/*------------------------------------------------------------------------------
* function: AttrProj::ReadRec
* Read a record from the data source, and project it onto the attribute
* combinations corresponding to this object.
*/
DevStatus
AttrProj::ReadRec(RecId recId, VectorArray &vecArray)
{
DO_DEBUG(printf("AttrProj::ReadRec(%d)\n", (int) recId));
int dataSize;
int numRecs;
DevStatus result = StatusOk;
TData::TDHandle handle = _tDataP->InitGetRecs(recId, recId);
if (!_tDataP->GetRecs(handle, _recBuf, _recBufSize,
recId, numRecs, dataSize))
{
result = StatusFailed;
}
else
{
AttrList * attrListP = _tDataP->GetAttrList();
int projNum = 0;
Projection * projP = _projList.GetFirstProj();
while (projP != NULL)
{
Vector * vectorP = vecArray.GetVector(projNum);
int projAttrNum;
for (projAttrNum = 0; projAttrNum < projP->attrCount;
projAttrNum++)
{
int attrNum = projP->attrList[projAttrNum];
AttrInfo * attrInfoP = attrListP->Get(attrNum);
vectorP->value[projAttrNum] = AttrToDouble(attrInfoP->type,
_recBuf + attrInfoP->offset);
}
projP = _projList.GetNextProj();
projNum++;
}
}
_tDataP->DoneGetRecs(handle);
return result;
}
/*------------------------------------------------------------------------------
* function: AttrProj::ParseProjection
* Parse the attribute projection file and build up the corresponding
* data structures.
*/
DevStatus
AttrProj::ParseProjection(char *attrProjFile)
{
DO_DEBUG(printf("AttrProj::ParseProjection()\n"));
DevStatus result = StatusOk;
FILE * file = fopen(attrProjFile, "r");
if (file == NULL)
{
fprintf(stderr, "Can't open attribute projection file\n");
result = StatusFailed;
}
else
{
const int bufSize = 4096;
char buf[bufSize];
char separators[] = " \t";
/* Get each line in the attribute projection file. */
while (fgets(buf, bufSize, file) != NULL)
{
DOASSERT(buf[strlen(buf)-1] == '\n',
"Projection file line too long");
/* TEMPTEMP -- we should look for some kind of comment char. */
StripTrailingNewline(buf);
DO_DEBUG(printf("%s\n", buf));
Projection projection;
char * token = strtok(buf, separators);
if (token == NULL) continue;
projection.attrCount = atoi(token);
DO_DEBUG(printf("projection.attrCount = %d\n",
projection.attrCount));
projection.attrList = new int[projection.attrCount];
AttrList * attrListP = _tDataP->GetAttrList();
int attrCount = attrListP->NumAttrs();
int projAttrNum = 0;
/* Find each attribute specified for this projection. */
while ((token = strtok(NULL, separators)) != NULL)
{
projection.attrList[projAttrNum] = illegalAttr;
DO_DEBUG(printf(" token = %s", token));
int attrNum;
/* Now find the attribute in the TData corresponding to
* the name specified in the projection. */
for (attrNum = 0; attrNum < attrCount; attrNum++)
{
AttrInfo * attrInfoP = attrListP->Get(attrNum);
if (!strcmp(token, attrInfoP->name))
{
DO_DEBUG(printf(" attrNum = %d\n", attrNum));
projection.attrList[projAttrNum] = attrNum;
break;
}
}
DOASSERT(projection.attrList[projAttrNum] != illegalAttr,
"Illegal attribute name in attribute projection file");
projAttrNum++;
}
DOASSERT(projAttrNum == projection.attrCount,
"Incorrect number of attributes in projection file");
_projList.AddProjection(projection);
}
fclose(file);
}
return result;
}
