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

java.lang.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 java.lang.Object readValue(long irow)

Returns column value, which is always null.

Specified by:

readValue in class ColumnData

Parameters:

irow - row index

Returns:

null