org.objectweb.medor.tuple.lib
Class GeneralTupleLoader
java.lang.Object
org.objectweb.medor.tuple.lib.GeneralTupleLoader
- TupleLoader
public class GeneralTupleLoader
extends java.lang.Object
MEDOR: Middleware Enabling Distributed Object Requests
Copyright (C) 2001-2003 France Telecom R&D
Contact: alexandre.lefebvre@rd.francetelecom.com
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Initial developers: M. Alia, A. Lefebvre
int[] | getFieldIndexes() - An integer with position i in this array gives the position of the
corresponding field (field number i of the TupleStructure of this
QueryNode) in the array made of the concatenation of the array of fields
from all children of this QueryNode.
|
TupleStructure | getTupleStructure()
|
void | loadTuple(Tuple sourceBuffer, VariableOperand[] temp, ParameterOperand[] parameters) - Loads a source Tuple into an array of Operands.
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void | setFieldIndexes(int[] indexes)
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GeneralTupleLoader
public GeneralTupleLoader(int[] ranges,
TupleStructure ts)
getFieldIndexes
public int[] getFieldIndexes()
An integer with position i in this array gives the position of the
corresponding field (field number i of the TupleStructure of this
QueryNode) in the array made of the concatenation of the array of fields
from all children of this QueryNode.
- getFieldIndexes in interface TupleLoader
loadTuple
public void loadTuple(Tuple sourceBuffer,
VariableOperand[] temp,
ParameterOperand[] parameters)
throws MedorException,
ExpressionException
Loads a source Tuple into an array of Operands.
The Tuple represents the concatenation of the Tuples from the children
nodes of the associated QueryNode.
LoadTuple is used after the filter has been sucessfully evaluated to
load the current tuple (Tuple) into the memory tuple of this node,
represented as an array of Operands.
Not all attributes of the source Tuple are loaded into the array of
Operand. The choice of which attributes to load is done either
by using the array of indexes, which can be set through the setIndexes
method, or because the instance of TupleLoader has been compiled for
a particular QueryNode for which the indexes are known, and the
implementation of loadTuple does the right selection amongst the
Tuple attributes.
- loadTuple in interface TupleLoader
parameters
- The array of input ParameterOperands.
setFieldIndexes
public void setFieldIndexes(int[] indexes)