uk.ac.starlink.table
Class WrapperColumn

java.lang.Object
  extended by uk.ac.starlink.table.ColumnData
      extended by 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.


Constructor Summary
WrapperColumn(ColumnData base)
          Initialises a new WrapperColumn based on a base column.
 
Method Summary
 ColumnData getBaseColumn()
          Returns the column on which this one is based.
 boolean isWritable()
          Indicates whether this object can store values.
 java.lang.Object readValue(long irow)
          Returns the value stored at a given row in this column.
 void storeValue(long irow, java.lang.Object val)
          Stores a given value in a given row for this column.
 
Methods inherited from class uk.ac.starlink.table.ColumnData
getColumnInfo, setColumnInfo
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

WrapperColumn

public WrapperColumn(ColumnData base)
Initialises a new WrapperColumn based on a base column.

Parameters:
base - the base column
Method Detail

readValue

public java.lang.Object readValue(long irow)
                           throws java.io.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:
java.io.IOException - if there is some problem reading

storeValue

public void storeValue(long irow,
                       java.lang.Object val)
                throws java.io.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:
java.io.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