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diff --git a/rt/lib/RT/Shredder/Plugin/Base.pm b/rt/lib/RT/Shredder/Plugin/Base.pm
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+++ b/rt/lib/RT/Shredder/Plugin/Base.pm
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+# BEGIN BPS TAGGED BLOCK {{{
+# 
+# COPYRIGHT:
+# 
+# This software is Copyright (c) 1996-2009 Best Practical Solutions, LLC
+#                                          <jesse@bestpractical.com>
+# 
+# (Except where explicitly superseded by other copyright notices)
+# 
+# 
+# LICENSE:
+# 
+# This work is made available to you under the terms of Version 2 of
+# the GNU General Public License. A copy of that license should have
+# been provided with this software, but in any event can be snarfed
+# from www.gnu.org.
+# 
+# This work 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 or visit their web page on the internet at
+# http://www.gnu.org/licenses/old-licenses/gpl-2.0.html.
+# 
+# 
+# CONTRIBUTION SUBMISSION POLICY:
+# 
+# (The following paragraph is not intended to limit the rights granted
+# to you to modify and distribute this software under the terms of
+# the GNU General Public License and is only of importance to you if
+# you choose to contribute your changes and enhancements to the
+# community by submitting them to Best Practical Solutions, LLC.)
+# 
+# By intentionally submitting any modifications, corrections or
+# derivatives to this work, or any other work intended for use with
+# Request Tracker, to Best Practical Solutions, LLC, you confirm that
+# you are the copyright holder for those contributions and you grant
+# Best Practical Solutions,  LLC a nonexclusive, worldwide, irrevocable,
+# royalty-free, perpetual, license to use, copy, create derivative
+# works based on those contributions, and sublicense and distribute
+# those contributions and any derivatives thereof.
+# 
+# END BPS TAGGED BLOCK }}}
+
+package RT::Shredder::Plugin::Base;
+
+use strict;
+use warnings FATAL => 'all';
+
+=head1 NAME
+
+RT::Shredder::Plugin::Base - base class for Shredder plugins.
+
+=cut
+
+sub new
+{
+    my $proto = shift;
+    my $self = bless( {}, ref $proto || $proto );
+    $self->_Init( @_ );
+    return $self;
+}
+
+sub _Init
+{
+    my $self = shift;
+    $self->{'opt'} = { @_ };
+}
+
+=head1 USAGE
+
+=head2 masks
+
+If any argument is marked with keyword C<mask> then it means
+that this argument support two special characters:
+
+1) C<*> matches any non empty sequence of the characters.
+For example C<*@example.com> will match any email address in
+C<example.com> domain.
+
+2) C<?> matches exactly one character.
+For example C<????> will match any string four characters long.
+
+=head1 METHODS
+
+=head2 for subclassing in plugins
+
+=head3 Type - is not supported yet
+
+See F<Todo> for more info.
+
+=cut
+
+sub Type { return '' }
+
+=head3 SupportArgs
+
+Takes nothing.
+Returns list of the supported plugin arguments.
+
+Base class returns list of the arguments which all
+classes B<must> support.
+
+=cut
+
+sub SupportArgs { return () }
+
+=head3 HasSupportForArgs
+
+Takes a list of argument names. Returns true if
+all arguments are supported by plugin and returns
+C<(0, $msg)> in other case.
+
+=cut
+
+sub HasSupportForArgs
+{
+    my $self = shift;
+    my @args = @_;
+    my @unsupported = ();
+    foreach my $a( @args ) {
+        push @unsupported, $a unless grep $_ eq $a, $self->SupportArgs;
+    }
+    return( 1 ) unless @unsupported;
+    return( 0, "Plugin doesn't support argument(s): @unsupported" ) if @unsupported;
+}
+
+=head3 TestArgs
+
+Takes hash with arguments and thier values and returns true
+if all values pass testing otherwise returns C<(0, $msg)>.
+
+Stores arguments hash in C<$self->{'opt'}>, you can access this hash
+from C<Run> method.
+
+Method should be subclassed if plugin support non standard arguments.
+
+=cut
+
+sub TestArgs
+{
+    my $self = shift;
+    my %args = @_;
+    if ( $self->{'opt'} ) {
+        $self->{'opt'} = { %{$self->{'opt'}}, %args };
+    } else {
+        $self->{'opt'} = \%args;
+    }
+    return 1;
+}
+
+=head3 Run
+
+Takes no arguments.
+Executes plugin and return C<(1, @objs)> on success or
+C<(0, $msg)> if error had happenned.
+
+Method B<must> be subclassed, this class always returns error.
+
+Method B<must> be called only after C<TestArgs> method in other
+case values of the arguments are not available.
+
+=cut
+
+sub Run { return (0, "This is abstract plugin, you couldn't use it directly") }
+
+=head2 utils
+
+=head3 ConvertMaskToSQL
+
+Takes one argument - mask with C<*> and C<?> chars and
+return mask SQL chars.
+
+=cut
+
+sub ConvertMaskToSQL {
+    my $self = shift;
+    my $mask = shift || '';
+    $mask =~ s/\*/%/g;
+    $mask =~ s/\?/_/g;
+    return $mask;
+}
+
+1;