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, 42 insertions, 0 deletions

diff --git a/src/support/dom/document_cache_item.h b/src/support/dom/document_cache_item.h
new file mode 100644
index 0000000..1f7152b
--- /dev/null
+++ b/src/support/dom/document_cache_item.h
@@ -0,0 +1,42 @@
+#ifndef INPUTXSLT_SRC_SUPPORT_DOM_DOCUMENT_CACHE_ITEM_H_
+#define INPUTXSLT_SRC_SUPPORT_DOM_DOCUMENT_CACHE_ITEM_H_
+
+#include <xalanc/XercesParserLiaison/XercesParserLiaison.hpp>
+#include <xalanc/XercesParserLiaison/XercesDOMSupport.hpp>
+#include <xalanc/XalanTransformer/XercesDOMWrapperParsedSource.hpp>
+
+#include <xercesc/dom/DOMDocument.hpp>
+
+#include <string>
+#include <memory>
+
+#include "common.h"
+#include "document_cache.h"
+
+namespace InputXSLT {
+
+class DomDocumentCache::item {
+	public:
+		~item();
+
+		bool isFinalized() const;
+
+		xercesc::DOMDocument* getXercesDocument() const;
+		xalan::XalanDocument* getXalanDocument();
+
+	protected:
+		friend DomDocumentCache;
+
+		item(const std::string&);
+
+	private:
+		xalan::XercesParserLiaison parser_;
+		xalan::XercesDOMSupport dom_support_;
+		xercesc::DOMDocument* const document_;
+		std::unique_ptr<xalan::XercesDOMWrapperParsedSource> parsed_source_;
+
+};
+
+}
+
+#endif  // INPUTXSLT_SRC_SUPPORT_DOM_DOCUMENT_CACHE_ITEM_H_