
| new ValueAssembler().assemble( module ); |
| } |
| |
| @Test |
| public void testReadRssFeed() |
| { |
| Client client = new Client( Protocol.HTTPS ); |
| Reference ref = new Reference( "https://github.com/Qi4j/qi4j-sdk/commits/develop.atom" ); |
| ContextResourceClientFactory contextResourceClientFactory = module.newObject( ContextResourceClientFactory.class, client ); |
| |
| contextResourceClientFactory.registerResponseReader( new ResponseReader() |
| { |
| @Override |
| public Object readResponse( Response response, Class<?> resultType ) |
| throws ResourceException |
| { |
| if( resultType.equals( Document.class ) ) |
| { |
| try |
| { |
| DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance(); |
| documentBuilderFactory.setNamespaceAware( false ); |
| return documentBuilderFactory.newDocumentBuilder().parse( response.getEntity().getStream() ); |
| } |
| catch( Exception e ) |
| { |
| throw new ResourceException( e ); |
| } |
| } |
| |
| return null; |
| } |
| } ); |
| |
| contextResourceClientFactory.setErrorHandler( new ErrorHandler().onError( ErrorHandler.RECOVERABLE_ERROR, new ResponseHandler() |
| { |
| @Override |
| public HandlerCommand handleResponse( Response response, ContextResourceClient client ) |
| { |
| System.out.println( ">> REFRESH on recoverable error: " + response.getStatus() ); |
| return refresh(); |
| } |
| } ) ); |
| |
| crc = contextResourceClientFactory.newClient( ref ); |
| |
| crc.onResource( new ResultHandler<Document>() |
| { |
| Iterator<Node> itemNodes; |
| |
| @Override |
| public HandlerCommand handleResult( Document result, ContextResourceClient client ) |
| { |
| try |
| { |
| final XPath xPath = XPathFactory.newInstance().newXPath(); |
| |
| System.out.println( "== " + xPath.evaluate( "feed/title", result ) + " ==" ); |
| |
| final NodeList nodes = (NodeList) xPath.evaluate( "feed/entry", result, XPathConstants.NODESET ); |
| List<Node> items = new ArrayList<>(); |
| for( int i = 0; i < nodes.getLength(); i++ ) |
| { |
| items.add( nodes.item( i ) ); |
| } |
| |
| itemNodes = items.iterator(); |
| |
| return processEntry( xPath ); |
| } |
| catch( XPathExpressionException e ) |
| { |
| throw new ResourceException( e ); |
| } |
| } |
| |
| private HandlerCommand processEntry( final XPath xPath ) |
| throws XPathExpressionException |
| { |
| if( !itemNodes.hasNext() ) |
| { |
| return null; |
| } |
| |
| Node item = itemNodes.next(); |
| |
| String title = xPath.evaluate( "title", item ); |
| String detailUrl = xPath.evaluate( "link/@href", item ); |
| |
| System.out.println( "-- " + title + " --" ); |
| System.out.println( "-- " + detailUrl + " --" ); |
| |
| return processEntry( xPath ); |
| } |
| } ); |
| |
| crc.start(); |
| } |
| } |