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2014-05-13Sorting FilesystemContext iteration resultsAdrian Kummerländer
* 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
2014-05-11Switched internal DomDocumentCache structure to std::stackAdrian Kummerländer
* using std::unordered_map for named cache lookups was a nice idea but is not useful when one keeps in mind that: ** we don't want cached external function responses in a situation where we are able to execute transformations inside transformations ** cached responses mean that we can not read a xml file, overwrite it using another transformation and then read it again * the currently available InputXSLT frontend only processes a single transformation anyway, so increased memory requirements should not pose a problem ** if a future frontend should offer batch processing of transformation tasks, one could implement a cache reset method to free memory after a transformation has been processed
2014-05-10Implemented StylesheetParameterGuard classAdrian Kummerländer
* removes responsibility for clearing parameters from the generate member methods * abstracts parameter escaping and setting and handles map conversion * marked actual generate member method as private and added StylesheetParameterGuard reference argument ** "frontend" generate member methods instantiate a StylesheetParameterGuard instance and pass it to the actual generate method ** this enables central default parameter definition while offering the possibility for custom parameters
2014-05-09Marked DomDocumentCache::item class as privateAdrian Kummerländer
* as the xerces document is not instantiated by DomDocumentCache::item and the class only exports a pointer to the converted xalan document, it makes no sense to expose the class to the outside in the first place
2014-05-06Added basic external read file function test caseAdrian Kummerländer
* ... as a test of how well we are able to test DOM structures * required change of constructDocument visibility
2014-05-04Moved DOM document construction logic into local functionsAdrian Kummerländer
* 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
2014-05-04Changed FilesystemContext constructor to accept xalan::Locator*Adrian Kummerländer
* 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
2014-05-03Revamped DomDocumentCache with regard to thread safetyAdrian Kummerländer
* DomDocumentCache::item class now is _finalized_ by default and doesn't perform document instantiation, just lifetime management ** xercesc::DOMDocument is instantiated inside the external function implementations and committed to the document cache for conversion to a xalan document * added mutex with scoped lock to prevent concurrent write access to the std::unordered_map contained withing DomDocumentCache * functionality of the _get_ member method was split into _get_ and _create_ ** added typedef for std::pair specialization type "optional_item" that functions as the return value of _create_ and _get_ * "locator->getSystemId()" was leaking memory as xerces doesn't manage the lifetime of the returned heap-allocated char array ** analog to XMLCh* strings ** transformed XercesStringGuard into template class to be instantiated on either XMLCh or char
2014-04-30Moved file reading functionality into local functionsAdrian Kummerländer
* 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
2014-04-28Adapted read-directory tree construction to match the other functionsAdrian Kummerländer
* 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
2014-04-26Converted external read-file function output into a node setAdrian Kummerländer
* 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
2014-04-26Moved DomDocumentCache instances back into external function classAdrian Kummerländer
* A global DomDocumentCache instance would require key prefixing * switched internal data structure to std::unordered_map for average constant time access
2014-04-26Implemented global DOM document cacheAdrian Kummerländer
* 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
2014-04-24Added XercesStringGuard scope-guard to manage XMLChAdrian Kummerländer
* xercesc requires XMLCh* strings to be hand-allocated and released using the XMLString class * XercesStringGuard works as a scope-guard for XMLCh* string lifetime and greatly simplifies xerces DOM construction
2014-04-24Expanded FunctionReadDirectory class to return files and directoriesAdrian Kummerländer
* they are marked appropriately by a _type_ attribute
2014-04-23Fixed xerces DOM construction related memory leaksAdrian Kummerländer
* Wrapped xerces DOM and support class instances in now DomDocumentGuard scope-guard class * FunctionReadDirectory class contains interal std::stack instance to store DomDocumentGuard instances ** wrapped in std::shared_ptr as FunctionReadDirectory is internally cloned by xalan... ** this is needed as the DOM has to preserved longer than the external function execution scope * Sadly XMLCh xerces strings have to be manually released ** added appropriate xercesc::XMLString::release calls * xalan::XercesDOMWrapperParsedSource does not mirror a given xerces DOM but convert it on instantiation ** this is why there is a dedicated finalize member method in InputXSLT::DomDocumentGuard * In short: I do not like the amount of trickery needed to simply prevent memory leaks in this context ** there sadly doesn't seem to be a substantially easier way to return arbitrary DOM trees from a external function
2014-04-21Implemented basic external directory traversal functionAdrian Kummerländer
* _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)
2014-04-21Extracted filesystem path resolution into InputXSLT::FilesystemContextAdrian Kummerländer
* 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