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Progress on generating tilestats as JSON

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This commit is contained in:
Eric Fischer 2017-07-18 13:27:37 -07:00
parent 71f57793fd
commit 3eb1237b0a
1 changed files with 86 additions and 0 deletions

86
mbtiles.cpp

@ -131,9 +131,95 @@ bool type_and_string::operator<(const type_and_string &o) const {
return false;
}
std::string tilestats(std::map<std::string, layermap_entry> const &layermap) {
std::string out = "{\n";
out.append("\t\"layerCount\": ");
out.append(std::to_string(layermap.size()));
out.append(",\n");
out.append("\t\"layers\": [\n");
bool first = true;
for (auto layer : layermap) {
if (!first) {
out.append(",\n");
}
first = false;
out.append("\t\t{\n");
out.append("\t\t\t\"layer\": \"");
quote(&out, layer.first.c_str());
out.append("\",\n");
out.append("\t\t\t\"count\": ");
out.append(std::to_string(layer.second.points + layer.second.lines + layer.second.polygons));
out.append(",\n");
std::string geomtype = "Polygon";
if (layer.second.points >= layer.second.lines && layer.second.points >= layer.second.polygons) {
geomtype = "Point";
} else if (layer.second.lines >= layer.second.polygons && layer.second.lines >= layer.second.points) {
geomtype = "LineString";
}
out.append("\t\t\t\"geometry\": \"");
quote(&out, geomtype.c_str());
out.append("\",\n");
size_t attrib_count = layer.second.file_keys.size();
if (attrib_count > 1000) {
attrib_count = 1000;
}
out.append("\t\t\t\"attributeCount\": ");
out.append(std::to_string(attrib_count));
out.append(",\n");
out.append("\t\t\t\"attributes\": [\n");
size_t attrs = 0;
for (auto attribute : layer.second.file_keys) {
if (attrs != 0) {
out.append(",\n");
}
attrs++;
out.append("\t\t\t\t{\n");
out.append("\t\t\t\t\t\"attribute\": \"");
quote(&out, attribute.first.c_str());
out.append("\",\n");
size_t val_count = attribute.second.sample_values.size();
if (val_count > 1000) {
val_count = 1000;
}
out.append("\t\t\t\t\t\"count\": ");
out.append(std::to_string(val_count));
out.append(",\n");
out.append("\t\t\t\t}");
}
out.append("\n\t\t\t]\n");
out.append("\t\t}");
}
out.append("\n");
out.append("\t]\n");
out.append("}");
return out;
}
void mbtiles_write_metadata(sqlite3 *outdb, const char *outdir, const char *fname, int minzoom, int maxzoom, double minlat, double minlon, double maxlat, double maxlon, double midlat, double midlon, int forcetable, const char *attribution, std::map<std::string, layermap_entry> const &layermap, bool vector, const char *description) {
char *sql, *err;
printf("%s\n", tilestats(layermap).c_str());
sqlite3 *db = outdb;
if (outdb == NULL) {
if (sqlite3_open("", &db) != SQLITE_OK) {