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278 lines (232 sloc) 9.393 kb
//#include <mapnik/datasource_cache.hpp>
#include <mapnik/memory_datasource.hpp>
#include <mapnik/unicode.hpp>
#include "mapnik_memory_datasource.hpp"
#include "mapnik_datasource.hpp"
#include "mapnik_featureset.hpp"
#include "utils.hpp"
#include "ds_emitter.hpp"
// stl
#include <exception>
Persistent<FunctionTemplate> MemoryDatasource::constructor;
void MemoryDatasource::Initialize(Handle<Object> target) {
HandleScope scope;
constructor = Persistent<FunctionTemplate>::New(FunctionTemplate::New(MemoryDatasource::New));
constructor->InstanceTemplate()->SetInternalFieldCount(1);
constructor->SetClassName(String::NewSymbol("MemoryDatasource"));
// methods
NODE_SET_PROTOTYPE_METHOD(constructor, "parameters", parameters);
NODE_SET_PROTOTYPE_METHOD(constructor, "describe", describe);
NODE_SET_PROTOTYPE_METHOD(constructor, "features", features);
NODE_SET_PROTOTYPE_METHOD(constructor, "featureset", featureset);
NODE_SET_PROTOTYPE_METHOD(constructor, "add", add);
target->Set(String::NewSymbol("MemoryDatasource"),constructor->GetFunction());
}
MemoryDatasource::MemoryDatasource() :
ObjectWrap(),
datasource_(),
feature_id_(1),
tr_(new mapnik::transcoder("utf8")) {}
MemoryDatasource::~MemoryDatasource()
{
}
Handle<Value> MemoryDatasource::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();
MemoryDatasource* d = static_cast<MemoryDatasource*>(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++;
}
//memory_datasource cache;
mapnik::datasource_ptr ds(new mapnik::memory_datasource());
MemoryDatasource* d = new MemoryDatasource();
d->Wrap(args.This());
d->datasource_ = ds;
return args.This();
return Undefined();
}
Handle<Value> MemoryDatasource::New(mapnik::datasource_ptr ds_ptr) {
HandleScope scope;
MemoryDatasource* d = new MemoryDatasource();
d->datasource_ = ds_ptr;
Handle<Value> ext = External::New(d);
Handle<Object> obj = constructor->GetFunction()->NewInstance(1, &ext);
return scope.Close(obj);
}
Handle<Value> MemoryDatasource::parameters(const Arguments& args)
{
HandleScope scope;
MemoryDatasource* d = ObjectWrap::Unwrap<MemoryDatasource>(args.This());
Local<Object> ds = Object::New();
if (d->datasource_) {
mapnik::parameters::const_iterator it = d->datasource_->params().begin();
mapnik::parameters::const_iterator end = d->datasource_->params().end();
for (; it != end; ++it)
{
params_to_object serializer( ds , it->first);
boost::apply_visitor( serializer, it->second );
}
}
return scope.Close(ds);
}
Handle<Value> MemoryDatasource::describe(const Arguments& args)
{
HandleScope scope;
MemoryDatasource* d = ObjectWrap::Unwrap<MemoryDatasource>(args.This());
Local<Object> description = Object::New();
if (d->datasource_) {
try {
describe_datasource(description,d->datasource_);
}
catch (const mapnik::datasource_exception & ex )
{
return ThrowException(Exception::Error(
String::New(ex.what())));
}
}
return scope.Close(description);
}
Handle<Value> MemoryDatasource::features(const Arguments& args)
{
HandleScope scope;
unsigned first = 0;
unsigned last = 0;
// we are slicing
if (args.Length() == 2)
{
if (!args[0]->IsNumber() || !args[1]->IsNumber())
return ThrowException(Exception::Error(
String::New("Index of 'first' and 'last' feature must be an integer")));
first = args[0]->IntegerValue();
last = args[1]->IntegerValue();
}
MemoryDatasource* d = ObjectWrap::Unwrap<MemoryDatasource>(args.This());
// TODO - we don't know features.length at this point
Local<Array> a = Array::New(0);
if (d->datasource_) {
datasource_features(a,d->datasource_,first,last);
}
return scope.Close(a);
}
Handle<Value> MemoryDatasource::featureset(const Arguments& args)
{
HandleScope scope;
MemoryDatasource* d = ObjectWrap::Unwrap<MemoryDatasource>(args.This());
if (d->datasource_) {
mapnik::query q(d->datasource_->envelope());
mapnik::layer_descriptor ld = d->datasource_->get_descriptor();
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)
{
q.add_property_name(itr->get_name());
++itr;
}
mapnik::featureset_ptr fs = d->datasource_->features(q);
if (fs)
{
return scope.Close(Featureset::New(fs));
}
}
return Undefined();
}
Handle<Value> MemoryDatasource::add(const Arguments& args)
{
HandleScope scope;
if ((args.Length() != 1) || !args[0]->IsObject())
{
return ThrowException(Exception::Error(
String::New("accepts one argument: an object including x and y (or wkt) and properties")));
}
MemoryDatasource* d = ObjectWrap::Unwrap<MemoryDatasource>(args.This());
Local<Object> obj = args[0]->ToObject();
if (obj->Has(String::New("wkt")) || (obj->Has(String::New("x")) && obj->Has(String::New("y"))))
{
if (obj->Has(String::New("wkt")))
return ThrowException(Exception::Error(
String::New("wkt not yet supported")));
Local<Value> x = obj->Get(String::New("x"));
Local<Value> y = obj->Get(String::New("y"));
if (!x->IsUndefined() && x->IsNumber() && !y->IsUndefined() && y->IsNumber())
{
mapnik::geometry_type * pt = new mapnik::geometry_type(mapnik::Point);
pt->move_to(x->NumberValue(),y->NumberValue());
mapnik::feature_ptr feature(new mapnik::Feature(d->feature_id_));
++(d->feature_id_);
feature->add_geometry(pt);
if (obj->Has(String::New("properties")))
{
Local<Value> props = obj->Get(String::New("properties"));
if (props->IsObject())
{
Local<Object> p_obj = props->ToObject();
Local<Array> names = p_obj->GetPropertyNames();
uint32_t i = 0;
uint32_t a_length = names->Length();
while (i < a_length)
{
Local<Value> name = names->Get(i)->ToString();
// if name in q.property_names() ?
Local<Value> value = p_obj->Get(name);
if (value->IsString()) {
UnicodeString ustr = d->tr_->transcode(TOSTR(value));
boost::put(*feature,TOSTR(name),ustr);
} else if (value->IsNumber()) {
double num = value->NumberValue();
// todo - round
if (num == value->IntegerValue()) {
int integer = value->IntegerValue();
boost::put(*feature,TOSTR(name),integer);
} else {
double dub_val = value->NumberValue();
boost::put(*feature,TOSTR(name),dub_val);
}
} else {
std::clog << "unhandled type for property: " << TOSTR(name) << "\n";
}
i++;
}
}
}
mapnik::memory_datasource *cache = dynamic_cast<mapnik::memory_datasource *>(d->datasource_.get());
cache->push(feature);
}
}
return scope.Close(Boolean::New(false));
}
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