int
rasqal_rowsource_set_requirements(rasqal_rowsource* rowsource, unsigned int flags)
{
return rasqal_rowsource_visit(rowsource,
rasqal_rowsource_visitor_set_requirements,
&flags);
}
/**
* rasqal_rowsource_visit:
* @node: #rasqal_rowsource row source
* @fn: pointer to function to apply that takes user data and rowsource parameters
* @user_data: user data for applied function
*
* Visit a user function over a #rasqal_rowsource
*
* If the user function @fn returns 0, the visit is truncated.
*
* Return value: non-0 if the visit was truncated or on failure.
**/
int
rasqal_rowsource_visit(rasqal_rowsource* rowsource,
rasqal_rowsource_visit_fn fn,
void *user_data)
{
int result;
int offset;
rasqal_rowsource* inner_rs;
if(!rowsource || !fn)
return 1;
result = fn(rowsource, user_data);
/* end if failed */
if(result < 0)
return result;
/* Do not recurse if handled */
if(result > 0)
return 0;
for(offset = 0;
(inner_rs = rasqal_rowsource_get_inner_rowsource(rowsource, offset));
offset++) {
result = rasqal_rowsource_visit(inner_rs, fn, user_data);
/* end if failed */
if(result < 0)
return result;
}
return 0;
}
int
rasqal_rowsource_set_origin(rasqal_rowsource* rowsource,
rasqal_literal *literal)
{
rasqal_rowsource_visit(rowsource,
rasqal_rowsource_visitor_set_origin,
literal);
return 0;
}
/**
* rasqal_rowsource_visit:
* @node: #rasqal_rowsource row source
* @fn: pointer to function to apply that takes user data and rowsource parameters
* @user_data: user data for applied function
*
* Visit a user function over a #rasqal_rowsource
*
* If the user function @fn returns 0, the visit is truncated.
*
* Return value: 0 if the visit was truncated.
**/
int
rasqal_rowsource_visit(rasqal_rowsource* rowsource,
rasqal_rowsource_visit_fn fn,
void *user_data)
{
int result;
int offset;
rasqal_rowsource* inner_rs;
result = fn(rowsource, user_data);
if(result)
return result;
for(offset = 0;
(inner_rs = rasqal_rowsource_get_inner_rowsource(rowsource, offset));
offset++) {
result = rasqal_rowsource_visit(inner_rs, fn, user_data);
if(result)
return result;
}
return 0;
}