// Enumerates over all items in the Project Gutenberg catalog. If you need the creation
// date you must get it by calling the GetCreated method before this one. The returned
// items can be either meta-data for books or files (book volumes). Books come first.
public IEnumerable<object> GetItems(XmlReader reader)
{
Log.Verbose("Getting items...");
while (reader.ReadToFollowingElement())
switch (reader.LocalName) {
case "etext":
// The number is parsed within the ParseBook method. This copy is for logging
// purposes only.
var number = int.Parse(reader.GetAttribute("ID", RDF).Substring(5),
CultureInfo.InvariantCulture);
Book book;
using (var subreader = reader.ReadSubtree())
try {
book = ParseBook(subreader);
} catch (Exception exception) {
throw new ApplicationException(string.Format(
"Parsing book {0} failed.", number), exception);
}
yield return book;
break;
case "file":
// The URL is parsed within the ParseVolume method. This copy is for logging
// purposes only.
var url = ParseVolumeUrl(reader);
Volume volume;
using (var subreader = reader.ReadSubtree())
try {
volume = ParseVolume(subreader);
} catch (Exception exception) {
throw new ApplicationException(string.Format(
"Parsing volume {0} failed.", url), exception);
}
yield return volume;
break;
}
}
