include/geos/geom/util/LinearComponentExtracter.h

   1 /**********************************************************************
   2  *
   3  * GEOS - Geometry Engine Open Source
   4  * http://geos.osgeo.org
   5  *
   6  * Copyright (C) 2001-2002 Vivid Solutions Inc.
   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_GEOM_UTIL_LINEARCOMPONENTEXTRACTER_H
  17 #define GEOS_GEOM_UTIL_LINEARCOMPONENTEXTRACTER_H
  18
  19
  20 #include <geos/export.h>
  21 #include <vector>
  22
  23 #include <geos/geom/GeometryComponentFilter.h>
  24 #include <geos/geom/Geometry.h> // to be removed when we have the .inl
  25 #include <geos/geom/LineString.h> // to be removed when we have the .inl
  26 //#include <geos/platform.h>
  27
  28 namespace geos {
  29 namespace geom { // geos.geom
  30 namespace util { // geos.geom.util
  31
  32 /**
  33  * Extracts all the 1-dimensional (LineString) components from a Geometry.
  34  */
  35 class GEOS_DLL LinearComponentExtracter: public GeometryComponentFilter {
  36
  37 private:
  38
  39         LineString::ConstVect &comps;
  40
  41     // Declare type as noncopyable
  42     LinearComponentExtracter(const LinearComponentExtracter& other);
  43     LinearComponentExtracter& operator=(const LinearComponentExtracter& rhs);
  44
  45 public:
  46         /**
  47          * Push the linear components from a single geometry into
  48          * the provided vector.
  49          * If more than one geometry is to be processed, it is more
  50          * efficient to create a single LinearComponentExtracterFilter instance
  51          * and pass it to multiple geometries.
  52          */
  53         static void getLines(const Geometry &geom, std::vector<const LineString*> &ret);
  54         /**
  55          * Constructs a LinearComponentExtracterFilter with a list in which
  56          * to store LineStrings found.
  57          */
  58         LinearComponentExtracter(std::vector<const LineString*> &newComps);
  59
  60         void filter_rw(Geometry *geom);
  61
  62         void filter_ro(const Geometry *geom);
  63
  64 };
  65
  66 } // namespace geos.geom.util
  67 } // namespace geos.geom
  68 } // namespace geos
  69
  70 #endif