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# Copyright 2015 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import os
class LocalPathInfo(object):
def __init__(self, path_priority_groups):
"""Container for a set of local file paths where a given dependency
can be stored.
Organized as a list of groups, where each group is itself a file path list.
See GetLocalPath() to understand how they are used.
Args:
path_priority_groups: Can be either None, or a list of file path
strings (corresponding to a list of groups, where each group has
a single file path), or a list of a list of file path strings
(i.e. a list of groups).
"""
self._path_priority_groups = self._ParseLocalPaths(path_priority_groups)
def GetLocalPath(self):
"""Look for a local file, and return its path.
Looks for the first group which has at least one existing file path. Then
returns the most-recent of these files.
Returns:
Local file path, if found, or None otherwise.
"""
for priority_group in self._path_priority_groups:
priority_group = [g for g in priority_group if os.path.exists(g)]
if not priority_group:
continue
return max(priority_group, key=lambda path: os.stat(path).st_mtime)
return None
def IsPathInLocalPaths(self, path):
"""Returns true if |path| is in one of this instance's file path lists."""
return any(
path in priority_group for priority_group in self._path_priority_groups)
def Update(self, local_path_info):
"""Update this object from the content of another LocalPathInfo instance.
Any file path from |local_path_info| that is not already contained in the
current instance will be added into new groups to it.
Args:
local_path_info: Another LocalPathInfo instance, or None.
"""
if not local_path_info:
return
for priority_group in local_path_info._path_priority_groups:
group_list = []
for path in priority_group:
if not self.IsPathInLocalPaths(path):
group_list.append(path)
if group_list:
self._path_priority_groups.append(group_list)
@staticmethod
def _ParseLocalPaths(local_paths):
if not local_paths:
return []
return [[e] if isinstance(e, basestring) else e for e in local_paths]
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