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Contribute
==========
Contributions to optlang are very welcome. Fork optlang at `github
<http://github.com/biosustain/optlang>`_, implement your feature and send us
a pull request. Also, please use the GitHub `issue tracker <https://github.com/biosustain/optlang/issues>`_
to let us know about bugs or feature requests, or if you have problems or questions regarding optlang.
Add solver interface
--------------------
Put your interface for new solver *XYZ* into a python module with the
name xyz_interface.py. Please use the existing solver interfaces as a reference
for how to wrap a solver. For example, start by subclassing :class:`interface.Model`.
.. code-block:: python
class Model(interface.Model):
def __init__(self, problem=None, *args, **kwargs):
super(Model, self).__init__(*args, **kwargs)
Then you can override the abstract methods defined in :class:`interface.Model`. For
example, override :func:`~interface.Model._add_constraints`.
.. code-block:: python
def _add_constraint(self, constraint):
# Check that constraint is actually supported by XYZ
if not constraint.is_Linear:
raise ValueError("XYZ only supports linear constraints. %s is not linear." % constraint)
# Add the constraint to the user level interface
super(Model, self)._add_constraint(constraint)
# Add variables that are not yet in the model ...
for var in constraint.variables:
if var.name not in self.variables:
self._add_variable(var)
# Link the model to the constraint
constraint.problem = self
# Add solver specific code ...
xyz_add_rows(self.problem, 1)
index = xyz_get_num_rows(self.problem)
xyz_set_row_name(self.problem, index, constraint.name)
...
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