egml_io/geometry/
linear_ring.rs

1use std::hash::{DefaultHasher, Hash, Hasher};
2
3use crate::error::Error;
4use crate::error::Error::{MissingElements, Only3DSupported};
5use egml_core::model::base::{AbstractGml, Id};
6use egml_core::model::geometry::{DirectPosition, LinearRing};
7use serde::{Deserialize, Serialize};
8
9#[derive(Debug, Serialize, Deserialize, PartialEq, Eq, Hash, Clone)]
10#[serde(rename = "gml:exterior")]
11pub struct GmlLinearRing {
12    #[serde(rename = "@id", default)]
13    pub id: String,
14
15    #[serde(rename = "$value")]
16    pub pos_list: Option<GmlPosList>,
17}
18
19#[derive(Debug, Serialize, Deserialize, PartialEq, Eq, Hash, Clone)]
20#[serde(rename = "gml:posList")]
21pub struct GmlPosList {
22    #[serde(rename = "@srsDimension")]
23    srs_dimension: Option<u32>,
24    #[serde(rename = "$value")]
25    value: String,
26}
27
28impl TryFrom<GmlPosList> for Vec<DirectPosition> {
29    type Error = Error;
30
31    fn try_from(value: GmlPosList) -> Result<Self, Self::Error> {
32        if value.srs_dimension.unwrap_or(3) != 3 {
33            return Err(Only3DSupported());
34        }
35
36        let parsed_values: Vec<f64> = value
37            .value
38            .split_whitespace()
39            .map(|s| s.parse().unwrap())
40            .collect();
41        if !parsed_values.len().is_multiple_of(3) {
42            return Err(MissingElements());
43        }
44
45        let mut points: Vec<DirectPosition> = Vec::new();
46        for chunk in parsed_values.chunks(3) {
47            let point = DirectPosition::new(chunk[0], chunk[1], chunk[2]).unwrap();
48            points.push(point);
49        }
50
51        points.dedup();
52        if points.first().unwrap() == points.last().unwrap() {
53            points.pop();
54        }
55
56        Ok(points)
57    }
58}
59
60impl TryFrom<GmlLinearRing> for LinearRing {
61    type Error = Error;
62
63    fn try_from(value: GmlLinearRing) -> Result<Self, Self::Error> {
64        let id: Id = value.id.clone().try_into().ok().unwrap_or_else(|| {
65            let mut hasher = DefaultHasher::new();
66            value.hash(&mut hasher);
67            Id::from_hashed_u64(hasher.finish())
68        });
69        let abstract_gml = AbstractGml::new(id);
70
71        let pos_list: GmlPosList = value
72            .pos_list
73            .ok_or(Error::ElementNotFound("No element found".to_string()))
74            .unwrap();
75        let points: Vec<DirectPosition> = pos_list.try_into()?;
76
77        let linear_ring = LinearRing::new(abstract_gml, points)?;
78        Ok(linear_ring)
79    }
80}
81
82#[cfg(test)]
83mod tests {
84    use crate::{Error, GmlLinearRing};
85    use egml_core::model::geometry::LinearRing;
86    use quick_xml::de;
87
88    #[test]
89    fn parsing_linear_ring() {
90        let source_text = "<gml:LinearRing gml:id=\"4018115_LR.d2yyBHNssydL8g3B8MvW\">
91<gml:posList srsDimension=\"3\">
92678058.447 5403817.567 424.209
93678058.275 5403817.484 424.209
94678058.689 5403816.628 424.209
95678058.871 5403816.718 424.209
96678058.447 5403817.567 424.209
97</gml:posList>
98</gml:LinearRing>";
99
100        let parsed_geometry: GmlLinearRing = de::from_str(source_text).expect("");
101        let l: LinearRing = parsed_geometry.try_into().unwrap();
102    }
103
104    #[test]
105    fn parsing_linear_ring_with_duplicates() {
106        let source_text = "<gml:LinearRing gml:id=\"DEBY_LOD2_4959457_LR.EEAbfUPItTlOGZGH7VDv\">
107                      <gml:posList>691040.851 5336002.449 529.908 691040.741 5336002.172 529.908 691040.851 5336002.449 529.908 691040.851 5336002.449 529.908</gml:posList>
108                    </gml:LinearRing>";
109
110        let parsed_geometry: GmlLinearRing = de::from_str(source_text).expect("");
111        let result: Result<LinearRing, Error> = parsed_geometry.try_into();
112
113        assert!(result.is_err());
114    }
115}
egml_io/geometry/linear_ring.rs

egml_io/geometry/
linear_ring.rs
