uk.ac.starlink.table

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 Summary

Constructors

Constructor and Description
WrapperColumn(ColumnData base) Initialises a new WrapperColumn based on a base column.

Method Summary

Modifier and Type	Method and Description
ColumnData	getBaseColumn() Returns the column on which this one is based.
boolean	isWritable() Indicates whether this object can store values.
Object	readValue(long irow) Returns the value stored at a given row in this column.
void	storeValue(long irow, 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 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