com.metamatrix.common.buffer
Interface TupleSource

All Known Subinterfaces:

IndexedTupleSource

All Known Implementing Classes:

NullTupleSource, UpdateCountTupleSource

public interface TupleSource

A cursored source of tuples. The implementation will likely be closely bound to a BufferManager implementation - it will work with it to use TupleBatches behind the scenes.

Method Summary

void	closeSource() Closes the Tuple Source.
java.util.List<SingleElementSymbol>	getSchema() Returns the List of ElementSymbol describing the Tuple Source
java.util.List<?>	nextTuple() Returns the next tuple

Method Detail

getSchema

java.util.List<SingleElementSymbol> getSchema()

Returns the List of ElementSymbol describing the Tuple Source

Returns:

the List of elements describing the Tuple Source

nextTuple

java.util.List<?> nextTuple()
                            throws MetaMatrixComponentException,
                                   MetaMatrixProcessingException

Returns the next tuple

Returns:

the next tuple (a List object), or null if there are no more tuples.

Throws:

MetaMatrixComponentException - indicating a non-business exception such as a communication exception, or other such nondeterministic exception

MetaMatrixProcessingException

closeSource

void closeSource()
                 throws MetaMatrixComponentException

Closes the Tuple Source.

Throws:

MetaMatrixComponentException - indicating a non-business exception such as a communication exception, or other such nondeterministic exception