def test_not_tuple(self):
"""The function fails when one of the slices is not a tuple."""
slice1 = 0
slice2 = (0,)
with self.assertRaises(TypeError):
combine_slices(slice1, slice2)
with self.assertRaises(TypeError):
combine_slices(slice2, slice1)
def test_not_tuple(self):
"""The function fails when one of the slices is not a tuple."""
slice1 = 0
slice2 = (0, )
with self.assertRaises(TypeError):
combined = combine_slices(slice1, slice2)
with self.assertRaises(TypeError):
combined = combine_slices(slice2, slice1)
def __getitem__(self, index):
slice_ = combine_slices(self._slice, fix_slice(index, self.shape))
scheme, netloc, path, query, fragment = urlsplit(self.url)
url = urlunsplit((scheme, netloc, path + '.dods',
self.id + hyperslab(slice_) + '&' + query, fragment))
resp, data = request(url)
dds, xdrdata = data.split('\nData:\n', 1)
dataset = DDSParser(dds).parse()
data = data2 = DapUnpacker(xdrdata, dataset).getvalue()
# Retrieve the data from any parent structure(s).
for var in walk(dataset):
if type(var) in (StructureType, DatasetType):
data = data[0]
elif var.id == self.id:
return data
# Some old servers return the wrong response. :-/
# I found a server that would return an array to a request
# for an array inside a grid (instead of a structure with
# the array); this will take care of it.
for var in walk(dataset):
if type(var) in (StructureType, DatasetType):
data2 = data2[0]
elif self.id.endswith(var.id):
return data2
def __getitem__(self, key):
out = self.clone()
# return the data for a children
if isinstance(key, basestring):
out.id = '{id}.{child}'.format(id=self.id, child=key)
def get_child(descr):
mapping = dict((d[0], d) for d in descr)
return mapping[key]
out.descr = apply_to_list(get_child, out.descr)
# return a new object with requested columns
elif isinstance(key, list):
def get_children(descr):
mapping = dict((d[0], d) for d in descr)
return [mapping[k] for k in key]
out.descr = apply_to_list(get_children, out.descr)
# return a copy with the added constraints
elif isinstance(key, ConstraintExpression):
out.selection.extend( str(key).split('&') )
# slice data
else:
if isinstance(key, int):
key = slice(key, key+1)
out.slice = combine_slices(self.slice, (key,))
return out
def __getitem__(self, key):
out = self.clone()
# return the data for a children
if isinstance(key, basestring):
out.id = '{id}.{child}'.format(id=self.id, child=key)
def get_child(descr):
mapping = dict((d[0], d) for d in descr)
return mapping[key]
out.descr = apply_to_list(get_child, out.descr)
# return a new object with requested columns
elif isinstance(key, list):
def get_children(descr):
mapping = dict((d[0], d) for d in descr)
return [mapping[k] for k in key]
out.descr = apply_to_list(get_children, out.descr)
# return a copy with the added constraints
elif isinstance(key, ConstraintExpression):
out.selection.extend(str(key).split('&'))
# slice data
else:
if isinstance(key, int):
key = slice(key, key + 1)
out.slice = combine_slices(self.slice, (key, ))
return out
def __getitem__(self, index):
slice_ = combine_slices(self._slice, fix_slice(index, self.shape))
scheme, netloc, path, query, fragment = urlsplit(self.url)
url = urlunsplit((
scheme, netloc, path + '.dods',
quote(self.id) + hyperslab(slice_) + '&' + query,
fragment))
resp, data = request(url)
dds, xdrdata = data.split('\nData:\n', 1)
dataset = DDSParser(dds).parse()
data = data2 = DapUnpacker(xdrdata, dataset).getvalue()
# Retrieve the data from any parent structure(s).
for var in walk(dataset):
if type(var) in (StructureType, DatasetType):
data = data[0]
elif var.id == self.id:
return data
# Some old servers return the wrong response. :-/
# I found a server that would return an array to a request
# for an array inside a grid (instead of a structure with
# the array); this will take care of it.
for var in walk(dataset):
if type(var) in (StructureType, DatasetType):
data2 = data2[0]
elif self.id.endswith(var.id):
return data2
def __getitem__(self, index):
# build download url
index = combine_slices(self.slice, fix_slice(index, self.shape))
scheme, netloc, path, query, fragment = urlsplit(self.baseurl)
url = urlunsplit(
(scheme, netloc, path + '.dods',
self.id + hyperslab(index) + '&' + query, fragment)).rstrip('&')
# download and unpack data
r = requests.get(url)
dds, data = r.content.split('\nData:\n', 1)
if self.shape:
# skip size packing
if self.dtype.char == 'S':
data = data[4:]
else:
data = data[8:]
# calculate array size
shape = tuple((s.stop - s.start) / s.step for s in index)
size = np.prod(shape)
if self.dtype == np.byte:
return np.fromstring(data[:size], 'B')
elif self.dtype.char == 'S':
out = []
for word in range(size):
n = np.fromstring(data[:4], '>I') # read length
data = data[4:]
out.append(data[:n])
data = data[n + (-n % 4):]
return np.array(out, 'S')
else:
return np.fromstring(data, self.dtype).reshape(shape)
def test_integer(self):
"""Test slices that are just integers."""
x = np.arange(10)
slice1 = (0, )
slice2 = (1, )
combined = combine_slices(slice1, slice2)
self.assertEqual(combined, (slice(1, 1, 1), ))
def test_all_values(self):
"""Test when start and stop are all integers."""
x = np.arange(20)
slice1 = (slice(0, 8), )
slice2 = (slice(5, 6), )
combined = combine_slices(slice1, slice2)
self.assertEqual(combined, (slice(5, 6, 1), ))
np.testing.assert_array_equal(x[combined], x[slice1][slice2])
def test_second_stop_none(self):
"""Test when the second slice has ``None`` for stop."""
x = np.arange(10)
slice1 = (slice(0, 8), )
slice2 = (slice(5, None), )
combined = combine_slices(slice1, slice2)
self.assertEqual(combined, (slice(5, 8, 1), ))
np.testing.assert_array_equal(x[combined], x[slice1][slice2])
def test_stops_none(self):
"""Test when both of the slices have ``None`` for stop."""
x = np.arange(10)
slice1 = (slice(0, None), )
slice2 = (slice(5, None), )
combined = combine_slices(slice1, slice2)
self.assertEqual(combined, (slice(5, None, 1), ))
np.testing.assert_array_equal(x[combined], x[slice1][slice2])
def test_all_values(self):
"""Test when start and stop are all integers."""
x = np.arange(20)
slice1 = (slice(0, 8),)
slice2 = (slice(5, 6),)
combined = combine_slices(slice1, slice2)
self.assertEqual(combined, (slice(5, 6, 1),))
np.testing.assert_array_equal(x[combined], x[slice1][slice2])
def test_second_stop_none(self):
"""Test when the second slice has ``None`` for stop."""
x = np.arange(10)
slice1 = (slice(0, 8),)
slice2 = (slice(5, None),)
combined = combine_slices(slice1, slice2)
self.assertEqual(combined, (slice(5, 8, 1),))
np.testing.assert_array_equal(x[combined], x[slice1][slice2])
def test_stops_none(self):
"""Test when both of the slices have ``None`` for stop."""
x = np.arange(10)
slice1 = (slice(0, None),)
slice2 = (slice(5, None),)
combined = combine_slices(slice1, slice2)
self.assertEqual(combined, (slice(5, None, 1),))
np.testing.assert_array_equal(x[combined], x[slice1][slice2])
def __getitem__(self, index):
# build download url
index = combine_slices(self.slice, fix_slice(index, self.shape))
scheme, netloc, path, query, fragment = urlsplit(self.baseurl)
url = urlunsplit(
(scheme, netloc, path + ".dods", quote(self.id) + hyperslab(index) + "&" + query, fragment)
).rstrip("&")
# download and unpack data
logger.info("Fetching URL: %s" % url)
r = GET(url, self.application, self.session)
raise_for_status(r)
dds, data = r.body.split(b"\nData:\n", 1)
dds = dds.decode(r.content_encoding or "ascii")
if self.shape:
# skip size packing
if self.dtype.char in "SU":
data = data[4:]
else:
data = data[8:]
# calculate array size
shape = tuple(int(np.ceil((s.stop - s.start) / float(s.step))) for s in index)
size = int(np.prod(shape))
if self.dtype == np.byte:
return np.fromstring(data[:size], "B").reshape(shape)
elif self.dtype.char in "SU":
out = []
for word in range(size):
n = np.asscalar(np.fromstring(data[:4], ">I")) # read length
data = data[4:]
out.append(data[:n])
data = data[n + (-n % 4) :]
return np.array([text_type(x.decode("ascii")) for x in out], "S").reshape(shape)
else:
try:
return np.fromstring(data, self.dtype).reshape(shape)
except ValueError as e:
if str(e) == "total size of new array must be unchanged":
# server-side failure.
# it is expected that the user should be mindful of this:
raise RuntimeError(
(
"variable {0} could not be properly "
"retrieved. To avoid this "
"error consider using open_url(..., "
"output_grid=False)."
).format(quote(self.id))
)
else:
raise
def __getitem__(self, index):
# build download url
index = combine_slices(self.slice, fix_slice(index, self.shape))
scheme, netloc, path, query, fragment = urlsplit(self.baseurl)
url = urlunsplit((
scheme, netloc, path + '.dods',
quote(self.id) + hyperslab(index) + '&' + query,
fragment)).rstrip('&')
# download and unpack data
logger.info("Fetching URL: %s" % url)
r = GET(url, self.application, self.session)
raise_for_status(r)
dds, data = r.body.split(b'\nData:\n', 1)
dds = dds.decode(r.content_encoding or 'ascii')
if self.shape:
# skip size packing
if self.dtype.char in 'SU':
data = data[4:]
else:
data = data[8:]
# calculate array size
shape = tuple(
int(np.ceil((s.stop-s.start)/float(s.step))) for s in index)
size = int(np.prod(shape))
if self.dtype == np.byte:
return np.fromstring(data[:size], 'B').reshape(shape)
elif self.dtype.char in 'SU':
out = []
for word in range(size):
n = np.asscalar(np.fromstring(data[:4], '>I')) # read length
data = data[4:]
out.append(data[:n])
data = data[n + (-n % 4):]
return np.array([text_type(x.decode('ascii'))
for x in out], 'S').reshape(shape)
else:
try:
return np.fromstring(data, self.dtype).reshape(shape)
except ValueError as e:
if str(e) == 'total size of new array must be unchanged':
# server-side failure.
# it is expected that the user should be mindful of this:
raise RuntimeError(
('variable {0} could not be properly '
'retrieved. To avoid this '
'error consider using open_url(..., '
'output_grid=False).').format(quote(self.id)))
else:
raise
def __getitem__(self, index):
"""
Download data for all the tiles containing the request.
"""
slice_ = combine_slices(self._slice, fix_slice(index, self.shape))
requested = self.parse_request(slice_)
with self.lock.readlock:
needed = requested & ~self.index[:]
# update cache with needed data
with self.lock.writelock:
for tile in self.get_tiles(needed):
self.cache[tile] = super(CachingArrayProxy, self).__getitem__(tile)
# update index with newly requested data
self.index[:] = self.index[:] | needed
return self.cache[slice_]
def __getitem__(self, index):
"""
Download data for all the tiles containing the request.
"""
slice_ = combine_slices(self._slice, fix_slice(index, self.shape))
requested = self.parse_request(slice_)
with self.lock.readlock:
needed = requested & ~self.index[:]
# update cache with needed data
with self.lock.writelock:
for tile in self.get_tiles(needed):
self.cache[tile] = super(CachingArrayProxy, self).__getitem__(tile)
# update index with newly requested data
self.index[:] = self.index[:] | needed
return self.cache[slice_]
def __getitem__(self, index):
# build download url
index = combine_slices(self.slice, fix_slice(index, self.shape))
scheme, netloc, path, query, fragment = urlsplit(self.baseurl)
url = urlunsplit((
scheme, netloc, path + '.dods',
quote(self.id) + hyperslab(index) + '&' + query,
fragment)).rstrip('&')
# download and unpack data
logger.info("Fetching URL: %s" % url)
r = GET(url, self.application, self.session)
raise_for_status(r)
dds, data = r.body.split(b'\nData:\n', 1)
dds = dds.decode(r.content_encoding or 'ascii')
if self.shape:
# skip size packing
if self.dtype.char in 'SU':
data = data[4:]
else:
data = data[8:]
# calculate array size
shape = tuple(
int(np.ceil((s.stop-s.start)/float(s.step))) for s in index)
size = int(np.prod(shape))
if self.dtype == np.byte:
return np.fromstring(data[:size], 'B')
elif self.dtype.char in 'SU':
out = []
for word in range(size):
n = np.fromstring(data[:4], '>I') # read length
data = data[4:]
out.append(data[:n])
data = data[n + (-n % 4):]
return np.array([ text_type(x.decode('ascii')) for x in out ], 'S')
else:
return np.fromstring(data, self.dtype).reshape(shape)
def __getitem__(self, key):
out = copy.deepcopy(self)
if isinstance(key, ConstraintExpression):
scheme, netloc, path, query, fragment = urlsplit(self.url)
out.url = urlunsplit((
scheme, netloc, path, str(key & query), fragment))
if out._slice != (slice(None),):
warnings.warn('Selection %s will be applied before projection "%s".' % (
key, hyperslab(out._slice)))
elif isinstance(key, basestring):
out._slice = (slice(None),)
out.children = ()
parent = self.id
if ',' in parent:
parent = parent.split(',', 1)[0].rsplit('.', 1)[0]
out.id = '%s%s.%s' % (parent, hyperslab(self._slice), key)
elif isinstance(key, tuple):
out.children = key[:]
else:
out._slice = combine_slices(self._slice, fix_slice(key, (sys.maxint,)))
return out
def __getitem__(self, key):
out = self.clone()
# return the data for a children
if isinstance(key, basestring):
out.id = '{id}.{child}'.format(id=self.id, child=key)
out.cols = key
# return a new object with requested columns
elif isinstance(key, list):
out.cols = tuple(key)
# return a copy with the added constraints
elif isinstance(key, ConstraintExpression):
out.selection.extend( str(key).split('&') )
# slice data
else:
if isinstance(key, int):
key = slice(key, key+1)
out.slice = combine_slices(self.slice, (key,))
return out
def __getitem__(self, index):
# build download url
index = combine_slices(self.slice, fix_slice(index, self.shape))
scheme, netloc, path, query, fragment = urlsplit(self.baseurl)
url = urlunsplit((
scheme, netloc, path + '.dods',
self.id + hyperslab(index) + '&' + query,
fragment)).rstrip('&')
# download and unpack data
r = requests.get(url)
r.raise_for_status()
dds, data = r.content.split('\nData:\n', 1)
if self.shape:
# skip size packing
if self.dtype.char == 'S':
data = data[4:]
else:
data = data[8:]
# calculate array size
shape = tuple((s.stop-s.start)/s.step for s in index)
size = np.prod(shape)
if self.dtype == np.byte:
return np.fromstring(data[:size], 'B')
elif self.dtype.char == 'S':
out = []
for word in range(size):
n = np.fromstring(data[:4], '>I') # read length
data = data[4:]
out.append(data[:n])
data = data[n + (-n % 4):]
return np.array(out, 'S')
else:
return np.fromstring(data, self.dtype).reshape(shape)
def __getitem__(self, key):
"""Return a new object representing a subset of the data."""
out = copy.copy(self)
# return the data for a children
if isinstance(key, string_types):
out.template = out.template[key]
# return a new object with requested columns
elif isinstance(key, list):
out.sub_children = True
out.template._keys = key
# return a copy with the added constraints
elif isinstance(key, ConstraintExpression):
out.selection.extend(str(key).split('&'))
# slice data
else:
if isinstance(key, int):
key = slice(key, key + 1)
out.slice = combine_slices(self.slice, (key, ))
return out
def __getitem__(self, key):
out = copy.deepcopy(self)
if isinstance(key, ConstraintExpression):
scheme, netloc, path, query, fragment = urlsplit(self.url)
out.url = urlunsplit(
(scheme, netloc, path, str(key & query), fragment))
if out._slice != (slice(None), ):
warnings.warn(
'Selection %s will be applied before projection "%s".' %
(key, hyperslab(out._slice)))
elif isinstance(key, basestring):
out._slice = (slice(None), )
out.children = ()
parent = self.id
if ',' in parent:
parent = parent.split(',', 1)[0].rsplit('.', 1)[0]
out.id = '%s%s.%s' % (parent, hyperslab(self._slice), key)
elif isinstance(key, tuple):
out.children = key[:]
else:
out._slice = combine_slices(self._slice,
fix_slice(key, (sys.maxint, )))
return out
def __getitem__(self, key):
"""Return a new object representing a subset of the data."""
out = copy.copy(self)
# return the data for a children
if isinstance(key, string_types):
out.template = out.template[key]
# return a new object with requested columns
elif isinstance(key, list):
out.sub_children = True
out.template._keys = key
# return a copy with the added constraints
elif isinstance(key, ConstraintExpression):
out.selection.extend(str(key).split("&"))
# slice data
else:
if isinstance(key, int):
key = slice(key, key + 1)
out.slice = combine_slices(self.slice, (key,))
return out
def test_integer(self):
"""Test slices that are just integers."""
slice1 = (0,)
slice2 = (1,)
combined = combine_slices(slice1, slice2)
self.assertEqual(combined, (slice(1, 1, 1),))
