public TextReader CreateReader(Book book)
{
TextReader textReader;
if (book.Path.EndsWith("pdf"))
textReader = PdfTextReader.Open(book.Path);
else if (book.Path.EndsWith("chm"))
textReader = new ChmTextReader(book.Path);
else
textReader = new StreamReader(File.OpenRead(book.Path));
return textReader;
}
public LibraryDiff Refresh(Book[] foundBooksThisTime)
{
List<Book> newBooks = new List<Book>();
List<Book> removedBooks = new List<Book>();
var existingPaths = foundBooksThisTime.Select(x => x.Path);
var orphanedBooks = new List<Book>();
var updatedBooks = new List<Book>();
foreach (var book in Books)
{
if (!existingPaths.Contains(book.Path, StringComparer.InvariantCultureIgnoreCase))
orphanedBooks.Add(book);
}
foreach (var orphanedBook in orphanedBooks)
{
Books.Remove(orphanedBook);
}
removedBooks.AddRange(orphanedBooks);
foreach (var foundBook in foundBooksThisTime)
{
var existingBook = Books.SingleOrDefault(x => x.Path == foundBook.Path);
if (existingBook != null)
{
// if size or timestamp changed
if (existingBook.Size != foundBook.Size ||
foundBook.Timestamp.Subtract(existingBook.Timestamp).Milliseconds > 0)
{
existingBook.UpdateFileInfo(foundBook);
updatedBooks.Add(existingBook);
}
}
else
{
Books.Add(foundBook);
newBooks.Add(foundBook);
}
}
return new LibraryDiff(newBooks, updatedBooks, removedBooks);
}
public void UpdateFileInfo(Book book)
{
this.size = book.Size;
this.timestamp = book.Timestamp;
}
