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# This file is part of dax_ppdb. 

# 

# Developed for the LSST Data Management System. 

# This product includes software developed by the LSST Project 

# (http://www.lsst.org). 

# See the COPYRIGHT file at the top-level directory of this distribution 

# for details of code ownership. 

# 

# 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 GNU General Public License 

# along with this program. If not, see <http://www.gnu.org/licenses/>. 

 

"""Contains convenience functions for accessing data from the Ppdb for use in 

ApVerify. 

""" 

 

__all__ = ["countUnassociatedObjects", "isVisitProcessed"] 

 

from sqlalchemy import (func, sql) 

 

 

def countUnassociatedObjects(ppdb): 

"""Return the number of DiaObjects that have only one DiaSource associated 

with them. 

 

Parameters 

---------- 

ppdb : `lsst.dax.ppdb.Ppdb` 

Ppdb object connected to an instantiated database. 

 

Returns 

------- 

count : `int` 

Number of DiaObjects with exactly one associated DiaSource. 

""" 

# Retrieve the DiaObject table. 

table = ppdb._schema.objects 

 

# Construct the sql statement. 

stmt = sql.select([func.count()]).select_from(table).where(table.c.nDiaSources == 1) 

stmt = stmt.where(table.c.validityEnd == None) # noqa: E711 

 

# Return the count. 

count = ppdb._engine.scalar(stmt) 

 

return count 

 

 

def isVisitProcessed(ppdb, visitInfo): 

"""Test whether data from an image has been loaded into the database. 

 

Parameters 

---------- 

ppdb : `lsst.dax.ppdb.Ppdb` 

Ppdb object connected to an instantiated database. 

visitInfo : `lsst.afw.image.VisitInfo` 

The metadata for the image of interest. 

 

Returns 

------- 

isProcessed : `bool` 

`True` if the data are present, `False` otherwise. 

""" 

id = visitInfo.getExposureId() 

table = ppdb._schema.sources 

idField = table.c.ccdVisitId 

 

# Hopefully faster than SELECT DISTINCT 

query = sql.select([idField]).select_from(table) \ 

.where(idField == id).limit(1) 

 

return ppdb._engine.scalar(query) is not None