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# -*- Mode: python; tab-width: 4; indent-tabs-mode:nil; coding:utf-8 -*-
# vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4
#
# MDAnalysis --- https://www.mdanalysis.org
# Copyright (c) 2006-2017 The MDAnalysis Development Team and contributors
# (see the file AUTHORS for the full list of names)
#
# Released under the Lesser GNU Public Licence, v2.1 or any higher version
#
# Please cite your use of MDAnalysis in published work:
#
# R. J. Gowers, M. Linke, J. Barnoud, T. J. E. Reddy, M. N. Melo, S. L. Seyler,
# D. L. Dotson, J. Domanski, S. Buchoux, I. M. Kenney, and O. Beckstein.
# MDAnalysis: A Python package for the rapid analysis of molecular dynamics
# simulations. In S. Benthall and S. Rostrup editors, Proceedings of the 15th
# Python in Science Conference, pages 102-109, Austin, TX, 2016. SciPy.
# doi: 10.25080/majora-629e541a-00e
#
# N. Michaud-Agrawal, E. J. Denning, T. B. Woolf, and O. Beckstein.
# MDAnalysis: A Toolkit for the Analysis of Molecular Dynamics Simulations.
# J. Comput. Chem. 32 (2011), 2319--2327, doi:10.1002/jcc.21787
#
"""
Null output --- :mod:`MDAnalysis.coordinates.null`
==================================================
The :class:`NullWriter` provides a Writer instance that behaves like
any other writer but effectively ignores its input and does not write
any output files. This is similar to writing to ``/dev/null``.
This class exists to allow developers writing generic code and tests.
Classes
-------
.. autoclass:: NullWriter
:members:
"""
from . import base
class NullWriter(base.WriterBase):
"""A trajectory Writer that does not do anything.
The NullWriter is the equivalent to ``/dev/null``: it behaves like
a Writer but ignores all input. It can be used in order to
suppress output.
"""
format = "NULL"
multiframe = True
units = {"time": "ps", "length": "Angstrom"}
def __init__(self, filename, **kwargs):
pass
def _write_next_frame(self, obj):
try:
atoms = obj.atoms
except AttributeError:
errmsg = "Input obj is neither an AtomGroup or Universe"
raise TypeError(errmsg) from None
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