Package uk.ac.starlink.table
Class BlankColumn
- java.lang.Object
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- uk.ac.starlink.table.ColumnData
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- uk.ac.starlink.table.BlankColumn
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public class BlankColumn extends ColumnData
Represents a column with metadata but no data. Every cell returns null, and is not writable.- Since:
- 28 Oct 2004
- Author:
- Mark Taylor (Starlink)
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Constructor Summary
Constructors Constructor Description BlankColumn(ColumnInfo colinfo)
Constructs a new column based on a given column metadata object.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Object
readValue(long irow)
Returns column value, which is always null.-
Methods inherited from class uk.ac.starlink.table.ColumnData
getColumnInfo, isWritable, setColumnInfo, storeValue
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Constructor Detail
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BlankColumn
public BlankColumn(ColumnInfo colinfo)
Constructs a new column based on a given column metadata object.- Parameters:
colinfo
- metadata for column
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Method Detail
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readValue
public java.lang.Object readValue(long irow)
Returns column value, which is always null.- Specified by:
readValue
in classColumnData
- Parameters:
irow
- row index- Returns:
- null
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