Revamped external function result trees

* the root node of the result tree of each function is a domain element
** i.e. the root node of "read-xml-file" is "file", the root node of "read-directory" is "directory"
* the root node contains the result state of the function call encoded in a "result" attribute
** possible values are "success" and "error"
** the root node may contain additional attributes such as the target path of a called transformation
* the actual function result is contained within the child nodes of the function root node
** i.e. the XML file tree returned by "read-xml-file" is a child of the function root node
** if specific errors occured they are also returned as child nodes of the function root node
*** this is currently only the case for "transform" where transformation errors are returned as "error" value node childs of the function root node
* updated test cases accordingly

1 files changed, 5 insertions, 3 deletions

diff --git a/src/function/read_file.cc b/src/function/read_file.cc
index 87423ab..79e321d 100644
--- a/src/function/read_file.cc
+++ b/src/function/read_file.cc
@@ -50,13 +50,15 @@ xercesc::DOMDocument* FunctionReadFile::constructDocument(
 		domDocument->getDocumentElement()
 	);
 
+	ResultNodeFacade result(domDocument, rootNode, "file");
+	result.setAttribute("path", filePath.string());
+
 	if ( boost::filesystem::is_regular_file(filePath) ) {
-		ResultNodeFacade result(domDocument, rootNode, "result");
+		result.setAttribute("result", "success");
 
-		result.setAttribute("name", filePath.filename().string());
 		result.setContent(readFile(filePath));
 	} else {
-		ResultNodeFacade result(domDocument, rootNode, "error");
+		result.setAttribute("result", "success");
 	}
 
 	return domDocument;