void
FeatureSource::applyFilters(FeatureList& features, const GeoExtent& extent) const
{
// apply filters before returning.
if (_filters.valid() && _filters->empty() == false)
{
FilterContext cx;
cx.setProfile( getFeatureProfile() );
cx.extent() = extent;
for(FeatureFilterChain::const_iterator filter = _filters->begin(); filter != _filters->end(); ++filter)
{
cx = filter->get()->push( features, cx );
}
}
}
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;
}
