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;
}
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;
}
int OGRESRIFeatureServiceLayer::TestCapability( const char* pszCap )
{
if( EQUAL(pszCap, OLCFastFeatureCount) )
return m_poAttrQuery == NULL && m_poFilterGeom == NULL;
if( EQUAL(pszCap, OLCFastGetExtent) )
return FALSE;
return poDS->GetUnderlyingLayer()->TestCapability(pszCap);
}
void OGRESRIFeatureServiceLayer::ResetReading()
{
poDS->ResetReading();
nFeaturesRead = 0;
nLastFID = 0;
bOtherPage = FALSE;
bUseSequentialFID = FALSE;
}
OGRFeature* OGRESRIFeatureServiceLayer::GetNextFeature()
{
while( TRUE )
{
int bWasInFirstPage = !bOtherPage;
OGRFeature* poSrcFeat = poDS->GetUnderlyingLayer()->GetNextFeature();
if( poSrcFeat == NULL )
{
if( !poDS->LoadNextPage() )
return NULL;
poSrcFeat = poDS->GetUnderlyingLayer()->GetNextFeature();
if( poSrcFeat == NULL )
return NULL;
bOtherPage = TRUE;
}
if( bOtherPage && bWasInFirstPage && poSrcFeat->GetFID() == 0 &&
nLastFID == nFeaturesRead - 1 )
{
bUseSequentialFID = TRUE;
}
OGRFeature* poFeature = new OGRFeature(poFeatureDefn);
poFeature->SetFrom(poSrcFeat);
if( bUseSequentialFID )
poFeature->SetFID(nFeaturesRead);
else
poFeature->SetFID(poSrcFeat->GetFID());
nLastFID = poFeature->GetFID();
nFeaturesRead ++;
delete poSrcFeat;
if((m_poFilterGeom == NULL
|| FilterGeometry( poFeature->GetGeometryRef() ) )
&& (m_poAttrQuery == NULL
|| m_poAttrQuery->Evaluate( poFeature )) )
{
return poFeature;
}
delete poFeature;
}
}