preserve old MemoryDatasource interface in Python

bindings/python/mapnik/__init__.py

@@ -627,6 +627,16 @@ def Python(**keywords):
     keywords['type'] = 'python'
     return CreateDatasource(keywords)
 
+def MemoryDatasource(**keywords):
+    """Create a Memory Datasource.
+
+    Optional keyword arguments:
+        (TODO)
+    """
+    params = Parameters()
+    params.append(Parameter('type','memory'))
+    return MemoryDatasourceBase(params)
+
 class PythonDatasource(object):
     """A base class for a Python data source.
 

bindings/python/mapnik/printing.py

@@ -17,7 +17,7 @@ see the documentation of mapnik.printing.PDFPrinter() for options
 """
 from __future__ import absolute_import
 
-from . import render, Map, Box2d, MemoryDatasource, Layer, Feature, Projection, ProjTransform, Coord, Style, Rule, Geometry2d
+from . import render, Map, Box2d, Layer, Feature, Projection, ProjTransform, Coord, Style, Rule, Geometry2d
 import math
 import os
 import tempfile
@@ -306,12 +306,12 @@ class PDFPrinter:
     """Main class for creating PDF print outs, basically contruct an instance
     with appropriate options and then call render_map with your mapnik map
     """
-    def __init__(self, 
+    def __init__(self,
-                 pagesize=pagesizes["a4"], 
+                 pagesize=pagesizes["a4"],
-                 margin=0.005, 
+                 margin=0.005,
                  box=None,
                  percent_box=None,
-                 scale=default_scale, 
+                 scale=default_scale,
                  resolution=resolutions.dpi72,
                  preserve_aspect=True,
                  centering=centering.constrained,
@@ -321,7 +321,7 @@ class PDFPrinter:
 
         pagesize: tuple of page size in meters, see predefined sizes in pagessizes dict (default a4)
         margin: page margin in meters (default 0.01)
-        box: box within the page to render the map into (will not render over margin). This should be 
+        box: box within the page to render the map into (will not render over margin). This should be
              a Mapnik Box2d object. Default is the full page within the margin
         percent_box: as per box, but specified as a percent (0->1) of the full page size. If both box
                      and percent_box are specified percent_box will be used.
@@ -485,7 +485,7 @@ class PDFPrinter:
 
     def _get_context(self):
         if HAS_PANGOCAIRO_MODULE:
-            return 
+            return
         elif HAS_PYCAIRO_MODULE:
             return cairo.Context(self._s)
         return None
@@ -779,7 +779,7 @@ class PDFPrinter:
             prev = value
             value+=page_div_size
             fill = [1-z for z in fill]
-            label_value += div_size 
+            label_value += div_size
             if self._is_latlon and label_value > 180:
                 label_value -= 360
             text = "%d" % label_value
@@ -1025,4 +1025,3 @@ class PDFPrinter:
                         if y > h:
                             h = y
         return (w,h)
-

bindings/python/mapnik_datasource.cpp

@@ -41,6 +41,7 @@ using mapnik::datasource;
 using mapnik::memory_datasource;
 using mapnik::layer_descriptor;
 using mapnik::attribute_descriptor;
+using mapnik::parameters;
 
 namespace
 {
@@ -191,7 +192,7 @@ void export_datasource()
 
     class_<memory_datasource,
            bases<datasource>, std::shared_ptr<memory_datasource>,
-           boost::noncopyable>("MemoryDatasource", no_init)
+           boost::noncopyable>("MemoryDatasourceBase", init<parameters>())
         .def("add_feature",&memory_datasource::push,
              "Adds a Feature:\n"
              ">>> ms = MemoryDatasource()\n"

tests/cpp_tests/fontset_runtime_test.cpp

@@ -61,7 +61,7 @@ int main(int argc, char** argv)
         mapnik::layer lyr("layer");
         lyr.set_datasource(ds);
         lyr.add_style("style");
-        m.add_layer(std::move(lyr));
+        m.add_layer(lyr);
         mapnik::feature_type_style the_style;
         mapnik::rule r;
         mapnik::text_symbolizer text_sym;