Changed external functions to enable global installation

* up until now all external functions were locally installed to a specific XalanTransformer instance contained within a TransformationGuard instance
** this had to change as I planned to add a "execute-transformation" function based on TransformationGuard which would have led to recursive self-instantiation
** global external functions have to be thread-safe
* as global external function can not be provided with a reference to a transformation-specific FilesystemFacade instance, the working path is now determined using xalan::Locator
** currently using pointer arithmetics on XMLCh* to remove the "file://" prefix of the URI returned by locator->getSystemId(), may be unsafe
* added compilation unit for PlattformGuard as it now contains function installation in addition to plattform lifetime management

1 files changed, 46 insertions, 0 deletions

diff --git a/src/plattform_guard.cc b/src/plattform_guard.cc
new file mode 100644
index 0000000..2c3cee4
--- /dev/null
+++ b/src/plattform_guard.cc
@@ -0,0 +1,46 @@
+#include "plattform_guard.h"
+
+#include <xalanc/Include/PlatformDefinitions.hpp>
+#include <xalanc/XalanTransformer/XalanTransformer.hpp>
+
+#include <xercesc/util/PlatformUtils.hpp>
+
+#include "common.h"
+#include "function/read_file.h"
+#include "function/read_xml_file.h"
+#include "function/read_directory.h"
+
+namespace InputXSLT {
+
+PlattformGuard::PlattformGuard() {
+	xercesc::XMLPlatformUtils::Initialize();
+	xalan::XalanTransformer::initialize();
+
+	const xalan::XalanDOMString customNamespace(
+		"function.inputxslt.application"
+	);
+
+	xalan::XalanTransformer::installExternalFunctionGlobal(
+		customNamespace,
+		xalan::XalanDOMString("read-file"),
+		InputXSLT::FunctionReadFile()
+	);
+
+	xalan::XalanTransformer::installExternalFunctionGlobal(
+		customNamespace,
+		xalan::XalanDOMString("read-xml-file"),
+		InputXSLT::FunctionReadXmlFile()
+	);
+
+	xalan::XalanTransformer::installExternalFunctionGlobal(
+		customNamespace,
+		xalan::XalanDOMString("read-directory"),
+		InputXSLT::FunctionReadDirectory()
+	);
+}
+
+PlattformGuard::~PlattformGuard() {
+	xalan::XalanTransformer::terminate();
+}
+
+}