1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173

use std::fmt::Debug;
use std::io::Cursor;

use byteorder::{BigEndian, LittleEndian, ReadBytesExt, WriteBytesExt};
use diesel::{
    deserialize::{self, FromSql},
    pg::{self, Pg},
    serialize::{self, IsNull, Output, ToSql},
};

use crate::{
    ewkb::{read_ewkb_header, write_ewkb_header, EwkbSerializable, GeometryType, BIG_ENDIAN},
    types::{PointT, Polygon},
};

use crate::points::{read_point_coordinates, write_point_coordinates, Dimension};
use crate::sql_types::*;

impl<T> Polygon<T>
where
    T: PointT + Clone,
{
    pub fn new(srid: Option<u32>) -> Self {
        Self::with_capacity(srid, 0)
    }

    pub fn with_capacity(srid: Option<u32>, cap: usize) -> Self {
        Polygon {
            rings: Vec::with_capacity(cap),
            srid,
        }
    }

    pub fn add_ring<'a>(&'a mut self) -> &mut Self {
        self.add_ring_with_capacity(0)
    }

    pub fn add_ring_with_capacity<'a>(&'a mut self, cap: usize) -> &mut Self {
        self.rings.push(Vec::with_capacity(cap));
        self
    }

    pub fn add_point<'a>(&'a mut self, point: T) -> &mut Self {
        if self.rings.last().is_none() {
            self.add_ring();
        }
        self.rings.last_mut().unwrap().push(point);
        self
    }

    pub fn add_points<'a>(&'a mut self, points: impl IntoIterator<Item = T>) -> &mut Self {
        if self.rings.last().is_none() {
            self.add_ring();
        }
        let last = self.rings.last_mut().unwrap();
        for point in points {
            last.push(point);
        }
        self
    }

    pub fn dimension(&self) -> u32 {
        let mut dimension = Dimension::None as u32;
        if let Some(ring) = self.rings.first() {
            if let Some(point) = ring.first() {
                dimension |= point.dimension();
            }
        }
        dimension
    }
}

impl<T> EwkbSerializable for Polygon<T>
where
    T: PointT + Clone,
{
    fn geometry_type(&self) -> u32 {
        GeometryType::Polygon as u32 | self.dimension()
    }
}

impl<T> ToSql<Geometry, Pg> for Polygon<T>
where
    T: PointT + Debug + PartialEq + Clone + EwkbSerializable,
{
    fn to_sql(&self, out: &mut Output<Pg>) -> serialize::Result {
        write_polygon(self, self.srid, out)
    }
}

impl<T> ToSql<Geography, Pg> for Polygon<T>
where
    T: PointT + Debug + PartialEq + Clone + EwkbSerializable,
{
    fn to_sql(&self, out: &mut Output<Pg>) -> serialize::Result {
        write_polygon(self, self.srid, out)
    }
}

pub fn write_polygon<T>(
    polygon: &Polygon<T>,
    srid: Option<u32>,
    out: &mut Output<Pg>,
) -> serialize::Result
where
    T: PointT + EwkbSerializable + Clone,
{
    write_ewkb_header(polygon, srid, out)?;
    // number of rings
    out.write_u32::<LittleEndian>(polygon.rings.len() as u32)?;
    for ring in polygon.rings.iter() {
        //number of points in ring
        out.write_u32::<LittleEndian>(ring.len() as u32)?;
        for point in ring.iter() {
            write_point_coordinates(point, out)?;
        }
    }
    Ok(IsNull::No)
}

impl<T> FromSql<Geometry, Pg> for Polygon<T>
where
    T: PointT + Debug + Clone,
{
    fn from_sql(bytes: pg::PgValue) -> deserialize::Result<Self> {
        let mut r = Cursor::new(bytes.as_bytes());
        let end = r.read_u8()?;
        if end == BIG_ENDIAN {
            read_polygon::<BigEndian, T>(&mut r)
        } else {
            read_polygon::<LittleEndian, T>(&mut r)
        }
    }
}

impl<T> FromSql<Geography, Pg> for Polygon<T>
where
    T: PointT + Debug + Clone,
{
    fn from_sql(bytes: pg::PgValue) -> deserialize::Result<Self> {
        FromSql::<Geometry, Pg>::from_sql(bytes)
    }
}

fn read_polygon<T, P>(cursor: &mut Cursor<&[u8]>) -> deserialize::Result<Polygon<P>>
where
    T: byteorder::ByteOrder,
    P: PointT + Clone,
{
    let g_header = read_ewkb_header::<T>(cursor)?.expect(GeometryType::Polygon)?;
    read_polygon_body::<T, P>(g_header.g_type, g_header.srid, cursor)
}

pub fn read_polygon_body<T, P>(
    g_type: u32,
    srid: Option<u32>,
    cursor: &mut Cursor<&[u8]>,
) -> deserialize::Result<Polygon<P>>
where
    T: byteorder::ByteOrder,
    P: PointT + Clone,
{
    let rings_n = cursor.read_u32::<T>()?;
    let mut polygon = Polygon::with_capacity(srid, rings_n as usize);
    for _i in 0..rings_n {
        let points_n = cursor.read_u32::<T>()?;
        polygon.add_ring_with_capacity(points_n as usize);
        for _p in 0..points_n {
            polygon.add_point(read_point_coordinates::<T, P>(cursor, g_type, srid)?);
        }
    }
    Ok(polygon)
}