# Slixmpp: The Slick XMPP Library
# Copyright (C) 2011  Nathanael C. Fritz
# This file is part of Slixmpp.
# See the file LICENSE for copying permission.
from slixmpp.xmlstream import ElementBase, ET


class Mechanisms(ElementBase):

    """
    """

    name = 'mechanisms'
    namespace = 'urn:ietf:params:xml:ns:xmpp-sasl'
    interfaces = {'mechanisms', 'required'}
    plugin_attrib = name
    is_extension = True

    def get_required(self):
        """
        """
        return True

    def get_mechanisms(self):
        """
        """
        results = []
        mechs = self.xml.findall('{%s}mechanism' % self.namespace)
        if mechs:
            for mech in mechs:
                results.append(mech.text)
        return results

    def set_mechanisms(self, values):
        """
        """
        self.del_mechanisms()
        for val in values:
            mech = ET.Element('{%s}mechanism' % self.namespace)
            mech.text = val
            self.append(mech)

    def del_mechanisms(self):
        """
        """
        mechs = self.xml.findall('{%s}mechanism' % self.namespace)
        if mechs:
            for mech in mechs:
                self.xml.remove(mech)