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* external functions may expect arguments with a type different from boost::filesystem::path so they are only provided raw string values
* moved xalan string conversion logic into separate compilation unit
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* order of items in a directory was varying across platforms which hindered testability
* they are now temporarily copied into a std::vector instance and then sorted using std::sort
* updated "read_directory" test case reference file accordingly
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* ... as a test of how well we are able to test DOM structures
* required change of constructDocument visibility
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* this change makes the underlying similarity between all currently implemented external functions obvious
* they more or less only differ in their document construction logic
** i.e. there is a possibility for a second layer of abstraction between the classes derived from xalan::Function and the actual functionality
* added boost::filesystem::path taking overload of the _iterate_ member method to FilesystemGuard
** this overload functions as the _master_ overload that is called by all other overloads which merely perform type conversion and path resolution
** this overload doesn't perform path resolution
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* all instantiations of a FilesystemContext are currently based on information provided by a xalan::Locator instance provided to the external function execute member method
* this change hides the stylesheet path extraction from the actual function implementation
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* it was moved into functions local to the respective compilation unit to improve readability
** splits DOM tree construction logic from the actual purpose of the external function
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* throwing std::out_of_range exception from DomDocumentCache::get instead of returning nullptr in case of a problem
* moved xalanToString method back into FilesystemContext compilation unit as is only needed there
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* A call to _read-file_ now returns a _content_ and _status_ node
** this enables XSL transformations to easily react to io related errors
* fixed bug in path resolution
** boost::filesystem _canonical_ method is throwing and exception when the given path does not exist, this pulled down the whole stack
** replaced call to _canonical_ with call to _absolute_ which does not have this requirement
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* the plan to return XML-nodes from each external function requires a better way to manage the lifetime of many xerces DOM document instances and their support class instances
** this is why DomDocumentCache and DomDocumentCache::item were implemented
** based on std::map so we can easily access the result of old function calls
* changed external read-directory function to return the children of the document node instead of the document node itself
** removes unnecessary cruft in function calls
** will make returning status codes alongside the function result more pleasing to the eye
* updated test transformation to reflect new features
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* they are marked appropriately by a _type_ attribute
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* _read-directory_ lists all files in a given directory
** currently text-only output, xml planned
* improved FilesystemContext path resolution (relative path is fully resolved by boost::filesystem)
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* this class provides methods for resolving paths relative to the contained base path
* other filesystem interaction methods will also be implemented in this class
** for instance directory traversal
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