Revamped DomDocumentCache with regard to thread safety

* 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

1 files changed, 0 insertions, 18 deletions

diff --git a/src/support/xerces_string_guard.cc b/src/support/xerces_string_guard.cc
deleted file mode 100644
index 14ad29b..0000000
--- a/src/support/xerces_string_guard.cc
+++ /dev/null
@@ -1,18 +0,0 @@
-#include "xerces_string_guard.h"
-
-namespace InputXSLT {
-
-XercesStringGuard::XercesStringGuard(const std::string& src):
-	string_(xercesc::XMLString::transcode(src.data())) { }
-
-XercesStringGuard::~XercesStringGuard() {
-	xercesc::XMLString::release(
-		const_cast<XMLCh**>(&this->string_)
-	);
-}
-
-XMLCh* XercesStringGuard::operator*() {
-	return this->string_;
-}
-
-}