Class EditableColumn

java.lang.Object
uk.ac.starlink.table.ColumnData
uk.ac.starlink.table.WrapperColumn
uk.ac.starlink.table.EditableColumn
public class EditableColumn extends WrapperColumn
A column which can be initialised from a given existing column, but whose cells can be written to. Whether the initialisation is done by copying the whole lot and creating a new column or by just keeping track of the changed elements is unspecified and down to the implementation. Modifications to the cell data or the metadata of this column will not affect the data/metadata of the base column.
Author:
Mark Taylor (Starlink)

  • Constructor Details

    • EditableColumn

      public EditableColumn(ColumnData base)
      Constructs a new EditableColumn based on an existing column.

  • Method Details

    • isWritable

      public boolean isWritable()
      Returns true.
      Overrides:
      isWritable in class WrapperColumn
      Returns:
      whether cells can be edited. They can.

    • readValue

      public Object readValue(long irow) throws IOException
      Description copied from class: ColumnData
      Returns the value stored at a given row in this column.
      Overrides:
      readValue in class WrapperColumn
      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 value) 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 WrapperColumn
      Parameters:
      irow - the row to store it in
      value - the object to store
      Throws:
      IOException - if there is some problem writing

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