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java.lang.Object | +--uk.ac.starlink.table.storage.ListRowStore
Implementation of RowStore which stores data in memory.
The current implementation uses a
RowListStarTable
.
This is better-behaved than the RowStore contract requires; it
is guaranteed to be able to store any StarTable object
(acceptMetadata(uk.ac.starlink.table.StarTable)
will not throw a TableFormatException).
Cautious users of this class will note the fact that for large tables,
acceptRow(java.lang.Object[])
may throw an OutOfMemoryError.
Constructor Summary | |
ListRowStore()
|
Method Summary | |
void |
acceptMetadata(StarTable meta)
Takes delivery of a row-less StarTable object which defines the metadata of the table to be transmitted. |
void |
acceptRow(Object[] row)
Accepts a row. |
void |
endRows()
Signals that there are no more rows to be transmitted. |
StarTable |
getStarTable()
Obtains a StarTable which contains the data and metadata that have been written into this sink. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public ListRowStore()
Method Detail |
public void acceptMetadata(StarTable meta)
TableSink
StarTable.getRowCount()
); if it is not known, the row count
should be -1. However, this object should not attempt to read
any of meta's cell data.
The data to be transmitted in subsequent calls of acceptRow must match the metadata transmitted in this call in the same way that rows of a StarTable must match its own metadata (number and content clases of columns etc). If this sink cannot dispose of a table corresponding to meta then it may throw a TableFormatException - this may be the case if for instance meta has columns with types that this sink can't deal with.
acceptMetadata
in interface TableSink
meta
- table metadata objectpublic void acceptRow(Object[] row) throws IOException
acceptRow
in interface TableSink
row
- table data row
OutOfMemoryError
- if it's run out of memory
IOException
public void endRows()
TableSink
endRows
in interface TableSink
public StarTable getStarTable()
RowStore
TableSink.endRows()
; failing to observe this sequence may
earn you an IllegalStateException
getStarTable
in interface RowStore
|
Copyright © 2004 CLRC: Central Laboratory of the Research Councils. All rights reserved. | |||||||||
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