--- /dev/null
+package DBIx::DBSchema::Index;
+
+use strict;
+use vars qw($VERSION $DEBUG);
+
+$VERSION = 0.1;
+$DEBUG = 0;
+
+=head1 NAME
+
+DBIx::DBSchema::Index - Index objects
+
+=head1 SYNOPSYS
+
+ use DBIx::DBSchema::Index;
+
+ $index = new DBIx::DBSchema::Index (
+ {
+ }
+ );
+
+=head1 DESCRIPTION
+
+DBIx::DBSchema::Index objects represent a unique or non-unique database index.
+
+=head1 METHODS
+
+=over 4
+
+=item new HASHREF | OPTION, VALUE, ...
+
+Creates a new DBIx::DBschema::Index object.
+
+Accepts either a hashref or a list of options and values.
+
+Options are:
+
+=over 8
+
+=item name - Index name
+
+=item using - Optional index method
+
+=item unique - Boolean indicating whether or not this is a unique index.
+
+=item columns - List reference of column names (or expressions)
+
+=back
+
+=cut
+
+sub new {
+ my $proto = shift;
+ my $class = ref($proto) || $proto;
+ my %opt = ref($_[0]) ? %{$_[0]} : @_; #want a new reference
+ my $self = \%opt;
+ bless($self, $class);
+}
+
+=item name [ INDEX_NAME ]
+
+Returns or sets the index name.
+
+=cut
+
+sub name {
+ my($self, $value) = @_;
+ if ( defined($value) ) {
+ $self->{name} = $value;
+ } else {
+ $self->{name};
+ }
+}
+
+=item using [ INDEX_METHOD ]
+
+Returns or sets the optional index method.
+
+=cut
+
+sub using {
+ my($self, $value) = @_;
+ if ( defined($value) ) {
+ $self->{using} = $value;
+ } else {
+ defined($self->{using})
+ ? $self->{using}
+ : '';
+ }
+}
+
+=item unique [ BOOL ]
+
+Returns or sets the unique flag.
+
+=cut
+
+sub unique {
+ my($self, $value) = @_;
+ if ( defined($value) ) {
+ $self->{unique} = $value;
+ } else {
+ #$self->{unique};
+ $self->{unique} ? 1 : 0;
+ }
+}
+
+=item columns [ LISTREF ]
+
+Returns or sets the indexed columns (or expressions).
+
+=cut
+
+sub columns {
+ my($self, $value) = @_;
+ if ( defined($value) ) {
+ $self->{columns} = $value;
+ } else {
+ $self->{columns};
+ }
+}
+
+=item columns_sql
+
+Returns a comma-joined list of columns, suitable for an SQL statement.
+
+=cut
+
+sub columns_sql {
+ my $self = shift;
+ join(', ', @{ $self->columns } );
+}
+
+=item sql_create_index TABLENAME
+
+Returns an SQL statment to create this index on the specified table.
+
+=cut
+
+sub sql_create_index {
+ my( $self, $table ) = @_;
+
+ my $unique = $self->unique ? 'UNIQUE' : '';
+ my $name = $self->name;
+ my $col_sql = $self->columns_sql;
+
+ "CREATE $unique INDEX $name ON $table ( $col_sql )";
+}
+
+=item cmp OTHER_INDEX_OBJECT
+
+Compares this object to another supplied object. Returns true if they are
+identical, or false otherwise.
+
+=cut
+
+sub cmp {
+ my( $self, $other ) = @_;
+
+ $self->name eq $other->name and $self->cmp_noname($other);
+}
+
+=item cmp_noname OTHER_INDEX_OBJECT
+
+Compares this object to another supplied object. Returns true if they are
+identical, disregarding index name, or false otherwise.
+
+=cut
+
+sub cmp_noname {
+ my( $self, $other ) = @_;
+
+ $self->using eq $other->using
+ and $self->unique == $other->unique
+ and $self->columns_sql eq $other->columns_sql;
+
+}
+
+=back
+
+=head1 AUTHOR
+
+Ivan Kohler <ivan-dbix-dbschema@420.am>
+
+Copyright (c) 2007 Ivan Kohler
+Copyright (c) 2007 Freeside Internet Services, Inc.
+All rights reserved.
+This program is free software; you can redistribute it and/or modify it under
+the same terms as Perl itself.
+
+=head1 BUGS
+
+Is there any situation in which sql_create_index needs to return a list of
+multiple statements?
+
+=head1 SEE ALSO
+
+L<DBIx::DBSchema::Table>, L<DBIx::DBSchema>, L<DBI>
+
+=cut
+
+1;
+
+