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, 84 insertions, 0 deletions

diff --git a/src/support/error/error_multiplexer.h b/src/support/error/error_multiplexer.h
new file mode 100644
index 0000000..02cfaf8
--- /dev/null
+++ b/src/support/error/error_multiplexer.h
@@ -0,0 +1,84 @@
+#ifndef INPUTXSLT_SRC_SUPPORT_ERROR_ERROR_MULTIPLEXER_H_
+#define INPUTXSLT_SRC_SUPPORT_ERROR_ERROR_MULTIPLEXER_H_
+
+#include <xercesc/sax/ErrorHandler.hpp>
+
+#include <xalanc/XSLT/ProblemListener.hpp>
+#include <xalanc/XalanTransformer/XalanTransformer.hpp>
+
+#include <vector>
+#include <string>
+
+#include "common.h"
+
+namespace InputXSLT {
+
+class ErrorMultiplexer : public xercesc::ErrorHandler,
+                         public xalan::ProblemListener {
+	public:
+		enum class ErrorType;
+		struct Receiver;
+
+		ErrorMultiplexer(xalan::XalanTransformer*);
+		~ErrorMultiplexer();
+
+		void connectReceiver(Receiver*);
+		void disconnectReceiver(Receiver*);
+
+		virtual void warning(const xercesc::SAXParseException&);
+		virtual void error(const xercesc::SAXParseException&);
+		virtual void fatalError(const xercesc::SAXParseException&);
+		virtual void resetErrors();
+
+		virtual void problem(
+			xalan::ProblemListenerBase::eSource,
+			xalan::ProblemListenerBase::eClassification,
+			const xalan::XalanDOMString&,
+			const xalan::Locator*,
+			const xalan::XalanNode*
+		);
+
+		virtual void problem(
+			xalan::ProblemListenerBase::eSource,
+			xalan::ProblemListenerBase::eClassification,
+			const xalan::XalanDOMString&,
+			const xalan::XalanNode*
+		);
+
+		virtual void problem(
+			xalan::ProblemListenerBase::eSource,
+			xalan::ProblemListenerBase::eClassification,
+			const xalan::XalanNode*,
+			const xalan::ElemTemplateElement*,
+			const xalan::XalanDOMString&,
+			const xalan::XalanDOMChar*,
+			xalan::XalanFileLoc,
+			xalan::XalanFileLoc
+		);
+
+		virtual void setPrintWriter(xalan::PrintWriter*);
+
+	private:
+		xalan::XalanTransformer* const transformer_;
+
+		std::vector<Receiver*> receivers_;
+
+		void multiplex(const ErrorType, const std::string&);
+
+};
+
+enum class ErrorMultiplexer::ErrorType {
+	Warning,
+	Error
+};
+
+struct ErrorMultiplexer::Receiver {
+	virtual void receive(
+		const ErrorMultiplexer::ErrorType,
+		const std::string&
+	) = 0;
+};
+
+}
+
+#endif  // INPUTXSLT_SRC_SUPPORT_ERROR_ERROR_MULTIPLEXER_H_