1 package DBM::Deep::Hash;
8 eval { tied( %{$_[0]} ) } || $_[0]
13 # Tied hash constructor method, called by Perl's tie() function.
19 $class->_throw_error( "Odd number of parameters to TIEHASH" );
23 elsif ( my $type = Scalar::Util::reftype($_[0]) ) {
24 if ( $type ne 'HASH' ) {
25 $class->_throw_error( "Not a hashref in TIEHASH" );
29 else { $args = { file => shift }; }
31 $args->{type} = $class->TYPE_HASH;
33 return $class->_init($args);
37 my $self = shift->_get_self;
38 my $key = ($self->root->{filter_store_key})
39 ? $self->root->{filter_store_key}->($_[0])
43 return $self->SUPER::STORE( $key, $value );
48 # Locate and return first key (in no particular order)
50 my $self = $_[0]->_get_self;
53 # Make sure file is open
55 if (!defined($self->fh)) { $self->_open(); }
58 # Request shared lock for reading
60 $self->lock( $self->LOCK_SH );
62 my $result = $self->_get_next_key();
66 return ($result && $self->root->{filter_fetch_key})
67 ? $self->root->{filter_fetch_key}->($result)
73 # Return next key (in no particular order), given previous one
75 my $self = $_[0]->_get_self;
77 my $prev_key = ($self->root->{filter_store_key})
78 ? $self->root->{filter_store_key}->($_[1])
81 my $prev_md5 = $DBM::Deep::DIGEST_FUNC->($prev_key);
84 # Make sure file is open
86 if (!defined($self->fh)) { $self->_open(); }
89 # Request shared lock for reading
91 $self->lock( $self->LOCK_SH );
93 my $result = $self->_get_next_key( $prev_md5 );
97 return ($result && $self->root->{filter_fetch_key})
98 ? $self->root->{filter_fetch_key}->($result)
103 # Public method aliases
105 *first_key = *FIRSTKEY;
106 *next_key = *NEXTKEY;