author | Sverre Rabbelier <srabbelier@gmail.com> |
Sun, 07 Dec 2008 17:02:10 +0000 | |
changeset 705 | 0ab17e14df95 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
323
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
1 |
from django.contrib.syndication.feeds import Feed as BaseFeed, FeedDoesNotExist |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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2 |
from django.utils.feedgenerator import Atom1Feed, Rss201rev2Feed |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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3 |
|
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4 |
class GeoFeedMixin(object): |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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5 |
""" |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
6 |
This mixin provides the necessary routines for SyndicationFeed subclasses |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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7 |
to produce simple GeoRSS or W3C Geo elements. |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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8 |
""" |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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9 |
|
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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10 |
def georss_coords(self, coords): |
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parents:
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11 |
""" |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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12 |
In GeoRSS coordinate pairs are ordered by lat/lon and separated by |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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13 |
a single white space. Given a tuple of coordinates, this will return |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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14 |
a unicode GeoRSS representation. |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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15 |
""" |
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16 |
return u' '.join([u'%f %f' % (coord[1], coord[0]) for coord in coords]) |
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parents:
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17 |
|
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parents:
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18 |
def add_georss_point(self, handler, coords, w3c_geo=False): |
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19 |
""" |
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parents:
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20 |
Adds a GeoRSS point with the given coords using the given handler. |
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parents:
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21 |
Handles the differences between simple GeoRSS and the more pouplar |
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parents:
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22 |
W3C Geo specification. |
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parents:
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23 |
""" |
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parents:
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24 |
if w3c_geo: |
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25 |
lon, lat = coords[:2] |
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26 |
handler.addQuickElement(u'geo:lat', u'%f' % lat) |
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27 |
handler.addQuickElement(u'geo:lon', u'%f' % lon) |
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28 |
else: |
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29 |
handler.addQuickElement(u'georss:point', self.georss_coords((coords,))) |
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30 |
|
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31 |
def add_georss_element(self, handler, item, w3c_geo=False): |
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32 |
""" |
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33 |
This routine adds a GeoRSS XML element using the given item and handler. |
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34 |
""" |
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parents:
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35 |
# Getting the Geometry object. |
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36 |
geom = item.get('geometry', None) |
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37 |
if not geom is None: |
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parents:
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38 |
if isinstance(geom, (list, tuple)): |
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parents:
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39 |
# Special case if a tuple/list was passed in. The tuple may be |
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parents:
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40 |
# a point or a box |
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parents:
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41 |
box_coords = None |
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parents:
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42 |
if isinstance(geom[0], (list, tuple)): |
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parents:
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43 |
# Box: ( (X0, Y0), (X1, Y1) ) |
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parents:
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44 |
if len(geom) == 2: |
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parents:
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45 |
box_coords = geom |
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parents:
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46 |
else: |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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47 |
raise ValueError('Only should be two sets of coordinates.') |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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48 |
else: |
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parents:
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49 |
if len(geom) == 2: |
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parents:
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50 |
# Point: (X, Y) |
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parents:
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51 |
self.add_georss_point(handler, geom, w3c_geo=w3c_geo) |
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parents:
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52 |
elif len(geom) == 4: |
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parents:
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53 |
# Box: (X0, Y0, X1, Y1) |
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parents:
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54 |
box_coords = (geom[:2], geom[2:]) |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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55 |
else: |
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parents:
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56 |
raise ValueError('Only should be 2 or 4 numeric elements.') |
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parents:
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57 |
# If a GeoRSS box was given via tuple. |
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parents:
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58 |
if not box_coords is None: |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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59 |
if w3c_geo: raise ValueError('Cannot use simple GeoRSS box in W3C Geo feeds.') |
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parents:
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60 |
handler.addQuickElement(u'georss:box', self.georss_coords(box_coords)) |
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parents:
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61 |
else: |
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parents:
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62 |
# Getting the lower-case geometry type. |
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parents:
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63 |
gtype = str(geom.geom_type).lower() |
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parents:
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64 |
if gtype == 'point': |
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parents:
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65 |
self.add_georss_point(handler, geom.coords, w3c_geo=w3c_geo) |
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parents:
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66 |
else: |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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67 |
if w3c_geo: raise ValueError('W3C Geo only supports Point geometries.') |
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parents:
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68 |
# For formatting consistent w/the GeoRSS simple standard: |
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parents:
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69 |
# http://georss.org/1.0#simple |
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parents:
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70 |
if gtype in ('linestring', 'linearring'): |
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71 |
handler.addQuickElement(u'georss:line', self.georss_coords(geom.coords)) |
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parents:
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72 |
elif gtype in ('polygon',): |
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parents:
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73 |
# Only support the exterior ring. |
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parents:
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74 |
handler.addQuickElement(u'georss:polygon', self.georss_coords(geom[0].coords)) |
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parents:
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75 |
else: |
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76 |
raise ValueError('Geometry type "%s" not supported.' % geom.geom_type) |
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parents:
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77 |
|
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parents:
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78 |
### SyndicationFeed subclasses ### |
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79 |
class GeoRSSFeed(Rss201rev2Feed, GeoFeedMixin): |
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parents:
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80 |
def rss_attributes(self): |
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81 |
attrs = super(GeoRSSFeed, self).rss_attributes() |
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82 |
attrs[u'xmlns:georss'] = u'http://www.georss.org/georss' |
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83 |
return attrs |
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84 |
|
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parents:
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85 |
def add_item_elements(self, handler, item): |
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parents:
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86 |
super(GeoRSSFeed, self).add_item_elements(handler, item) |
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parents:
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87 |
self.add_georss_element(handler, item) |
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parents:
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88 |
|
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89 |
def add_root_elements(self, handler): |
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parents:
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90 |
super(GeoRSSFeed, self).add_root_elements(handler) |
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parents:
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91 |
self.add_georss_element(handler, self.feed) |
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parents:
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92 |
|
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93 |
class GeoAtom1Feed(Atom1Feed, GeoFeedMixin): |
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parents:
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94 |
def root_attributes(self): |
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parents:
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95 |
attrs = super(GeoAtom1Feed, self).root_attributes() |
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parents:
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96 |
attrs[u'xmlns:georss'] = u'http://www.georss.org/georss' |
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97 |
return attrs |
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98 |
|
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parents:
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99 |
def add_item_elements(self, handler, item): |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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100 |
super(GeoAtom1Feed, self).add_item_elements(handler, item) |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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101 |
self.add_georss_element(handler, item) |
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parents:
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102 |
|
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parents:
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103 |
def add_root_elements(self, handler): |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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104 |
super(GeoAtom1Feed, self).add_root_elements(handler) |
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Load ../vendor/django into trunk/app/django.
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self.add_georss_element(handler, self.feed) |
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106 |
|
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107 |
class W3CGeoFeed(Rss201rev2Feed, GeoFeedMixin): |
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108 |
def rss_attributes(self): |
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109 |
attrs = super(W3CGeoFeed, self).rss_attributes() |
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110 |
attrs[u'xmlns:geo'] = u'http://www.w3.org/2003/01/geo/wgs84_pos#' |
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111 |
return attrs |
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112 |
|
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113 |
def add_item_elements(self, handler, item): |
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114 |
super(W3CGeoFeed, self).add_item_elements(handler, item) |
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115 |
self.add_georss_element(handler, item, w3c_geo=True) |
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116 |
|
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117 |
def add_root_elements(self, handler): |
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118 |
super(W3CGeoFeed, self).add_root_elements(handler) |
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119 |
self.add_georss_element(handler, self.feed, w3c_geo=True) |
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120 |
|
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121 |
### Feed subclass ### |
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122 |
class Feed(BaseFeed): |
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123 |
""" |
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124 |
This is a subclass of the `Feed` from `django.contrib.syndication`. |
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125 |
This allows users to define a `geometry(obj)` and/or `item_geometry(item)` |
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126 |
methods on their own subclasses so that geo-referenced information may |
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127 |
placed in the feed. |
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128 |
""" |
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129 |
feed_type = GeoRSSFeed |
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130 |
|
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131 |
def feed_extra_kwargs(self, obj): |
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132 |
return {'geometry' : self.__get_dynamic_attr('geometry', obj)} |
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133 |
|
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134 |
def item_extra_kwargs(self, item): |
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135 |
return {'geometry' : self.__get_dynamic_attr('item_geometry', item)} |