net.sf.farrago.runtime
Class FennelOnlyTupleReader

java.lang.Object
  net.sf.farrago.runtime.FennelOnlyTupleReader

All Implemented Interfaces:

FennelTupleReader

public class FennelOnlyTupleReader
extends Object
implements FennelTupleReader

FennelOnlyTupleReader implements the FennelTupleReader interface for reading tuples from a query plan that can be executed exclusively in Fennel.

Version:

$Id: //open/dev/farrago/src/net/sf/farrago/runtime/FennelOnlyTupleReader.java#5 $

Author:

Zelaine Fong

Field Summary

private FennelTupleAccessor	tupleAccessor
private FennelTupleData	tupleData

Constructor Summary

FennelOnlyTupleReader(FennelTupleDescriptor tupleDesc, FennelTupleData tupleData)

Method Summary

Object

unmarshalTuple(ByteBuffer byteBuffer, byte[] byteArray, ByteBuffer sliceBuffer) Unmarshals one tuple.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

tupleAccessor

private final FennelTupleAccessor tupleAccessor

tupleData

private final FennelTupleData tupleData

Constructor Detail

FennelOnlyTupleReader

public FennelOnlyTupleReader(FennelTupleDescriptor tupleDesc,
                             FennelTupleData tupleData)

Parameters:

tupleDesc - tuple descriptor of the tuples to be read

tupleData - tuple data that the tuples read will be unmarshalled into

Method Detail

unmarshalTuple

public Object unmarshalTuple(ByteBuffer byteBuffer,
                             byte[] byteArray,
                             ByteBuffer sliceBuffer)

Description copied from interface: FennelTupleReader

Unmarshals one tuple.

Specified by:

unmarshalTuple in interface FennelTupleReader

Parameters:

byteBuffer - read-only buffer containing marshalled tuple data; on entry, the buffer position is at beginning of tuple

byteArray - byte array underlying byteBuffer

sliceBuffer - result of byteBuffer.slice(), for use in relative offsets; on return, sliceBuffer position should be at the unaligned end of tuple

Returns:

subclass-specific object containing unmarshalled tuple data