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"""
***************************************************************************
r_drain.py
----------
Date : February 2016
Copyright : (C) 2016 by Médéric Ribreux
Email : medspx at medspx dot fr
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************
"""
__author__ = "Médéric Ribreux"
__date__ = "February 2016"
__copyright__ = "(C) 2016, Médéric Ribreux"
from qgis.PyQt.QtCore import QCoreApplication
def checkParameterValuesBeforeExecuting(alg, parameters, context):
"""Verify if we have the right parameters"""
# start_coordinates and start_points are mutually exclusives
if alg.parameterAsString(
parameters, "start_coordinates", context
) and alg.parameterAsVectorLayer(parameters, "start_points", context):
return False, QCoreApplication.translate(
"GrassAlgorithmExt",
"You need to set either start coordinates OR a start points vector layer!",
)
# You need to set at least one parameter
if not alg.parameterAsString(
parameters, "start_coordinates", context
) and not alg.parameterAsVectorLayer(parameters, "start_points", context):
return False, QCoreApplication.translate(
"GrassAlgorithmExt",
"You need to set either start coordinates OR a start points vector layer!",
)
paramscore = [
f for f in ["-c", "-a", "-n"] if alg.parameterAsBoolean(parameters, f, context)
]
if len(paramscore) > 1:
return False, QCoreApplication.translate(
"GrassAlgorithmExt", "-c, -a, -n parameters are mutually exclusive!"
)
return True, None
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