uk.ac.starlink.table
Class EmptyRowSequence

java.lang.Object
  uk.ac.starlink.table.EmptyRowSequence

All Implemented Interfaces:

RowSequence

public class EmptyRowSequence
extends java.lang.Object
implements RowSequence

Row sequence implementation which has no rows. Singleton impelementation.

Since:

28 Oct 2004

Method Summary

void	close() Does nothing.
java.lang.Object	getCell(int icol) Always throws IllegalStateException.
static EmptyRowSequence	getInstance() Returns singleton instance of this class.
java.lang.Object[]	getRow() Always throws IllegalStateException.
boolean	next() Always returns false.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

next

public boolean next()

Always returns false.

Specified by:

next in interface RowSequence

Returns:

true iff this sequence has been advanced to the next row

getCell

public java.lang.Object getCell(int icol)

Always throws IllegalStateException.

Specified by:

getCell in interface RowSequence

Returns:

the contents of cell icol in the current row

getRow

public java.lang.Object[] getRow()

Always throws IllegalStateException.

Specified by:

getRow in interface RowSequence

Returns:

an array of the objects in each cell in row irow

close

public void close()

Does nothing.

Specified by:

close in interface RowSequence

getInstance

public static EmptyRowSequence getInstance()

Returns singleton instance of this class.

Returns:

instance