--- parser3/src/include/pa_request.h	2001/01/30 11:51:07	1.3
+++ parser3/src/include/pa_request.h	2001/02/21 11:10:02	1.5
@@ -1,25 +1,67 @@
 /*
-  $Id: pa_request.h,v 1.3 2001/01/30 11:51:07 paf Exp $
+  $Id: pa_request.h,v 1.5 2001/02/21 11:10:02 paf Exp $
 */
 
 #ifndef PA_REQUEST_H
 #define PA_REQUEST_H
 
 #include "pa_pool.h"
+#include "pa_exception.h"
+#include "pa_hash.h"
+
+class Local_request_exception;
 
 class Request {
+	friend Local_request_exception;
 public:
 	
-	// all request' objects are allocated in this pool
-	// they die with request
-	Pool& pool() { return fpool; }
-	
-	Request(Pool& apool) : fpool(apool) {}
+	Request(Pool& apool) : 
+		fpool(apool), 
+		fclasses(new(apool) Hash(apool)) {
+	}
 	~Request() {}
 
+	// IMPORTANT: don't use pool without  Local_request_exception 
+	Pool& pool() { return fpool; }
+
+	Exception& exception() { return *fexception; }
+	Hash& classes() { return *fclasses; }
+
 protected:
 
+	// all request' objects are allocated in this pool
 	Pool& fpool;
+
+	// exception replacement mechanism is protected from direct usage
+	// Local_request_exception object enforces paired set/restore
+	Exception *set_exception(Exception *e){
+		Exception *r=fexception;
+		fexception=e;
+		return r;
+	}
+	void restore_exception(Exception *e) {
+		fexception=e;
+	}
+
+private:
+
+	// current request's exception object
+	Exception *fexception;
+
+	// defined classes
+	Hash *fclasses;
+
 };
 
+class Local_request_exception {
+	Request request;
+	Exception *saved_exception;
+public:
+	Local_request_exception(Request& arequest, Exception& exception) : 
+		request(arequest),
+		saved_exception(arequest.set_exception(&exception)) {}
+	~Local_request_exception() { request.restore_exception(saved_exception); }
+};
+
+
 #endif