package us.codecraft.webmagic.selector;
   
   import java.util.ArrayList;
   import java.util.List;
   
   /**
    * All extractors will do extracting separately, <br>
    * and the results of extractors will combined as the final result.
    * @author code4crafter@gmail.com <br>
   * @since 0.2.0
   */
  public class OrSelector implements Selector {
  
      private List<Selector> selectors = new ArrayList<Selector>();
  
      public OrSelector(Selector... selectors) {
          for (Selector selector : selectors) {
              this.selectors.add(selector);
          }
      }
  
      public OrSelector(List<Selector> selectors) {
          this.selectors = selectors;
      }
  
      @Override
      public String select(String text) {
          for (Selector selector : selectors) {
              String result = selector.select(text);
              if (result != null) {
                  return result;
              }
          }
          return null;
      }
  
      @Override
      public List<String> selectList(String text) {
          List<String> results = new ArrayList<String>();
          for (Selector selector : selectors) {
              List<String> strings = selector.selectList(text);
              results.addAll(strings);
          }
          return results;
      }
  }