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/*
========== licence begin GPL
Copyright (C) 2002-2003 SAP AG
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
========== licence end
*/
package com.sap.dbtech.jdbc.packet;
import com.sap.dbtech.util.StructuredMem;
import com.sap.dbtech.vsp001.Part;
import com.sap.dbtech.vsp001.PartAttributes;
/**
*
*/
public class DataPartBase
extends com.sap.dbtech.util.MemIndirection
{
final private static int maxArgCount = Short.MAX_VALUE;
protected int argCount = 0;
protected int extent = 0;
protected int massExtent = 0;
private boolean isFull = false;
StructuredMem originalMem;
RequestPacket requestPacket;
/**
* DataPartBase constructor comment.
* @param rawMem com.sap.dbtech.util.StructuredMem
*/
DataPartBase(
StructuredMem rawMem,
RequestPacket requestPacket)
{
super(rawMem);
this.originalMem = rawMem.getPointer(0);
this.requestPacket = requestPacket;
}
/**
*
* @param pos int
* @param len int
*/
public void addArg (
int pos,
int len)
{
++this.argCount;
this.extent = Math.max (this.extent, pos + len);
}
/**
*
*/
public void close ()
{
int argCountOffs = -Part.Data_O + Part.ArgCount_O;
this.originalMem.putInt2 (this.argCount, argCountOffs);
this.requestPacket.closePart(this.massExtent + this.extent, this.argCount);
}
/**
*
*/
public void closeArrayPart (
int rows)
{
int argCountOffs = -Part.Data_O + Part.ArgCount_O;
this.originalMem.putInt2 (rows, argCountOffs);
this.requestPacket.closePart(this.massExtent + this.extent * rows, rows);
}
protected int getMaxDataSize() {
return this.size() - this.extent -8;
}
/**
*
* @return boolean
* @param recordSize int
*/
public boolean hasRoomFor (
int recordSize,
int reserve)
{
return ( this.argCount < maxArgCount
&& (this.size () - this.extent) > (recordSize + reserve)
);
}
/**
*
* @return boolean
* @param recordSize int
*/
public boolean hasRoomFor (
int recordSize)
{
return ( this.argCount < maxArgCount
&& (this.size () - this.extent) > recordSize
);
}
/**
*
* @param pos int
* @param len int
*/
public void putNull (
int pos,
int len)
{
this.putInt1 (-1, pos -1);
this.putBytes (new byte [len], pos);
this.addArg (pos, len);
}
/**
*
*/
public int getExtent ()
{
return this.extent;
}
/**
*
*
*/
public void setFirstPart () {
this.requestPacket.addPartAttribute (PartAttributes.FirstPacket_E);
if (false) {
int attrOffs = -Part.Data_O + Part.Attributes_O;
int partAttributes;
partAttributes = this.originalMem.getInt1 (attrOffs);
partAttributes |= PartAttributes.FirstPacket_E;
this.originalMem.putInt1 (attrOffs, partAttributes);
}
}
/**
*
*
*/
public void setLastPart () {
this.requestPacket.addPartAttribute (PartAttributes.LastPacket_E);
if (false) {
int attrOffs = -Part.Data_O + Part.Attributes_O;
int partAttributes;
partAttributes = this.originalMem.getInt1 (attrOffs);
partAttributes |= PartAttributes.LastPacket_E;
this.originalMem.putInt1 (attrOffs, partAttributes);
}
}
/**
*
*/
public void
moveRecordBase ()
{
this.moveBase (this.extent);
this.massExtent += this.extent;
this.extent = 0;
}
}
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