Tagging items

In addition to using whatever categories were specified for an item in its RSS feed, the Hello World crawler will also assign tags based on the feed's categories.

1. Add this method to Importer.java:

   static void tagItemsForFeed(EOEditingContext ec, NSArray items, RSSFeed feed) {
      
       // use this to get a tagpath without "Feeds/" at the beginning
       // for example, "Consumer/Gardening" instead of "Feeds/Consumer/Gardening"
       WHTag feedAncestor = WHTag.tagForPath(ec, "Feeds", false);
       NSMutableArray tags = new NSMutableArray();
       String path;
       WHTag tag;
      
       // iterate through the feed's tags
       // and build an array of tags to assign to items
       for (int i=0, count=feed.tags().count(); i<count; i++) {
           tag = (WHTag)feed.tags().objectAtIndex(i);
      
           // get a tagpath that starts with "Content/" instead of "Feeds/"
           // e.g., "Content/Consumer/Gardening"
           path = "Content/"+tag.tagPath(feedAncestor, "/");
      
           // add a tag for that path
           tags.addObject(WHTag.tagForPath(ec, path, true));
      
           // and add a tag for that path, plus the feed's name
           // e.g., "Consumer/Gardening/About.com Botany"
           tags.addObject(WHTag.tagForPath(ec, path+"/"+feed.name(), true));
       }
      
       RSSItem item;
      
       // iterate through items
       for (int i=0, count=items.count(); i<count; i++) {
           item = (RSSItem)items.objectAtIndex(i);
      
           // associate the item with the feed
           item.addObjectToBothSidesOfRelationshipWithKey(feed, "feed");
      
           // and add tags to the item
           WHTag.addTags(item, tags);
       }
   }
      

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