Package uk.ac.starlink.table.storage
Class ByteStoreRowStore
java.lang.Object
uk.ac.starlink.table.storage.ByteStoreRowStore
- Direct Known Subclasses:
DiskRowStore
RowStore based on a ByteStore.
It uses custom serialization to encode some basic data types
(primitives, Strings, and arrays of them) as a byte sequence.
Therefore it may not cope with tables containing exotic objects.
The actual storage destination is controlled by the
ByteStore
implementation used.- Since:
- 5 Nov 2009
- Author:
- Mark Taylor
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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
Takes delivery of one row of data.void
endRows()
Signals that there are no more rows to be transmitted.Returns the underlying storage for this row store.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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ByteStoreRowStore
Constructor.- Parameters:
byteStore
- storage container used by this row store
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Method Details
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getByteStore
Returns the underlying storage for this row store.- Returns:
- buffer holding byte data
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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- Throws:
TableFormatException
- if this sink cannot accept table rows matching the given metadata
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acceptRow
Description copied from interface:TableSink
Takes delivery of one row of data.row
is an array of objects comprising the contents of one row of the table being transmitted. The number and classes of the elements ofrow
are described by the metadata object previously accepted.- Specified by:
acceptRow
in interfaceTableSink
- Parameters:
row
- table data row- Throws:
IOException
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endRows
Description copied from interface:TableSink
Signals that there are no more rows to be transmitted.- Specified by:
endRows
in interfaceTableSink
- Throws:
IOException
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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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