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-rw-r--r--sleekxmpp/xmlstream/stanzabase.py41
1 files changed, 32 insertions, 9 deletions
diff --git a/sleekxmpp/xmlstream/stanzabase.py b/sleekxmpp/xmlstream/stanzabase.py
index 96b4f181..e1a2085a 100644
--- a/sleekxmpp/xmlstream/stanzabase.py
+++ b/sleekxmpp/xmlstream/stanzabase.py
@@ -228,6 +228,13 @@ class ElementBase(object):
#: needing to define custom methods.
sub_interfaces = tuple()
+ #: A subset of :attr:`interfaces` which maps the presence of
+ #: subelements to boolean values. Using this set allows for quickly
+ #: checking for the existence of empty subelements like ``<required />``.
+ #:
+ #: .. versionadded:: 1.1
+ bool_interfaces = tuple()
+
#: In some cases you may wish to override the behaviour of one of the
#: parent stanza's interfaces. The ``overrides`` list specifies the
#: interface name and access method to be overridden. For example,
@@ -489,9 +496,11 @@ class ElementBase(object):
4. The result of calling ``getFoo``.
5. The contents of the ``foo`` subelement, if ``foo`` is listed
in :attr:`sub_interfaces`.
- 6. The value of the ``foo`` attribute of the XML object.
- 7. The plugin named ``'foo'``
- 8. An empty string.
+ 6. True or False depending on the existence of a ``foo``
+ subelement and ``foo`` is in :attr:`bool_interfaces`.
+ 7. The value of the ``foo`` attribute of the XML object.
+ 8. The plugin named ``'foo'``
+ 9. An empty string.
:param string attrib: The name of the requested stanza interface.
"""
@@ -517,6 +526,9 @@ class ElementBase(object):
else:
if attrib in self.sub_interfaces:
return self._get_sub_text(attrib)
+ elif attrib in self.bool_interfaces:
+ elem = self.xml.find('{%s}%s' % (self.namespace, attrib))
+ return elem is not None
else:
return self._get_attr(attrib)
elif attrib in self.plugin_attrib_map:
@@ -550,10 +562,12 @@ class ElementBase(object):
4. Call ``setFoo``, if it exists.
5. Set the text of a ``foo`` element, if ``'foo'`` is
in :attr:`sub_interfaces`.
- 6. Set the value of a top level XML attribute named ``foo``.
- 7. Attempt to pass the value to a plugin named ``'foo'`` using
+ 6. Add or remove an empty subelement ``foo``
+ if ``foo`` is in :attr:`bool_interfaces`.
+ 7. Set the value of a top level XML attribute named ``foo``.
+ 8. Attempt to pass the value to a plugin named ``'foo'`` using
the plugin's ``'foo'`` interface.
- 8. Do nothing.
+ 9. Do nothing.
:param string attrib: The name of the stanza interface to modify.
:param value: The new value of the stanza interface.
@@ -580,6 +594,11 @@ class ElementBase(object):
else:
if attrib in self.sub_interfaces:
return self._set_sub_text(attrib, text=value)
+ elif attrib in self.bool_interfaces:
+ if value:
+ return self._set_sub_text(attrib, '', keep=True)
+ else:
+ return self._set_sub_text(attrib, '', keep=False)
else:
self._set_attr(attrib, value)
else:
@@ -614,9 +633,11 @@ class ElementBase(object):
3. Call ``delFoo``, if it exists.
4. Delete ``foo`` element, if ``'foo'`` is in
:attr:`sub_interfaces`.
- 5. Delete top level XML attribute named ``foo``.
- 6. Remove the ``foo`` plugin, if it was loaded.
- 7. Do nothing.
+ 5. Remove ``foo`` element if ``'foo'`` is in
+ :attr:`bool_interfaces`.
+ 6. Delete top level XML attribute named ``foo``.
+ 7. Remove the ``foo`` plugin, if it was loaded.
+ 8. Do nothing.
:param attrib: The name of the affected stanza interface.
"""
@@ -640,6 +661,8 @@ class ElementBase(object):
else:
if attrib in self.sub_interfaces:
return self._del_sub(attrib)
+ elif attrib in self.bool_interfaces:
+ return self._del_sub(attrib)
else:
self._del_attr(attrib)
elif attrib in self.plugin_attrib_map: