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 java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
BlankColumn
public BlankColumn(ColumnInfo colinfo)
- Constructs a new column based on a given column metadata object.
- Parameters:
colinfo
- metadata for column
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