#-------------------------------------------------------------------------
# Copyright (c) Microsoft.  All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#--------------------------------------------------------------------------
import sys


class WindowsAzureData(object):

    ''' This is the base of data class.
    It is only used to check whether it is instance or not. '''
    pass


class Feed(object):
    pass


class _Base64String(str):
    pass


class HeaderDict(dict):

    def __getitem__(self, index):
        return super(HeaderDict, self).__getitem__(index.lower())


class _dict_of(dict):

    """a dict which carries with it the xml element names for key,val.
    Used for deserializaion and construction of the lists"""

    def __init__(self, pair_xml_element_name, key_xml_element_name,
                 value_xml_element_name):
        self.pair_xml_element_name = pair_xml_element_name
        self.key_xml_element_name = key_xml_element_name
        self.value_xml_element_name = value_xml_element_name
        super(_dict_of, self).__init__()


class _list_of(list):

    """a list which carries with it the type that's expected to go in it.
    Used for deserializaion and construction of the lists"""

    def __init__(self, list_type, xml_element_name=None):
        self.list_type = list_type
        if xml_element_name is None:
            self.xml_element_name = list_type.__name__
        else:
            self.xml_element_name = xml_element_name
        super(_list_of, self).__init__()


class _scalar_list_of(list):

    """a list of scalar types which carries with it the type that's
    expected to go in it along with its xml element name.
    Used for deserializaion and construction of the lists"""

    def __init__(self, list_type, xml_element_name):
        self.list_type = list_type
        self.xml_element_name = xml_element_name
        super(_scalar_list_of, self).__init__()


class _xml_attribute:
    
    """a accessor to XML attributes
    expected to go in it along with its xml element name.
    Used for deserialization and construction"""
    
    def __init__(self, xml_element_name):
        self.xml_element_name = xml_element_name


if sys.version_info < (3,):
    _unicode_type = unicode
    _strtype = basestring
else:
    _unicode_type = str
    _strtype = str