uk.ac.starlink.table
Class BlankColumn

java.lang.Object
  |
  +--uk.ac.starlink.table.ColumnData
        |
        +--uk.ac.starlink.table.BlankColumn

public class BlankColumn
extends ColumnData

Represents a column with metadata but no data. Every cell returns null, and is not writable.

Since:
28 Oct 2004

Constructor Summary
BlankColumn(ColumnInfo colinfo)
          Constructs a new column based on a given column metadata object.
 
Method Summary
 Object readValue(long irow)
          Returns column value, which is always null.
 
Methods inherited from class uk.ac.starlink.table.ColumnData
getColumnInfo, isWritable, setColumnInfo, storeValue
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

BlankColumn

public BlankColumn(ColumnInfo colinfo)
Constructs a new column based on a given column metadata object.

Parameters:
colinfo - metadata for column
Method Detail

readValue

public Object readValue(long irow)
Returns column value, which is always null.

Specified by:
readValue in class ColumnData
Parameters:
irow - row index
Returns:
null

Copyright © 2004 CLRC: Central Laboratory of the Research Councils. All rights reserved.