Package uk.ac.starlink.table
Class WrapperColumn
- java.lang.Object
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- uk.ac.starlink.table.ColumnData
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- uk.ac.starlink.table.WrapperColumn
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- 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)
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Constructor Summary
Constructors Constructor Description WrapperColumn(ColumnData base)
Initialises a new WrapperColumn based on a base column.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description 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
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Constructor Detail
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WrapperColumn
public WrapperColumn(ColumnData base)
Initialises a new WrapperColumn based on a base column.- Parameters:
base
- the base column
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Method Detail
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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 classColumnData
- 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
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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 classColumnData
- Parameters:
irow
- the row to store it inval
- the object to store- Throws:
java.io.IOException
- if there is some problem writing
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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 classColumnData
- Returns:
- true iff
ColumnData.storeValue(long, java.lang.Object)
can be used
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getBaseColumn
public ColumnData getBaseColumn()
Returns the column on which this one is based.- Returns:
- wrapped column
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