| Libbonobo Reference Manual |
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bonobo-exception — maps CORBA exceptions to user readable text, + helper macros
#define bonobo_exception_set (opt_ev,repo_id) #define bonobo_return_if_fail (expr,opt_ev) #define bonobo_return_val_if_fail (expr,val,opt_ev) #define BONOBO_EX (ev) #define BONOBO_USER_EX (ev,id) #define BONOBO_EX_REPOID (ev) #define BONOBO_RET_EX (ev) #define BONOBO_RET_VAL_EX (ev,v) char* (*BonoboExceptionFn) (CORBA_Environment *ev, gpointer user_data); char* bonobo_exception_get_text (CORBA_Environment *ev); char* bonobo_exception_repoid_to_text (const char *repo_id); void bonobo_exception_add_handler_str (const char *repo_id, const char *str); void bonobo_exception_add_handler_fn (const char *repo_id, BonoboExceptionFn fn, gpointer user_data, GDestroyNotify destroy_fn); void bonobo_exception_general_error_set (CORBA_Environment *ev, CORBA_TypeCode opt_deriv, const char *format, ...); const char* bonobo_exception_general_error_get (CORBA_Environment *ev);
This module contains some useful helper functions that can be used to set various exceptions inside your CORBA methods. It also contains code to map between complex CORBA_Environment exceptions and helpful strings suitable for display to the user.
Typically to test for exceptions the BONOBO_EX macro is used thus:
Example 4. Bonobo exception trapping and reporting
int
do_something (CORBA_Environment *ev)
{
...
retval = Foo_Baa_method (object, ev);
if (BONOBO_EX (ev)) {
if (BONOBO_USER_EX (ev, ex_CosNaming_NamingContext_NotFound)) {
g_warning ("Not found");
} else {
char *str;
g_warning ("Exception 's' occured",
(str = bonobo_exception_get_text (ev)));
g_free (str);
}
return -1;
}
...
}
#define bonobo_exception_set(opt_ev,repo_id)
This macro sets the stateless user exception with repo_id on opt_ev or warns if opt_ev == NULL
| opt_ev : | an optional corba exception environment. |
| repo_id : | repoid of the exception to set. |
#define bonobo_return_if_fail(expr,opt_ev)
this macro is used for bonobo preconditons on argument types, usualy inside skels if expr is FALSE a warning is printed and opt_ev is set to ex_Bonobo_BadArg.
| expr : | an expression that should be true |
| opt_ev : | an optional corba exception environment. |
#define bonobo_return_val_if_fail(expr,val,opt_ev)
this macro is used for bonobo preconditons on argument types, usualy inside skels if expr is FALSE a warning is printed and opt_ev is set to ex_Bonobo_BadArg.
| expr : | an expression that should be true |
| val : | a value to return on failure. |
| opt_ev : | an optional corba exception environment. |
#define BONOBO_EX(ev) ((ev) && (ev)->_major != CORBA_NO_EXCEPTION)
This macro returns TRUE if ev flags an exception.
| ev : | the exception environment |
#define BONOBO_USER_EX(ev,id)
This macro returns TRUE if ev contains a user exception of type id.
| ev : | the exception environment |
| id : | the repo_id of the exception |
#define BONOBO_EX_REPOID(ev) (ev)->_id
Returns the repoid string of exception ev.
| ev : | a CORBA exception |
#define BONOBO_RET_EX(ev)
returns if there is an exception flagged in ev.
| ev : | the exception environment |
#define BONOBO_RET_VAL_EX(ev,v)
returns v if there is an exception flagged in ev
| ev : | the exception environment |
| v : | the value to return |
char* (*BonoboExceptionFn) (CORBA_Environment *ev,
gpointer user_data);The prototype for user registerable exception decoders.
| ev : | the exception environment |
| user_data : | user data to be passed to the function |
| Returns : | a g_malloc'd copy of a translated user readable error string. |
char* bonobo_exception_get_text (CORBA_Environment *ev);
Returns a user readable description of the exception. First checks ev against builtin Bonobo exceptions, then falls back to exception names added through bonobo_exception_add_handler_str or bonobo_exception_add_handler_fn.
| ev : | the corba environment. |
| Returns : | A g_malloc'd description, which the caller must free. NULL is never returned. |
char* bonobo_exception_repoid_to_text (const char *repo_id);
This maps builtin bonobo exceptions that the system knows about to user readable strings.
| repo_id : | exception repository id |
| Returns : | a user string or NULL for an unknown repo_id |
void bonobo_exception_add_handler_str
(const char *repo_id,
const char *str);This routine adds a simple string mapping for an exception with repository id repo_id, such that when we call bonobo_exception_get_text on an exception of id repo_id we get str back.
| repo_id : | exception repository id |
| str : | the user readable, translated exception text. |
void bonobo_exception_add_handler_fn (const char *repo_id,
BonoboExceptionFn fn,
gpointer user_data,
GDestroyNotify destroy_fn);This routine adds a method mapping for an exception with repository id repo_id, such that when we call bonobo_exception_get_text on an exception of id repo_id the fn is called and passed user_data. When the handler is removed the destroy_fn is called on its user_data.
| repo_id : | exception repository id |
| fn : | function to make exception human readable |
| user_data : | the user data |
| destroy_fn : | user data destroy function or NULL. |
void bonobo_exception_general_error_set
(CORBA_Environment *ev,
CORBA_TypeCode opt_deriv,
const char *format,
...);
| ev : | |
| opt_deriv : | |
| format : | |
| ... : |
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