def __call__(self, model, output_filename, solver_capability, io_options):
if output_filename is None:
output_filename = model.name + ".bar"
# If the user provides a file name, we will use the opened file
# as a context manager to ensure it gets closed. If the user
# provided something else (e.g., a file-like object), we will
# use a nullcontext manager to prevent closing it.
if isinstance(output_filename, str):
output_file = open(output_filename, "w")
else:
output_file = nullcontext(output_filename)
with output_file as FILE:
symbol_map = self._write_bar_file(model, FILE, solver_capability,
io_options)
return output_filename, symbol_map
def available(self, exception_flag=False):
""" True if the solver is available """
if self._assert_available:
return True
if not OptSolver.available(self, exception_flag):
return False
try:
# HACK: Suppress logged warnings about the executable not
# being found
cm = nullcontext() if exception_flag else LoggingIntercept()
with cm:
ans = self.executable()
except NotImplementedError:
ans = None
if ans is None:
if exception_flag:
msg = "No executable found for solver '%s'"
raise ApplicationError(msg % self.name)
return False
return True