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
174
175
use std::fmt::Debug;
use std::io::Cursor;

use crate::{
    ewkb::{read_ewkb_header, write_ewkb_header, EwkbSerializable, GeometryType, BIG_ENDIAN},
    points::Dimension,
    polygon::{read_polygon_body, write_polygon},
    types::*,
};
use byteorder::{BigEndian, LittleEndian, ReadBytesExt, WriteBytesExt};
use diesel::{
    deserialize::{self, FromSql},
    pg::{self, Pg},
    serialize::{self, IsNull, Output, ToSql},
};

use crate::sql_types::*;

impl<T> MultiPolygon<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 {
        MultiPolygon {
            polygons: Vec::with_capacity(cap),
            srid,
        }
    }

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

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

    pub fn add_point<'a>(&'a mut self, point: T) -> &mut Self {
        if self.polygons.is_empty() {
            self.add_empty_polygon();
        }
        self.polygons.last_mut().unwrap().add_point(point);
        self
    }

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

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

impl<T> EwkbSerializable for MultiPolygon<T>
where
    T: PointT + Clone,
{
    fn geometry_type(&self) -> u32 {
        let mut g_type = GeometryType::MultiPolygon as u32;
        if let Some(polygon) = self.polygons.first() {
            g_type |= polygon.dimension();
        }
        g_type
    }
}

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

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

impl<T> FromSql<Geometry, Pg> for MultiPolygon<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_multi_polygon::<BigEndian, T>(&mut r)
        } else {
            read_multi_polygon::<LittleEndian, T>(&mut r)
        }
    }
}
impl<T> FromSql<Geography, Pg> for MultiPolygon<T>
where
    T: PointT + Debug + Clone,
{
    fn from_sql(bytes: pg::PgValue) -> deserialize::Result<Self> {
        FromSql::<Geometry, Pg>::from_sql(bytes)
    }
}

pub fn write_multi_polygon<T>(
    multipolygon: &MultiPolygon<T>,
    srid: Option<u32>,
    out: &mut Output<Pg>,
) -> serialize::Result
where
    T: PointT + EwkbSerializable + Clone,
{
    write_ewkb_header(multipolygon, srid, out)?;
    // number of polygons
    out.write_u32::<LittleEndian>(multipolygon.polygons.len() as u32)?;
    for polygon in multipolygon.polygons.iter() {
        write_polygon(polygon, None, out)?;
    }
    Ok(IsNull::No)
}

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

pub fn read_multi_polygon_body<T, P>(
    g_type: u32,
    srid: Option<u32>,
    cursor: &mut Cursor<&[u8]>,
) -> deserialize::Result<MultiPolygon<P>>
where
    T: byteorder::ByteOrder,
    P: PointT + Clone,
{
    let polygons_n = cursor.read_u32::<T>()?;
    let mut polygon = MultiPolygon::with_capacity(srid, polygons_n as usize);

    for _i in 0..polygons_n {
        // skip 1 byte for byte order and 4 bytes for point type
        cursor.read_u8()?;
        cursor.read_u32::<T>()?;
        polygon
            .polygons
            .push(read_polygon_body::<T, P>(g_type, srid, cursor)?);
    }
    Ok(polygon)
}