/// <summary>
/// Checks in a book. Makes appropriate changes to the database and local memory collections
/// </summary>
/// <param name="log">CheckOut log to be used for the check in operations</param>
/// <returns></returns>
public bool CheckIn(CheckOutLog log)
{
if (!IsLibrarian) //if not a librarian
{
return(false);
}
try
{
//remove log from context and save changes
context.CheckOutLogs.Remove(log);
context.SaveChanges();
}
catch (Exception ex)
{
while (ex != null)
{
ex = ex.InnerException;
}
DatabaseEventArgs e = new DatabaseEventArgs(ex.Message);
OnDatabaseErrorRaised(e);
return(false);
}
//remove log from memory collection
checkoutLogs.Remove(log);
return(true);
}
/// <summary>
/// Check Out Book, make changes to the database and local collections
/// </summary>
/// <param name="book">Book to be checked out</param>
/// <param name="cardHolder">MCardholder that is checking out the book</param>
/// <param name="error">an error string to be outputted should a check out error occur</param>
/// <returns></returns>
public bool CheckOut(Book book, MCardholder cardHolder, out string error)
{
if (!IsLibrarian) //if not a librarian
{
error = "You are not authorized to check out a book.";
return(false);
}
if (cardHolder.HasOverdueBooks)
{
error = "User has Overdue books, cannot check out additional books.";
return(false);
}
if (book.CopiesAvailable > 0) //Make sure that there is a copy available
{
//Create a checkout log
CheckOutLog log = new CheckOutLog
{
Book = book,
Book_BookId = book.BookId,
CheckOutDate = DateTime.Now,
Cardholder_PersonId = cardHolder.ID,
Cardholder = cardHolder.Cardholder
};
try
{
//Add log to context and save
context.CheckOutLogs.Add(log);
context.SaveChanges();
}
catch (Exception ex)
{
while (ex != null)
{
ex = ex.InnerException;
}
DatabaseEventArgs e = new DatabaseEventArgs(ex.Message);
OnDatabaseErrorRaised(e);
error = "Cannot check out book. Please try again later.";
return(false);
}
//add log to memory collection
checkoutLogs.Add(log);
error = "";
return(true);
}
error = string.Format("{0} could not be checked out, no copies available", book.Title);
return(false);
}
/// <summary>
/// Checks in the selected CheckOutLog
/// </summary>
private void LogCheckIn()
{
CheckOutLog log = CheckOutListView.SelectedItem as CheckOutLog;
if (log != null) //ensure the log is not null
{
if (controller.CheckIn(log)) //if check in is successful
{
SearchCheckOutLogs(); //repopulate the CheckOutListView with updated search query result
}
}
}
