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	getSchema() Returns the List of ElementSymbol describing the Tuple Source
java.util.List	nextTuple() Returns the next tuple

Method Detail

getSchema

java.util.List 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