use strict;
+# This is to allow DBM::Deep::Array to handle negative indices on
+# its own. Otherwise, Perl would intercept the call to negative
+# indices for us. This was causing bugs for negative index handling.
+use vars qw( $NEGATIVE_INDICES );
+$NEGATIVE_INDICES = 1;
+
use base 'DBM::Deep';
+use Scalar::Util ();
+
sub _get_self {
- eval { tied( @{$_[0]} ) } || $_[0]
+ eval { local $SIG{'__DIE__'}; tied( @{$_[0]} ) } || $_[0]
}
sub TIEARRAY {
# Tied array constructor method, called by Perl's tie() function.
##
my $class = shift;
- my $args;
- if (scalar(@_) > 1) { $args = {@_}; }
- #XXX This use of ref() is bad and is a bug
- elsif (ref($_[0])) { $args = $_[0]; }
- else { $args = { file => shift }; }
+ my $args = $class->_get_args( @_ );
$args->{type} = $class->TYPE_ARRAY;
return $class->_init($args);
}
-##
-# The following methods are for arrays only
-##
+sub FETCH {
+ my $self = $_[0]->_get_self;
+ my $key = $_[1];
+
+ $self->lock( $self->LOCK_SH );
+
+ if ( $key =~ /^-?\d+$/ ) {
+ if ( $key < 0 ) {
+ $key += $self->FETCHSIZE;
+ unless ( $key >= 0 ) {
+ $self->unlock;
+ return;
+ }
+ }
+
+ $key = pack($DBM::Deep::Engine::LONG_PACK, $key);
+ }
+
+ my $rv = $self->SUPER::FETCH( $key );
+
+ $self->unlock;
+
+ return $rv;
+}
+
+sub STORE {
+ my $self = shift->_get_self;
+ my ($key, $value) = @_;
+
+ $self->lock( $self->LOCK_EX );
+
+ my $orig = $key;
+
+ my $size;
+ my $numeric_idx;
+ if ( $key =~ /^\-?\d+$/ ) {
+ $numeric_idx = 1;
+ if ( $key < 0 ) {
+ $size = $self->FETCHSIZE;
+ $key += $size;
+ if ( $key < 0 ) {
+ die( "Modification of non-creatable array value attempted, subscript $orig" );
+ }
+ }
+
+ $key = pack($DBM::Deep::Engine::LONG_PACK, $key);
+ }
+
+ my $rv = $self->SUPER::STORE( $key, $value );
+
+ if ( $numeric_idx && $rv == 2 ) {
+ $size = $self->FETCHSIZE unless defined $size;
+ if ( $orig >= $size ) {
+ $self->STORESIZE( $orig + 1 );
+ }
+ }
+
+ $self->unlock;
+
+ return $rv;
+}
+
+sub EXISTS {
+ my $self = $_[0]->_get_self;
+ my $key = $_[1];
+
+ $self->lock( $self->LOCK_SH );
+
+ if ( $key =~ /^\-?\d+$/ ) {
+ if ( $key < 0 ) {
+ $key += $self->FETCHSIZE;
+ unless ( $key >= 0 ) {
+ $self->unlock;
+ return;
+ }
+ }
+
+ $key = pack($DBM::Deep::Engine::LONG_PACK, $key);
+ }
+
+ my $rv = $self->SUPER::EXISTS( $key );
+
+ $self->unlock;
+
+ return $rv;
+}
+
+sub DELETE {
+ my $self = $_[0]->_get_self;
+ my $key = $_[1];
+
+ my $unpacked_key = $key;
+
+ $self->lock( $self->LOCK_EX );
+
+ my $size = $self->FETCHSIZE;
+ if ( $key =~ /^-?\d+$/ ) {
+ if ( $key < 0 ) {
+ $key += $size;
+ unless ( $key >= 0 ) {
+ $self->unlock;
+ return;
+ }
+ }
+
+ $key = pack($DBM::Deep::Engine::LONG_PACK, $key);
+ }
+
+ my $rv = $self->SUPER::DELETE( $key );
+
+ if ($rv && $unpacked_key == $size - 1) {
+ $self->STORESIZE( $unpacked_key );
+ }
+
+ $self->unlock;
+
+ return $rv;
+}
sub FETCHSIZE {
##
# Return the length of the array
##
- my $self = $_[0]->_get_self;
-
- my $SAVE_FILTER = $self->root->{filter_fetch_value};
- $self->root->{filter_fetch_value} = undef;
+ my $self = shift->_get_self;
+
+ $self->lock( $self->LOCK_SH );
+
+ my $SAVE_FILTER = $self->_root->{filter_fetch_value};
+ $self->_root->{filter_fetch_value} = undef;
my $packed_size = $self->FETCH('length');
- $self->root->{filter_fetch_value} = $SAVE_FILTER;
+ $self->_root->{filter_fetch_value} = $SAVE_FILTER;
- if ($packed_size) { return int(unpack($DBM::Deep::LONG_PACK, $packed_size)); }
- else { return 0; }
+ $self->unlock;
+
+ if ($packed_size) {
+ return int(unpack($DBM::Deep::Engine::LONG_PACK, $packed_size));
+ }
+
+ return 0;
}
sub STORESIZE {
my $self = $_[0]->_get_self;
my $new_length = $_[1];
- my $SAVE_FILTER = $self->root->{filter_store_value};
- $self->root->{filter_store_value} = undef;
+ $self->lock( $self->LOCK_EX );
+
+ my $SAVE_FILTER = $self->_root->{filter_store_value};
+ $self->_root->{filter_store_value} = undef;
- my $result = $self->STORE('length', pack($DBM::Deep::LONG_PACK, $new_length));
+ my $result = $self->STORE('length', pack($DBM::Deep::Engine::LONG_PACK, $new_length));
- $self->root->{filter_store_value} = $SAVE_FILTER;
+ $self->_root->{filter_store_value} = $SAVE_FILTER;
+ $self->unlock;
+
return $result;
}
# Remove and return the last element on the array
##
my $self = $_[0]->_get_self;
+
+ $self->lock( $self->LOCK_EX );
+
my $length = $self->FETCHSIZE();
if ($length) {
my $content = $self->FETCH( $length - 1 );
$self->DELETE( $length - 1 );
+
+ $self->unlock;
+
return $content;
}
else {
+ $self->unlock;
return;
}
}
# Add new element(s) to the end of the array
##
my $self = shift->_get_self;
- my $length = $self->FETCHSIZE();
+ $self->lock( $self->LOCK_EX );
+
+ my $length = $self->FETCHSIZE();
+
while (my $content = shift @_) {
$self->STORE( $length, $content );
$length++;
}
+
+ $self->unlock;
+
+ return $length;
}
sub SHIFT {
# Shift over remaining elements to take up space.
##
my $self = $_[0]->_get_self;
+
+ $self->lock( $self->LOCK_EX );
+
my $length = $self->FETCHSIZE();
if ($length) {
$self->STORE( $i, $self->FETCH($i + 1) );
}
$self->DELETE( $length - 1 );
+
+ $self->unlock;
return $content;
}
else {
+ $self->unlock;
return;
}
}
##
my $self = shift->_get_self;
my @new_elements = @_;
+
+ $self->lock( $self->LOCK_EX );
+
my $length = $self->FETCHSIZE();
my $new_size = scalar @new_elements;
for (my $i = 0; $i < $new_size; $i++) {
$self->STORE( $i, $new_elements[$i] );
}
+
+ $self->unlock;
+
+ return $length + $new_size;
}
sub SPLICE {
# Returns deleted section, or last element deleted in scalar context.
##
my $self = shift->_get_self;
+
+ $self->lock( $self->LOCK_EX );
+
my $length = $self->FETCHSIZE();
##
# Calculate offset and length of splice
##
- my $offset = shift || 0;
+ my $offset = shift;
+ $offset = 0 unless defined $offset;
if ($offset < 0) { $offset += $length; }
my $splice_length;
my @new_elements = @_;
my $new_size = scalar @new_elements;
- my @old_elements = ();
- for (my $i = $offset; $i < $offset + $splice_length; $i++) {
- push @old_elements, $self->FETCH( $i );
- }
+ my @old_elements = map {
+ $self->FETCH( $_ )
+ } $offset .. ($offset + $splice_length - 1);
##
# Adjust array length, and shift elements to accomodate new section.
$self->STORE( $i, shift @new_elements );
}
+ $self->unlock;
+
##
# Return deleted section, or last element in scalar context.
##
return wantarray ? @old_elements : $old_elements[-1];
}
-#XXX We don't need to define it.
+#XXX We don't need to define it, yet.
#XXX It will be useful, though, when we split out HASH and ARRAY
#sub EXTEND {
##
projects / dbsrgits/DBM-Deep.git / blobdiff