Package uk.ac.starlink.table.storage
Class ListRowStore
- java.lang.Object
-
- uk.ac.starlink.table.storage.ListRowStore
-
public class ListRowStore extends java.lang.Object implements RowStore
Implementation of RowStore which stores data in memory. The current implementation uses aRowListStarTable
. 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)
-
-
Constructor Summary
Constructors Constructor Description ListRowStore()
-
Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
acceptMetadata(StarTable meta)
Takes delivery of a row-less StarTable object which defines the metadata of the table to be transmitted.void
acceptRow(java.lang.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.
-
-
-
Method Detail
-
acceptMetadata
public void acceptMetadata(StarTable meta)
Description copied from interface:TableSink
Takes delivery of a row-less StarTable object which defines the metadata of the table to be transmitted. If the number of rows that will be transmitted via subsequent calls to acceptRow is known, this value should be made available as the row count of meta (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.
- Specified by:
acceptMetadata
in interfaceTableSink
- Parameters:
meta
- table metadata object
-
acceptRow
public void acceptRow(java.lang.Object[] row) throws java.io.IOException
Accepts a row.
-
endRows
public void endRows()
Description copied from interface:TableSink
Signals that there are no more rows to be transmitted.
-
getStarTable
public StarTable 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 an IllegalStateException- Specified by:
getStarTable
in interfaceRowStore
- Returns:
- a random-access StarTable containing the written rows
-
-