Rewrote error handling based on exceptions

* ErrorHandler is replaced by ErrorCapacitor
** temporarily registers itself as both the ProblemListener and ErrorHandler of a given XalanTransformer instance
** deregisters itself on destruction
** collects all problems and errors during its lifetime inside a internal std::vector<std::string> instance
** if this instance is not empty it is thrown contained within a ErrorCapacitor::exception by the member method ErrorCapacitor::discharge
* this enables using the same code for handling transformation compilation and generation errors and problems
* updated test frontend accordingly

1 files changed, 81 insertions, 0 deletions

diff --git a/src/support/error_capacitor.h b/src/support/error_capacitor.h
new file mode 100644
index 0000000..d89b5ae
--- /dev/null
+++ b/src/support/error_capacitor.h
@@ -0,0 +1,81 @@
+#ifndef INPUTXSLT_SRC_SUPPORT_ERROR_CAPACITOR_H_
+#define INPUTXSLT_SRC_SUPPORT_ERROR_CAPACITOR_H_
+
+#include <xercesc/sax/ErrorHandler.hpp>
+#include <xalanc/XSLT/ProblemListener.hpp>
+#include <xalanc/XalanTransformer/XalanTransformer.hpp>
+
+#include <memory>
+#include <vector>
+#include <string>
+
+#include "common.h"
+
+namespace InputXSLT {
+
+class ErrorCapacitor : public xercesc::ErrorHandler,
+                     public xalan::ProblemListener {
+	public:
+		class exception;
+
+		typedef std::vector<std::string> error_cache;
+		typedef std::unique_ptr<error_cache> error_cache_ptr;
+
+		ErrorCapacitor(xalan::XalanTransformer*);
+		~ErrorCapacitor();
+
+		void discharge();
+
+		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::XalanNode*,
+			const xalan::ElemTemplateElement*,
+			const xalan::XalanDOMString&,
+			const xalan::XalanDOMChar*,
+			xalan::XalanFileLoc,
+			xalan::XalanFileLoc
+		);
+
+		virtual void problem(
+			xalan::ProblemListenerBase::eSource,
+			xalan::ProblemListenerBase::eClassification,
+			const xalan::XalanDOMString&,
+			const xalan::XalanNode*
+		);
+
+		virtual void setPrintWriter(xalan::PrintWriter*);
+
+	private:
+		xalan::XalanTransformer* const transformer_;
+		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_CAPACITOR_H_