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])
42 return $self->SUPER::FETCH( $key );
46 my $self = shift->_get_self;
47 my $key = ($self->root->{filter_store_key})
48 ? $self->root->{filter_store_key}->($_[0])
52 return $self->SUPER::STORE( $key, $value );
57 # Locate and return first key (in no particular order)
59 my $self = $_[0]->_get_self;
62 # Make sure file is open
64 if (!defined($self->fh)) { $self->_open(); }
67 # Request shared lock for reading
69 $self->lock( $self->LOCK_SH );
71 my $result = $self->_get_next_key();
75 return ($result && $self->root->{filter_fetch_key})
76 ? $self->root->{filter_fetch_key}->($result)
82 # Return next key (in no particular order), given previous one
84 my $self = $_[0]->_get_self;
86 my $prev_key = ($self->root->{filter_store_key})
87 ? $self->root->{filter_store_key}->($_[1])
90 my $prev_md5 = $DBM::Deep::DIGEST_FUNC->($prev_key);
93 # Make sure file is open
95 if (!defined($self->fh)) { $self->_open(); }
98 # Request shared lock for reading
100 $self->lock( $self->LOCK_SH );
102 my $result = $self->_get_next_key( $prev_md5 );
106 return ($result && $self->root->{filter_fetch_key})
107 ? $self->root->{filter_fetch_key}->($result)
112 # Public method aliases
114 *first_key = *FIRSTKEY;
115 *next_key = *NEXTKEY;