# SNMP::Info::CiscoPower
# Bill Fenner
#
# Copyright (c) 2007 Bill Fenner
# 
# 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 University of California, Santa Cruz 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.

package SNMP::Info::CiscoPower;
$VERSION = '1.05';
# $Id$

use strict;

use Exporter;
use SNMP::Info;

use vars qw/$VERSION $DEBUG %MIBS %FUNCS %GLOBALS %MUNGE $INIT/;
@SNMP::Info::CiscoPower::ISA = qw/SNMP::Info Exporter/;
@SNMP::Info::CiscoPower::EXPORT_OK = qw//;

%MIBS    = ('CISCO-POWER-ETHERNET-EXT-MIB' => 'cpeExtPsePortEntPhyIndex');

%GLOBALS = (
           );

%FUNCS   = (
	    'cpeth_ent_phy'    => 'cpeExtPsePortEntPhyIndex',
           );

%MUNGE   = (
           );

# Cisco overcame the limitation of the module.port index of the
# pethPsePortTable by adding another mapping table, which maps
# a pethPsePortTable row to an entPhysicalTable index, which can
# then be mapped to ifIndex.
sub peth_port_ifindex {
    my $cpeth = shift;
    my $partial = shift;

    my $ent_phy = $cpeth->cpeth_ent_phy($partial);
    my $e_port = $cpeth->e_port();

    my $peth_port_ifindex = {};
    foreach my $i (keys %$ent_phy) {
	if ($e_port->{$ent_phy->{$i}}) {
	    $peth_port_ifindex->{$i} = $e_port->{$ent_phy->{$i}};
	}
    }
    return $peth_port_ifindex;
}

1;

=head1 NAME

SNMP::Info::CiscoPower - SNMP Interface to data stored in CISCO-POWER-ETHERNET-EXT-MIB.

=head1 AUTHOR

Bill Fenner

=head1 SYNOPSIS

 # Let SNMP::Info determine the correct subclass for you. 
 my $poe = new SNMP::Info(
                          AutoSpecify => 1,
                          Debug       => 1,
                          # These arguments are passed directly on to SNMP::Session
                          DestHost    => 'myswitch',
                          Community   => 'public',
                          Version     => 2
                        ) 
    or die "Can't connect to DestHost.\n";

 my $class      = $poe->class();
 print "SNMP::Info determined this device to fall under subclass : $class\n";

=head1 DESCRIPTION

The Info::PowerEthernet class needs a per-device helper function to
properly map the pethPsePortTable to ifIndex values.  This class
provides that helper, using CISCO-POWER-ETHERNET-EXT-MIB.
It does not define any helpers for the extra values that this MIB
contains.

Create or use a device subclass that inherit this class.  Do not use directly.

For debugging purposes you can call this class directly as you would SNMP::Info

 my $poe = new SNMP::Info::CiscoPower (...);

=head2 Inherited Classes

none.

Note that it requires that the device inherits from Info::Entity.

=head2 Required MIBs

=over

=item CISCO-POWER-ETHERNET-EXT-MIB

=back

=head1 GLOBALS

none.

=head1 TABLE METHODS

These are methods that return tables of information in the form of a reference
to a hash.

=head2 Power Port Table

=over

=item $poe->peth_port_ifindex()

Maps the pethPsePortTable to ifIndex by way of the ENTITY-MIB.

=back

=cut