Added ResultNodeFacade constructor overload for root nodes

* the common use case of ResultNodeFacade inside external function implementations is managing the result root node
** this root node can be fetched through the xercesc::DOMDocument instance
** the new alias overload automatically fetches the root node pointer and as such doesn't require a root node parameter
* changed external function implementations accordingly

7 files changed, 19 insertions, 27 deletions

diff --git a/src/function/external_text_formatter.cc b/src/function/external_text_formatter.cc
index a86c71b..de8a296 100644
--- a/src/function/external_text_formatter.cc
+++ b/src/function/external_text_formatter.cc
@@ -47,10 +47,6 @@ DomDocumentCache::document_ptr FunctionExternalTextFormatter::constructDocument(
 		DomDocumentCache::createDocument()
 	);
 
-	xercesc::DOMNode* const rootNode(
-		domDocument->getDocumentElement()
-	);
-
 	boost::process::context context;
 	context.stdout_behavior = boost::process::capture_stream();
 	context.stdin_behavior  = boost::process::capture_stream();
@@ -71,7 +67,7 @@ DomDocumentCache::document_ptr FunctionExternalTextFormatter::constructDocument(
 
 	boost::process::status status = formatterProcess.wait();
 
-	ResultNodeFacade result(domDocument.get(), rootNode, "output");
+	ResultNodeFacade result(domDocument.get(), "output");
 	result.setAttribute("formatter", formatterPath.filename().string());
 	result.setAttribute("code",      std::to_string(status.exit_status()));
 
diff --git a/src/function/read_directory.cc b/src/function/read_directory.cc
index ad82217..cbc64e0 100644
--- a/src/function/read_directory.cc
+++ b/src/function/read_directory.cc
@@ -11,11 +11,7 @@ DomDocumentCache::document_ptr FunctionReadDirectory::constructDocument(
 		DomDocumentCache::createDocument()
 	);
 
-	xercesc::DOMNode* const rootNode(
-		domDocument->getDocumentElement()
-	);
-
-	ResultNodeFacade result(domDocument.get(), rootNode, "directory");
+	ResultNodeFacade result(domDocument.get(), "directory");
 	result.setAttribute("path", directoryPath.string());
 
 	if ( boost::filesystem::is_directory(directoryPath) ) {
diff --git a/src/function/read_file.cc b/src/function/read_file.cc
index cb1e57f..dcd32b7 100644
--- a/src/function/read_file.cc
+++ b/src/function/read_file.cc
@@ -65,11 +65,7 @@ DomDocumentCache::document_ptr FunctionReadFile::constructDocument(
 		DomDocumentCache::createDocument()
 	);
 
-	xercesc::DOMNode* const rootNode(
-		domDocument->getDocumentElement()
-	);
-
-	ResultNodeFacade result(domDocument.get(), rootNode, "file");
+	ResultNodeFacade result(domDocument.get(), "file");
 	result.setAttribute("path", filePath.string());
 
 	if ( boost::filesystem::is_regular_file(filePath) ) {
diff --git a/src/function/transform.cc b/src/function/transform.cc
index c97897e..d7aae94 100644
--- a/src/function/transform.cc
+++ b/src/function/transform.cc
@@ -34,11 +34,7 @@ DomDocumentCache::document_ptr FunctionTransform::constructDocument(
 		DomDocumentCache::createDocument()
 	);
 
-	xercesc::DOMElement* const rootElement(
-		domDocument->getDocumentElement()
-	);
-
-	ResultNodeFacade result(domDocument.get(), rootElement, "transformation");
+	ResultNodeFacade result(domDocument.get(), "transformation");
 	TransformerFacade transformer(this->include_resolver_);
 
 	try {
diff --git a/src/function/write_file.cc b/src/function/write_file.cc
index 872160b..0ad68bf 100644
--- a/src/function/write_file.cc
+++ b/src/function/write_file.cc
@@ -65,11 +65,7 @@ DomDocumentCache::document_ptr FunctionWriteFile::constructDocument(
 		DomDocumentCache::createDocument()
 	);
 
-	xercesc::DOMNode* const rootNode(
-		domDocument->getDocumentElement()
-	);
-
-	ResultNodeFacade result(domDocument.get(), rootNode, "file");
+	ResultNodeFacade result(domDocument.get(), "file");
 	result.setAttribute("path", filePath.string());
 
 	if ( contentNode != nullptr ) {
diff --git a/src/support/dom/result_node_facade.cc b/src/support/dom/result_node_facade.cc
index 570b4e1..c5829c5 100644
--- a/src/support/dom/result_node_facade.cc
+++ b/src/support/dom/result_node_facade.cc
@@ -9,8 +9,18 @@ namespace InputXSLT {
 
 ResultNodeFacade::ResultNodeFacade(
 	xercesc::DOMDocument* document,
-	xercesc::DOMNode* node,
-	const std::string& name
+	const std::string&    name
+):
+	ResultNodeFacade(
+		document,
+		document->getDocumentElement(),
+		name
+	) { }
+
+ResultNodeFacade::ResultNodeFacade(
+	xercesc::DOMDocument* document,
+	xercesc::DOMNode*     node,
+	const std::string&    name
 ):
 	dom_document_(document),
 	result_node_(
diff --git a/src/support/dom/result_node_facade.h b/src/support/dom/result_node_facade.h
index c7e831e..c743f92 100644
--- a/src/support/dom/result_node_facade.h
+++ b/src/support/dom/result_node_facade.h
@@ -11,11 +11,13 @@ namespace InputXSLT {
 
 class ResultNodeFacade {
 	public:
+		ResultNodeFacade(xercesc::DOMDocument*, const std::string&);
 		ResultNodeFacade(
 			xercesc::DOMDocument*,
 			xercesc::DOMNode*,
 			const std::string&
 		);
+
 		~ResultNodeFacade();
 
 		xercesc::DOMElement* getResultElement();