Class WrapperColumn

java.lang.Object
uk.ac.starlink.table.ColumnData
uk.ac.starlink.table.WrapperColumn
Direct Known Subclasses:
EditableColumn

public class WrapperColumn extends ColumnData
ColumnData which wraps another ColumnData. The behaviour of this ColumnData is identical to that of the base one. It is intended for subclasses which may modify the behaviour in some way.
Author:
Mark Taylor (Starlink)
  • Constructor Details

    • WrapperColumn

      public WrapperColumn(ColumnData base)
      Initialises a new WrapperColumn based on a base column.
      Parameters:
      base - the base column
  • Method Details

    • readValue

      public Object readValue(long irow) throws IOException
      Description copied from class: ColumnData
      Returns the value stored at a given row in this column.
      Specified by:
      readValue in class ColumnData
      Parameters:
      irow - the row from which to retrieve the value
      Returns:
      the value stored at irow
      Throws:
      IOException - if there is some problem reading
    • storeValue

      public void storeValue(long irow, Object val) throws IOException
      Description copied from class: ColumnData
      Stores a given value in a given row for this column. Will only work if the isWritable method returns true. The implementation in the ColumnData class throws an UnsupportedOperationException.
      Overrides:
      storeValue in class ColumnData
      Parameters:
      irow - the row to store it in
      val - the object to store
      Throws:
      IOException - if there is some problem writing
    • isWritable

      public boolean isWritable()
      Description copied from class: ColumnData
      Indicates whether this object can store values. The implementation in the ColumnData class returns false
      Overrides:
      isWritable in class ColumnData
      Returns:
      true iff ColumnData.storeValue(long, java.lang.Object) can be used
    • getBaseColumn

      public ColumnData getBaseColumn()
      Returns the column on which this one is based.
      Returns:
      wrapped column