Implemented global DOM document cache

* 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

1 files changed, 18 insertions, 0 deletions

diff --git a/src/support/utility.h b/src/support/utility.h
new file mode 100644
index 0000000..4c63c72
--- /dev/null
+++ b/src/support/utility.h
@@ -0,0 +1,18 @@
+#ifndef INPUTXSLT_SRC_SUPPORT_UTILITY_H_
+#define INPUTXSLT_SRC_SUPPORT_UTILITY_H_
+
+namespace {
+
+inline std::string xalanToString(const xalan::XalanDOMString& text) {
+	xalan::CharVectorType castHelper;
+	text.transcode(castHelper);
+
+	return std::string(
+		castHelper.begin(),
+		castHelper.end() - 1
+	);
+}
+
+}
+
+#endif  // INPUTXSLT_SRC_SUPPORT_UTILITY_H_