memory_datasource: support datasource interface

bindings/python/mapnik_datasource.cpp

@@ -191,7 +191,7 @@ void export_datasource()
 
     class_<memory_datasource,
            bases<datasource>, std::shared_ptr<memory_datasource>,
-           boost::noncopyable>("MemoryDatasource", init<>())
+           boost::noncopyable>("MemoryDatasource", no_init)
         .def("add_feature",&memory_datasource::push,
              "Adds a Feature:\n"
              ">>> ms = MemoryDatasource()\n"

include/mapnik/memory_datasource.hpp

@@ -36,7 +36,8 @@ class MAPNIK_DECL memory_datasource : public datasource
 {
     friend class memory_featureset;
 public:
-    memory_datasource(datasource::datasource_t type=datasource::Vector, bool bbox_check=true);
+    memory_datasource(parameters const& params);
+    static const char * name();
     virtual ~memory_datasource();
     virtual datasource::datasource_t type() const;
     virtual featureset_ptr features(query const& q) const;

src/layer.cpp

@@ -53,7 +53,7 @@ layer::layer(layer const& rhs)
       cache_features_(rhs.cache_features_),
       group_by_(rhs.group_by_),
       styles_(rhs.styles_),
-      ds_(rhs.ds_),
+      ds_(datasource_cache::instance().create(rhs.ds_->params())),
       buffer_size_(rhs.buffer_size_),
       maximum_extent_(rhs.maximum_extent_) {}
 

src/memory_datasource.cpp

@@ -26,12 +26,17 @@
 #include <mapnik/box2d.hpp>
 #include <mapnik/memory_datasource.hpp>
 #include <mapnik/memory_featureset.hpp>
-
+#include <mapnik/boolean.hpp>
 // boost
 
 // stl
 #include <algorithm>
 
+using mapnik::datasource;
+using mapnik::parameters;
+
+DATASOURCE_PLUGIN(mapnik::memory_datasource)
+
 namespace mapnik {
 
 struct accumulate_extent
@@ -60,11 +65,16 @@ struct accumulate_extent
     bool first_;
 };
 
-memory_datasource::memory_datasource(datasource::datasource_t type, bool bbox_check)
-    : datasource(parameters()),
-      desc_("in-memory datasource","utf-8"),
-      type_(type),
-      bbox_check_(bbox_check) {}
+const char * memory_datasource::name()
+{
+    return "memory";
+}
+
+memory_datasource::memory_datasource(parameters const& params)
+    : datasource(params),
+      desc_(*params.get<std::string>("type"), *params.get<std::string>("encoding","utf-8")),
+      type_(datasource::Vector),
+      bbox_check_(*params.get<boolean>("bbox_check", true)) {}
 
 memory_datasource::~memory_datasource() {}
 

tests/cpp_tests/fontset_runtime_test.cpp

@@ -1,6 +1,7 @@
 #include <boost/detail/lightweight_test.hpp>
 #include <iostream>
 #include <mapnik/memory_datasource.hpp>
+#include <mapnik/datasource_cache.hpp>
 #include <mapnik/feature.hpp>
 #include <mapnik/feature_factory.hpp>
 #include <mapnik/unicode.hpp>
@@ -47,7 +48,10 @@ int main(int argc, char** argv)
         auto pt = std::make_unique<mapnik::geometry_type>(mapnik::geometry_type::types::Point);
         pt->move_to(128,128);
         feature->add_geometry(pt.release());
-        std::shared_ptr<mapnik::memory_datasource> ds = std::make_shared<mapnik::memory_datasource>();
+
+        mapnik::parameters params;
+        params["type"]="memory";
+        auto ds = std::make_shared<mapnik::memory_datasource>(params);
         ds->push(feature);
         mapnik::Map m(256,256);
         mapnik::font_set fontset("fontset");
@@ -57,7 +61,7 @@ int main(int argc, char** argv)
         mapnik::layer lyr("layer");
         lyr.set_datasource(ds);
         lyr.add_style("style");
-        m.add_layer(lyr);
+        m.add_layer(std::move(lyr));
         mapnik::feature_type_style the_style;
         mapnik::rule r;
         mapnik::text_symbolizer text_sym;