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

Author:

Mark Taylor (Starlink)

Constructor Summary

Constructors

Constructor and Description
BlankColumn(ColumnInfo colinfo) Constructs a new column based on a given column metadata object.

Method Summary

Modifier and Type	Method and Description
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