Implemented ErrorMultiplexer as primary error handler

* ErrorMultiplexer is derived from both xercesc::ErrorHandler and xalan::ProblemListener
* registers itself as XalanTransformer's ErrorHandler and ProblemListener
* distributes captured errors and warnings to all registered ErrorMultiplexer::Receiver instances
** ErrorCapacitor implements the ErrorMultiplexer::Receiver interface and as such registers itself in a given ErrorMultiplexer instance
** ErrorMultiplexer reduces the different xalan and xercesc internal error classifications into either warnings or errors
* this was implemented to make it possible to easily differentiate between warnings and errors
** previously warnings were treated as errors
** ErrorCapacitor ignores warnings and only captures errors
** WarningCapacitor will be implemented to handle warnings during XSLT processing

1 files changed, 46 insertions, 0 deletions

diff --git a/src/support/error/error_capacitor.h b/src/support/error/error_capacitor.h
new file mode 100644
index 0000000..6017cb4
--- /dev/null
+++ b/src/support/error/error_capacitor.h
@@ -0,0 +1,46 @@
+#ifndef INPUTXSLT_SRC_SUPPORT_ERROR_ERROR_CAPACITOR_H_
+#define INPUTXSLT_SRC_SUPPORT_ERROR_ERROR_CAPACITOR_H_
+
+#include <memory>
+
+#include "error_multiplexer.h"
+
+namespace InputXSLT {
+
+class ErrorCapacitor : public ErrorMultiplexer::Receiver {
+	public:
+		class exception;
+
+		typedef std::vector<std::string> error_cache;
+		typedef std::unique_ptr<error_cache> error_cache_ptr;
+
+		ErrorCapacitor(ErrorMultiplexer*);
+		~ErrorCapacitor();
+
+		void discharge();
+
+		virtual void receive(
+			const ErrorMultiplexer::ErrorType,
+			const std::string&
+		);
+
+	private:
+		ErrorMultiplexer* const multiplexer_;
+		error_cache_ptr error_cache_;
+
+};
+
+class ErrorCapacitor::exception {
+	public:
+		exception(error_cache_ptr);
+
+		const error_cache* getCachedErrors() const;
+
+	private:
+		error_cache_ptr error_cache_;
+
+};
+
+}
+
+#endif  // INPUTXSLT_SRC_SUPPORT_ERROR_ERROR_CAPACITOR_H_