pal: registerFeature can return true/false to tell whether the registration was successful.

git-svn-id: http://svn.osgeo.org/qgis/branches/symbology-ng-branch@11026 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: wonder

src/core/pal/layer.cpp

@@ -305,9 +305,10 @@ namespace pal
 }
 #endif
 
-void Layer::registerFeature( const char *geom_id, PalGeometry *userGeom, double label_x, double label_y )
+bool Layer::registerFeature( const char *geom_id, PalGeometry *userGeom, double label_x, double label_y )
 {
   int j;
+  int part = 0;
 
   if ( geom_id && label_x >= 0 && label_y >= 0 )
   {
@@ -318,7 +319,7 @@ void Layer::registerFeature( const char *geom_id, PalGeometry *userGeom, double
     {
       modMutex->unlock();
       throw new PalException::FeatureExists();
-      return;
+      return false;
     }
 
     /* Split MULTI GEOM and Collection in simple geometries*/
@@ -328,7 +329,6 @@ void Layer::registerFeature( const char *geom_id, PalGeometry *userGeom, double
     LinkedList<Feat*> *finalQueue = splitGeom( the_geom, geom_id, true );
 
     int nGeom = finalQueue->size();
-    int part = 0;
 
     bool first_feat = true;
 
@@ -409,6 +409,8 @@ void Layer::registerFeature( const char *geom_id, PalGeometry *userGeom, double
     userGeom->releaseGeosGeometry( the_geom );
   }
   modMutex->unlock();
+
+  return (part > 0); // true if we've added something
 }
 
 

src/core/pal/layer.h

@@ -277,8 +277,10 @@ namespace pal
        * @param userGeom user's geometry that implements the PalGeometry interface
        *
        * @throws PalException::FeatureExists
+       *
+       * @return true on success (i.e. valid geometry)
        */
-      void registerFeature( const char *geom_id, PalGeometry *userGeom, double label_x = -1, double label_y = -1 );
+      bool registerFeature( const char *geom_id, PalGeometry *userGeom, double label_x = -1, double label_y = -1 );
 
       // TODO implement
       //void unregisterFeature (const char *geom_id);