VError DB4DJournalParser::NextOperation( uLONG8 &outOperation, uLONG8 *outGlobalOperation, CDB4DJournalData **outJournalData )
{
VError error = VE_OK;
RecordHeader recHeader;
if ( outJournalData )
*outJournalData = NULL;
outOperation = fCurrentOperation;
sLONG8 globaloperation = 0;
if ( fFileStream )
{
uLONG operationTag;
error = fFileStream->GetLong(operationTag);
if ( error == VE_OK )
{
if ( operationTag == kTagLogDB4D )
{
sLONG8 contextID;
DB4D_LogAction logAction;
sLONG len;
sLONG8 curpos;
error = fFileStream->GetLong8(globaloperation);
if ( error == VE_OK )
{
error = fFileStream->GetLong(len);
}
if ( !outJournalData )
{
error = fFileStream->SetPosByOffset( len - 24 );//- 4 /*Tag*/ - 8 /*Operation#*/- 4 /*len*/ - 4 /*len at the end*/ - 4 /*tag at the end*/
}
else
{
if ( error == VE_OK )
error = fFileStream->GetLong((uLONG&)logAction);
if ( error == VE_OK )
error = fFileStream->GetLong8(contextID);
uLONG8 timeStamp;
if (error == VE_OK)
error = fFileStream->GetLong8(timeStamp);
if (error == VE_OK)
{
switch (logAction)
{
case DB4D_Log_OpenData:
case DB4D_Log_CloseData:
case DB4D_Log_StartBackup:
case DB4D_Log_StartTrans:
case DB4D_Log_Commit:
case DB4D_Log_RollBack:
{
*outJournalData = new VDB4DJournalData(globaloperation, logAction,contextID, GetContextExtraData( contextID),timeStamp);
}
break;
case DB4D_Log_CloseContext:
{
*outJournalData = new VDB4DJournalData(globaloperation, logAction,contextID, GetContextExtraData( contextID),timeStamp);
fContextExtraByID.erase(contextID);
}
break;
case DB4D_Log_CreateRecord:
case DB4D_Log_ModifyRecord:
{
VUUID xTableID;
if ( error == VE_OK )
error = recHeader.ReadFromStream(fFileStream);
if ( error == VE_OK )
if ( !recHeader.Match(DBOH_Record) )
error = VE_DB4D_WRONGRECORDHEADER;
if ( error == VE_OK )
error = xTableID.ReadFromStream(fFileStream);
curpos = fFileStream->GetPos();
if ( error == VE_OK )
{
sLONG dataSize = recHeader.GetLen() + sizeof(ChampHeader)*(recHeader.GetNbFields());
error = fFileStream->SetPosByOffset(dataSize);
}
if ( error == VE_OK )
*outJournalData = new VDB4DJournalData(globaloperation, logAction,contextID, GetContextExtraData( contextID),&recHeader,timeStamp, curpos, fFileStream, xTableID);
}
break;
case DB4D_Log_DeleteBlob:
{
VString path;
sLONG blobnumber;
if ( error == VE_OK )
error = fFileStream->GetLong(blobnumber);
if (blobnumber == -2)
{
sLONG lenpath = 0;
error = fFileStream->GetLong(lenpath);
if (lenpath > 0)
{
tempBuffer<256> buff(len);
error = fFileStream->GetWords((sWORD*)buff.GetPtr(), &lenpath);
path.FromBlock(buff.GetPtr(), lenpath * sizeof(UniChar), VTC_UTF_16);
}
}
VUUID xTableID;
if ( error == VE_OK )
error = xTableID.ReadFromStream(fFileStream);
if ( error == VE_OK )
{
VDB4DJournalData* jdata = new VDB4DJournalData(globaloperation, logAction,contextID, GetContextExtraData( contextID),timeStamp, blobnumber ,xTableID);
*outJournalData = jdata;
if (!path.IsEmpty())
{
jdata->SetPath(path);
}
}
}
break;
case DB4D_Log_DeleteRecord:
case DB4D_Log_TruncateTable:
{
sLONG recordNumber;
if ( error == VE_OK )
error = fFileStream->GetLong(recordNumber);
/*
sLONG tableIndex;
if ( error == VE_OK )
error = fFileStream->GetLong(tableIndex);
*/
VUUID xTableID;
if ( error == VE_OK )
error = xTableID.ReadFromStream(fFileStream);
if ( error == VE_OK )
*outJournalData = new VDB4DJournalData(globaloperation, logAction,contextID, GetContextExtraData( contextID),timeStamp,recordNumber,xTableID);
}
break;
case DB4D_Log_CreateContextWithUserUUID:
{
VUUID userID;
error = userID.ReadFromStream(fFileStream);
if (error == VE_OK)
*outJournalData = new VDB4DJournalData(globaloperation, logAction,contextID, GetContextExtraData( contextID),timeStamp,userID);
}
break;
case DB4D_Log_CreateContextWithExtra:
{
VValueBag *bag = new VValueBag;
if (bag != NULL)
{
// the extra data is always stored in little endian
Boolean oldNeedSwap = fFileStream->NeedSwap();
fFileStream->SetLittleEndian();
error = bag->ReadFromStream(fFileStream);
fFileStream->SetNeedSwap( oldNeedSwap);
if (error == VE_OK)
{
try
{
fContextExtraByID[contextID] = bag;
}
catch(...)
{
}
*outJournalData = new VDB4DJournalData(globaloperation, logAction,contextID, GetContextExtraData( contextID),timeStamp);
}
}
else
{
error = memfull;
}
ReleaseRefCountable( &bag);
}
break;
case DB4D_Log_CreateBlob:
case DB4D_Log_ModifyBlob:
{
VString path;
sLONG lenblob = 0;
sLONG blobNumber;
if ( error == VE_OK )
error = fFileStream->GetLong(blobNumber);
if (blobNumber == -2)
{
sLONG lenpath = 0;
error = fFileStream->GetLong(lenpath);
if (lenpath > 0)
{
tempBuffer<256> buff(len);
error = fFileStream->GetWords((sWORD*)buff.GetPtr(), &lenpath);
path.FromBlock(buff.GetPtr(), lenpath * sizeof(UniChar), VTC_UTF_16);
}
}
VUUID xTableID;
if ( error == VE_OK )
error = xTableID.ReadFromStream(fFileStream);
curpos = fFileStream->GetPos();
if ( error == VE_OK )
{
error = fFileStream->GetLong(lenblob);
error = fFileStream->SetPosByOffset(lenblob);
}
if ( error == VE_OK )
{
VDB4DJournalData* jdata = new VDB4DJournalData(globaloperation, logAction,contextID, GetContextExtraData( contextID),timeStamp, blobNumber, lenblob, xTableID, curpos, fFileStream);
*outJournalData = jdata;
if (!path.IsEmpty())
{
jdata->SetPath(path);
}
}
}
break;
case DB4D_Log_SaveSeqNum:
{
sLONG8 seqnum;
if ( error == VE_OK )
error = fFileStream->GetLong8(seqnum);
/*
sLONG tableIndex;
if ( error == VE_OK )
error = fFileStream->GetLong(tableIndex);
*/
VUUID xTableID;
if ( error == VE_OK )
error = xTableID.ReadFromStream(fFileStream);
if ( error == VE_OK )
*outJournalData = new VDB4DJournalData(globaloperation, logAction,contextID, GetContextExtraData( contextID), timeStamp, seqnum, xTableID, true);
}
break;
default:
assert(false);
break;
}
}
}
sLONG lenEnd;
if ( error == VE_OK )
{
error = fFileStream->GetLong(lenEnd);
if (len != lenEnd)
error = VE_UNIMPLEMENTED;
}
uLONG operationTagEnd;
if (error == VE_OK)
{
error = fFileStream->GetLong((uLONG&)operationTagEnd);
if (operationTagEnd != kTagLogDB4DEnd)
error = VE_UNIMPLEMENTED;
}
}
else
{
error = VE_UNIMPLEMENTED; // bad file
}
if ( error != VE_OK )
{
if ( outJournalData && *outJournalData )
{
(*outJournalData)->Release();
*outJournalData = NULL;
}
}
else
{
outOperation = ++fCurrentOperation;
if ( outJournalData && *outJournalData )
{
if ( fCurrentData )
fCurrentData->Release();
fCurrentData = *outJournalData;
fCurrentData->Retain();
}
}
}
}
else
{
error = VE_UNIMPLEMENTED; // not initialized
}
if (outGlobalOperation != NULL)
*outGlobalOperation = globaloperation;
return error;
}
