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 );
56 my $self = shift->_get_self;
57 my $key = ($self->root->{filter_store_key})
58 ? $self->root->{filter_store_key}->($_[0])
61 return $self->SUPER::EXISTS( $key );
66 # Locate and return first key (in no particular order)
68 my $self = $_[0]->_get_self;
71 # Make sure file is open
73 if (!defined($self->fh)) { $self->_open(); }
76 # Request shared lock for reading
78 $self->lock( $self->LOCK_SH );
80 my $result = $self->_get_next_key();
84 return ($result && $self->root->{filter_fetch_key})
85 ? $self->root->{filter_fetch_key}->($result)
91 # Return next key (in no particular order), given previous one
93 my $self = $_[0]->_get_self;
95 my $prev_key = ($self->root->{filter_store_key})
96 ? $self->root->{filter_store_key}->($_[1])
99 my $prev_md5 = $DBM::Deep::DIGEST_FUNC->($prev_key);
102 # Make sure file is open
104 if (!defined($self->fh)) { $self->_open(); }
107 # Request shared lock for reading
109 $self->lock( $self->LOCK_SH );
111 my $result = $self->_get_next_key( $prev_md5 );
115 return ($result && $self->root->{filter_fetch_key})
116 ? $self->root->{filter_fetch_key}->($result)
121 # Public method aliases
123 *first_key = *FIRSTKEY;
124 *next_key = *NEXTKEY;