int OGRGFTResultLayer::RunSQL()
{
CPLString osChangedSQL(osSQL);
int bHasSetLimit = FALSE;
OGRGFTTableLayer* poTableLayer = NULL;
OGRFeatureDefn* poTableDefn = NULL;
CPLString osTableId;
if (EQUALN(osSQL.c_str(), "SELECT", 6))
{
size_t nPosFROM = osSQL.ifind(" FROM ");
if (nPosFROM == std::string::npos)
{
CPLError(CE_Failure, CPLE_AppDefined, "RunSQL() failed. Missing FROM in SELECT");
return FALSE;
}
CPLString osReminder;
nPosFROM += 6;
osTableId = OGRGFTExtractTableID(osSQL.c_str() + nPosFROM, osReminder);
poTableLayer = (OGRGFTTableLayer*) poDS->GetLayerByName(osTableId);
if (poTableLayer != NULL)
poTableDefn = poTableLayer->GetLayerDefn();
if (poTableLayer != NULL &&
poTableLayer->GetTableId().size() &&
!EQUAL(osTableId, poTableLayer->GetTableId()))
{
osChangedSQL = osSQL;
osChangedSQL.resize(nPosFROM);
osChangedSQL += poTableLayer->GetTableId();
osChangedSQL += osReminder;
osSQL = osChangedSQL;
CPLDebug("GFT", "Patching table name (%s) to table id (%s)",
osTableId.c_str(), poTableLayer->GetTableId().c_str());
}
int nFeaturesToFetch = GetFeaturesToFetch();
if (osSQL.ifind(" OFFSET ") == std::string::npos &&
osSQL.ifind(" LIMIT ") == std::string::npos &&
nFeaturesToFetch > 0)
{
osChangedSQL += CPLSPrintf(" LIMIT %d", nFeaturesToFetch);
bHasSetLimit = TRUE;
}
}
else
{
bGotAllRows = bEOF = TRUE;
poFeatureDefn->SetGeomType( wkbNone );
}
CPLHTTPResult * psResult = poDS->RunSQL(osChangedSQL);
if (psResult == NULL)
return FALSE;
char* pszLine = (char*) psResult->pabyData;
if (pszLine == NULL ||
psResult->pszErrBuf != NULL)
{
CPLError(CE_Failure, CPLE_AppDefined, "RunSQL() failed");
CPLHTTPDestroyResult(psResult);
return FALSE;
}
if (EQUALN(osSQL.c_str(), "SELECT", 6) ||
EQUAL(osSQL.c_str(), "SHOW TABLES") ||
EQUALN(osSQL.c_str(), "DESCRIBE", 8))
{
ParseCSVResponse(pszLine, aosRows);
if (aosRows.size() > 0)
{
char** papszTokens = OGRGFTCSVSplitLine(aosRows[0], ',');
for(int i=0;papszTokens && papszTokens[i];i++)
{
CPLString osLaunderedColName(LaunderColName(papszTokens[i]));
int iIndex = (poTableDefn) ? poTableDefn->GetFieldIndex(osLaunderedColName) : -1;
if (iIndex >= 0)
{
poFeatureDefn->AddFieldDefn(poTableDefn->GetFieldDefn(iIndex));
if (iIndex == poTableLayer->GetGeometryFieldIndex())
iGeometryField = i;
if (iIndex == poTableLayer->GetLatitudeFieldIndex())
iLatitudeField = i;
if (iIndex == poTableLayer->GetLongitudeFieldIndex())
iLongitudeField = i;
}
else
{
OGRFieldType eType = OFTString;
if (EQUAL(osLaunderedColName, "COUNT()"))
eType = OFTInteger;
OGRFieldDefn oFieldDefn(osLaunderedColName, eType);
poFeatureDefn->AddFieldDefn(&oFieldDefn);
}
}
CSLDestroy(papszTokens);
aosRows.erase(aosRows.begin());
}
if (iLatitudeField >= 0 && iLongitudeField >= 0)
{
iGeometryField = iLatitudeField;
poFeatureDefn->SetGeomType( wkbPoint );
}
if (bHasSetLimit)
bGotAllRows = bEOF = (int)aosRows.size() < GetFeaturesToFetch();
else
bGotAllRows = bEOF = TRUE;
}
SetGeomFieldName();
CPLHTTPDestroyResult(psResult);
return TRUE;
}
int OGRGFTTableLayer::FetchDescribe()
{
poFeatureDefn = new OGRFeatureDefn( osTableName );
poFeatureDefn->Reference();
poFeatureDefn->GetGeomFieldDefn(0)->SetSpatialRef(poSRS);
const CPLString& osAuth = poDS->GetAccessToken();
std::vector<CPLString> aosHeaderAndFirstDataLine;
if (osAuth.size())
{
CPLString osSQL("DESCRIBE ");
osSQL += osTableId;
CPLHTTPResult * psResult = poDS->RunSQL(osSQL);
if (psResult == NULL)
return FALSE;
char* pszLine = (char*) psResult->pabyData;
if (pszLine == NULL ||
psResult->pszErrBuf != NULL ||
strncmp(pszLine, "column id,name,type",
strlen("column id,name,type")) != 0)
{
CPLHTTPDestroyResult(psResult);
return FALSE;
}
pszLine = OGRGFTGotoNextLine(pszLine);
std::vector<CPLString> aosLines;
ParseCSVResponse(pszLine, aosLines);
for(int i=0;i<(int)aosLines.size();i++)
{
char** papszTokens = OGRGFTCSVSplitLine(aosLines[i], ',');
if (CSLCount(papszTokens) == 3)
{
aosColumnInternalName.push_back(papszTokens[0]);
//CPLDebug("GFT", "%s %s %s", papszTokens[0], papszTokens[1], papszTokens[2]);
OGRFieldType eType = OFTString;
if (EQUAL(papszTokens[2], "number"))
eType = OFTReal;
else if (EQUAL(papszTokens[2], "datetime"))
eType = OFTDateTime;
if (EQUAL(papszTokens[2], "location") && osGeomColumnName.size() == 0)
{
if (iGeometryField < 0)
iGeometryField = poFeatureDefn->GetFieldCount();
else
CPLDebug("GFT", "Multiple geometry fields detected. "
"Only first encountered one is handled");
}
CPLString osLaunderedColName(LaunderColName(papszTokens[1]));
OGRFieldDefn oFieldDefn(osLaunderedColName, eType);
poFeatureDefn->AddFieldDefn(&oFieldDefn);
}
CSLDestroy(papszTokens);
}
CPLHTTPDestroyResult(psResult);
}
else
{
/* http://code.google.com/intl/fr/apis/fusiontables/docs/developers_guide.html#Exploring states */
/* that DESCRIBE should work on public tables without authentication, but it is not true... */
CPLString osSQL("SELECT * FROM ");
osSQL += osTableId;
osSQL += " OFFSET 0 LIMIT 1";
CPLHTTPResult * psResult = poDS->RunSQL(osSQL);
if (psResult == NULL)
return FALSE;
char* pszLine = (char*) psResult->pabyData;
if (pszLine == NULL || psResult->pszErrBuf != NULL)
{
CPLHTTPDestroyResult(psResult);
return FALSE;
}
ParseCSVResponse(pszLine, aosHeaderAndFirstDataLine);
if (aosHeaderAndFirstDataLine.size() > 0)
{
char** papszTokens = OGRGFTCSVSplitLine(aosHeaderAndFirstDataLine[0], ',');
for(int i=0;papszTokens && papszTokens[i];i++)
{
CPLString osLaunderedColName(LaunderColName(papszTokens[i]));
OGRFieldDefn oFieldDefn(osLaunderedColName, OFTString);
poFeatureDefn->AddFieldDefn(&oFieldDefn);
}
CSLDestroy(papszTokens);
}
CPLHTTPDestroyResult(psResult);
}
if (osGeomColumnName.size() > 0)
{
iGeometryField = poFeatureDefn->GetFieldIndex(osGeomColumnName);
if (iGeometryField < 0)
{
CPLError(CE_Warning, CPLE_AppDefined,
"Cannot find column called %s", osGeomColumnName.c_str());
}
}
for(int i=0;i<poFeatureDefn->GetFieldCount();i++)
{
const char* pszName = poFeatureDefn->GetFieldDefn(i)->GetNameRef();
if (EQUAL(pszName, "latitude") || EQUAL(pszName, "lat") ||
EQUAL(pszName, "latdec"))
iLatitudeField = i;
else if (EQUAL(pszName, "longitude") || EQUAL(pszName, "lon") ||
EQUAL(pszName, "londec") || EQUAL(pszName, "long"))
iLongitudeField = i;
}
if (iLatitudeField >= 0 && iLongitudeField >= 0)
{
if (iGeometryField < 0)
iGeometryField = iLatitudeField;
poFeatureDefn->GetFieldDefn(iLatitudeField)->SetType(OFTReal);
poFeatureDefn->GetFieldDefn(iLongitudeField)->SetType(OFTReal);
poFeatureDefn->SetGeomType( wkbPoint );
}
else if (iGeometryField < 0 && osGeomColumnName.size() == 0)
{
iLatitudeField = iLongitudeField = -1;
/* In the unauthentified case, we try to parse the first record to */
/* autodetect the geometry field */
OGRwkbGeometryType eType = wkbUnknown;
if (aosHeaderAndFirstDataLine.size() == 2)
{
char** papszTokens = OGRGFTCSVSplitLine(aosHeaderAndFirstDataLine[1], ',');
if (CSLCount(papszTokens) == poFeatureDefn->GetFieldCount())
{
for(int i=0;i<poFeatureDefn->GetFieldCount();i++)
{
const char* pszVal = papszTokens[i];
if (pszVal != NULL &&
(strncmp(pszVal, "<Point>", 7) == 0 ||
strncmp(pszVal, "<LineString>", 12) == 0 ||
strncmp(pszVal, "<Polygon>", 9) == 0 ||
strncmp(pszVal, "<MultiGeometry>", 15) == 0))
{
if (iGeometryField < 0)
{
iGeometryField = i;
}
else
{
CPLDebug("GFT", "Multiple geometry fields detected. "
"Only first encountered one is handled");
}
}
else if (pszVal)
{
/* http://www.google.com/fusiontables/DataSource?dsrcid=423292 */
char** papszTokens2 = CSLTokenizeString2(pszVal, " ,", 0);
if (CSLCount(papszTokens2) == 2 &&
CPLGetValueType(papszTokens2[0]) == CPL_VALUE_REAL &&
CPLGetValueType(papszTokens2[1]) == CPL_VALUE_REAL &&
fabs(CPLAtof(papszTokens2[0])) <= 90 &&
fabs(CPLAtof(papszTokens2[1])) <= 180 )
{
if (iGeometryField < 0)
{
iGeometryField = i;
eType = wkbPoint;
}
else
{
CPLDebug("GFT", "Multiple geometry fields detected. "
"Only first encountered one is handled");
}
}
CSLDestroy(papszTokens2);
}
}
}
CSLDestroy(papszTokens);
}
if (iGeometryField < 0)
poFeatureDefn->SetGeomType( wkbNone );
else
poFeatureDefn->SetGeomType( eType );
}
SetGeomFieldName();
return TRUE;
}
