include/geos/operation/union/GeometryListHolder.h

   1 /**********************************************************************
   2  *
   3  * GEOS - Geometry Engine Open Source
   4  * http://geos.osgeo.org
   5  *
   6  * Copyright (C) 2011 Sandro Santilli <strk@keybit.net>
   7  * Copyright (C) 2006 Refractions Research Inc.
   8  *
   9  * This is free software; you can redistribute and/or modify it under
  10  * the terms of the GNU Lesser General Public Licence as published
  11  * by the Free Software Foundation.
  12  * See the COPYING file for more information.
  13  *
  14  **********************************************************************/
  15
  16 #ifndef GEOS_OP_UNION_GEOMETRYLISTHOLDER_H
  17 #define GEOS_OP_UNION_GEOMETRYLISTHOLDER_H
  18
  19 // Forward declarations
  20 namespace geos {
  21   namespace geom {
  22     class Geometry;
  23         }
  24 }
  25
  26 namespace geos {
  27 namespace operation { // geos::operation
  28 namespace geounion {  // geos::operation::geounion
  29
  30 /**
  31  * \brief Helper class holding Geometries, part of which are held by reference
  32  *        others are held exclusively.
  33  */
  34 class GeometryListHolder : public std::vector<geom::Geometry*>
  35 {
  36 private:
  37     typedef std::vector<geom::Geometry*> base_type;
  38
  39 public:
  40     GeometryListHolder() {}
  41     ~GeometryListHolder()
  42     {
  43         std::for_each(ownedItems.begin(), ownedItems.end(),
  44             &GeometryListHolder::deleteItem);
  45     }
  46
  47     // items need to be deleted in the end
  48     void push_back_owned(geom::Geometry* item)
  49     {
  50         this->base_type::push_back(item);
  51         ownedItems.push_back(item);
  52     }
  53
  54     geom::Geometry* getGeometry(std::size_t index)
  55     {
  56       if (index >= this->base_type::size())
  57           return NULL;
  58       return (*this)[index];
  59     }
  60
  61 private:
  62     static void deleteItem(geom::Geometry* item);
  63
  64 private:
  65     std::vector<geom::Geometry*> ownedItems;
  66 };
  67
  68 } // namespace geos::operation::union
  69 } // namespace geos::operation
  70 } // namespace geos
  71
  72 #endif