sdext/source/pdfimport/inc/treevisitorfactory.hxx

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  19
  20 #ifndef INCLUDED_SDEXT_SOURCE_PDFIMPORT_INC_TREEVISITORFACTORY_HXX
  21 #define INCLUDED_SDEXT_SOURCE_PDFIMPORT_INC_TREEVISITORFACTORY_HXX
  22
  23 #include "pdfihelper.hxx"
  24 #include <boost/shared_ptr.hpp>
  25
  26 namespace pdfi
  27 {
  28     struct ElementTreeVisitor;
  29     struct EmitContext;
  30     class PDFIProcessor;
  31     class StyleContainer;
  32
  33     /** Tree manipulation factory
  34
  35         Creates visitor objects performing various operations on the
  36         pdf parse tree
  37      */
  38     struct TreeVisitorFactory
  39     {
  40         virtual ~TreeVisitorFactory() {}
  41
  42         /// Create visitor that combines tree nodes
  43         virtual boost::shared_ptr<ElementTreeVisitor> createOptimizingVisitor(PDFIProcessor&) const = 0;
  44         /// Create visitor that prepares style info
  45         virtual boost::shared_ptr<ElementTreeVisitor> createStyleCollectingVisitor(
  46             StyleContainer&, PDFIProcessor&) const = 0;
  47         /// Create visitor that emits tree to an output target
  48         virtual boost::shared_ptr<ElementTreeVisitor> createEmittingVisitor(EmitContext&) const = 0;
  49     };
  50
  51     typedef boost::shared_ptr<TreeVisitorFactory> TreeVisitorFactorySharedPtr;
  52
  53     TreeVisitorFactorySharedPtr createWriterTreeVisitorFactory();
  54     TreeVisitorFactorySharedPtr createImpressTreeVisitorFactory();
  55     TreeVisitorFactorySharedPtr createDrawTreeVisitorFactory();
  56 }
  57
  58 #endif
  59
  60 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */