fast_mvt/reader/
layer.rs

1use std::fmt;
2use std::num::NonZeroU32;
3
4use super::feature::MvtFeatureRef;
5use super::property::{MvtValueRef, value_ref};
6use crate::generated::vector_tile::tile as proto_tile;
7use crate::{DEFAULT_EXTENT, MvtError, MvtLayer, MvtResult};
8
9#[derive(Copy, Clone)]
10pub struct MvtLayerRef<'a>(&'a proto_tile::LayerView<'a>);
11
12impl<'a> MvtLayerRef<'a> {
13    pub(crate) fn new(view: &'a proto_tile::LayerView<'a>) -> Self {
14        Self(view)
15    }
16
17    #[must_use]
18    pub fn name(self) -> &'a str {
19        self.0.name
20    }
21
22    #[must_use]
23    pub fn version(self) -> u32 {
24        self.0.version
25    }
26
27    #[must_use]
28    pub fn extent(self) -> u32 {
29        self.0.extent.unwrap_or(DEFAULT_EXTENT.get())
30    }
31
32    #[must_use]
33    pub fn feature_count(self) -> usize {
34        self.0.features.len()
35    }
36
37    #[must_use]
38    pub fn is_empty(self) -> bool {
39        self.0.features.is_empty()
40    }
41
42    #[must_use]
43    pub fn keys(self) -> &'a [&'a str] {
44        &self.0.keys
45    }
46
47    #[must_use]
48    pub fn values(self) -> impl ExactSizeIterator<Item = MvtValueRef<'a>> {
49        self.0.values.iter().map(value_ref)
50    }
51
52    #[must_use]
53    pub fn features(self) -> impl ExactSizeIterator<Item = MvtFeatureRef<'a>> {
54        self.0
55            .features
56            .iter()
57            .map(move |feature| MvtFeatureRef::new(self.0, feature))
58    }
59
60    pub fn to_layer(self) -> MvtResult<MvtLayer> {
61        let extent = match self.0.extent {
62            Some(extent) => NonZeroU32::new(extent).ok_or(MvtError::InvalidExtent)?,
63            None => DEFAULT_EXTENT,
64        };
65        self.features()
66            .map(MvtFeatureRef::to_feature)
67            .collect::<MvtResult<Vec<_>>>()
68            .map(|features| MvtLayer {
69                name: self.0.name.to_string(),
70                extent,
71                features,
72            })
73    }
74}
75
76impl fmt::Debug for MvtLayerRef<'_> {
77    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
78        writeln!(f, "  name: {}", self.name())?;
79        writeln!(f, "  version: {}", self.version())?;
80        writeln!(f, "  extent: {}", self.extent())?;
81        for (index, feature) in self.features().enumerate() {
82            writeln!(f, "  feature: {index}")?;
83            // Each feature's `Debug` block is already newline-terminated.
84            write!(f, "{feature:?}")?;
85        }
86        Ok(())
87    }
88}
fast_mvt/reader/layer.rs

fast_mvt/reader/
layer.rs
