summaryrefslogtreecommitdiff
path: root/src/mbgl/style/sources/geojson_source.cpp
blob: 5523336f12786bc764c8660c003b7305a188934e (plain)
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
#include <mbgl/storage/file_source.hpp>
#include <mbgl/style/conversion/geojson.hpp>
#include <mbgl/style/conversion/json.hpp>
#include <mbgl/style/layer.hpp>
#include <mbgl/style/source_observer.hpp>
#include <mbgl/style/sources/geojson_source.hpp>
#include <mbgl/style/sources/geojson_source_impl.hpp>
#include <mbgl/tile/tile.hpp>
#include <mbgl/util/logging.hpp>
#include <mbgl/util/thread_pool.hpp>

namespace mbgl {
namespace style {

GeoJSONSource::GeoJSONSource(const std::string& id, optional<GeoJSONOptions> options)
    : Source(makeMutable<Impl>(id, options)) {}

GeoJSONSource::~GeoJSONSource() = default;

const GeoJSONSource::Impl& GeoJSONSource::impl() const {
    return static_cast<const Impl&>(*baseImpl);
}

void GeoJSONSource::setURL(const std::string& url_) {
    url = url_;

    // Signal that the source description needs a reload
    if (loaded || req) {
        loaded = false;
        req.reset();
        observer->onSourceDescriptionChanged(*this);
    }
}

void GeoJSONSource::setGeoJSON(const mapbox::geojson::geojson& geoJSON) {
    setGeoJSONData(GeoJSONData::create(geoJSON, impl().getOptions()));
}

void GeoJSONSource::setGeoJSONData(std::shared_ptr<GeoJSONData> geoJSONData) {
    req.reset();
    baseImpl = makeMutable<Impl>(impl(), std::move(geoJSONData));
    observer->onSourceChanged(*this);
}

optional<std::string> GeoJSONSource::getURL() const {
    return url;
}

const GeoJSONOptions& GeoJSONSource::getOptions() const {
    return impl().getOptions();
}

void GeoJSONSource::loadDescription(FileSource& fileSource) {
    if (!url) {
        loaded = true;
        return;
    }

    if (req) {
        return;
    }

    req = fileSource.request(Resource::source(*url), [this](Response res) {
        if (res.error) {
            observer->onSourceError(
                *this, std::make_exception_ptr(std::runtime_error(res.error->message)));
        } else if (res.notModified) {
            return;
        } else if (res.noContent) {
            observer->onSourceError(
                *this, std::make_exception_ptr(std::runtime_error("unexpectedly empty GeoJSON")));
        } else {
            auto makeImplInBackground = [currentImpl = baseImpl, data = res.data]() -> Immutable<Source::Impl> {
                assert(data);
                auto& impl = static_cast<const Impl&>(*currentImpl);
                conversion::Error error;
                std::shared_ptr<GeoJSONData> geoJSONData;
                if (optional<GeoJSON> geoJSON = conversion::convertJSON<GeoJSON>(*data, error)) {
                    geoJSONData = GeoJSONData::create(*geoJSON, impl.getOptions());
                } else {
                    // Create an empty GeoJSON VT object to make sure we're not infinitely waiting for tiles to load.
                    Log::Error(Event::ParseStyle, "Failed to parse GeoJSON data: %s", error.message.c_str());
                }
                return makeMutable<Impl>(impl, std::move(geoJSONData));
            };
            auto onImplReady = [this, self = makeWeakPtr(), capturedReq = req.get()](Immutable<Source::Impl> newImpl) {
                assert(capturedReq);
                if (!self) return;                    // This source has been deleted.
                if (capturedReq != req.get()) return; // A new request is being processed, ignore this impl.

                baseImpl = std::move(newImpl);
                loaded = true;
                observer->onSourceLoaded(*this);
            };
            Scheduler::GetBackground()->scheduleAndReplyValue(makeImplInBackground, onImplReady);
        }
    });
}

bool GeoJSONSource::supportsLayerType(const mbgl::style::LayerTypeInfo* info) const {
    return mbgl::underlying_type(Tile::Kind::Geometry) == mbgl::underlying_type(info->tileKind);
}

} // namespace style
} // namespace mbgl