Added context awareness to XObjectValue casting logic

* added support for defining boost::filesystem::path as a external function parameter
** boost::filesystem::path parameters are resolved against the appropriate FilesystemContext and IncludeEntityResolver instances
* xalan::XSLTInputSource parameter source paths are also resolved
* removed need for passing a reference FilesystemContext to "constructDocument" methods
** they now only accept the parameters of the external function implemented by them
** all path resolution logic is wrapped by the newly created XObjectValue class
* converted XObjectValue namespace into class
** the "get" template method is now a template member method
** this was needed to enable value casting logic to access the appropriate FilesystemContext and IncludeEntityResolver instances
* this commit marks the next step towards the goals defined in 741a70f

2 files changed, 62 insertions, 14 deletions

diff --git a/src/support/type/xobject_value.cc b/src/support/type/xobject_value.cc
index 812be52..0236597 100644
--- a/src/support/type/xobject_value.cc
+++ b/src/support/type/xobject_value.cc
@@ -4,6 +4,7 @@
 #include <xalanc/XalanDOM/XalanDocumentFragment.hpp>
 
 #include <boost/algorithm/string.hpp>
+#include "boost/filesystem.hpp"
 
 #include <string>
 
@@ -11,34 +12,68 @@
 
 namespace InputXSLT {
 
-namespace XObjectValue {
+XObjectValue::XObjectValue(
+	const boost::filesystem::path& path,
+	const IncludeEntityResolver*   resolver
+):
+	filesystem_context_(path),
+	include_resolver_(resolver) { }
 
 template <>
-std::string get<std::string>(const xalan::XObjectPtr& ptr) {
+std::string XObjectValue::get<std::string>(
+	const xalan::XObjectPtr& ptr) const {
 	return boost::trim_copy(toString(ptr->str()));
 }
 
 template <>
-xalan::XObjectPtr get<xalan::XObjectPtr>(const xalan::XObjectPtr& ptr) {
+boost::filesystem::path XObjectValue::get<boost::filesystem::path>(
+	const xalan::XObjectPtr& ptr) const {
+	const boost::filesystem::path rawPath(
+		toString(ptr->str())
+	);
+
+	const boost::filesystem::path filePath(
+		this->filesystem_context_.resolve(rawPath)
+	);
+
+	if ( !(boost::filesystem::exists(filePath) &&
+		   boost::filesystem::is_regular_file(filePath)) ) {
+		if ( auto resolvedPath = this->include_resolver_->resolve(rawPath) ) {
+			return *resolvedPath;
+		} else {
+			return filePath;
+		}
+	} else {
+		return filePath;
+	}
+}
+
+template <>
+xalan::XObjectPtr XObjectValue::get<xalan::XObjectPtr>(
+	const xalan::XObjectPtr& ptr) const {
 	return ptr;
 }
 
 template <>
-xalan::XSLTInputSource get<xalan::XSLTInputSource>(
-	const xalan::XObjectPtr& ptr) {
+xalan::XSLTInputSource XObjectValue::get<xalan::XSLTInputSource>(
+	const xalan::XObjectPtr& ptr) const {
 	switch ( ptr->getType() ) {
 		case xalan::XObject::eObjectType::eTypeNodeSet: {
-			return xalan::XSLTInputSource(ptr->nodeset().item(0));
+			return xalan::XSLTInputSource(
+				ptr->nodeset().item(0)
+			);
 		}
 		case xalan::XObject::eObjectType::eTypeResultTreeFrag: {
-			return xalan::XSLTInputSource(ptr->rtree().getFirstChild());
+			return xalan::XSLTInputSource(
+				ptr->rtree().getFirstChild()
+			);
 		}
 		default: {
-			return xalan::XSLTInputSource(ptr->str());
+			return xalan::XSLTInputSource(
+				this->get<boost::filesystem::path>(ptr).string().data()
+			);
 		}
 	}
 }
 
 }
-
-}
diff --git a/src/support/type/xobject_value.h b/src/support/type/xobject_value.h
index bb602a4..cfc259d 100644
--- a/src/support/type/xobject_value.h
+++ b/src/support/type/xobject_value.h
@@ -4,13 +4,26 @@
 #include <xalanc/XPath/XObject.hpp>
 
 #include "common.h"
+#include "support/filesystem_context.h"
+#include "support/include_entity_resolver.h"
 
 namespace InputXSLT {
 
-namespace XObjectValue {
-	template <typename Type>
-	Type get(const xalan::XObjectPtr&);
-}
+class XObjectValue {
+	public:
+		XObjectValue(
+			const boost::filesystem::path&,
+			const IncludeEntityResolver*
+		);
+
+		template <typename Type>
+		Type get(const xalan::XObjectPtr&) const;
+
+	private:
+		const FilesystemContext filesystem_context_;
+		const IncludeEntityResolver* const include_resolver_;
+
+};
 
 }