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The overall process is controlled by org.apache.fop.apps.Driver.
This class handles the FO Tree building, renderers, output and logging.
The process in general is that the FO document is sent to the tree
builder via SAX events. This creates an FO Tree. The FO Tree is then
handled by the layout processor which converts the FO Tree into an area
tree. This area tree is then given to the renderer and the renderer converts
the area tree into a stream of data containing the output document.
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The class org.apache.fop.fo.FOTreeBuilder is responsible for
actually constructing the FO tree. The key SAX events used are
startElement() ,
endElement() and characters() .
All formatting objects derive from abstract class
org.apache.fop.fo.FONode. The other FO classes inherit from
FONode as follows:
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This is a separate process. The render() method in
Driver is invoked (say,
by CommandLine) with the laid-out AreaTree and a
PrintWriter as arguments.
This actually calls the render() method in a specific implementation of
the Renderer interface, typically PDFRenderer or
AWTRenderer.
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