FeatureCursor* createFeatureCursor( const Symbology::Query& query )
{
FeatureCursor* result = 0L;
std::string url = createURL( query );
// check the blacklist:
if ( Registry::instance()->isBlacklisted(url) )
return 0L;
OE_DEBUG << LC << url << std::endl;
URI uri(url);
// read the data:
ReadResult r = uri.readString( _dbOptions.get() );
const std::string& buffer = r.getString();
const Config& meta = r.metadata();
bool dataOK = false;
FeatureList features;
if ( !buffer.empty() )
{
// Get the mime-type from the metadata record if possible
const std::string& mimeType = r.metadata().value( IOMetadata::CONTENT_TYPE );
dataOK = getFeatures( buffer, mimeType, features );
}
if ( dataOK )
{
OE_DEBUG << LC << "Read " << features.size() << " features" << std::endl;
}
//If we have any filters, process them here before the cursor is created
if (!_options.filters().empty())
{
// preprocess the features using the filter list:
if ( features.size() > 0 )
{
FilterContext cx;
cx.setProfile( getFeatureProfile() );
for( FeatureFilterList::const_iterator i = _options.filters().begin(); i != _options.filters().end(); ++i )
{
FeatureFilter* filter = i->get();
cx = filter->push( features, cx );
}
}
}
//result = new FeatureListCursor(features);
result = dataOK ? new FeatureListCursor( features ) : 0L;
if ( !result )
Registry::instance()->blacklist( url );
return result;
}
// reads a chunk of features into a memory cache; do this for performance
// and to avoid needing the OGR Mutex every time
void
FeatureCursorOGR::readChunk()
{
if ( !_resultSetHandle )
return;
OGR_SCOPED_LOCK;
while( _queue.size() < _chunkSize && !_resultSetEndReached )
{
FeatureList filterList;
while( filterList.size() < _chunkSize && !_resultSetEndReached )
{
OGRFeatureH handle = OGR_L_GetNextFeature( _resultSetHandle );
if ( handle )
{
osg::ref_ptr<Feature> feature = OgrUtils::createFeature( handle, _profile.get() );
if (feature.valid() &&
!_source->isBlacklisted( feature->getFID() ) &&
validateGeometry( feature->getGeometry() ))
{
filterList.push_back( feature.release() );
}
OGR_F_Destroy( handle );
}
else
{
_resultSetEndReached = true;
}
}
// preprocess the features using the filter list:
if ( !_filters.empty() )
{
FilterContext cx;
cx.setProfile( _profile.get() );
if (_query.bounds().isSet())
{
cx.extent() = GeoExtent(_profile->getSRS(), _query.bounds().get());
}
else
{
cx.extent() = _profile->getExtent();
}
for( FeatureFilterList::const_iterator i = _filters.begin(); i != _filters.end(); ++i )
{
FeatureFilter* filter = i->get();
cx = filter->push( filterList, cx );
}
}
for(FeatureList::const_iterator i = filterList.begin(); i != filterList.end(); ++i)
{
_queue.push( i->get() );
}
}
}
void FeatureCursorCDBV::Read_Data_Directly(void)
{
FeatureList preProcessList;
OGR_SCOPED_LOCK;
OGR_L_ResetReading(_layerHandle);
OGRFeatureH feat_handle;
OGRLayer * thislayer = (OGRLayer *)_layerHandle;
int totalCount = thislayer->GetFeatureCount();
int fcount = -1;
while ((feat_handle = OGR_L_GetNextFeature(_layerHandle)) != NULL)
{
++fcount;
if (feat_handle)
{
osg::ref_ptr<Feature> f = OgrUtils::createFeature(feat_handle, _profile.get());
if (f.valid() && !_source->isBlacklisted(f->getFID()))
{
if (isGeometryValid(f->getGeometry()))
{
_queue.push(f);
if (_filters.size() > 0)
{
preProcessList.push_back(f.release());
}
}
else
{
OE_DEBUG << LC << "Skipping feature with invalid geometry: " << f->getGeoJSON() << std::endl;
}
}
OGR_F_Destroy(feat_handle);
}
}
// preprocess the features using the filter list:
if (preProcessList.size() > 0)
{
FilterContext cx;
cx.setProfile(_profile.get());
for (FeatureFilterList::const_iterator i = _filters.begin(); i != _filters.end(); ++i)
{
FeatureFilter* filter = i->get();
cx = filter->push(preProcessList, cx);
}
}
}
// reads a chunk of features into a memory cache; do this for performance
// and to avoid needing the OGR Mutex every time
void
FeatureCursorCDBV::readChunk()
{
if ( !_resultSetHandle )
return;
FeatureList preProcessList;
OGR_SCOPED_LOCK;
if ( _nextHandleToQueue )
{
osg::ref_ptr<Feature> f = OgrUtils::createFeature( _nextHandleToQueue, _profile.get() );
if ( f.valid() && !_source->isBlacklisted(f->getFID()) )
{
f->setFID(_s_CDBV_FeatureID);
++_s_CDBV_FeatureID;
if ( isGeometryValid( f->getGeometry() ) )
{
_queue.push( f );
if ( _filters.size() > 0 )
{
preProcessList.push_back( f.release() );
}
}
else
{
OE_DEBUG << LC << "Skipping feature with invalid geometry: " << f->getGeoJSON() << std::endl;
}
}
OGR_F_Destroy( _nextHandleToQueue );
_nextHandleToQueue = 0L;
}
unsigned handlesToQueue = _chunkSize - _queue.size();
bool resultSetEndReached = false;
for( unsigned i=0; i<handlesToQueue; i++ )
{
OGRFeatureH handle = OGR_L_GetNextFeature( _resultSetHandle );
if ( handle )
{
osg::ref_ptr<Feature> f = OgrUtils::createFeature( handle, _profile.get() );
if ( f.valid() && !_source->isBlacklisted(f->getFID()) )
{
f->setFID(_s_CDBV_FeatureID);
++_s_CDBV_FeatureID;
if (isGeometryValid( f->getGeometry() ) )
{
_queue.push( f );
if ( _filters.size() > 0 )
{
preProcessList.push_back( f.release() );
}
}
else
{
OE_DEBUG << LC << "Skipping feature with invalid geometry: " << f->getGeoJSON() << std::endl;
}
}
OGR_F_Destroy( handle );
}
else
{
resultSetEndReached = true;
break;
}
}
// preprocess the features using the filter list:
if ( preProcessList.size() > 0 )
{
FilterContext cx;
cx.setProfile( _profile.get() );
for( FeatureFilterList::const_iterator i = _filters.begin(); i != _filters.end(); ++i )
{
FeatureFilter* filter = i->get();
cx = filter->push( preProcessList, cx );
}
}
// read one more for "more" detection:
if (!resultSetEndReached)
_nextHandleToQueue = OGR_L_GetNextFeature( _resultSetHandle );
else
_nextHandleToQueue = 0L;
//OE_NOTICE << "read " << _queue.size() << " features ... " << std::endl;
}
// reads a chunk of features into a memory cache; do this for performance
// and to avoid needing the OGR Mutex every time
void
FeatureCursorOGR::readChunk()
{
if ( !_resultSetHandle )
return;
FeatureList preProcessList;
OGR_SCOPED_LOCK;
if ( _nextHandleToQueue )
{
Feature* f = createFeature( _nextHandleToQueue );
if ( f )
{
_queue.push( f );
if ( _filters.size() > 0 )
preProcessList.push_back( f );
}
OGR_F_Destroy( _nextHandleToQueue );
_nextHandleToQueue = 0L;
}
int handlesToQueue = _chunkSize - _queue.size();
for( int i=0; i<handlesToQueue; i++ )
{
OGRFeatureH handle = OGR_L_GetNextFeature( _resultSetHandle );
if ( handle )
{
Feature* f = createFeature( handle );
if ( f )
{
_queue.push( f );
if ( _filters.size() > 0 )
preProcessList.push_back( f );
}
OGR_F_Destroy( handle );
}
else
break;
}
// preprocess the features using the filter list:
if ( preProcessList.size() > 0 )
{
FilterContext cx;
cx.profile() = _profile.get();
for( FeatureFilterList::const_iterator i = _filters.begin(); i != _filters.end(); ++i )
{
FeatureFilter* filter = i->get();
cx = filter->push( preProcessList, cx );
}
}
// read one more for "more" detection:
_nextHandleToQueue = OGR_L_GetNextFeature( _resultSetHandle );
//OE_NOTICE << "read " << _queue.size() << " features ... " << std::endl;
}
FeatureCursor* createFeatureCursor(const Symbology::Query& query, ProgressCallback* progress)
{
FeatureCursor* result = 0L;
std::string url = createURL( query );
// the URL wil lbe empty if it was invalid or outside the level bounds of the layer.
if (url.empty())
return 0L;
OE_DEBUG << LC << url << std::endl;
URI uri(url, _options.url()->context());
// read the data:
ReadResult r = uri.readString(_readOptions.get(), progress);
const std::string& buffer = r.getString();
const Config& meta = r.metadata();
bool dataOK = false;
FeatureList features;
if ( !buffer.empty() )
{
// Get the mime-type from the metadata record if possible
std::string mimeType = r.metadata().value( IOMetadata::CONTENT_TYPE );
//If the mimetype is empty then try to set it from the format specification
if (mimeType.empty())
{
if (_options.format().value() == "json") mimeType = "json";
else if (_options.format().value().compare("gml") == 0) mimeType = "text/xml";
else if (_options.format().value().compare("pbf") == 0) mimeType = "application/x-protobuf";
}
dataOK = getFeatures( buffer, *query.tileKey(), mimeType, features );
}
if ( dataOK )
{
OE_DEBUG << LC << "Read " << features.size() << " features" << std::endl;
}
//If we have any filters, process them here before the cursor is created
if (getFilters() && !getFilters()->empty() && !features.empty())
{
FilterContext cx;
cx.setProfile(getFeatureProfile());
cx.extent() = query.tileKey()->getExtent();
for (FeatureFilterChain::const_iterator i = getFilters()->begin(); i != getFilters()->end(); ++i)
{
FeatureFilter* filter = i->get();
cx = filter->push(features, cx);
}
}
// If we have any features and we have an fid attribute, override the fid of the features
if (_options.fidAttribute().isSet())
{
for (FeatureList::iterator itr = features.begin(); itr != features.end(); ++itr)
{
std::string attr = itr->get()->getString(_options.fidAttribute().get());
FeatureID fid = as<long>(attr, 0);
itr->get()->setFID( fid );
}
}
result = new FeatureListCursor(features);
return result;
}