Handle<Value> Datasource::New(const Arguments& args)
{
HandleScope scope;
if (!args.IsConstructCall())
return ThrowException(String::New("Cannot call constructor as function, you need to use 'new' keyword"));
if (args[0]->IsExternal())
{
//std::clog << "external!\n";
Local<External> ext = Local<External>::Cast(args[0]);
void* ptr = ext->Value();
Datasource* d = static_cast<Datasource*>(ptr);
d->Wrap(args.This());
return args.This();
}
if (!args.Length() == 1){
return ThrowException(Exception::TypeError(
String::New("accepts only one argument, an object of key:value datasource options")));
}
if (!args[0]->IsObject())
return ThrowException(Exception::TypeError(
String::New("must provide an object, eg {type: 'shape', file : 'world.shp'}")));
Local<Object> options = args[0]->ToObject();
// TODO - maybe validate in js?
bool bind=true;
if (options->Has(String::New("bind")))
{
Local<Value> bind_opt = options->Get(String::New("bind"));
if (!bind_opt->IsBoolean())
return ThrowException(Exception::TypeError(
String::New("'bind' must be a Boolean")));
bind = bind_opt->BooleanValue();
}
mapnik::parameters params;
Local<Array> names = options->GetPropertyNames();
uint32_t i = 0;
uint32_t a_length = names->Length();
while (i < a_length) {
Local<Value> name = names->Get(i)->ToString();
Local<Value> value = options->Get(name);
params[TOSTR(name)] = TOSTR(value);
i++;
}
mapnik::datasource_ptr ds;
try
{
ds = mapnik::datasource_cache::create(params, bind);
}
catch (const mapnik::config_error & ex )
{
return ThrowException(Exception::Error(
String::New(ex.what())));
}
catch (const mapnik::datasource_exception & ex )
{
return ThrowException(Exception::Error(
String::New(ex.what())));
}
catch (const std::runtime_error & ex )
{
return ThrowException(Exception::Error(
String::New(ex.what())));
}
catch (const std::exception & ex)
{
return ThrowException(Exception::Error(
String::New(ex.what())));
}
catch (...)
{
return ThrowException(Exception::Error(
String::New("unknown exception happened, please file bug")));
}
if (ds)
{
Datasource* d = new Datasource();
d->Wrap(args.This());
d->datasource_ = ds;
return args.This();
}
return Undefined();
}
Handle<Value> Datasource::New(const Arguments& args)
{
HandleScope scope;
if (!args.IsConstructCall())
return ThrowException(String::New("Cannot call constructor as function, you need to use 'new' keyword"));
if (args[0]->IsExternal())
{
//std::clog << "external!\n";
Local<External> ext = Local<External>::Cast(args[0]);
void* ptr = ext->Value();
Datasource* d = static_cast<Datasource*>(ptr);
if (d->datasource_->type() == mapnik::datasource::Raster)
{
args.This()->Set(String::NewSymbol("type"),
String::NewSymbol("raster"),
static_cast<v8::PropertyAttribute>(v8::ReadOnly|v8::DontDelete));
}
else
{
args.This()->Set(String::NewSymbol("type"),
String::NewSymbol("vector"),
static_cast<v8::PropertyAttribute>(v8::ReadOnly|v8::DontDelete));
}
d->Wrap(args.This());
return args.This();
}
if (args.Length() != 1){
return ThrowException(Exception::TypeError(
String::New("accepts only one argument, an object of key:value datasource options")));
}
if (!args[0]->IsObject())
return ThrowException(Exception::TypeError(
String::New("Must provide an object, eg {type: 'shape', file : 'world.shp'}")));
Local<Object> options = args[0]->ToObject();
mapnik::parameters params;
Local<Array> names = options->GetPropertyNames();
unsigned int i = 0;
unsigned int a_length = names->Length();
while (i < a_length) {
Local<Value> name = names->Get(i)->ToString();
Local<Value> value = options->Get(name);
// TODO - don't treat everything as strings
params[TOSTR(name)] = TOSTR(value);
i++;
}
mapnik::datasource_ptr ds;
try
{
#if MAPNIK_VERSION >= 200200
ds = mapnik::datasource_cache::instance().create(params);
#else
ds = mapnik::datasource_cache::instance()->create(params);
#endif
}
catch (std::exception const& ex)
{
return ThrowException(Exception::Error(
String::New(ex.what())));
}
if (ds)
{
if (ds->type() == mapnik::datasource::Raster)
{
args.This()->Set(String::NewSymbol("type"),
String::NewSymbol("raster"),
static_cast<v8::PropertyAttribute>(v8::ReadOnly|v8::DontDelete));
}
else
{
args.This()->Set(String::NewSymbol("type"),
String::NewSymbol("vector"),
static_cast<v8::PropertyAttribute>(v8::ReadOnly|v8::DontDelete));
}
Datasource* d = new Datasource();
d->Wrap(args.This());
d->datasource_ = ds;
return args.This();
}
return Undefined();
}