Package uk.ac.starlink.table
Class BlankColumn
java.lang.Object
uk.ac.starlink.table.ColumnData
uk.ac.starlink.table.BlankColumn
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
ConstructorsConstructorDescriptionBlankColumn
(ColumnInfo colinfo) Constructs a new column based on a given column metadata object. -
Method Summary
Methods inherited from class uk.ac.starlink.table.ColumnData
getColumnInfo, isWritable, setColumnInfo, storeValue
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Constructor Details
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BlankColumn
Constructs a new column based on a given column metadata object.- Parameters:
colinfo
- metadata for column
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Method Details
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readValue
Returns column value, which is always null.- Specified by:
readValue
in classColumnData
- Parameters:
irow
- row index- Returns:
- null
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