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     23 
     24 import urllib
     25 import zipfile
     26 
     27 from webkitpy.common.net.networktransaction import NetworkTransaction
     28 from webkitpy.common.system.fileset import FileSetFileHandle
     29 from webkitpy.common.system.filesystem import FileSystem
     30 
     31 
     32 class ZipFileSet(object):
     33     """The set of files in a zip file that resides at a URL (local or remote)"""
     34     def __init__(self, zip_url, filesystem=None, zip_factory=None):
     35         self._zip_url = zip_url
     36         self._temp_file = None
     37         self._zip_file = None
     38         self._filesystem = filesystem or FileSystem()
     39         self._zip_factory = zip_factory or self._retrieve_zip_file
     40 
     41     def _retrieve_zip_file(self, zip_url):
     42         temp_file = NetworkTransaction().run(lambda: urllib.urlretrieve(zip_url)[0])
     43         return (temp_file, zipfile.ZipFile(temp_file))
     44 
     45     def _load(self):
     46         if self._zip_file is None:
     47             self._temp_file, self._zip_file = self._zip_factory(self._zip_url)
     48 
     49     def open(self, filename):
     50         self._load()
     51         return FileSetFileHandle(self, filename, self._filesystem)
     52 
     53     def close(self):
     54         if self._temp_file:
     55             self._filesystem.remove(self._temp_file)
     56             self._temp_file = None
     57 
     58     def namelist(self):
     59         self._load()
     60         return self._zip_file.namelist()
     61 
     62     def read(self, filename):
     63         self._load()
     64         return self._zip_file.read(filename)
     65 
     66     def extract(self, filename, path):
     67         self._load()
     68         self._zip_file.extract(filename, path)
     69 
     70     def delete(self, filename):
     71         raise Exception("Can't delete from a ZipFileSet.")
     72