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27 
28 #ifndef INCLUDED_PDFI_TREEVISITORFACTORY_HXX
29 #define INCLUDED_PDFI_TREEVISITORFACTORY_HXX
30 
31 #include "pdfihelper.hxx"
32 #include <boost/shared_ptr.hpp>
33 
34 namespace pdfi
35 {
36     struct ElementTreeVisitor;
37     struct EmitContext;
38     class PDFIProcessor;
39     class StyleContainer;
40 
41     /** Tree manipulation factory
42 
43         Creates visitor objects performing various operations on the
44         pdf parse tree
45      */
46     struct TreeVisitorFactory
47     {
48         virtual ~TreeVisitorFactory() {}
49 
50         /// Create visitor that combines tree nodes
51         virtual boost::shared_ptr<ElementTreeVisitor> createOptimizingVisitor(PDFIProcessor&) const = 0;
52         /// Create visitor that prepares style info
53         virtual boost::shared_ptr<ElementTreeVisitor> createStyleCollectingVisitor(
54             StyleContainer&, PDFIProcessor&) const = 0;
55         /// Create visitor that emits tree to an output target
56         virtual boost::shared_ptr<ElementTreeVisitor> createEmittingVisitor(EmitContext&, PDFIProcessor&) const = 0;
57     };
58 
59     typedef boost::shared_ptr<TreeVisitorFactory> TreeVisitorFactorySharedPtr;
60 
61     TreeVisitorFactorySharedPtr createWriterTreeVisitorFactory();
62     TreeVisitorFactorySharedPtr createImpressTreeVisitorFactory();
63     TreeVisitorFactorySharedPtr createDrawTreeVisitorFactory();
64 }
65 
66 #endif
67 
68