static void describe_datasource(Local<Object> description, mapnik::datasource_ptr ds)
{
NanScope();
try
{
// type
if (ds->type() == mapnik::datasource::Raster)
{
description->Set(NanNew("type"), NanNew<String>("raster"));
}
else
{
description->Set(NanNew("type"), NanNew<String>("vector"));
}
mapnik::layer_descriptor ld = ds->get_descriptor();
// encoding
description->Set(NanNew("encoding"), NanNew<String>(ld.get_encoding().c_str()));
// field names and types
Local<Object> fields = NanNew<Object>();
std::vector<mapnik::attribute_descriptor> const& desc = ld.get_descriptors();
std::vector<mapnik::attribute_descriptor>::const_iterator itr = desc.begin();
std::vector<mapnik::attribute_descriptor>::const_iterator end = desc.end();
while (itr != end)
{
unsigned field_type = itr->get_type();
std::string type("");
if (field_type == mapnik::Integer) type = "Number";
else if (field_type == mapnik::Float) type = "Number";
else if (field_type == mapnik::Double) type = "Number";
else if (field_type == mapnik::String) type = "String";
else if (field_type == mapnik::Boolean) type = "Boolean";
else if (field_type == mapnik::Geometry) type = "Geometry";
else if (field_type == mapnik::Object) type = "Object";
else type = "Unknown";
fields->Set(NanNew(itr->get_name().c_str()), NanNew(type.c_str()));
fields->Set(NanNew(itr->get_name().c_str()), NanNew(type.c_str()));
++itr;
}
description->Set(NanNew("fields"), fields);
Local<String> js_type = NanNew<String>("unknown");
if (ds->type() == mapnik::datasource::Raster)
{
js_type = NanNew<String>("raster");
}
else
{
boost::optional<mapnik::datasource::geometry_t> geom_type = ds->get_geometry_type();
if (geom_type)
{
mapnik::datasource::geometry_t g_type = *geom_type;
switch (g_type)
{
case mapnik::datasource::Point:
{
js_type = NanNew<String>("point");
break;
}
case mapnik::datasource::LineString:
{
js_type = NanNew<String>("linestring");
break;
}
case mapnik::datasource::Polygon:
{
js_type = NanNew<String>("polygon");
break;
}
case mapnik::datasource::Collection:
{
js_type = NanNew<String>("collection");
break;
}
default:
{
break;
}
}
}
}
description->Set(NanNew("geometry_type"), js_type);
for (auto const& param : ld.get_extra_parameters())
{
node_mapnik::params_to_object(description,param.first, param.second);
}
}
catch (std::exception const& ex)
{
NanThrowError(ex.what());
}
catch (...)
{
NanThrowError("unknown exception happened when calling describe_datasource, please file bug");
}
}
static void describe_datasource(Local<Object> description, mapnik::datasource_ptr ds)
{
NanScope();
// type
if (ds->type() == mapnik::datasource::Raster)
{
description->Set(NanNew("type"), NanNew<String>("raster"));
}
else
{
description->Set(NanNew("type"), NanNew<String>("vector"));
}
mapnik::layer_descriptor ld = ds->get_descriptor();
// encoding
description->Set(NanNew("encoding"), NanNew<String>(ld.get_encoding().c_str()));
// field names and types
Local<Object> fields = NanNew<Object>();
node_mapnik::get_fields(fields, ds);
description->Set(NanNew("fields"), fields);
Local<String> js_type = NanNew<String>("unknown");
if (ds->type() == mapnik::datasource::Raster)
{
js_type = NanNew<String>("raster");
}
else
{
boost::optional<mapnik::datasource_geometry_t> geom_type = ds->get_geometry_type();
if (geom_type)
{
mapnik::datasource_geometry_t g_type = *geom_type;
switch (g_type)
{
case mapnik::datasource_geometry_t::Point:
{
js_type = NanNew<String>("point");
break;
}
case mapnik::datasource_geometry_t::LineString:
{
js_type = NanNew<String>("linestring");
break;
}
case mapnik::datasource_geometry_t::Polygon:
{
js_type = NanNew<String>("polygon");
break;
}
case mapnik::datasource_geometry_t::Collection:
{
js_type = NanNew<String>("collection");
break;
}
default:
{
break;
}
}
}
}
description->Set(NanNew("geometry_type"), js_type);
for (auto const& param : ld.get_extra_parameters())
{
node_mapnik::params_to_object(description,param.first, param.second);
}
}