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# Copyright (c) 2010 Chris Moyer http://coredumped.org/
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish, dis-
# tribute, sublicense, and/or sell copies of the Software, and to permit
# persons to whom the Software is furnished to do so, subject to the fol-
# lowing conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
# ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
# SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
import xml.sax
import cgi
from StringIO import StringIO
class ResponseGroup(xml.sax.ContentHandler):
"""A Generic "Response Group", which can
be anything from the entire list of Items to
specific response elements within an item"""
def __init__(self, connection=None, nodename=None):
"""Initialize this Item"""
self._connection = connection
self._nodename = nodename
self._nodepath = []
self._curobj = None
self._xml = StringIO()
def __repr__(self):
return '<%s: %s>' % (self.__class__.__name__, self.__dict__)
#
# Attribute Functions
#
def get(self, name):
return self.__dict__.get(name)
def set(self, name, value):
self.__dict__[name] = value
def to_xml(self):
return "<%s>%s</%s>" % (self._nodename, self._xml.getvalue(), self._nodename)
#
# XML Parser functions
#
def startElement(self, name, attrs, connection):
self._xml.write("<%s>" % name)
self._nodepath.append(name)
if len(self._nodepath) == 1:
obj = ResponseGroup(self._connection)
self.set(name, obj)
self._curobj = obj
elif self._curobj:
self._curobj.startElement(name, attrs, connection)
return None
def endElement(self, name, value, connection):
self._xml.write("%s</%s>" % (cgi.escape(value).replace("&amp;", "&"), name))
if len(self._nodepath) == 0:
return
obj = None
curval = self.get(name)
if len(self._nodepath) == 1:
if value or not curval:
self.set(name, value)
if self._curobj:
self._curobj = None
#elif len(self._nodepath) == 2:
#self._curobj = None
elif self._curobj:
self._curobj.endElement(name, value, connection)
self._nodepath.pop()
return None
class Item(ResponseGroup):
"""A single Item"""
def __init__(self, connection=None):
"""Initialize this Item"""
ResponseGroup.__init__(self, connection, "Item")
class ItemSet(ResponseGroup):
"""A special ResponseGroup that has built-in paging, and
only creates new Items on the "Item" tag"""
def __init__(self, connection, action, params, page=0):
ResponseGroup.__init__(self, connection, "Items")
self.objs = []
self.iter = None
self.page = page
self.action = action
self.params = params
self.curItem = None
def startElement(self, name, attrs, connection):
if name == "Item":
self.curItem = Item(self._connection)
elif self.curItem != None:
self.curItem.startElement(name, attrs, connection)
return None
def endElement(self, name, value, connection):
if name == 'TotalResults':
self.total_results = value
elif name == 'TotalPages':
self.total_pages = value
elif name == "Item":
self.objs.append(self.curItem)
self._xml.write(self.curItem.to_xml())
self.curItem = None
elif self.curItem != None:
self.curItem.endElement(name, value, connection)
return None
def next(self):
"""Special paging functionality"""
if self.iter == None:
self.iter = iter(self.objs)
try:
return self.iter.next()
except StopIteration:
self.iter = None
self.objs = []
if int(self.page) < int(self.total_pages):
self.page += 1
self._connection.get_response(self.action, self.params, self.page, self)
return self.next()
else:
raise
def __iter__(self):
return self
def to_xml(self):
"""Override to first fetch everything"""
for item in self:
pass
return ResponseGroup.to_xml(self)
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