Package uk.ac.starlink.table.storage
Class ListRowStore
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
.- Since:
- 3 Aug 2004
- Author:
- Mark Taylor (Starlink)
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoid
acceptMetadata
(StarTable meta) Takes delivery of a row-lessStarTable
object which defines the metadata of the table to be transmitted.void
Accepts a row.void
endRows()
Signals that there are no more rows to be transmitted.Obtains a StarTable which contains the data and metadata that have been written into this sink.
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Constructor Details
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ListRowStore
public ListRowStore()
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Method Details
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acceptMetadata
Description copied from interface:TableSink
Takes delivery of a row-lessStarTable
object which defines the metadata of the table to be transmitted. If the number of rows that will be transmitted via subsequent calls toacceptRow
is known, this value should be made available as the row count ofmeta
(StarTable.getRowCount()
); if it is not known, the row count should be -1. However, this object should not attempt to read any ofmeta
'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 tometa
then it may throw a TableFormatException - this may be the case if for instancemeta
has columns with types that this sink can't deal with.- Specified by:
acceptMetadata
in interfaceTableSink
- Parameters:
meta
- table metadata object
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acceptRow
Accepts a row.- Specified by:
acceptRow
in interfaceTableSink
- Parameters:
row
- table data row- Throws:
OutOfMemoryError
- if it's run out of memoryIOException
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endRows
public void endRows()Description copied from interface:TableSink
Signals that there are no more rows to be transmitted. -
getStarTable
Description copied from interface:RowStore
Obtains a StarTable which contains the data and metadata that have been written into this sink. In general it is only legal to call this method following a call toTableSink.endRows()
; failing to observe this sequence may earn you anIllegalStateException
- Specified by:
getStarTable
in interfaceRowStore
- Returns:
- a random-access StarTable containing the written rows
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