Fetching feeds to crawl

First, a method which fetches the set of feeds to crawl.

1. Add this method to Importer.java:

   static NSArray fetchFeedsToCrawl(EOEditingContext ec) {
       NSMutableArray qualifiers = new NSMutableArray();
       
       // fetch all feeds that haven't been fetched in the last hour
       qualifiers.addObject(new EOKeyValueQualifier(
          "lastFetchDate", 
           EOQualifier.QualifierOperatorLessThan, 
           new NSTimestamp().timestampByAddingGregorianUnits(0, 0, 0, -1, 0, 0)));
      
       // and all feeds which weren't invalid last time we fetched
       qualifiers.addObject(
           WHEnterpriseObject.qualifierForBooleanAttribute(ec, 
           "RSSFeed", "lastFetchInvalid", EOQualifier.QualifierOperatorEqual, false));
      
       EOQualifier q = new EOAndQualifier(qualifiers);
       EOFetchSpecification fs = new EOFetchSpecification("RSSFeed", q, null);
       return ec.objectsWithFetchSpecification(fs);
   }

   Note: The qualifierForBooleanAttribute method constructs a qualifier to match boolean values in a database independent fashion. It works by inspecting the current definition of the boolean attribute to determine whether to use a Boolean, String or Integer to represent true or false. Note that here we are using "lastFetchInvalid", which is what the attribute is called in the model. When setting or getting a boolean value on the feed, you'll use the setLastFetchWasInvalid and lastFetchWasInvalid methods defined earlier.

Copyright ©2000-2003 Gary Teter. All rights reserved. WireHose is a trademark of Gary Teter.