# Copyright (c) 2012 Advanced Micro Devices, Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import m5

class BaseTopology(object):
    description = "BaseTopology"

    def __init__(self):
        """ When overriding place any objects created in
            configs/ruby/<protocol>.py that are needed in
            makeTopology (below) here. The minimum is usually
            all of the controllers created in the above file.
        """

    def makeTopology(self, options, network, IntLink, ExtLink, Router):
        """ Called from configs/ruby/Ruby.py
            The return value is ( list(Router), list(IntLink), list(ExtLink))
            The API of this function cannot change when subclassing!!
            Any additional information needed to create this topology should
            be passed into the constructor when it's instantiated in
            configs/ruby/<protocol>.py
        """
        m5.util.fatal("BaseTopology should have been overridden!!")

    def registerTopology(self, options):
        """ Called from configs/ruby/Ruby.py
            There is no return value. This should only be called in
            SE mode. It is used by some topology objects to populate
            the faux filesystem with accurate file contents.
            No need to implement if not using FilesystemRegister
            functionality.
        """

class SimpleTopology(BaseTopology):
    """ Provides methods needed for the topologies included in Ruby before
        topology changes.
        These topologies are "simple" in the sense that they only use a flat
        list of controllers to construct the topology.
    """
    description = "SimpleTopology"

    def __init__(self, controllers):
        self.nodes = controllers

    def addController(self, controller):
        self.nodes.append(controller)

    def __len__(self):
        return len(self.nodes)
