/usr/lib/python2.7/dist-packages/imposm/parser/simple.py is in python-imposm-parser 1.0.7+ds-4.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 | # Copyright 2011 Omniscale GmbH & Co. KG
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import with_statement
import multiprocessing
import sys
import time
from Queue import Empty
from imposm.parser.util import default_concurrency, fileinput, setproctitle
class OSMParser(object):
"""
High-level OSM parser.
:param concurrency:
number of parser processes to start. Defaults to the number of CPUs.
:param xxx_callback:
callback functions for coords, nodes, ways and relations.
Each callback function gets called with a list of multiple elements.
See :ref:`callback concepts <concepts_callbacks>`.
:param xxx_filter:
functions that can manipulate the tag dictionary.
Nodes and relations without tags will not passed to the callback.
See :ref:`tag filter concepts <concepts_tag_filters>`.
"""
def __init__(self, concurrency=None, nodes_callback=None, ways_callback=None,
relations_callback=None, coords_callback=None, nodes_tag_filter=None,
ways_tag_filter=None, relations_tag_filter=None, marshal_elem_data=False):
self.concurrency = concurrency or default_concurrency()
assert self.concurrency >= 1
self.nodes_callback = nodes_callback
self.ways_callback = ways_callback
self.relations_callback = relations_callback
self.coords_callback = coords_callback
self.nodes_tag_filter = nodes_tag_filter
self.ways_tag_filter = ways_tag_filter
self.relations_tag_filter = relations_tag_filter
self.marshal_elem_data = marshal_elem_data
def parse(self, filename):
"""
Parse the given file. Detects the filetype based on the file suffix.
Supports ``.pbf``, ``.osm`` and ``.osm.bz2``.
"""
if filename.endswith('.pbf'):
return self.parse_pbf_file(filename)
elif filename.endswith(('.osm', '.osm.bz2')):
return self.parse_xml_file(filename)
else:
raise NotImplementedError('unknown file extension')
def parse_pbf_file(self, filename):
"""
Parse a PBF file.
"""
from imposm.parser.pbf.multiproc import PBFMultiProcParser
return self._parse(filename, PBFMultiProcParser)
def parse_xml_file(self, filename):
"""
Parse a XML file.
Supports BZip2 compressed files if the filename ends with ``.bz2``.
"""
from imposm.parser.xml.multiproc import XMLMultiProcParser
with fileinput(filename) as input:
return self._parse(input, XMLMultiProcParser)
def _parse(self, input, parser_class):
queues_callbacks = {}
if self.coords_callback:
queues_callbacks['coords'] = (multiprocessing.JoinableQueue(512),
self.coords_callback)
if self.nodes_callback:
queues_callbacks['nodes'] = (multiprocessing.JoinableQueue(128),
self.nodes_callback)
if self.ways_callback:
queues_callbacks['ways'] = (multiprocessing.JoinableQueue(128),
self.ways_callback)
if self.relations_callback:
queues_callbacks['relations'] = (multiprocessing.JoinableQueue(128),
self.relations_callback)
def parse_it():
setproctitle('imposm parser')
queues = dict([(type, q) for type, (q, c) in queues_callbacks.items()])
parser = parser_class(self.concurrency,
ways_queue=queues.get('ways'),
coords_queue=queues.get('coords'),
nodes_queue=queues.get('nodes'),
relations_queue=queues.get('relations'),
marshal_elem_data=self.marshal_elem_data
)
parser.nodes_tag_filter = self.nodes_tag_filter
parser.ways_tag_filter = self.ways_tag_filter
parser.relations_tag_filter = self.relations_tag_filter
parser.parse(input)
for q in queues.values():
q.put(None)
proc = multiprocessing.Process(target=parse_it)
proc.start()
while queues_callbacks:
processed = False
for items_type, (queue, callback) in queues_callbacks.items():
try:
items = None
while True:
items = queue.get_nowait()
if items is None:
queue.task_done()
del queues_callbacks[items_type]
break
else:
callback(items)
if items:
processed = True
except Empty:
pass
if not processed:
# wait a ms if all queues were empty
# to give the parser a chance to fill them up
time.sleep(0.001)
proc.join()
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