private LinkedList <Book> GenerateShelf(DbBuffer buffer)
{
var books = new LinkedList <Book>();
var totalWidth = 0.0f;
while (true)
{
// find entry with good size if it exsists
DataEntry entry;
do
{
if ((entry = buffer.NextEntry()) == null)
{
Debug.Log("Database buffer return null");
return(books); // db ran out
}
} while (entry.Width > shelfWidth * 100);
var book = new Book(entry);
if (book.Width < MinWidth)
{
continue;
}
totalWidth += book.Width;
if (totalWidth >= shelfWidth)
{
break;
}
addShelf(books, book);
}
return(books);
}
/// <summary>
/// Given initial conditions, query the database until this object is filled with
/// <see cref="Book"/> objects. Any chained <see cref="Bookshelf"/> objects will also have this
/// function called.
/// </summary>
/// <param name="direction">direction to load</param>
/// <exception cref="ArgumentOutOfRangeException">if direction is invalid</exception>
public void Load(Direction direction)
{
if (!done)
{
return;
}
done = false;
// Load self
// FIXME The Identity direction does not include the starting book when populating
DbBuffer buffer;
switch (direction)
{
case Direction.Right:
addShelf = AddRight;
addTable = AddRight;
buffer = new DbBuffer(End, direction);
break;
case Direction.Left:
addShelf = AddLeft;
addTable = AddLeft;
buffer = new DbBuffer(Start, direction);
break;
case Direction.Identity:
addShelf = AddRight;
addTable = AddRight;
buffer = new DbBuffer(Start, Direction.Right);
break;
default:
throw new ArgumentOutOfRangeException("direction", direction, message: null);
}
PopulateTable(buffer);
done = true;
// Load chain
foreach (var entry in chain)
{
entry.bookshelf.Start = Start;
entry.bookshelf.End = End;
entry.bookshelf.Load(entry.direction);
}
}
private void PopulateTable(DbBuffer buffer)
{
for (var i = 0; i < shelfCount; i++)
{
var books = GenerateShelf(buffer);
if (books.Count == 0)
{
break;
}
addTable(Table, books);
}
if (Table.Count > 0)
{
Start = Table.First.Value.First.Value.CallNumber;
End = Table.Last.Value.Last.Value.CallNumber;
}
else
{
Start = End = "";
}
}