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# Copyright (C) 2007-2008 by the Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
# USA.
"""Interface describing the basics of chains and links."""
from munepy import Enum
from zope.interface import Interface, Attribute
class LinkAction(Enum):
# Jump to another chain.
jump = 0
# Take a detour to another chain, returning to the original chain when
# completed (if no other jump occurs).
detour = 1
# Stop processing all chains.
stop = 2
# Continue processing the next link in the chain.
defer = 3
# Run a function and continue processing.
run = 4
class IChainLink(Interface):
"""A link in the chain."""
rule = Attribute('The rule to run for this link.')
action = Attribute('The LinkAction to take if this rule matches.')
chain = Attribute('The chain to jump or detour to.')
function = Attribute(
"""The function to execute.
The function takes three arguments and returns nothing.
:param mlist: the IMailingList object
:param msg: the message being processed
:param msgdata: the message metadata dictionary
""")
class IChain(Interface):
"""A chain of rules."""
name = Attribute('Chain name; must be unique.')
description = Attribute('A brief description of the chain.')
def get_links(mlist, msg, msgdata):
"""Get an `IChainIterator` for processing.
:param mlist: the IMailingList object
:param msg: the message being processed
:param msgdata: the message metadata dictionary
:return: An `IChainIterator`.
"""
class IChainIterator(Interface):
"""An iterator over chain rules."""
def __iter__():
"""Iterate over all the IChainLinks in this chain.
:return: an IChainLink.
"""
class IMutableChain(IChain):
"""Like `IChain` but can be mutated."""
def append_link(link):
"""Add a new chain link to the end of this chain.
:param link: The chain link to add.
"""
def flush():
"""Delete all links in this chain."""
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