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#!/usr/bin/env python 

 

# 

# LSST Data Management System 

# Copyright 2016 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/>. 

# 

from collections import UserDict 

 

import copy 

 

 

class DataId(UserDict): 

"""DataId is used to pass scientifically meaningful key-value pairs. It may be tagged as applicable only 

to repositories that are tagged with the same value""" 

 

def __init__(self, initialdata=None, tag=None, **kwargs): 

"""Constructor 

 

Parameters 

----------- 

initialdata : dict or dataId 

A dict of initial data for the DataId 

tag : any type, or a container of any type 

A value or container of values used to restrict the DataId to one or more repositories that 

share that tag value. It will be stored in a set for comparison with the set of tags assigned to 

repositories. 

kwargs : any values 

key-value pairs to be used as part of the DataId's data. 

""" 

UserDict.__init__(self, initialdata) 

try: 

self.tag = copy.deepcopy(initialdata.tag) 

except AttributeError: 

self.tag = set() 

 

if tag is not None: 

if isinstance(tag, str): 

self.tag.update([tag]) 

else: 

try: 

self.tag.update(tag) 

except TypeError: 

self.tag.update([tag]) 

 

self.data.update(kwargs) 

 

def __repr__(self): 

return "DataId(initialdata=%s, tag=%s)" % (self.data.__repr__(), self.tag)