return actual features

plugins/input/geobuf/geobuf_datasource.cpp

@@ -52,18 +52,56 @@ using mapnik::parameters;
 
 DATASOURCE_PLUGIN(geobuf_datasource)
 
+struct attr_value_converter
+{
+    mapnik::eAttributeType operator() (mapnik::value_integer) const
+    {
+        return mapnik::Integer;
+    }
+
+    mapnik::eAttributeType operator() (double) const
+    {
+        return mapnik::Double;
+    }
+
+    mapnik::eAttributeType operator() (float) const
+    {
+        return mapnik::Double;
+    }
+
+    mapnik::eAttributeType operator() (bool) const
+    {
+        return mapnik::Boolean;
+    }
+
+    mapnik::eAttributeType operator() (std::string const& ) const
+    {
+        return mapnik::String;
+    }
+
+    mapnik::eAttributeType operator() (mapnik::value_unicode_string const&) const
+    {
+        return mapnik::String;
+    }
+
+    mapnik::eAttributeType operator() (mapnik::value_null const& ) const
+    {
+        return mapnik::String;
+    }
+};
+
 geobuf_datasource::geobuf_datasource(parameters const& params)
-  : datasource(params),
-    type_(datasource::Vector),
-    desc_(geobuf_datasource::name(),
-          *params.get<std::string>("encoding","utf-8")),
-    filename_(),
-    extent_(),
-    features_(),
-    tree_(nullptr)
+    : datasource(params),
+      type_(datasource::Vector),
+      desc_(geobuf_datasource::name(),
+            *params.get<std::string>("encoding","utf-8")),
+      filename_(),
+      extent_(),
+      features_(),
+      tree_(nullptr)
 {
     boost::optional<std::string> file = params.get<std::string>("file");
-    if (!file) throw mapnik::datasource_exception("GeoJSON Plugin: missing <file> parameter");
+    if (!file) throw mapnik::datasource_exception("Geobuf Plugin: missing <file> parameter");
 
     boost::optional<std::string> base = params.get<std::string>("base");
     if (base)
@@ -88,6 +126,47 @@ void geobuf_datasource::parse_geobuf(std::uint8_t const* data, std::size_t size)
     mapnik::util::geobuf buf(data, size);
     buf.read(features_);
     std::cerr << "Num of features  = " << features_.size() << std::endl;
+#if BOOST_VERSION >= 105600
+    using values_container = std::vector< std::pair<box_type, std::pair<std::size_t, std::size_t>>>;
+    values_container values;
+    values.reserve(features_.size());
+#else
+    tree_ = std::make_unique<spatial_index_type>(16, 4);
+#endif
+
+    std::size_t geometry_index = 0;
+    for (mapnik::feature_ptr const& f : features_)
+    {
+        mapnik::box2d<double> box = f->envelope();
+        if (box.valid())
+        {
+            if (geometry_index == 0)
+            {
+                extent_ = box;
+                for ( auto const& kv : *f)
+                {
+                    desc_.add_descriptor(mapnik::attribute_descriptor(std::get<0>(kv),
+                                                                      mapnik::util::apply_visitor(attr_value_converter(),
+                                                                                                  std::get<1>(kv))));
+                }
+            }
+            else
+            {
+                extent_.expand_to_include(box);
+            }
+        }
+#if BOOST_VERSION >= 105600
+        values.emplace_back(box, std::make_pair(geometry_index,0));
+#else
+        tree_->insert(box, std::make_pair(geometry_index));
+#endif
+        ++geometry_index;
+    }
+
+#if BOOST_VERSION >= 105600
+    // packing algorithm
+    tree_ = std::make_unique<spatial_index_type>(values);
+#endif
 }
 
 geobuf_datasource::~geobuf_datasource() {}
@@ -136,6 +215,24 @@ mapnik::layer_descriptor geobuf_datasource::get_descriptor() const
 
 mapnik::featureset_ptr geobuf_datasource::features(mapnik::query const& q) const
 {
+    // if the query box intersects our world extent then query for features
+    mapnik::box2d<double> const& box = q.get_bbox();
+    if (extent_.intersects(box))
+    {
+#if BOOST_VERSION >= 105600
+        geobuf_featureset::array_type index_array;
+        if (tree_)
+        {
+            tree_->query(boost::geometry::index::intersects(box),std::back_inserter(index_array));
+            return std::make_shared<geobuf_featureset>(features_, std::move(index_array));
+        }
+    }
+#else
+    if (tree_)
+    {
+        return std::make_shared<geobuf_featureset>(features_, tree_->find(box));
+    }
+#endif
     return mapnik::featureset_ptr();
 }
 

plugins/input/geobuf/geobuf_featureset.cpp

@@ -30,8 +30,9 @@
 
 #include "geobuf_featureset.hpp"
 
-geobuf_featureset::geobuf_featureset(array_type && index_array)
-    : index_array_(std::move(index_array)),
+geobuf_featureset::geobuf_featureset(std::vector<mapnik::feature_ptr> const& features,array_type && index_array)
+    : features_(features),
+      index_array_(std::move(index_array)),
       index_itr_(index_array_.begin()),
       index_end_(index_array_.end()),
       ctx_(std::make_shared<mapnik::context_type>()) {}
@@ -44,12 +45,16 @@ mapnik::feature_ptr geobuf_featureset::next()
     {
 #if BOOST_VERSION >= 105600
         geobuf_datasource::item_type const& item = *index_itr_++;
-        std::size_t file_offset = item.second.first;
-        std::size_t size = item.second.second;
+        std::size_t index = item.second.first;
+        //std::size_t size = item.second.second;
         //std::cerr << file_offset << " (" << size << ") " << item.first << std::endl;
 #else
         std::size_t index = *index_itr_++;
 #endif
+        if ( index < features_.size())
+        {
+            return features_.at(index);
+        }
     }
     return mapnik::feature_ptr();
 }

plugins/input/geobuf/geobuf_featureset.hpp

@@ -34,11 +34,13 @@ class geobuf_featureset : public mapnik::Featureset
 {
 public:
     typedef std::deque<geobuf_datasource::item_type> array_type;
-    geobuf_featureset(array_type && index_array);
+    geobuf_featureset(std::vector<mapnik::feature_ptr> const& features,
+                      array_type && index_array);
     virtual ~geobuf_featureset();
     mapnik::feature_ptr next();
 
 private:
+    std::vector<mapnik::feature_ptr> const& features_;
     const array_type index_array_;
     array_type::const_iterator index_itr_;
     array_type::const_iterator index_end_;