OGRErr OGRESRIFeatureServiceLayer::GetExtent(OGREnvelope *psExtent, int bForce)
{
OGRErr eErr = OGRERR_FAILURE;
CPLString osNewURL = CPLURLAddKVP(poDS->GetURL(), "returnExtentOnly", "true");
osNewURL = CPLURLAddKVP(osNewURL, "f", "geojson");
CPLErrorReset();
CPLHTTPResult* pResult = CPLHTTPFetch( osNewURL, NULL );
if( pResult != NULL && pResult->nDataLen != 0 && CPLGetLastErrorNo() == 0 &&
pResult->nStatus == 0 )
{
const char* pszBBox = strstr((const char*)pResult->pabyData, "\"bbox\"");
if( pszBBox )
{
pszBBox = strstr(pszBBox, ":[");
if( pszBBox )
{
pszBBox+=2;
char** papszTokens = CSLTokenizeString2(pszBBox, ",", 0);
if( CSLCount(papszTokens) >= 4 )
{
psExtent->MinX = CPLAtof(papszTokens[0]);
psExtent->MinY = CPLAtof(papszTokens[1]);
psExtent->MaxX = CPLAtof(papszTokens[2]);
psExtent->MaxY = CPLAtof(papszTokens[3]);
eErr = OGRERR_NONE;
}
CSLDestroy(papszTokens);
}
}
}
CPLHTTPDestroyResult( pResult );
if( eErr == OGRERR_FAILURE )
eErr = OGRLayer::GetExtent(psExtent, bForce);
return eErr;
}
OGRESRIFeatureServiceDataset::OGRESRIFeatureServiceDataset(const CPLString &osURL,
OGRGeoJSONDataSource* poFirst)
{
poCurrent = poFirst;
poLayer = new OGRESRIFeatureServiceLayer(this);
this->osURL = osURL;
if( CPLURLGetValue(this->osURL, "resultRecordCount").size() == 0 )
{
// We assume that if the server sets the exceededTransferLimit, the
// and resultRecordCount is not set, the number of features returned
// in our first request is the maximum allowed by the server
// So set it for following requests
this->osURL = CPLURLAddKVP(this->osURL, "resultRecordCount",
CPLSPrintf("%d", (int)poFirst->GetLayer(0)->GetFeatureCount()));
}
else
{
int nUserSetRecordCount = atoi(CPLURLGetValue(this->osURL, "resultRecordCount"));
if( nUserSetRecordCount > poFirst->GetLayer(0)->GetFeatureCount() )
{
CPLError(CE_Warning, CPLE_AppDefined,
"Specificied resultRecordCount=%d is greater than the maximum %d supported by the server",
nUserSetRecordCount, (int)poFirst->GetLayer(0)->GetFeatureCount() );
}
}
nFirstOffset = CPLAtoGIntBig(CPLURLGetValue(this->osURL, "resultOffset"));
nLastOffset = nFirstOffset;
}
GIntBig OGRESRIFeatureServiceLayer::GetFeatureCount( int bForce )
{
GIntBig nFeatureCount = -1;
if( m_poAttrQuery == NULL && m_poFilterGeom == NULL )
{
CPLString osNewURL = CPLURLAddKVP(poDS->GetURL(), "returnCountOnly", "true");
CPLHTTPResult* pResult = NULL;
CPLErrorReset();
pResult = CPLHTTPFetch( osNewURL, NULL );
if( pResult != NULL && pResult->nDataLen != 0 && CPLGetLastErrorNo() == 0 &&
pResult->nStatus == 0 )
{
const char* pszCount = strstr((const char*)pResult->pabyData, "\"count\"");
if( pszCount )
{
pszCount = strchr(pszCount, ':');
if( pszCount )
{
pszCount++;
nFeatureCount = CPLAtoGIntBig(pszCount);
}
}
}
CPLHTTPDestroyResult( pResult );
}
if( nFeatureCount < 0 )
nFeatureCount = OGRLayer::GetFeatureCount(bForce);
return nFeatureCount;
}
int OGRESRIFeatureServiceDataset::LoadPage()
{
CPLString osNewURL = CPLURLAddKVP(osURL, "resultOffset",
CPLSPrintf(CPL_FRMT_GIB, nLastOffset));
OGRGeoJSONDataSource* poDS = NULL;
poDS = new OGRGeoJSONDataSource();
GDALOpenInfo oOpenInfo(osNewURL, GA_ReadOnly);
if( !poDS->Open( &oOpenInfo, GeoJSONGetSourceType( &oOpenInfo ) ) ||
poDS->GetLayerCount() == 0 )
{
delete poDS;
poDS= NULL;
return FALSE;
}
delete poCurrent;
poCurrent = poDS;
return TRUE;
}
static
CPLXMLNode * GDALWMSDatasetGetConfigFromURL(GDALOpenInfo *poOpenInfo)
{
const char* pszBaseURL = poOpenInfo->pszFilename;
if (EQUALN(pszBaseURL, "WMS:", 4))
pszBaseURL += 4;
CPLString osLayer = CPLURLGetValue(pszBaseURL, "LAYERS");
CPLString osVersion = CPLURLGetValue(pszBaseURL, "VERSION");
CPLString osSRS = CPLURLGetValue(pszBaseURL, "SRS");
CPLString osCRS = CPLURLGetValue(pszBaseURL, "CRS");
CPLString osBBOX = CPLURLGetValue(pszBaseURL, "BBOX");
CPLString osFormat = CPLURLGetValue(pszBaseURL, "FORMAT");
CPLString osTransparent = CPLURLGetValue(pszBaseURL, "TRANSPARENT");
/* GDAL specific extensions to alter the default settings */
CPLString osOverviewCount = CPLURLGetValue(pszBaseURL, "OVERVIEWCOUNT");
CPLString osTileSize = CPLURLGetValue(pszBaseURL, "TILESIZE");
CPLString osMinResolution = CPLURLGetValue(pszBaseURL, "MINRESOLUTION");
CPLString osBBOXOrder = CPLURLGetValue(pszBaseURL, "BBOXORDER");
CPLString osBaseURL = pszBaseURL;
/* Remove all keywords to get base URL */
osBaseURL = CPLURLAddKVP(osBaseURL, "VERSION", NULL);
osBaseURL = CPLURLAddKVP(osBaseURL, "REQUEST", NULL);
osBaseURL = CPLURLAddKVP(osBaseURL, "LAYERS", NULL);
osBaseURL = CPLURLAddKVP(osBaseURL, "SRS", NULL);
osBaseURL = CPLURLAddKVP(osBaseURL, "CRS", NULL);
osBaseURL = CPLURLAddKVP(osBaseURL, "BBOX", NULL);
osBaseURL = CPLURLAddKVP(osBaseURL, "FORMAT", NULL);
osBaseURL = CPLURLAddKVP(osBaseURL, "TRANSPARENT", NULL);
osBaseURL = CPLURLAddKVP(osBaseURL, "STYLES", NULL);
osBaseURL = CPLURLAddKVP(osBaseURL, "WIDTH", NULL);
osBaseURL = CPLURLAddKVP(osBaseURL, "HEIGHT", NULL);
osBaseURL = CPLURLAddKVP(osBaseURL, "OVERVIEWCOUNT", NULL);
osBaseURL = CPLURLAddKVP(osBaseURL, "TILESIZE", NULL);
osBaseURL = CPLURLAddKVP(osBaseURL, "MINRESOLUTION", NULL);
osBaseURL = CPLURLAddKVP(osBaseURL, "BBOXORDER", NULL);
if (osBaseURL.size() > 0 && osBaseURL[osBaseURL.size() - 1] == '&')
osBaseURL.resize(osBaseURL.size() - 1);
if (osVersion.size() == 0)
osVersion = "1.1.1";
CPLString osSRSTag;
CPLString osSRSValue;
if(VersionStringToInt(osVersion.c_str())>= VersionStringToInt("1.3.0"))
{
if (osSRS.size())
{
CPLError(CE_Warning, CPLE_AppDefined,
"WMS version 1.3 and above expects CRS however SRS was set instead.");
}
osSRSValue = osCRS;
osSRSTag = "CRS";
}
else
{
if (osCRS.size())
{
CPLError(CE_Warning, CPLE_AppDefined,
"WMS version 1.1.1 and below expects SRS however CRS was set instead.");
}
osSRSValue = osSRS;
osSRSTag = "SRS";
}
if (osSRSValue.size() == 0)
osSRSValue = "EPSG:4326";
if (osBBOX.size() == 0)
{
if (osBBOXOrder.compare("yxYX") == 0)
osBBOX = "-90,-180,90,180";
else
osBBOX = "-180,-90,180,90";
}
char** papszTokens = CSLTokenizeStringComplex(osBBOX, ",", 0, 0);
if (CSLCount(papszTokens) != 4)
{
CSLDestroy(papszTokens);
return NULL;
}
const char* pszMinX = papszTokens[0];
const char* pszMinY = papszTokens[1];
const char* pszMaxX = papszTokens[2];
const char* pszMaxY = papszTokens[3];
if (osBBOXOrder.compare("yxYX") == 0)
{
std::swap(pszMinX, pszMinY);
std::swap(pszMaxX, pszMaxY);
}
double dfMinX = CPLAtofM(pszMinX);
double dfMinY = CPLAtofM(pszMinY);
double dfMaxX = CPLAtofM(pszMaxX);
double dfMaxY = CPLAtofM(pszMaxY);
if (dfMaxY <= dfMinY || dfMaxX <= dfMinX)
{
CSLDestroy(papszTokens);
return NULL;
}
int nTileSize = atoi(osTileSize);
if (nTileSize <= 128 || nTileSize > 2048)
nTileSize = 1024;
int nXSize, nYSize;
int nOverviewCount = (osOverviewCount.size()) ? atoi(osOverviewCount) : 20;
if (osMinResolution.size() != 0)
{
double dfMinResolution = CPLAtofM(osMinResolution);
while (nOverviewCount > 20)
{
nOverviewCount --;
dfMinResolution *= 2;
}
nXSize = (int) ((dfMaxX - dfMinX) / dfMinResolution + 0.5);
nYSize = (int) ((dfMaxY - dfMinY) / dfMinResolution + 0.5);
}
else
{
double dfRatio = (dfMaxX - dfMinX) / (dfMaxY - dfMinY);
if (dfRatio > 1)
{
nXSize = nTileSize;
nYSize = (int) (nXSize / dfRatio);
}
else
{
nYSize = nTileSize;
nXSize = (int) (nYSize * dfRatio);
}
if (nOverviewCount < 0 || nOverviewCount > 20)
nOverviewCount = 20;
nXSize = nXSize * (1 << nOverviewCount);
nYSize = nYSize * (1 << nOverviewCount);
}
int bTransparent = osTransparent.size() ? CSLTestBoolean(osTransparent) : FALSE;
if (osFormat.size() == 0)
{
if (!bTransparent)
{
osFormat = "image/jpeg";
}
else
{
osFormat = "image/png";
}
}
char* pszEscapedURL = CPLEscapeString(osBaseURL.c_str(), -1, CPLES_XML);
char* pszEscapedLayerURL = CPLEscapeString(osLayer.c_str(), -1, CPLES_URL);
char* pszEscapedLayerXML = CPLEscapeString(pszEscapedLayerURL, -1, CPLES_XML);
CPLString osXML = CPLSPrintf(
"<GDAL_WMS>\n"
" <Service name=\"WMS\">\n"
" <Version>%s</Version>\n"
" <ServerUrl>%s</ServerUrl>\n"
" <Layers>%s</Layers>\n"
" <%s>%s</%s>\n"
" <ImageFormat>%s</ImageFormat>\n"
" <Transparent>%s</Transparent>\n"
" <BBoxOrder>%s</BBoxOrder>\n"
" </Service>\n"
" <DataWindow>\n"
" <UpperLeftX>%s</UpperLeftX>\n"
" <UpperLeftY>%s</UpperLeftY>\n"
" <LowerRightX>%s</LowerRightX>\n"
" <LowerRightY>%s</LowerRightY>\n"
" <SizeX>%d</SizeX>\n"
" <SizeY>%d</SizeY>\n"
" </DataWindow>\n"
" <BandsCount>%d</BandsCount>\n"
" <BlockSizeX>%d</BlockSizeX>\n"
" <BlockSizeY>%d</BlockSizeY>\n"
" <OverviewCount>%d</OverviewCount>\n"
"</GDAL_WMS>\n",
osVersion.c_str(),
pszEscapedURL,
pszEscapedLayerXML,
osSRSTag.c_str(),
osSRSValue.c_str(),
osSRSTag.c_str(),
osFormat.c_str(),
(bTransparent) ? "TRUE" : "FALSE",
(osBBOXOrder.size()) ? osBBOXOrder.c_str() : "xyXY",
pszMinX, pszMaxY, pszMaxX, pszMinY,
nXSize, nYSize,
(bTransparent) ? 4 : 3,
nTileSize, nTileSize,
nOverviewCount);
CPLFree(pszEscapedURL);
CPLFree(pszEscapedLayerURL);
CPLFree(pszEscapedLayerXML);
CSLDestroy(papszTokens);
CPLDebug("WMS", "Opening WMS :\n%s", osXML.c_str());
return CPLParseXMLString(osXML);
}
