Source Code for Module entropy.spm.plugins.factory

 1  # -*- coding: utf-8 -*- 
 2  """ 
 3   
 4      @author: Fabio Erculiani <lxnay@sabayonlinux.org> 
 5      @contact: lxnay@sabayonlinux.org 
 6      @copyright: Fabio Erculiani 
 7      @license: GPL-2 
 8   
 9      B{Entropy Source Package Manager Plugins factory module}. 
10   
11  """ 
12  from entropy.const import etpConst 
13  from entropy.core import EntropyPluginFactory 
14  from entropy.core.settings.base import SystemSettings 
15  from entropy.i18n import _ 
16  from entropy.spm.plugins.skel import SpmPlugin 
17  import entropy.spm.plugins.interfaces as plugs 
18   
19  _settings = SystemSettings() 
20  _USER_PLUG = _settings['system'].get('spm_backend') 
21   
22  FACTORY = EntropyPluginFactory(SpmPlugin, plugs, 
23      default_plugin_name = _USER_PLUG) 
24   
25  get_available_plugins = FACTORY.get_available_plugins 
26   
27 -def get_default_class(): 
28      """ 
29      Return default Source Package Manager plugin class. 
30   
31      @return: default Source Package Manager plugin class 
32      @raise SystemError: if no default plugin class has been specified. 
33          This usually means a programming error. 
34      """ 
35      fallback_used = False 
36      myplugs = get_available_plugins() 
37      if _USER_PLUG is not None: 
38          user_plugin = myplugs.get(_USER_PLUG) 
39          if user_plugin is not None: 
40              return user_plugin 
41          fallback_used = True 
42   
43      for plug_id in sorted(myplugs): 
44          plug_class = myplugs[plug_id] 
45          if plug_class.IS_DEFAULT: 
46              if fallback_used: 
47                  import warnings 
48                  warnings.warn("%s: %s" % ( 
49                      "User configured Source Package Manager Plugin not available, " 
50                      "using fallback", plug_id,)) 
51              return plug_class 
52   
53      raise SystemError("no SPM default plugin configured") 
54   
55 -def get_default_instance(output_interface): 
56      """ 
57      Return the currently configured Entropy SPM interface instance. 
58   
59      @param output_interface: Entropy Output Interface instance 
60      @type output_interface: entropy.output.TextInterface based instance 
61      @return: currently selected SPM interface 
62      @rtype: entropy.spm.plugins.skel.SpmPlugin based instance 
63      """ 
64      spm_class = get_default_class() 
65      return spm_class(output_interface) 
66