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# 

# LSST Data Management System 

# Copyright 2008, 2009, 2010 LSST Corporation. 

# 

# This product includes software developed by the 

# LSST Project (http://www.lsst.org/). 

# 

# 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 3 of the License, or 

# (at your option) any later version. 

# 

# This program is distributed in the hope that it will be useful, 

# but WITHOUT ANY WARRANTY; without even the implied warranty of 

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

# GNU General Public License for more details. 

# 

# You should have received a copy of the LSST License Statement and 

# the GNU General Public License along with this program. If not, 

# see <http://www.lsstcorp.org/LegalNotices/>. 

# 

 

__all__ = ('makePropertySet', 'makePolicy') 

 

import lsst.pex.policy 

import lsst.daf.base 

 

 

def makePropertySet(config): 

"""Convert a configuration into a `lsst.daf.base.PropertySet`. 

 

Parameters 

---------- 

config : `lsst.pex.config.Config` 

Configuration instance. 

 

Returns 

------- 

propertySet : `lsst.daf.base.PropertySet` 

A `~lsst.daf.base.PropertySet` that is equivalent to the ``config`` 

instance. If ``config`` is `None` then this return value is also 

`None`. 

 

See also 

-------- 

makePolicy 

lsst.daf.base.PropertySet 

""" 

def _helper(ps, prefix, dict_): 

for k, v in dict_.items(): 

name = prefix + "." + k if prefix is not None else k 

if isinstance(v, dict): 

_helper(ps, name, v) 

elif v is not None: 

ps.set(name, v) 

 

if config is not None: 

ps = lsst.daf.base.PropertySet() 

_helper(ps, None, config.toDict()) 

return ps 

else: 

return None 

 

 

def makePolicy(config): 

"""Convert a configuration into a `lsst.pex.policy.Policy`. 

 

Parameters 

---------- 

config : `lsst.pex.config.Config` 

Configuration instance. 

 

Returns 

------- 

policy : `lsst.pex.policy.Policy` 

A `~lsst.pex.policy.Policy` that is equivalent to the ``config`` 

instance. If ``config`` is `None` then return value is also `None`. 

 

See also 

-------- 

makePropertySet 

lsst.pex.policy.Policy 

""" 

def _helper(dict_): 

p = lsst.pex.policy.Policy() 

for k, v in dict_.items(): 

if isinstance(v, dict): 

p.set(k, _helper(v)) 

elif isinstance(v, list): 

for vi in v: 

p.add(k, vi) 

elif v is not None: 

p.set(k, v) 

return p 

if config: 

return _helper(config.toDict()) 

else: 

return None