attribute in Option now starts with '_'

add ValidateError
add consistancies in Option
remove byattr in find

test/test_config_api.py

@@ -160,9 +160,9 @@ def test_find_in_config():
     assert conf.find_first(bytype=BoolOption, byname='dummy') == conf.unwrap_from_path('gc.dummy')
     assert conf.find(byvalue=False, byname='dummy') == [conf.unwrap_from_path('gc.dummy')]
     assert conf.find_first(byvalue=False, byname='dummy') == conf.unwrap_from_path('gc.dummy')
-    # byattrs
+    ## byattrs
-    assert conf.find_first(byattrs= dict(default=2.3)) == conf.unwrap_from_path('gc.float')
+    #assert conf.find_first(byattrs= dict(default=2.3)) == conf.unwrap_from_path('gc.float')
-    assert conf.find_first(byvalue=False, byname='dummy', byattrs=dict(default=False)) == conf.unwrap_from_path('gc.dummy')
+    #assert conf.find_first(byvalue=False, byname='dummy', byattrs=dict(default=False)) == conf.unwrap_from_path('gc.dummy')
 
 def test_does_not_find_in_config():
     descr = make_description()

test/test_option_setting.py

@@ -69,7 +69,7 @@ def test_reset_with_multi():
     config.unwrap_from_path("string").reset(config)
 #    assert config.string == ["string"]
     assert config.cfgimpl_get_values().getowner(s) == 'default'
-    raises(ConfigError, "config.string = None")
+    raises(ValidateError, "config.string = None")
 
 def test_default_with_multi():
     "default with multi is a list"
@@ -230,7 +230,7 @@ def test_multi_with_bool():
     s = BoolOption("bool", "", default=[False], multi=True)
     descr = OptionDescription("options", "", [s])
     config = Config(descr)
-    assert descr.bool.multi == True
+    assert descr.bool.is_multi() == True
     config.bool = [True, False]
     assert config.cfgimpl_get_values()[s] == [True, False]
     assert config.bool == [True, False]
@@ -239,8 +239,8 @@ def test_multi_with_bool_two():
     s = BoolOption("bool", "", default=[False], multi=True)
     descr = OptionDescription("options", "", [s])
     config = Config(descr)
-    assert descr.bool.multi == True
+    assert descr.bool.is_multi() == True
-    raises(ConfigError, "config.bool = True")
+    raises(ValidateError, "config.bool = True")
 
 def test_choice_access_with_multi():
     ch = ChoiceOption("t1", "", ("a", "b"), default=["a"], multi=True)

tiramisu/config.py

@@ -54,6 +54,9 @@ class SubConfig(object):
     def cfgimpl_get_values(self):
         return self._cfgimpl_context._cfgimpl_values
 
+    def cfgimpl_get_consistancies(self):
+        return self.cfgimpl_get_context().cfgimpl_get_description()._consistancies
+
     def cfgimpl_get_description(self):
         return self._cfgimpl_descr
 
@@ -101,7 +104,8 @@ class SubConfig(object):
     def __getattr__(self, name):
         return self._getattr(name)
 
-    def _getattr(self, name, force_permissive=False, force_properties=None):
+    def _getattr(self, name, force_permissive=False, force_properties=None,
+                 validate=True):
         """
         attribute notation mechanism for accessing the value of an option
         :param name: attribute name
@@ -115,13 +119,14 @@ class SubConfig(object):
                                                              force_permissive=force_permissive,
                                                              force_properties=force_properties)
             return homeconfig._getattr(name, force_permissive=force_permissive,
-                                       force_properties=force_properties)
+                                       force_properties=force_properties,
+                                       validate=validate)
         opt_or_descr = getattr(self._cfgimpl_descr, name)
         # symlink options
         if type(opt_or_descr) == SymLinkOption:
             rootconfig = self.cfgimpl_get_context()
             path = rootconfig.cfgimpl_get_description().get_path_by_opt(opt_or_descr.opt)
-            return getattr(rootconfig, path)
+            return rootconfig._getattr(path, validate=validate)
         self._validate(name, opt_or_descr, force_permissive=force_permissive)
         if isinstance(opt_or_descr, OptionDescription):
             children = self.cfgimpl_get_description()._children
@@ -136,7 +141,8 @@ class SubConfig(object):
             # if it were in __dict__ it would have been found already
             object.__getattr__(self, name)
         return self.cfgimpl_get_values()._getitem(opt_or_descr,
-                                                  force_properties=force_properties)
+                                                  force_properties=force_properties,
+                                                  validate=validate)
 
     def setoption(self, name, child, value):
         """effectively modifies the value of an Option()
@@ -279,35 +285,31 @@ class SubConfig(object):
         context_descr = self.cfgimpl_get_context().cfgimpl_get_description()
         return context_descr.get_path_by_opt(descr)
 
-    def find(self, bytype=None, byname=None, byvalue=None, byattrs=None,
+    def find(self, bytype=None, byname=None, byvalue=None, type_='option'):
-             type_='option'):
         """
             finds a list of options recursively in the config
 
             :param bytype: Option class (BoolOption, StrOption, ...)
             :param byname: filter by Option._name
             :param byvalue: filter by the option's value
-            :param byattrs: dict of option attributes (default, callback...)
             :returns: list of matching Option objects
         """
         return self.cfgimpl_get_context()._find(bytype, byname, byvalue,
-                                                byattrs, first=False,
+                                                first=False,
                                                 type_=type_,
                                                 _subpath=self.getpath())
 
-    def find_first(self, bytype=None, byname=None, byvalue=None, byattrs=None,
+    def find_first(self, bytype=None, byname=None, byvalue=None, type_='option'):
-                   type_='option'):
         """
             finds an option recursively in the config
 
             :param bytype: Option class (BoolOption, StrOption, ...)
             :param byname: filter by Option._name
             :param byvalue: filter by the option's value
-            :param byattrs: dict of option attributes (default, callback...)
             :returns: list of matching Option objects
         """
         return self.cfgimpl_get_context()._find(bytype, byname, byvalue,
-                                                byattrs, first=True,
+                                                first=True,
                                                 type_=type_,
                                                 _subpath=self.getpath())
 
@@ -324,7 +326,6 @@ class SubConfig(object):
             for path in self.cfgimpl_get_context()._find(bytype=Option,
                                                          byname=withoption,
                                                          byvalue=withvalue,
-                                                         byattrs=None,
                                                          first=False,
                                                          type_='path',
                                                          _subpath=mypath):
@@ -436,7 +437,7 @@ class Config(SubConfig):
     def getpath(self):
         return None
 
-    def _find(self, bytype, byname, byvalue, byattrs, first, type_='option',
+    def _find(self, bytype, byname, byvalue, first, type_='option',
               _subpath=None):
         """
         convenience method for finding an option that lives only in the subtree
@@ -470,18 +471,17 @@ class Config(SubConfig):
                 return True
             return False
 
-        def _filter_by_attrs():
+        #def _filter_by_attrs():
-            if byattrs is None:
+        #    if byattrs is None:
-                return True
+        #        return True
-            for key, value in byattrs.items():
+        #    for key, val in byattrs.items():
-                if not hasattr(option, key):
+        #        print "----", path, key
-                    return False
+        #        if path == key or path.endswith('.' + key):
-                else:
+        #            if value == val:
-                    if getattr(option, key) != value:
+        #                return True
-                        return False
+        #            else:
-                    else:
+        #                return False
-                        continue
+        #    return False
-            return True
         if type_ not in ('option', 'path', 'value'):
             raise ValueError('unknown type_ type {} for _find'.format(type_))
         find_results = []
@@ -497,15 +497,15 @@ class Config(SubConfig):
                 continue
             if not _filter_by_value():
                 continue
-            if not _filter_by_type():
-                continue
-            if not _filter_by_attrs():
-                continue
             #remove option with propertyerror, ...
             try:
                 value = getattr(self, path)
             except:  # a property restricts the access of the value
                 continue
+            if not _filter_by_type():
+                continue
+            #if not _filter_by_attrs():
+            #    continue
             if type_ == 'value':
                 retval = value
             elif type_ == 'path':

tiramisu/error.py

@@ -1,27 +1,53 @@
+class ValidateError(Exception):
+    "If validation failed"
+    pass
+
+
 class AmbigousOptionError(Exception):
     pass
+
+
 class NoMatchingOptionFound(AttributeError):
     pass
+
+
 class ConfigError(Exception):
     pass
+
+
 class ConflictConfigError(ConfigError):
     pass
+
+
 class PropertiesOptionError(AttributeError):
     def __init__(self, msg, proptype):
         self.proptype = proptype
         super(PropertiesOptionError, self).__init__(msg)
 
+
 class NotFoundError(Exception):
     pass
+
+
 class MethodCallError(Exception):
     pass
+
+
 class RequiresError(Exception):
     pass
+
+
 class RequirementRecursionError(RequiresError):
     pass
+
+
 class MandatoryError(Exception):
     pass
+
+
 class OptionValueError(Exception):
     pass
+
+
 class MultiTypeError(Exception):
     pass

tiramisu/option.py

@@ -23,8 +23,10 @@
 import re
 from copy import copy
 from types import FunctionType
+from IPy import IP
+
 from tiramisu.error import (ConfigError, NotFoundError, ConflictConfigError,
-                            RequiresError)
+                            RequiresError, ValidateError)
 from tiramisu.setting import groups, multitypes
 
 name_regexp = re.compile(r'^\d+')
@@ -44,7 +46,7 @@ def valid_name(name):
 
 
 class BaseInformation(object):
-    __slots__ = ('informations')
+    __slots__ = ('_informations')
 
     def set_information(self, key, value):
         """updates the information's attribute
@@ -53,15 +55,15 @@ class BaseInformation(object):
         :param key: information's key (ex: "help", "doc"
         :param value: information's value (ex: "the help string")
         """
-        self.informations[key] = value
+        self._informations[key] = value
 
     def get_information(self, key, default=None):
         """retrieves one information's item
 
         :param key: the item string (ex: "help")
         """
-        if key in self.informations:
+        if key in self._informations:
-            return self.informations[key]
+            return self._informations[key]
         elif default is not None:
             return default
         else:
@@ -74,9 +76,9 @@ class Option(BaseInformation):
 
     Reminder: an Option object is **not** a container for the value
     """
-    __slots__ = ('_name', '_requires', 'multi', '_validator', 'default_multi',
+    __slots__ = ('_name', '_requires', '_multi', '_validator', '_default_multi',
-                 'default', '_properties', 'callback', 'multitype',
+                 '_default', '_properties', '_callback', '_multitype',
-                 'master_slaves')
+                 '_master_slaves', '_consistency')
 
     def __init__(self, name, doc, default=None, default_multi=None,
                  requires=None, multi=False, callback=None,
@@ -103,11 +105,12 @@ class Option(BaseInformation):
         if not valid_name(name):
             raise NameError("invalid name: {0} for option".format(name))
         self._name = name
-        self.informations = {}
+        self._informations = {}
         self.set_information('doc', doc)
         validate_requires_arg(requires, self._name)
         self._requires = requires
-        self.multi = multi
+        self._multi = multi
+        self._consistency = None
         if validator is not None:
             if type(validator) != FunctionType:
                 raise TypeError("validator must be a function")
@@ -116,7 +119,7 @@ class Option(BaseInformation):
             self._validator = (validator, validator_args)
         else:
             self._validator = None
-        if not self.multi and default_multi is not None:
+        if not self._multi and default_multi is not None:
             raise ConfigError("a default_multi is set whereas multi is False"
                               " in option: {0}".format(name))
         if default_multi is not None and not self._validate(default_multi):
@@ -129,27 +132,27 @@ class Option(BaseInformation):
             raise ConfigError("params defined for a callback function but "
                               "no callback defined yet for option {0}".format(name))
         if callback is not None:
-            self.callback = (callback, callback_params)
+            self._callback = (callback, callback_params)
         else:
-            self.callback = None
+            self._callback = None
-        if self.multi:
+        if self._multi:
             if default is None:
                 default = []
-            if not isinstance(default, list):
+            #if not isinstance(default, list):
-                raise ConfigError("invalid default value {0} "
+            #    raise ValidateError("invalid default value {0} "
-                                  "for option {1} : not list type"
+            #                        "for option {1} : not list type"
-                                  "".format(str(default), name))
+            #                        "".format(str(default), name))
             if not self.validate(default):
-                raise ConfigError("invalid default value {0} "
+                raise ValidateError("invalid default value {0} "
                                     "for option {1}"
                                     "".format(str(default), name))
-            self.multitype = multitypes.default
+            self._multitype = multitypes.default
-            self.default_multi = default_multi
+            self._default_multi = default_multi
         else:
             if default is not None and not self.validate(default):
-                raise ConfigError("invalid default value {0} "
+                raise ValidateError("invalid default value {0} "
                                     "for option {1}".format(str(default), name))
-        self.default = default
+        self._default = default
         if properties is None:
             properties = ()
         if not isinstance(properties, tuple):
@@ -157,26 +160,34 @@ class Option(BaseInformation):
                               ' must be a tuple'.format(type(properties), self._name))
         self._properties = properties  # 'hidden', 'disabled'...
 
-    def validate(self, value, validate=True):
+    def validate(self, value, context=None, validate=True):
         """
         :param value: the option's value
         :param validate: if true enables ``self._validator`` validation
         """
         # generic calculation
-        if not self.multi:
+        if context is not None:
+            cons = context.cfgimpl_get_description()
+        else:
+            cons = None
+        if not self._multi:
             # None allows the reset of the value
             if value is not None:
                 # customizing the validator
                 if validate and self._validator is not None and \
                         not self._validator[0](value, **self._validator[1]):
                     return False
-                return self._validate(value)
+                if not self._validate(value):
+                    return False
+                if cons is not None:
+                    return cons.valid_consistency(self, value, context, None)
         else:
             if not isinstance(value, list):
-                raise ConfigError("invalid value {0} "
+                raise ValidateError("invalid value {0} "
                                     "for option {1} which must be a list"
                                     "".format(value, self._name))
-            for val in value:
+            for index in range(0, len(value)):
+                val = value[index]
                 # None allows the reset of the value
                 if val is not None:
                     # customizing the validator
@@ -185,23 +196,31 @@ class Option(BaseInformation):
                         return False
                     if not self._validate(val):
                         return False
+                    if cons is not None and not cons.valid_consistency(self, val, context, index):
+                        return False
         return True
 
     def getdefault(self, default_multi=False):
         "accessing the default value"
         if not default_multi or not self.is_multi():
-            return self.default
+            return self._default
         else:
             return self.getdefault_multi()
 
     def getdefault_multi(self):
         "accessing the default value for a multi"
-        return self.default_multi
+        return self._default_multi
+
+    def get_multitype(self):
+        return self._multitype
+
+    def get_master_slaves(self):
+        return self._master_slaves
 
     def is_empty_by_default(self):
         "no default value has been set yet"
-        if ((not self.is_multi() and self.default is None) or
+        if ((not self.is_multi() and self._default is None) or
-                (self.is_multi() and (self.default == [] or None in self.default))):
+                (self.is_multi() and (self._default == [] or None in self._default))):
             return True
         return False
 
@@ -211,7 +230,7 @@ class Option(BaseInformation):
 
     def has_callback(self):
         "to know if a callback has been defined or not"
-        if self.callback is None:
+        if self._callback is None:
             return False
         else:
             return True
@@ -225,11 +244,23 @@ class Option(BaseInformation):
         return value
 
     def is_multi(self):
-        return self.multi
+        return self._multi
+
+    def cons_not_equal(self, opt, value, context, index, opts):
+        values = [value]
+        descr = context.cfgimpl_get_description()
+        for opt_ in opts:
+            if opt_ is not opt:
+                path = descr.get_path_by_opt(opt_)
+                val = context._getattr(path, validate=False)
+                if val in values:
+                    return False
+                values.append(val)
+        return True
 
 
 class ChoiceOption(Option):
-    __slots__ = ('values', 'open_values', 'opt_type')
+    __slots__ = ('_values', '_open_values', 'opt_type')
     opt_type = 'string'
 
     def __init__(self, name, doc, values, default=None, default_multi=None,
@@ -238,11 +269,11 @@ class ChoiceOption(Option):
                  validator_args=None, properties=()):
         if not isinstance(values, tuple):
             raise ConfigError('values must be a tuple for {0}'.format(name))
-        self.values = values
+        self._values = values
         if open_values not in (True, False):
             raise ConfigError('Open_values must be a boolean for '
                               '{0}'.format(name))
-        self.open_values = open_values
+        self._open_values = open_values
         super(ChoiceOption, self).__init__(name, doc, default=default,
                                            default_multi=default_multi,
                                            callback=callback,
@@ -254,8 +285,8 @@ class ChoiceOption(Option):
                                            properties=properties)
 
     def _validate(self, value):
-        if not self.open_values:
+        if not self._open_values:
-            return value is None or value in self.values
+            return value is None or value in self._values
         else:
             return True
 
@@ -301,8 +332,9 @@ class UnicodeOption(Option):
 
 
 class SymLinkOption(object):
-    __slots__ = ('_name', 'opt')
+    __slots__ = ('_name', 'opt', '_consistency')
     opt_type = 'symlink'
+    _consistency = None
 
     def __init__(self, name, path, opt):
         self._name = name
@@ -320,27 +352,112 @@ class SymLinkOption(object):
 
 
 class IPOption(Option):
-    __slots__ = ('opt_type')
+    __slots__ = ('opt_type', '_only_private')
     opt_type = 'ip'
 
+    def set_private(self):
+        self._only_private = True
+
     def _validate(self, value):
-        # by now the validation is nothing but a string, use IPy instead
+        try:
-        return isinstance(value, str)
+            only_private = self._only_private
+        except AttributeError:
+            only_private = False
+        try:
+            ip = IP('{0}/32'.format(value))
+            if only_private:
+                return ip.iptype() == 'PRIVATE'
+            return True
+        except ValueError:
+            return False
+
+
+class NetworkOption(Option):
+    __slots__ = ('opt_type')
+    opt_type = 'network'
+
+    def _validate(self, value):
+        try:
+            IP(value)
+            return True
+        except ValueError:
+            return False
 
 
 class NetmaskOption(Option):
     __slots__ = ('opt_type')
     opt_type = 'netmask'
 
+    def __init__(self, name, doc, default=None, default_multi=None,
+                 requires=None, multi=False, callback=None,
+                 callback_params=None, validator=None, validator_args=None,
+                 properties=None, opt_ip=None):
+        if opt_ip is not None and not isinstance(opt_ip, IPOption) and \
+                not isinstance(opt_ip, NetworkOption):
+            raise ValueError('opt_ip must be a IPOption not {}'.format(type(opt_ip)))
+        super(NetmaskOption, self).__init__(name, doc, default=default,
+                                            default_multi=default_multi,
+                                            callback=callback,
+                                            callback_params=callback_params,
+                                            requires=requires,
+                                            multi=multi,
+                                            validator=validator,
+                                            validator_args=validator_args,
+                                            properties=properties)
+        if opt_ip is None:
+            pass
+        elif isinstance(opt_ip, IPOption):
+            self._consistency = ('cons_ip_netmask', (self, opt_ip))
+        elif isinstance(opt_ip, NetworkOption):
+            self._consistency = ('cons_network_netmask', (self, opt_ip))
+        else:
+            raise ValueError('unknown type for opt_ip')
+
     def _validate(self, value):
-        # by now the validation is nothing but a string, use IPy instead
+        try:
-        return isinstance(value, str)
+            IP('0.0.0.0/{}'.format(value))
+            return True
+        except ValueError:
+            return False
+
+    def cons_network_netmask(self, opt, value, context, index, opts):
+        #opts must be (netmask, network) options
+        return self._cons_netmask(opt, value, context, index, opts, False)
+
+    def cons_ip_netmask(self, opt, value, context, index, opts):
+        #opts must be (netmask, ip) options
+        return self._cons_netmask(opt, value, context, index, opts, True)
+
+    def _cons_netmask(self, opt, value, context, index, opts, make_net):
+        opt_netmask, opt_ipnetwork = opts
+        descr = context.cfgimpl_get_description()
+        if opt is opt_ipnetwork:
+            val_ipnetwork = value
+            path = descr.get_path_by_opt(opt_netmask)
+            val_netmask = context._getattr(path, validate=False)
+            if opt_netmask.is_multi():
+                val_netmask = val_netmask[index]
+            if val_netmask is None:
+                return True
+        else:
+            val_netmask = value
+            path = descr.get_path_by_opt(opt_ipnetwork)
+            val_ipnetwork = getattr(context, path)
+            if opt_ipnetwork.is_multi():
+                val_ipnetwork = val_ipnetwork[index]
+            if val_ipnetwork is None:
+                return True
+        try:
+            IP('{}/{}'.format(val_ipnetwork, val_netmask, make_net=make_net))
+            return True
+        except ValueError:
+            return False
 
 
 class OptionDescription(BaseInformation):
     """Config's schema (organisation, group) and container of Options"""
     __slots__ = ('_name', '_requires', '_cache_paths', '_group_type',
-                 '_properties', '_children')
+                 '_properties', '_children', '_consistencies')
 
     def __init__(self, name, doc, children, requires=None, properties=()):
         """
@@ -350,7 +467,7 @@ class OptionDescription(BaseInformation):
         if not valid_name(name):
             raise NameError("invalid name: {0} for option descr".format(name))
         self._name = name
-        self.informations = {}
+        self._informations = {}
         self.set_information('doc', doc)
         child_names = [child._name for child in children]
         #better performance like this
@@ -366,6 +483,7 @@ class OptionDescription(BaseInformation):
         validate_requires_arg(requires, self._name)
         self._requires = requires
         self._cache_paths = None
+        self._consistencies = None
         if not isinstance(properties, tuple):
             raise ConfigError('invalid properties type {0} for {1},'
                               ' must be a tuple'.format(type(properties), self._name))
@@ -409,12 +527,13 @@ class OptionDescription(BaseInformation):
     def getchildren(self):
         return self._children[1]
 
-    def build_cache(self, cache_path=None, cache_option=None, _currpath=None):
+    def build_cache(self, cache_path=None, cache_option=None, _currpath=None, _consistencies=None):
         if _currpath is None and self._cache_paths is not None:
             return
         if _currpath is None:
             save = True
             _currpath = []
+            _consistencies = {}
         else:
             save = False
         if cache_path is None:
@@ -426,9 +545,16 @@ class OptionDescription(BaseInformation):
                 continue
             cache_option.append(option)
             cache_path.append(str('.'.join(_currpath + [attr])))
-            if isinstance(option, OptionDescription):
+            if not isinstance(option, OptionDescription):
+                if option._consistency is not None:
+                    func, opts = option._consistency
+                    for opt in opts:
+                        if opt in _consistencies:
+                            raise ValueError('opt {} already in consistency'.format(opt._name))
+                        _consistencies[opt] = (func, opts)
+            else:
                 _currpath.append(attr)
-                option.build_cache(cache_path, cache_option, _currpath)
+                option.build_cache(cache_path, cache_option, _currpath, _consistencies)
                 _currpath.pop()
         if save:
             #valid no duplicated option
@@ -441,6 +567,7 @@ class OptionDescription(BaseInformation):
                                               '{0}'.format(child))
                 old = child
             self._cache_paths = (tuple(cache_option), tuple(cache_path))
+            self._consistencies = _consistencies
 
     def get_opt_by_path(self, path):
         try:
@@ -476,24 +603,24 @@ class OptionDescription(BaseInformation):
                     if isinstance(child, OptionDescription):
                         raise ConfigError("master group {} shall not have "
                                           "a subgroup".format(self._name))
-                    if not child.multi:
+                    if not child.is_multi():
                         raise ConfigError("not allowed option {0} in group {1}"
                                           ": this option is not a multi"
                                           "".format(child._name, self._name))
                     if child._name == self._name:
                         identical_master_child_name = True
-                        child.multitype = multitypes.master
+                        child._multitype = multitypes.master
                         master = child
                     else:
                         slaves.append(child)
                 if master is None:
                     raise ConfigError('master group with wrong master name for {}'
                                       ''.format(self._name))
-                master.master_slaves = tuple(slaves)
+                master._master_slaves = tuple(slaves)
                 for child in self._children[1]:
                     if child != master:
-                        child.master_slaves = master
+                        child._master_slaves = master
-                        child.multitype = multitypes.slave
+                        child._multitype = multitypes.slave
                 if not identical_master_child_name:
                     raise ConfigError("the master group: {} has not any "
                                       "master child".format(self._name))
@@ -503,6 +630,13 @@ class OptionDescription(BaseInformation):
     def get_group_type(self):
         return self._group_type
 
+    def valid_consistency(self, opt, value, context, index):
+        cons = self._consistencies.get(opt)
+        if cons is not None:
+            func, opts = cons
+            return getattr(opts[0], func)(opt, value, context, index, opts)
+        return True
+
 
 def validate_requires_arg(requires, name):
     "check malformed requirements"

tiramisu/value.py

@@ -18,7 +18,7 @@
 #
 # ____________________________________________________________
 from tiramisu.error import MandatoryError, MultiTypeError, \
-    ConfigError  # , OptionValueError
+    ConfigError, ValidateError
 from tiramisu.setting import owners, multitypes
 from tiramisu.autolib import carry_out_calculation
 
@@ -44,8 +44,8 @@ class Values(object):
             if opt.is_multi():
                 value = Multi(value, self.context, opt)
                 #if slave, had values until master's one
-                if opt.multitype == multitypes.slave:
+                if opt.get_multitype() == multitypes.slave:
-                    masterpath = self.context.cfgimpl_get_description().get_path_by_opt(opt.master_slaves)
+                    masterpath = self.context.cfgimpl_get_description().get_path_by_opt(opt.get_master_slaves())
                     mastervalue = getattr(self.context, masterpath)
                     masterlen = len(mastervalue)
                     if len(value) > masterlen:
@@ -118,7 +118,7 @@ class Values(object):
     def __getitem__(self, opt):
         return self._getitem(opt)
 
-    def _getitem(self, opt, force_properties=None):
+    def _getitem(self, opt, force_properties=None, validate=True):
         # options with callbacks
         value = self._get_value(opt)
         setting = self.context.cfgimpl_get_settings()
@@ -130,13 +130,11 @@ class Values(object):
             if not self.is_default_owner(opt) and (
                     not is_frozen or (is_frozen and
                                       not setting.has_property('force_default_on_freeze', opt, False))):
-                return value
+                pass
+            else:
                 value = self._getcallback_value(opt)
                 if opt.is_multi():
                     value = self.fill_multi(opt, value)
-            if not opt.validate(value, setting.has_property('validator')):
-                raise ConfigError('invalid calculated value returned'
-                                  ' for option {0}: {1}'.format(opt._name, value))
                 #suppress value if already set
                 self.reset(opt)
         # frozen and force default
@@ -145,15 +143,18 @@ class Values(object):
             if opt.is_multi():
                 value = self.fill_multi(opt, value)
         self._test_mandatory(opt, value, force_properties)
+        if validate and not opt.validate(value, self.context, setting.has_property('validator')):
+            raise ValidateError('invalid calculated value returned'
+                                ' for option {0}: {1}'.format(opt._name, value))
         return value
 
     def __setitem__(self, opt, value):
-        if not opt.validate(value,
+        if not opt.validate(value, self.context,
                             self.context.cfgimpl_get_settings().has_property('validator')):
-            raise ConfigError('invalid value {}'
+            raise ValidateError('invalid value {}'
                                 ' for option {}'.format(value, opt._name))
         if opt.is_multi():
-            if opt.multitype == multitypes.master:
+            if opt.get_multitype() == multitypes.master:
                 masterlen = len(value)
                 for slave in opt.master_slaves:
                     value_slave = self._get_value(slave)
@@ -165,7 +166,7 @@ class Values(object):
                         for num in range(0, masterlen - len(value_slave)):
                             value_slave.append(slave.getdefault_multi(), force=True)
 
-            elif opt.multitype == multitypes.slave:
+            elif opt.get_multitype() == multitypes.slave:
                 if len(self._get_value(opt.master_slaves)) != len(value):
                     raise MultiTypeError("invalid len for the slave: {0}"
                                          " which has {1} as master".format(
@@ -231,11 +232,11 @@ class Multi(list):
         only if the option is a master
         """
         if not force:
-            if self.opt.multitype == multitypes.slave:
+            if self.opt.get_multitype() == multitypes.slave:
                 raise MultiTypeError("cannot append a value on a multi option {0}"
                                      " which is a slave".format(self.opt._name))
-            elif self.opt.multitype == multitypes.master:
+            elif self.opt.get_multitype() == multitypes.master:
-                for slave in self.opt.master_slaves:
+                for slave in self.opt.get_master_slaves():
                     self.context.cfgimpl_get_values()[slave].append(slave.getdefault_multi(), force=True)
         self._validate(value)
         self.context.cfgimpl_get_values().setitem(self.opt, self)
@@ -259,7 +260,7 @@ class Multi(list):
                 raise MultiTypeError("cannot append a value on a multi option {0}"
                                      " which is a slave".format(self.opt._name))
             elif self.opt.multitype == multitypes.master:
-                for slave in self.opt.master_slaves:
+                for slave in self.opt.get_master_slaves():
                     self.context.cfgimpl_get_values()[slave].pop(key, force=True)
         self.context.cfgimpl_get_values().setitem(self.opt, self)
         return super(Multi, self).pop(key)