content: /*
   * 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.search;
  
  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.support.DefaultProducer;
  import org.apache.camel.util.ObjectHelper;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import twitter4j.Twitter;
  import twitter4j.v1.Query;
  import twitter4j.v1.QueryResult;
  import twitter4j.v1.Status;
  
  public class SearchProducer extends DefaultProducer {
  
      private static final Logger LOG = LoggerFactory.getLogger(SearchProducer.class);
  
      private volatile long lastId;
      private TwitterEndpoint endpoint;
      private String keywords;
  
      public SearchProducer(TwitterEndpoint endpoint, String keywords) {
          super(endpoint);
          this.endpoint = endpoint;
          this.keywords = keywords;
      }
  
      @Override
      public void process(Exchange exchange) throws Exception {
          long myLastId = lastId;
          // KEYWORDS
          // keywords from header take precedence
          String queryKeywords = exchange.getIn().getHeader(TwitterConstants.TWITTER_KEYWORDS, String.class);
          if (queryKeywords == null) {
              queryKeywords = this.keywords;
          }
  
          if (queryKeywords == null) {
              throw new CamelExchangeException("No keywords to use for query", exchange);
          }
  
          Query query = Query.of(queryKeywords);
  
          // filter of older tweets
          if (endpoint.getProperties().isFilterOld() && myLastId != 0) {
              query.sinceId(myLastId);
          }
  
          // since id
          Long sinceId = exchange.getIn().getHeader(TwitterConstants.TWITTER_SINCEID, Long.class);
          if (sinceId == null) {
              sinceId = endpoint.getProperties().getSinceId();
          }
          if (ObjectHelper.isNotEmpty(sinceId)) {
              query.sinceId(sinceId);
          }
  
          // max id
          Long maxId = exchange.getIn().getHeader(TwitterConstants.TWITTER_MAXID, Long.class);
          if (ObjectHelper.isNotEmpty(maxId)) {
              query.maxId(maxId);
          }
  
          // language
          String lang = exchange.getIn().getHeader(TwitterConstants.TWITTER_SEARCH_LANGUAGE, String.class);
          if (lang == null) {
              lang = endpoint.getProperties().getLang();
          }
  
          if (ObjectHelper.isNotEmpty(lang)) {
              query.lang(lang);
          }
  
          // number of elements per page
          Integer count = exchange.getIn().getHeader(TwitterConstants.TWITTER_COUNT, Integer.class);
          if (count == null) {
              count = endpoint.getProperties().getCount();
          }
          if (ObjectHelper.isNotEmpty(count)) {
              query.count(count);
          }
  
          // number of pages
          Integer numberOfPages = exchange.getIn().getHeader(TwitterConstants.TWITTER_NUMBER_OF_PAGES, Integer.class);
          if (numberOfPages == null) {
              numberOfPages = endpoint.getProperties().getNumberOfPages();
          }
  
          Twitter twitter = endpoint.getProperties().getTwitter();
          LOG.debug("Searching twitter with keywords: {}", queryKeywords);
          QueryResult results = twitter.v1().search().search(query);
          List<Status> list = results.getTweets();
  
          for (int i = 1; i < numberOfPages; i++) {
              if (!results.hasNext()) {
                  break;
              }
              LOG.debug("Fetching page");
              results = twitter.v1().search().search(results.nextQuery());
              list.addAll(results.getTweets());
          }
  
          if (endpoint.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;
          }
      }
  
  }
  