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#include <mbgl/style/expression/expression.hpp>
#include <mbgl/tile/geometry_tile_data.hpp>
namespace mbgl {
namespace style {
namespace expression {
class GeoJSONFeature : public GeometryTileFeature {
public:
const Feature& feature;
GeoJSONFeature(const Feature& feature_)
: feature(feature_) {
}
FeatureType getType() const override {
return apply_visitor(ToFeatureType(), feature.geometry);
}
PropertyMap getProperties() const override {
return feature.properties;
}
optional<FeatureIdentifier> getID() const override {
return feature.id;
}
GeometryCollection getGeometries() const override {
return {};
}
optional<Value> getValue(const std::string& key) const override {
auto it = feature.properties.find(key);
if (it != feature.properties.end()) {
return optional<Value>(it->second);
}
return optional<Value>();
}
};
optional<OutputValue> Expression::evaluate(float z, const Feature& feature, EvaluationError& error) const {
std::unique_ptr<const GeometryTileFeature> f = std::make_unique<const GeoJSONFeature>(feature);
return this->evaluate(z, *f, error);
}
} // namespace expression
} // namespace style
} // namespace mbgl
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