sdext/source/pdfimport/inc/treevisitorfactory.hxx

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  31
  32 #ifndef INCLUDED_PDFI_TREEVISITORFACTORY_HXX
  33 #define INCLUDED_PDFI_TREEVISITORFACTORY_HXX
  34
  35 #include "pdfihelper.hxx"
  36 #include <boost/shared_ptr.hpp>
  37
  38 namespace pdfi
  39 {
  40     struct ElementTreeVisitor;
  41     struct EmitContext;
  42     class PDFIProcessor;
  43     class StyleContainer;
  44
  45     /** Tree manipulation factory
  46
  47         Creates visitor objects performing various operations on the
  48         pdf parse tree
  49      */
  50     struct TreeVisitorFactory
  51     {
  52         virtual ~TreeVisitorFactory() {}
  53
  54         /// Create visitor that combines tree nodes
  55         virtual boost::shared_ptr<ElementTreeVisitor> createOptimizingVisitor(PDFIProcessor&) const = 0;
  56         /// Create visitor that prepares style info
  57         virtual boost::shared_ptr<ElementTreeVisitor> createStyleCollectingVisitor(
  58             StyleContainer&, PDFIProcessor&) const = 0;
  59         /// Create visitor that emits tree to an output target
  60         virtual boost::shared_ptr<ElementTreeVisitor> createEmittingVisitor(EmitContext&) const = 0;
  61     };
  62
  63     typedef boost::shared_ptr<TreeVisitorFactory> TreeVisitorFactorySharedPtr;
  64
  65     TreeVisitorFactorySharedPtr createWriterTreeVisitorFactory();
  66     TreeVisitorFactorySharedPtr createImpressTreeVisitorFactory();
  67     TreeVisitorFactorySharedPtr createDrawTreeVisitorFactory();
  68 }
  69
  70 #endif
  71