Implemented StylesheetParameterGuard class

* removes responsibility for clearing parameters from the generate member methods
* abstracts parameter escaping and setting and handles map conversion
* marked actual generate member method as private and added StylesheetParameterGuard reference argument
** "frontend" generate member methods instantiate a StylesheetParameterGuard instance and pass it to the actual generate method
** this enables central default parameter definition while offering the possibility for custom parameters

2 files changed, 71 insertions, 0 deletions

diff --git a/src/support/stylesheet_parameter_guard.cc b/src/support/stylesheet_parameter_guard.cc
new file mode 100644
index 0000000..f82c2d5
--- /dev/null
+++ b/src/support/stylesheet_parameter_guard.cc
@@ -0,0 +1,36 @@
+#include "stylesheet_parameter_guard.h"
+
+namespace InputXSLT {
+
+StylesheetParameterGuard::StylesheetParameterGuard(
+	xalan::XalanTransformer& transformer
+): transformer_(transformer) { }
+
+StylesheetParameterGuard::StylesheetParameterGuard(
+	xalan::XalanTransformer& transformer,
+	const map& parameters
+): transformer_(transformer) {
+	this->set(parameters);
+}
+
+StylesheetParameterGuard::~StylesheetParameterGuard() {
+	this->transformer_.clearStylesheetParams();
+}
+
+void StylesheetParameterGuard::set(const map& parameters) {
+	for ( auto&& parameter : parameters ) {
+		this->set(parameter.first, parameter.second);
+	}
+}
+
+void StylesheetParameterGuard::set(
+	const std::string& key,
+	const std::string& value
+) {
+	this->transformer_.setStylesheetParam(
+		key.data(),
+		std::string("'" + value + "'").data()
+	);
+}
+
+}
diff --git a/src/support/stylesheet_parameter_guard.h b/src/support/stylesheet_parameter_guard.h
new file mode 100644
index 0000000..f0622ad
--- /dev/null
+++ b/src/support/stylesheet_parameter_guard.h
@@ -0,0 +1,35 @@
+#ifndef INPUTXSLT_SRC_SUPPORT_STYLESHEET_PARAMETER_GUARD_H_
+#define INPUTXSLT_SRC_SUPPORT_STYLESHEET_PARAMETER_GUARD_H_
+
+#include <xalanc/XalanTransformer/XalanTransformer.hpp>
+
+#include <string>
+#include <unordered_map>
+
+#include "common.h"
+
+namespace InputXSLT {
+
+class StylesheetParameterGuard {
+	public:
+		typedef std::unordered_map<std::string, std::string> map;
+
+		explicit StylesheetParameterGuard(xalan::XalanTransformer&);
+		StylesheetParameterGuard(
+			xalan::XalanTransformer&,
+			const map&
+		);
+
+		~StylesheetParameterGuard();
+
+		void set(const map&);
+		void set(const std::string&, const std::string&);
+
+	private:
+		xalan::XalanTransformer& transformer_;
+
+};
+
+}
+
+#endif  // INPUTXSLT_SRC_SUPPORT_STYLESHEET_PARAMETER_GUARD_H_