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 Details

    • BlankColumn

      public BlankColumn(ColumnInfo colinfo)
      Constructs a new column based on a given column metadata object.
      Parameters:
      colinfo - metadata for column
  • Method Details

    • 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