Constructor and Description |
---|
LimitRowSink(TableSink base,
long maxrow)
Constructor.
|
Modifier and Type | Method and Description |
---|---|
void |
acceptMetadata(StarTable table)
Takes delivery of a row-less
StarTable object which defines
the metadata of the table to be transmitted. |
void |
acceptRow(Object[] row)
Takes delivery of one row of data.
|
void |
endRows()
Signals that there are no more rows to be transmitted.
|
boolean |
isTruncated()
Indicates whether this sink has received any rows that it has
refused to pass on to its base sink.
|
public LimitRowSink(TableSink base, long maxrow)
base
- base sinkmaxrow
- maximum number of rows this sink will transmit
to its basepublic void acceptMetadata(StarTable table) throws TableFormatException
TableSink
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.
acceptMetadata
in interface TableSink
table
- table metadata objectTableFormatException
- if this sink cannot accept table rows
matching the given metadatapublic void acceptRow(Object[] row) throws IOException
TableSink
row
is an array of
objects comprising the contents of one row of the table being
transmitted. The number and classes of the elements of row
are described by the metadata object previously accepted.acceptRow
in interface TableSink
row
- table data rowIOException
public void endRows() throws IOException
TableSink
endRows
in interface TableSink
IOException
public boolean isTruncated()
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