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

15 files changed, 121 insertions, 119 deletions

diff --git a/src/function/base.h b/src/function/base.h
index 5212d65..5aada0e 100644
--- a/src/function/base.h
+++ b/src/function/base.h
@@ -96,16 +96,18 @@ class FunctionBase : public xalan::Function {
 			const xalan::Locator* locator,
 			Sequence<Index...>
 		) const {
+			XObjectValue valueGetter(
+				this->include_resolver_->resolve(
+					locator->getSystemId()
+				),
+				this->include_resolver_
+			);
+
 			return this->document_cache_->create(
 				static_cast<Implementation*>(
 					const_cast<FunctionBase*>(this)
 				)->constructDocument(
-					FilesystemContext(
-						this->include_resolver_->resolve(
-							locator->getSystemId()
-						)
-					),
-					XObjectValue::get<typename std::tuple_element<
+					valueGetter.get<typename std::tuple_element<
 						Index,
 						std::tuple<Types...>
 					>::type>(parameters[Index])...
diff --git a/src/function/external_text_formatter.cc b/src/function/external_text_formatter.cc
index 4171ded..b2f9d33 100644
--- a/src/function/external_text_formatter.cc
+++ b/src/function/external_text_formatter.cc
@@ -43,7 +43,6 @@ inline xercesc::DOMNode* importDocumentElement(
 namespace InputXSLT {
 
 xercesc::DOMDocument* FunctionExternalTextFormatter::constructDocument(
-	const InputXSLT::FilesystemContext&,
 	std::string formatterPath,
 	std::string stdinText
 ) {
diff --git a/src/function/external_text_formatter.h b/src/function/external_text_formatter.h
index 95ff127..3af1d52 100644
--- a/src/function/external_text_formatter.h
+++ b/src/function/external_text_formatter.h
@@ -17,7 +17,6 @@ class FunctionExternalTextFormatter : public FunctionBase<
 		friend FunctionBase;
 
 		xercesc::DOMDocument* constructDocument(
-			const FilesystemContext&,
 			std::string,
 			std::string
 		);
diff --git a/src/function/read_directory.cc b/src/function/read_directory.cc
index cfbe302..884963e 100644
--- a/src/function/read_directory.cc
+++ b/src/function/read_directory.cc
@@ -10,13 +10,7 @@
 namespace InputXSLT {
 
 xercesc::DOMDocument* FunctionReadDirectory::constructDocument(
-	const InputXSLT::FilesystemContext& fsContext,
-	std::string path
-) {
-	const boost::filesystem::path directoryPath(
-		fsContext.resolve(path)
-	);
-
+	boost::filesystem::path directoryPath) {
 	xercesc::DOMDocument* const domDocument(
 		xercesc::DOMImplementation::getImplementation()->createDocument(
 			nullptr,
@@ -37,7 +31,7 @@ xercesc::DOMDocument* FunctionReadDirectory::constructDocument(
 
 		xercesc::DOMNode* const resultNode = result.getNode();
 
-		fsContext.iterate(
+		FilesystemContext::iterate(
 			directoryPath,
 			[&domDocument, &resultNode](const boost::filesystem::path& p) {
 			ResultNodeFacade result(domDocument, resultNode, "entry");
diff --git a/src/function/read_directory.h b/src/function/read_directory.h
index 6366a09..41976d5 100644
--- a/src/function/read_directory.h
+++ b/src/function/read_directory.h
@@ -1,13 +1,15 @@
 #ifndef INPUTXSLT_SRC_FUNCTION_READ_DIRECTORY_H_
 #define INPUTXSLT_SRC_FUNCTION_READ_DIRECTORY_H_
 
+#include "boost/filesystem.hpp"
+
 #include "base.h"
 
 namespace InputXSLT {
 
 class FunctionReadDirectory : public FunctionBase<
 	FunctionReadDirectory,
-	std::string
+	boost::filesystem::path
 > {
 	public:
 		using FunctionBase::FunctionBase;
@@ -15,10 +17,7 @@ class FunctionReadDirectory : public FunctionBase<
 	protected:
 		friend FunctionBase;
 
-		xercesc::DOMDocument* constructDocument(
-			const FilesystemContext&,
-			std::string
-		);
+		xercesc::DOMDocument* constructDocument(boost::filesystem::path);
 
 };
 
diff --git a/src/function/read_file.cc b/src/function/read_file.cc
index 1ea76c7..96e677f 100644
--- a/src/function/read_file.cc
+++ b/src/function/read_file.cc
@@ -49,18 +49,7 @@ inline std::string readPlainFile(const boost::filesystem::path& filePath) {
 namespace InputXSLT {
 
 xercesc::DOMDocument* FunctionReadFile::constructDocument(
-	const FilesystemContext& fsContext,
-	std::string rawPath
-) {
-	boost::filesystem::path filePath(fsContext.resolve(rawPath));
-
-	if ( !(boost::filesystem::exists(filePath) &&
-	       boost::filesystem::is_regular_file(filePath)) ) {
-		if ( auto resolvedPath = this->include_resolver_->resolve(rawPath) ) {
-			filePath = *resolvedPath;
-		}
-	}
-
+	boost::filesystem::path filePath) {
 	xercesc::DOMDocument* const domDocument(
 		xercesc::DOMImplementation::getImplementation()->createDocument(
 			nullptr,
diff --git a/src/function/read_file.h b/src/function/read_file.h
index fec8fe2..9c2185a 100644
--- a/src/function/read_file.h
+++ b/src/function/read_file.h
@@ -1,13 +1,15 @@
 #ifndef INPUTXSLT_SRC_FUNCTION_READ_FILE_H_
 #define INPUTXSLT_SRC_FUNCTION_READ_FILE_H_
 
+#include "boost/filesystem.hpp"
+
 #include "base.h"
 
 namespace InputXSLT {
 
 class FunctionReadFile : public FunctionBase<
 	FunctionReadFile,
-	std::string
+	boost::filesystem::path
 > {
 	public:
 		using FunctionBase::FunctionBase;
@@ -15,10 +17,7 @@ class FunctionReadFile : public FunctionBase<
 	protected:
 		friend FunctionBase;
 
-		xercesc::DOMDocument* constructDocument(
-			const FilesystemContext&,
-			std::string
-		);
+		xercesc::DOMDocument* constructDocument(boost::filesystem::path);
 
 };
 
diff --git a/src/function/transform.cc b/src/function/transform.cc
index 62b89ba..3ab6475 100644
--- a/src/function/transform.cc
+++ b/src/function/transform.cc
@@ -29,10 +29,9 @@ inline std::function<void(const ErrorCapacitor::error_cache&)> handleErrors(
 namespace InputXSLT {
 
 xercesc::DOMDocument* FunctionTransform::constructDocument(
-	const InputXSLT::FilesystemContext& fsContext,
-	xalan::XSLTInputSource              transformationSource,
-	std::string                         targetPath,
-	xalan::XObjectPtr                   parameterObject
+	xalan::XSLTInputSource  transformationSource,
+	boost::filesystem::path targetPath,
+	xalan::XObjectPtr       parameterObject
 ) {
 	xercesc::DOMDocument* const domDocument(
 		xercesc::DOMImplementation::getImplementation()->createDocument(
@@ -50,7 +49,7 @@ xercesc::DOMDocument* FunctionTransform::constructDocument(
 
 	result.setAttribute(
 		"target",
-		boost::filesystem::path(targetPath).filename().string()
+		targetPath.filename().string()
 	);
 
 	if ( auto transformation = TransformationFacade::try_create(
@@ -60,7 +59,7 @@ xercesc::DOMDocument* FunctionTransform::constructDocument(
 	) ) {
 		try {
 			transformation->generate(
-				fsContext.resolve(targetPath).string(),
+				targetPath.string(),
 				parameterObject
 			);
 
diff --git a/src/function/transform.h b/src/function/transform.h
index 081fe90..516233f 100644
--- a/src/function/transform.h
+++ b/src/function/transform.h
@@ -3,6 +3,8 @@
 
 #include <xalanc/XSLT/XSLTInputSource.hpp>
 
+#include "boost/filesystem.hpp"
+
 #include "base.h"
 
 namespace InputXSLT {
@@ -10,7 +12,7 @@ namespace InputXSLT {
 class FunctionTransform : public FunctionBase<
 	FunctionTransform,
 	xalan::XSLTInputSource,
-	std::string,
+	boost::filesystem::path,
 	xalan::XObjectPtr
 > {
 	public:
@@ -20,9 +22,8 @@ class FunctionTransform : public FunctionBase<
 		friend FunctionBase;
 
 		xercesc::DOMDocument* constructDocument(
-			const FilesystemContext&,
 			xalan::XSLTInputSource,
-			std::string,
+			boost::filesystem::path,
 			xalan::XObjectPtr
 		);
 
diff --git a/src/support/filesystem_context.cc b/src/support/filesystem_context.cc
index a18ec43..21548a5 100644
--- a/src/support/filesystem_context.cc
+++ b/src/support/filesystem_context.cc
@@ -4,52 +4,13 @@
 #include <iterator>
 
 #include "support/xalan_string.h"
-#include "support/xerces_string_guard.h"
 
 namespace InputXSLT {
 
-FilesystemContext::FilesystemContext(const boost::filesystem::path& path):
-	path_(boost::filesystem::canonical(
-		path.parent_path()
-	)) { }
-
-FilesystemContext::FilesystemContext(const std::string& path):
-	path_(boost::filesystem::canonical(path)) { }
-
-boost::filesystem::path FilesystemContext::resolve(
-	const std::string& path) const {
-	const boost::filesystem::path targetPath(path);
-
-	if ( targetPath.is_absolute() ) {
-		return targetPath;
-	} else {
-		return absolute(this->path_ / targetPath);
-	}
-}
-
-boost::filesystem::path FilesystemContext::resolve(
-	const xalan::XalanDOMString& path) const {
-	return this->resolve(toString(path));
-}
-
-void FilesystemContext::iterate(
-	const std::string& path,
-	const std::function<void(const boost::filesystem::path&)>& func
-) const {
-	this->iterate(this->resolve(path), func);
-}
-
-void FilesystemContext::iterate(
-	const xalan::XalanDOMString& path,
-	const std::function<void(const boost::filesystem::path&)>& func
-) const {
-	this->iterate(toString(path), func);
-}
-
 void FilesystemContext::iterate(
 	const boost::filesystem::path& directory,
 	const std::function<void(const boost::filesystem::path&)>& func
-) const {
+) {
 	std::vector<boost::filesystem::path> directoryItems;
 
 	std::copy_if(
@@ -74,4 +35,26 @@ void FilesystemContext::iterate(
 	);
 }
 
+FilesystemContext::FilesystemContext(const boost::filesystem::path& path):
+	path_(boost::filesystem::canonical(
+		path.parent_path()
+	)) { }
+
+FilesystemContext::FilesystemContext(const std::string& path):
+	path_(boost::filesystem::canonical(path)) { }
+
+boost::filesystem::path FilesystemContext::resolve(
+	const xalan::XalanDOMString& path) const {
+	return this->resolve(toString(path));
+}
+
+boost::filesystem::path FilesystemContext::resolve(
+	const boost::filesystem::path& path) const {
+	if ( path.is_absolute() ) {
+		return path;
+	} else {
+		return absolute(this->path_ / path);
+	}
+}
+
 }
diff --git a/src/support/filesystem_context.h b/src/support/filesystem_context.h
index 9741039..2088c6b 100644
--- a/src/support/filesystem_context.h
+++ b/src/support/filesystem_context.h
@@ -15,26 +15,16 @@ namespace InputXSLT {
 
 class FilesystemContext {
 	public:
+		static void iterate(
+			const boost::filesystem::path&,
+			const std::function<void(const boost::filesystem::path&)>&
+		);
+
 		explicit FilesystemContext(const boost::filesystem::path&);
 		explicit FilesystemContext(const std::string&);
 
-		boost::filesystem::path resolve(const std::string&) const;
 		boost::filesystem::path resolve(const xalan::XalanDOMString&) const;
-
-		void iterate(
-			const std::string&,
-			const std::function<void(const boost::filesystem::path&)>&
-		) const;
-
-		void iterate(
-			const xalan::XalanDOMString&,
-			const std::function<void(const boost::filesystem::path&)>&
-		) const;
-
-		void iterate(
-			const boost::filesystem::path&,
-			const std::function<void(const boost::filesystem::path&)>&
-		) const;
+		boost::filesystem::path resolve(const boost::filesystem::path&) const;
 
 	private:
 		const boost::filesystem::path path_;
diff --git a/src/support/include_entity_resolver.cc b/src/support/include_entity_resolver.cc
index 86535c8..e1c9f96 100644
--- a/src/support/include_entity_resolver.cc
+++ b/src/support/include_entity_resolver.cc
@@ -71,7 +71,7 @@ boost::filesystem::path IncludeEntityResolver::resolve(
 }
 
 boost::optional<boost::filesystem::path> IncludeEntityResolver::resolve(
-	const std::string& filePath) const {
+	const boost::filesystem::path& filePath) const {
 	for ( auto&& context : this->path_ ) {
 		const boost::filesystem::path resolvedPath(
 			context.resolve(filePath)
diff --git a/src/support/include_entity_resolver.h b/src/support/include_entity_resolver.h
index c8f2867..32d9001 100644
--- a/src/support/include_entity_resolver.h
+++ b/src/support/include_entity_resolver.h
@@ -25,7 +25,7 @@ class IncludeEntityResolver : public xercesc::EntityResolver {
 		boost::filesystem::path resolve(
 			const XMLCh* const) const;
 		boost::optional<boost::filesystem::path> resolve(
-			const std::string&) const;
+			const boost::filesystem::path&) const;
 
 	private:
 		const std::vector<FilesystemContext> path_;
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_;
+
+};
 
 }