|
1
|
|
|
# ~*~ coding: utf-8 ~*~ |
|
2
|
|
|
#- |
|
3
|
|
|
# OSMAlchemy - OpenStreetMap to SQLAlchemy bridge |
|
4
|
|
|
# Copyright (c) 2016 Dominik George <[email protected]> |
|
5
|
|
|
# |
|
6
|
|
|
# Permission is hereby granted, free of charge, to any person obtaining a copy |
|
7
|
|
|
# of this software and associated documentation files (the "Software"), to deal |
|
8
|
|
|
# in the Software without restriction, including without limitation the rights |
|
9
|
|
|
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
|
10
|
|
|
# copies of the Software, and to permit persons to whom the Software is |
|
11
|
|
|
# furnished to do so, subject to the following conditions: |
|
12
|
|
|
# |
|
13
|
|
|
# The above copyright notice and this permission notice shall be included in all |
|
14
|
|
|
# copies or substantial portions of the Software. |
|
15
|
|
|
# |
|
16
|
|
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
|
17
|
|
|
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
|
18
|
|
|
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
|
19
|
|
|
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
|
20
|
|
|
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
|
21
|
|
|
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
|
22
|
|
|
# SOFTWARE. |
|
23
|
|
|
# |
|
24
|
|
|
# Alternatively, you are free to use OSMAlchemy under Simplified BSD, The |
|
25
|
|
|
# MirOS Licence, GPL-2+, LGPL-2.1+, AGPL-3+ or the same terms as Python |
|
26
|
|
|
# itself. |
|
27
|
|
|
|
|
28
|
|
|
""" Module that holds the main OSMAlchemy class. |
|
29
|
|
|
|
|
30
|
|
|
The classe encapsulates the model and accompanying logic. |
|
31
|
|
|
""" |
|
32
|
|
|
|
|
33
|
|
|
from .model import _generate_model |
|
34
|
|
|
|
|
35
|
|
|
class OSMAlchemy(object): |
|
36
|
|
|
""" Wrapper class for the OSMAlchemy model and logic |
|
37
|
|
|
|
|
38
|
|
|
This class holds all the SQLAlchemy classes and logic that make up |
|
39
|
|
|
OSMAlchemy. It is contained in a separate class because it is a |
|
40
|
|
|
template that can be modified as needed by users, e.g. by using a |
|
41
|
|
|
different table prefix or a different declarative base. |
|
42
|
|
|
""" |
|
43
|
|
|
|
|
44
|
|
|
def __init__(self, base=None, prefix="osm_"): |
|
45
|
|
|
""" Initialise the table definitions in the wrapper object |
|
46
|
|
|
|
|
47
|
|
|
This function generates the OSM element classes as SQLAlchemy table |
|
48
|
|
|
declaratives. If called without an argument, it uses a newly created |
|
49
|
|
|
declarative base. |
|
50
|
|
|
|
|
51
|
|
|
The base argument, if provided, can be either a declarative base or |
|
52
|
|
|
a Flask-SQLAlchemy object. |
|
53
|
|
|
""" |
|
54
|
|
|
|
|
55
|
|
|
# Check what we got as declarative base |
|
56
|
|
|
if base is None: |
|
57
|
|
|
# Nothing, so create one |
|
58
|
|
|
self._base = declarative_base() |
|
59
|
|
|
elif hasattr(base, "Model"): |
|
60
|
|
|
# Unwrap Flask-SQLAlchemy object if we got one |
|
61
|
|
|
self._base = base.Model |
|
62
|
|
|
else: |
|
63
|
|
|
self._base = base |
|
64
|
|
|
|
|
65
|
|
|
# Store prefix |
|
66
|
|
|
self._prefix = prefix |
|
67
|
|
|
|
|
68
|
|
|
# Generate model and store as instance members |
|
69
|
|
|
self.Node, self.Way, self.Relation = _generate_model(self._base, self._prefix) |
|
70
|
|
|
|
Natureshadow /
OSMAlchemy
