int OGRSQLiteSelectLayer::TestCapability( const char * pszCap )
{
if (EQUAL(pszCap,OLCFastSpatialFilter))
{
if (osSQLCurrent != osSQLBase)
return TRUE;
size_t i = 0;
OGRSQLiteLayer* poBaseLayer = GetBaseLayer(i);
if (poBaseLayer == NULL)
{
CPLDebug("SQLITE", "Cannot find base layer");
return FALSE;
}
OGRPolygon oFakePoly;
const char* pszWKT = "POLYGON((0 0,0 1,1 1,1 0,0 0))";
oFakePoly.importFromWkt((char**) &pszWKT);
CPLString osSpatialWhere = poBaseLayer->GetSpatialWhere(&oFakePoly);
return osSpatialWhere.size() != 0;
}
else
return OGRSQLiteLayer::TestCapability( pszCap );
}
int OGRSQLiteSelectLayerCommonBehaviour::TestCapability( const char * pszCap )
{
if (EQUAL(pszCap,OLCFastSpatialFilter))
{
size_t i = 0;
std::pair<OGRLayer*, IOGRSQLiteGetSpatialWhere*> oPair = GetBaseLayer(i);
if (oPair.first == NULL)
{
CPLDebug("SQLITE", "Cannot find base layer");
return FALSE;
}
return oPair.second->HasFastSpatialFilter(0);
}
else
return poLayer->BaseTestCapability( pszCap );
}
int OGRSQLiteSelectLayerCommonBehaviour::BuildSQL()
{
osSQLCurrent = osSQLBase;
bSpatialFilterInSQL = TRUE;
size_t i = 0;
std::pair<OGRLayer*, IOGRSQLiteGetSpatialWhere*> oPair = GetBaseLayer(i);
OGRLayer* poBaseLayer = oPair.first;
if (poBaseLayer == NULL)
{
CPLDebug("SQLITE", "Cannot find base layer");
bSpatialFilterInSQL = FALSE;
return FALSE;
}
CPLString osSpatialWhere;
if (poLayer->GetFilterGeom() != NULL)
{
const char* pszGeomCol =
poLayer->GetLayerDefn()->GetGeomFieldDefn(poLayer->GetIGeomFieldFilter())->GetNameRef();
int nIdx = poBaseLayer->GetLayerDefn()->GetGeomFieldIndex(pszGeomCol);
if( nIdx < 0 )
{
CPLDebug("SQLITE", "Cannot find field %s in base layer", pszGeomCol);
bSpatialFilterInSQL = FALSE;
}
else
{
osSpatialWhere = oPair.second->GetSpatialWhere(nIdx, poLayer->GetFilterGeom());
if (osSpatialWhere.size() == 0)
{
CPLDebug("SQLITE", "Cannot get spatial where clause");
bSpatialFilterInSQL = FALSE;
}
}
}
CPLString osCustomWhere;
if( osSpatialWhere.size() != 0 )
{
osCustomWhere = osSpatialWhere;
}
if( poLayer->GetAttrQueryString() != NULL && poLayer->GetAttrQueryString()[0] != '\0' )
{
if( osSpatialWhere.size() != 0)
osCustomWhere += " AND (";
osCustomWhere += poLayer->GetAttrQueryString();
if( osSpatialWhere.size() != 0)
osCustomWhere += ")";
}
/* Nothing to do */
if( osCustomWhere.size() == 0 )
return TRUE;
while (i < osSQLBase.size() && osSQLBase[i] == ' ')
i ++;
if (i < osSQLBase.size() && STARTS_WITH_CI(osSQLBase.c_str() + i, "WHERE "))
{
osSQLCurrent = osSQLBase.substr(0, i + 6);
osSQLCurrent += osCustomWhere;
osSQLCurrent += " AND (";
size_t nEndOfWhere = osSQLBase.ifind(" GROUP ");
if (nEndOfWhere == std::string::npos)
nEndOfWhere = osSQLBase.ifind(" ORDER ");
if (nEndOfWhere == std::string::npos)
nEndOfWhere = osSQLBase.ifind(" LIMIT ");
if (nEndOfWhere == std::string::npos)
{
osSQLCurrent += osSQLBase.substr(i + 6);
osSQLCurrent += ")";
}
else
{
osSQLCurrent += osSQLBase.substr(i + 6, nEndOfWhere - (i + 6));
osSQLCurrent += ")";
osSQLCurrent += osSQLBase.substr(nEndOfWhere);
}
}
else if (i < osSQLBase.size() &&
(STARTS_WITH_CI(osSQLBase.c_str() + i, "GROUP ") ||
STARTS_WITH_CI(osSQLBase.c_str() + i, "ORDER ") ||
STARTS_WITH_CI(osSQLBase.c_str() + i, "LIMIT ")))
{
osSQLCurrent = osSQLBase.substr(0, i);
osSQLCurrent += " WHERE ";
osSQLCurrent += osCustomWhere;
osSQLCurrent += " ";
osSQLCurrent += osSQLBase.substr(i);
}
else if (i == osSQLBase.size())
{
osSQLCurrent = osSQLBase.substr(0, i);
osSQLCurrent += " WHERE ";
osSQLCurrent += osCustomWhere;
}
else
{
CPLDebug("SQLITE", "SQL expression too complex for the driver to insert attribute and/or spatial filter in it");
bSpatialFilterInSQL = FALSE;
return FALSE;
}
return TRUE;
}
int OGRSQLiteSelectLayer::RebuildSQLWithSpatialClause()
{
osSQLCurrent = osSQLBase;
if (m_poFilterGeom == NULL)
{
return TRUE;
}
size_t i = 0;
OGRSQLiteLayer* poBaseLayer = GetBaseLayer(i);
if (poBaseLayer == NULL)
{
CPLDebug("SQLITE", "Cannot find base layer");
return FALSE;
}
CPLString osSpatialWhere = poBaseLayer->GetSpatialWhere(m_poFilterGeom);
if (osSpatialWhere.size() == 0)
{
CPLDebug("SQLITE", "Cannot get spatial where clause");
return FALSE;
}
while (i < osSQLBase.size() && osSQLBase[i] == ' ')
i ++;
if (i < osSQLBase.size() && EQUALN(osSQLBase.c_str() + i, "WHERE ", 6))
{
osSQLCurrent = osSQLBase.substr(0, i + 6);
osSQLCurrent += osSpatialWhere;
osSQLCurrent += " AND (";
size_t nEndOfWhere = osSQLBase.ifind(" GROUP ");
if (nEndOfWhere == std::string::npos)
nEndOfWhere = osSQLBase.ifind(" ORDER ");
if (nEndOfWhere == std::string::npos)
nEndOfWhere = osSQLBase.ifind(" LIMIT ");
if (nEndOfWhere == std::string::npos)
{
osSQLCurrent += osSQLBase.substr(i + 6);
osSQLCurrent += ")";
}
else
{
osSQLCurrent += osSQLBase.substr(i + 6, nEndOfWhere - (i + 6));
osSQLCurrent += ")";
osSQLCurrent += osSQLBase.substr(nEndOfWhere);
}
}
else if (i < osSQLBase.size() &&
(EQUALN(osSQLBase.c_str() + i, "GROUP ", 6) ||
EQUALN(osSQLBase.c_str() + i, "ORDER ", 6) ||
EQUALN(osSQLBase.c_str() + i, "LIMIT ", 6)))
{
osSQLCurrent = osSQLBase.substr(0, i);
osSQLCurrent += " WHERE ";
osSQLCurrent += osSpatialWhere;
osSQLCurrent += " ";
osSQLCurrent += osSQLBase.substr(i);
}
else if (i == osSQLBase.size())
{
osSQLCurrent = osSQLBase.substr(0, i);
osSQLCurrent += " WHERE ";
osSQLCurrent += osSpatialWhere;
}
else
{
CPLDebug("SQLITE", "SQL expression too complex for the driver to insert spatial filter in it");
return FALSE;
}
return TRUE;
}
