// Parses a single book.
Book ParseBook(XmlReader reader)
{
var book = new Book();
while (reader.Read())
if (reader.NodeType == XmlNodeType.Element) {
string parseType;
switch (reader.LocalName) {
case "etext":
book.Number = int.Parse(reader.GetAttribute("ID", RDF).Substring(5),
CultureInfo.InvariantCulture);
break;
case "title":
parseType = reader.GetAttribute("parseType", RDF);
if (parseType != "Literal")
throw new ApplicationException("Unrecognized parse type.");
book.Title = reader.ReadElementContentAsString();
break;
case "description":
book.Notes = ParseText(reader);
break;
case "creator":
book.Authors = ParsePersonsAndEra(book, reader);
break;
case "contributor":
// Eras of contributors do not affect the era of the book intentionally.
// Contributors might be not only illustrators, who would live at the
// same time as authors, but also people who retyped the book and
// uploaded it to the Project Gutenberg web site. They would mess the
// era of the book which is supposed to embrace the time when the actual
// paper book was written.
book.Contributors = ParsePersons(reader);
break;
case "language":
if (!reader.ReadToDescendant("value", RDF))
throw new ApplicationException("Missing language value.");
book.Language = reader.ReadElementContentAsString();
break;
case "subject":
using (var subreader = reader.ReadSubtree())
book.Tags = ParseTags(subreader).ToArray();
break;
case "created":
if (!reader.ReadToDescendant("value", RDF))
throw new ApplicationException("Missing creation date value.");
book.Included = reader.ReadElementContentAsDate();
break;
case "downloads":
if (!reader.ReadToDescendant("value", RDF))
throw new ApplicationException("Missing download count value.");
book.Downloads = reader.ReadElementContentAsInt();
break;
}
}
return book;
}
// Gets the creation date of the Project Gutenberg catalog. This method should be called
// before parsing the books and volumes because the creation date is at the beginning;
// calling it later would not find the XML element with the date any more and would
// continue reading the content to the end, skipping all content. This method expects a
// reader returned by the method Open.
public Date GetCreated(XmlReader reader)
{
Log.Verbose("Getting creation date...");
if (!reader.ReadToFollowing("Description", RDF))
throw new ApplicationException("Missing creation time.");
if (!reader.ReadToDescendant("value", RDF))
throw new ApplicationException("Missing creation date value.");
return reader.ReadElementContentAsDate();
}
// Parses a single book volume.
Volume ParseVolume(XmlReader reader)
{
var volume = new Volume();
var formats = new List<string>();
while (reader.Read())
if (reader.NodeType == XmlNodeType.Element)
switch (reader.LocalName) {
case "file":
volume.URL = ParseVolumeUrl(reader);
break;
case "format":
if (!reader.ReadToDescendant("value", RDF))
throw new ApplicationException("Missing format value.");
formats.Add(reader.ReadElementContentAsString());
break;
case "extent":
volume.Size = reader.ReadElementContentAsInt();
break;
case "modified":
if (!reader.ReadToDescendant("value", RDF))
throw new ApplicationException("Missing modified date value.");
volume.Uploaded = reader.ReadElementContentAsDate();
break;
case "isFormatOf":
volume.Number = int.Parse(reader.GetAttribute("resource", RDF).
Substring(6), CultureInfo.InvariantCulture);
break;
}
volume.Formats = formats.Count > 0 ? formats.ToArray() : null;
return volume;
}