/**
* Returns the DbFile that can be used to read the contents of the specified table.
*
* @param tableid The id of the table, as specified by the DbFile.getId() function passed to
* addTable
*/
public DbFile getDbFile(int tableid) throws NoSuchElementException {
// some code goes here
String fileName = fileId.get(tableid);
if (fileName.equals(null)) throw new NoSuchElementException();
DbFile retFile = tableFile.get(fileName);
if (retFile.equals(null)) throw new NoSuchElementException();
else return retFile;
}
/**
* Returns the tuple descriptor (schema) of the specified table
*
* @param tableid The id of the table, as specified by the DbFile.getId() function passed to
* addTable
* @throws NoSuchElementException if the table doesn't exist
*/
public TupleDesc getTupleDesc(int tableid) throws NoSuchElementException {
// some code goes here
String fileName = fileId.get(tableid);
if (fileName.equals(null)) throw new NoSuchElementException();
DbFile retTD = tableFile.get(fileName);
if (retTD.equals(null)) throw new NoSuchElementException();
// System.out.println(retTD);
else return retTD.getTupleDesc();
}