# ____________________________________________________________________________________
#
# Pyomo: Python Optimization Modeling Objects
# Copyright (c) 2008-2026 National Technology and Engineering Solutions of Sandia, LLC
# Under the terms of Contract DE-NA0003525 with National Technology and Engineering
# Solutions of Sandia, LLC, the U.S. Government retains certain rights in this
# software. This software is distributed under the 3-clause BSD License.
# ____________________________________________________________________________________
from pyomo.opt.base import OptSolver
from pyomo.opt.base.solvers import SolverFactory
import logging
logger = logging.getLogger('pyomo.solvers')
[docs]
@SolverFactory.register('xpress', doc='The XPRESS LP/MIP solver')
class XPRESS(OptSolver):
"""The XPRESS LP/MIP solver"""
def __new__(cls, *args, **kwds):
mode = kwds.pop('solver_io', 'python')
if mode is None:
mode = 'python'
if mode not in {'python', 'direct', 'persistent'}:
logger.error(
'Pyomo currently only supports a Python interface to XPRESS. '
'Please use one of python, direct, or persistent for solver_io.'
)
return
if mode in ['python', 'direct']:
opt = SolverFactory('xpress_direct', **kwds)
elif mode == 'persistent':
opt = SolverFactory('xpress_persistent', **kwds)
if opt is None:
logger.error('Python API for XPRESS is not installed')
return opt