Java tutorial
/** * 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.camel.component.twitter.producer; import java.util.List; import org.apache.camel.CamelExchangeException; import org.apache.camel.Exchange; import org.apache.camel.component.twitter.TwitterConstants; import org.apache.camel.component.twitter.TwitterEndpoint; import org.apache.camel.util.ObjectHelper; import twitter4j.Query; import twitter4j.QueryResult; import twitter4j.Status; import twitter4j.Twitter; public class SearchProducer extends Twitter4JProducer { private volatile long lastId; public SearchProducer(TwitterEndpoint te) { super(te); } @Override public void process(Exchange exchange) throws Exception { long myLastId = lastId; // KEYWORDS // keywords from header take precedence String keywords = exchange.getIn().getHeader(TwitterConstants.TWITTER_KEYWORDS, String.class); if (keywords == null) { keywords = te.getProperties().getKeywords(); } if (keywords == null) { throw new CamelExchangeException("No keywords to use for query", exchange); } Query query = new Query(keywords); // filter of older tweets if (te.getProperties().isFilterOld() && myLastId != 0) { query.setSinceId(myLastId); } // language String lang = exchange.getIn().getHeader(TwitterConstants.TWITTER_SEARCH_LANGUAGE, String.class); if (lang == null) { lang = te.getProperties().getLang(); } if (ObjectHelper.isNotEmpty(lang)) { query.setLang(lang); } // number of elemnt per page Integer count = exchange.getIn().getHeader(TwitterConstants.TWITTER_COUNT, Integer.class); if (count == null) { count = te.getProperties().getCount(); } if (ObjectHelper.isNotEmpty(count)) { query.setCount(count); } // number of pages Integer numberOfPages = exchange.getIn().getHeader(TwitterConstants.TWITTER_NUMBER_OF_PAGES, Integer.class); if (numberOfPages == null) { numberOfPages = te.getProperties().getNumberOfPages(); } Twitter twitter = te.getProperties().getTwitter(); log.debug("Searching twitter with keywords: {}", keywords); QueryResult results = twitter.search(query); List<Status> list = results.getTweets(); for (int i = 1; i < numberOfPages; i++) { if (!results.hasNext()) { break; } log.debug("Fetching page"); results = twitter.search(results.nextQuery()); list.addAll(results.getTweets()); } if (te.getProperties().isFilterOld()) { for (Status t : list) { long newId = t.getId(); if (newId > myLastId) { myLastId = newId; } } } exchange.getIn().setBody(list); // update the lastId after finished the processing if (myLastId > lastId) { lastId = myLastId; } } }