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use geo_types::{
Geometry, GeometryCollection, LineString, MultiLineString, MultiPoint, MultiPolygon, Point,
Polygon,
};
use postgis::ewkb::{GeometryCollectionT, GeometryT};
#[cfg_attr(docsrs, doc(cfg(feature = "postgis")))]
pub trait FromPostgis<T> {
fn from_postgis(_: T) -> Self;
}
impl<'a, T> FromPostgis<&'a T> for Point<f64>
where
T: postgis::Point,
{
fn from_postgis(pt: &'a T) -> Self {
Point::new(pt.x(), pt.y())
}
}
impl<'a, T> FromPostgis<&'a T> for LineString<f64>
where
T: postgis::LineString<'a>,
{
fn from_postgis(ls: &'a T) -> Self {
let ret: Vec<Point<f64>> = ls.points().map(|x| Point::from_postgis(x)).collect();
LineString::from(ret)
}
}
impl<'a, T> FromPostgis<&'a T> for Option<Polygon<f64>>
where
T: postgis::Polygon<'a>,
{
fn from_postgis(poly: &'a T) -> Self {
let mut rings = poly
.rings()
.map(|x| LineString::from_postgis(x))
.collect::<Vec<_>>();
if rings.is_empty() {
return None;
}
let exterior = rings.remove(0);
Some(Polygon::new(exterior, rings))
}
}
impl<'a, T> FromPostgis<&'a T> for MultiPoint<f64>
where
T: postgis::MultiPoint<'a>,
{
fn from_postgis(mp: &'a T) -> Self {
let ret = mp.points().map(|x| Point::from_postgis(x)).collect();
MultiPoint(ret)
}
}
impl<'a, T> FromPostgis<&'a T> for MultiLineString<f64>
where
T: postgis::MultiLineString<'a>,
{
fn from_postgis(mp: &'a T) -> Self {
let ret = mp.lines().map(|x| LineString::from_postgis(x)).collect();
MultiLineString(ret)
}
}
impl<'a, T> FromPostgis<&'a T> for MultiPolygon<f64>
where
T: postgis::MultiPolygon<'a>,
{
fn from_postgis(mp: &'a T) -> Self {
let ret = mp.polygons().filter_map(Option::from_postgis).collect();
MultiPolygon(ret)
}
}
impl<'a, T> FromPostgis<&'a GeometryCollectionT<T>> for GeometryCollection<f64>
where
T: postgis::Point + postgis::ewkb::EwkbRead,
{
fn from_postgis(gc: &'a GeometryCollectionT<T>) -> Self {
let geoms = gc
.geometries
.iter()
.filter_map(Option::from_postgis)
.collect();
GeometryCollection(geoms)
}
}
impl<'a, T> FromPostgis<&'a GeometryT<T>> for Option<Geometry<f64>>
where
T: postgis::Point + postgis::ewkb::EwkbRead,
{
fn from_postgis(geo: &'a GeometryT<T>) -> Self {
Some(match *geo {
GeometryT::Point(ref p) => Geometry::Point(Point::from_postgis(p)),
GeometryT::LineString(ref ls) => Geometry::LineString(LineString::from_postgis(ls)),
GeometryT::Polygon(ref p) => match Option::from_postgis(p) {
Some(p) => Geometry::Polygon(p),
None => return None,
},
GeometryT::MultiPoint(ref p) => Geometry::MultiPoint(MultiPoint::from_postgis(p)),
GeometryT::MultiLineString(ref p) => {
Geometry::MultiLineString(MultiLineString::from_postgis(p))
}
GeometryT::MultiPolygon(ref p) => Geometry::MultiPolygon(MultiPolygon::from_postgis(p)),
GeometryT::GeometryCollection(ref p) => {
Geometry::GeometryCollection(GeometryCollection::from_postgis(p))
}
})
}
}