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geojson.input: minor code adjustments

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- Avoids making copy of inline string to save memory
 - Moves duplicated code out of #ifdef to be more readible
This commit is contained in:
Dane Springmeyer 2016-09-02 15:51:58 -07:00
parent fa44f0e247
commit acd90042fb
2 changed files with 11 additions and 22 deletions
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31
plugins/input/geojson/geojson_datasource.cpp
View file

@ -113,18 +113,14 @@ geojson_datasource::geojson_datasource(parameters const& params)
desc_(geojson_datasource::name(),
*params.get<std::string>("encoding","utf-8")),
filename_(),
inline_string_(),
from_inline_string_(false),
extent_(),
features_(),
tree_(nullptr),
num_features_to_query_(*params.get<mapnik::value_integer>("num_features_to_query",5))
{
boost::optional<std::string> inline_string = params.get<std::string>("inline");
if (inline_string)
{
inline_string_ = *inline_string;
}
else
if (!inline_string)
{
boost::optional<std::string> file = params.get<std::string>("file");
if (!file) throw mapnik::datasource_exception("GeoJSON Plugin: missing <file> parameter");
@ -137,10 +133,11 @@ geojson_datasource::geojson_datasource(parameters const& params)
has_disk_index_ = mapnik::util::exists(filename_ + ".index");
}
if (!inline_string_.empty())
if (inline_string)
{
char const* start = inline_string_.c_str();
char const* end = start + inline_string_.size();
from_inline_string_ = true;
char const* start = inline_string->c_str();
char const* end = start + inline_string->size();
parse_geojson(start, end);
}
else if (has_disk_index_)
@ -162,14 +159,6 @@ geojson_datasource::geojson_datasource(parameters const& params)
std::fread(&file_buffer[0], file.size(), 1, file.get());
char const* start = file_buffer.c_str();
char const* end = start + file_buffer.length();
if (cache_features_)
{
parse_geojson(start, end);
}
else
{
initialise_index(start, end);
}
#else
boost::optional<mapnik::mapped_region_ptr> mapped_region =
mapnik::mapped_memory_cache::instance().find(filename_, false);
@ -180,6 +169,7 @@ geojson_datasource::geojson_datasource(parameters const& params)
char const* start = reinterpret_cast<char const*>((*mapped_region)->get_address());
char const* end = start + (*mapped_region)->get_size();
#endif
if (cache_features_)
{
parse_geojson(start, end);
@ -188,7 +178,6 @@ geojson_datasource::geojson_datasource(parameters const& params)
{
initialise_index(start, end);
}
#endif
}
}
@ -276,7 +265,7 @@ void geojson_datasource::initialise_index(Iterator start, Iterator end)
space);
if (!result || itr != end)
{
if (!inline_string_.empty()) throw mapnik::datasource_exception("geojson_datasource: Failed to parse GeoJSON file from in-memory string");
if (from_inline_string_) throw mapnik::datasource_exception("geojson_datasource: Failed to parse GeoJSON file from in-memory string");
else throw mapnik::datasource_exception("geojson_datasource: Failed to parse GeoJSON file '" + filename_ + "'");
}
@ -368,7 +357,7 @@ void geojson_datasource::parse_geojson(Iterator start, Iterator end)
space);
if (!result || itr != end)
{
if (!inline_string_.empty()) throw mapnik::datasource_exception("geojson_datasource: Failed parse GeoJSON file from in-memory string");
if (from_inline_string_) throw mapnik::datasource_exception("geojson_datasource: Failed parse GeoJSON file from in-memory string");
else throw mapnik::datasource_exception("geojson_datasource: Failed parse GeoJSON file '" + filename_ + "'");
}
}
@ -382,7 +371,7 @@ void geojson_datasource::parse_geojson(Iterator start, Iterator end)
space);
if (!result || itr != end)
{
if (!inline_string_.empty()) throw mapnik::datasource_exception("geojson_datasource: Failed parse GeoJSON file from in-memory string");
if (from_inline_string_) throw mapnik::datasource_exception("geojson_datasource: Failed parse GeoJSON file from in-memory string");
else throw mapnik::datasource_exception("geojson_datasource: Failed parse GeoJSON file '" + filename_ + "'");
}
}

2
plugins/input/geojson/geojson_datasource.hpp
View file

@ -98,7 +98,7 @@ private:
mapnik::datasource::datasource_t type_;
mapnik::layer_descriptor desc_;
std::string filename_;
std::string inline_string_;
bool from_inline_string_;
mapnik::box2d<double> extent_;
std::vector<mapnik::feature_ptr> features_;
std::unique_ptr<spatial_index_type> tree_;