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annotate frontends/src/quick_frontend/quick_widgets.py @ 1300:ba73798317a7 frontends_multi_profiles

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core: fixed items registration in roster management
author Goffi <goffi@goffi.org>
date Fri, 06 Feb 2015 18:54:44 +0100
parents faa1129559b8
children afc57b34c0a3
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1 #!/usr/bin/python
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2 # -*- coding: utf-8 -*-
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3
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4 # helper class for making a SAT frontend
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5 # Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 Jérôme Poisson (goffi@goffi.org)
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 from sat.core.log import getLogger
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21 log = getLogger(__name__)
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22 from sat.core import exceptions
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25 classes_map = {}
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26
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27
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28 try:
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29 # FIXME: to be removed when an acceptable solution is here
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30 unicode('') # XXX: unicode doesn't exist in pyjamas
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31 except (TypeError, AttributeError): # Error raised is not the same depending on pyjsbuild options
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32 unicode = str
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33
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34
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35 def register(base_cls, child_cls=None):
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36 """Register a child class to use by default when a base class is needed
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38 @param base_cls: "Quick..." base class (like QuickChat or QuickContact), must inherit from QuickWidget
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39 @param child_cls: inherited class to use when Quick... class is requested, must inherit from base_cls.
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40 Can be None if it's the base_cls itself which register
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41 """
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42 classes_map[base_cls] = child_cls
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43
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45 class QuickWidgetsManager(object):
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46 """This class is used to manage all the widgets of a frontend
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47 A widget can be a window, a graphical thing, or someting else depending of the frontend"""
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48
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49 def __init__(self, host):
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50 self.host = host
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51 self._widgets = {}
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52
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53 def __iter__(self):
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54 """Iterate throught all widgets"""
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55 for widget_map in self._widgets.itervalues():
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56 for widget in widget_map.itervalues():
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57 yield widget
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58
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59 def getRealClass(self, class_):
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60 """Return class registered for given class_
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61
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62 @param class_: subclass of QuickWidget
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63 @return: class actually used to create widget
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64 """
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65 try:
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66 cls = classes_map[class_]
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67 except KeyError:
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68 cls = class_
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69 if cls is None:
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70 raise exceptions.InternalError("There is not class registered for {}".format(class_))
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71 return cls
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72
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73 def getWidgets(self, class_):
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74 """Get all subclassed widgets
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75
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76 @param class_: subclass of QuickWidget, same parameter as used in [getOrCreateWidget]
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77 @return: iterator on widgets
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78 """
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79 class_ = self.getRealClass(class_)
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80 try:
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81 widgets_map = self._widgets[class_]
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82 except KeyError:
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83 return iter([])
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84 else:
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85 return widgets_map.itervalues()
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86
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87 def getOrCreateWidget(self, class_, target, *args, **kwargs):
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88 """Get an existing widget or create a new one when necessary
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89
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90 If the widget is new, self.host.newWidget will be called with it.
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91 @param class_(class): class of the widget to create
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92 @param target: target depending of the widget, usually a JID instance
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93 @param args(list): optional args to create a new instance of class_
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94 @param kwargs(list): optional kwargs to create anew instance of class_
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95 if 'profile' key is present, it will be popped and put in 'profiles'
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96 if there is neither 'profile' nor 'profiles', None will be used for 'profiles'
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97 if 'on_new_widget' is present it can have the following values:
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98 'NEW_WIDGET' [default]: self.host.newWidget will be called on widget creation
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99 [callable]: this method will be called instead of self.host.newWidget
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100 None: do nothing
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101 if 'force_hash' is present, the hash given in value will be used instead of the one returned by class_.getWidgetHash
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102 @return: a class_ instance, either new or already existing
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103 """
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104 cls = self.getRealClass(class_)
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105
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106 # arguments management
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107 _args = [self.host, target] + list(args) or [] # FIXME: check if it's really necessary to use optional args
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108 _kwargs = kwargs or {}
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109 if 'profiles' in _kwargs and 'profile' in _kwargs:
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110 raise ValueError("You can't have 'profile' and 'profiles' keys at the same time")
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111 try:
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112 _kwargs['profiles'] = _kwargs.pop('profile')
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113 except KeyError:
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114 if not 'profiles' in _kwargs:
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115 _kwargs['profiles'] = None
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116
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117 # we get the hash
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118 try:
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119 hash_ = _kwargs.pop('force_hash')
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120 except KeyError:
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121 hash_ = cls.getWidgetHash(target, _kwargs['profiles'])
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122
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123 # widget creation or retrieval
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124 widgets_map = self._widgets.setdefault(cls, {}) # we sorts widgets by classes
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125 if not cls.SINGLE:
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126 widget = None # if the class is not SINGLE, we always create a new widget
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127 else:
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128 try:
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129 widget = widgets_map[hash_]
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130 widget.addTarget(target)
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131 except KeyError:
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132 widget = None
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133
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134 if widget is None:
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135 # we need to create a new widget
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136 try:
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137 #on_new_widget tell what to do for the new widget creation
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138 on_new_widget = _kwargs.pop('on_new_widget')
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139 except KeyError:
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140 on_new_widget = 'NEW_WIDGET'
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141
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142 log.debug(u"Creating new widget for target {} {}".format(target, cls))
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143 widget = cls(*_args, **_kwargs)
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144 widgets_map[hash_] = widget
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145
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146 if on_new_widget == 'NEW_WIDGET':
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147 self.host.newWidget(widget)
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148 elif callable(on_new_widget):
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149 on_new_widget(widget)
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150 else:
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151 assert on_new_widget is None
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152
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153 return widget
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154
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155
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156 class QuickWidget(object):
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157 """generic widget base"""
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158 SINGLE=True # if True, there can be only one widget per target(s)
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159 PROFILES_MULTIPLE=False
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160 PROFILES_ALLOW_NONE=False
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161
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162 def __init__(self, host, target, profiles=None):
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163 """
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164 @param host: %(doc_host)s
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165 @param target: target specific for this widget class
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166 @param profiles: can be either:
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167 - (unicode): used when widget class manage a unique profile
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168 - (iterable): some widget class can manage several profiles, several at once can be specified here
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169 - None: no profile is managed by this widget class (rare)
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170 @raise: ValueError when (iterable) or None is given to profiles for a widget class which manage one unique profile.
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171 """
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172 self.host = host
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173 self.targets = set()
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174 self.addTarget(target)
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175 self.profiles = set()
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176 if isinstance(profiles, basestring):
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177 self.addProfile(profiles)
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178 elif profiles is None:
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179 if not self.PROFILES_ALLOW_NONE:
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180 raise ValueError("profiles can't have a value of None")
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181 else:
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182 if not self.PROFILES_MULTIPLE:
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183 raise ValueError("multiple profiles are not allowed")
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184 for profile in profiles:
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185 self.addProfile(profile)
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186
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187 @property
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188 def profile(self):
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189 assert len(self.profiles) == 1 and not self.PROFILES_MULTIPLE and not self.PROFILES_ALLOW_NONE
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190 return list(self.profiles)[0]
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191
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192 def addTarget(self, target):
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193 """Add a target if it doesn't already exists
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194
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195 @param target: target to add
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196 """
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197 self.targets.add(target)
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198
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199 def addProfile(self, profile):
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200 """Add a profile is if doesn't already exists
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201
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202 @param profile: profile to add
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203 """
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204 if self.profiles and not self.PROFILES_MULTIPLE:
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205 raise ValueError("multiple profiles are not allowed")
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206 self.profiles.add(profile)
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207
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208 @staticmethod
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209 def getWidgetHash(target, profiles):
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210 """Return the hash associated with this target for this widget class
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211
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212 some widget classes can manage several target on the same instance
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213 (e.g.: a chat widget with multiple resources on the same bare jid),
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214 this method allow to return a hash associated to one or several targets
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215 to retrieve the good instance. For example, a widget managing JID targets,
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216 and all resource of the same bare jid would return the bare jid as hash.
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217
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218 @param target: target to check
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219 @param profiles: profile(s) associated to target, see __init__ docstring
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220 @return: a hash (can correspond to one or many targets or profiles, depending of widget class)
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221 """
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222 return unicode(target) # by defaut, there is one hash for one target