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=head1 NAME |
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DR::Tarantool::Iterator - an iterator and a container class for |
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L<DR::Tarantool> |
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=head1 SYNOPSIS |
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use DR::Tarantool::Iterator; |
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my $iter = DR::Tarantool::Iterator->new([1, 2, 3]); |
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my $item0 = $iter->item(0); |
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my @all = $iter->all; |
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my $all = $iter->all; |
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while(my $item = $iter->next) { |
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do_something_with_item( $item ); |
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} |
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=head1 METHODS |
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=cut |
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use utf8; |
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use strict; |
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use warnings; |
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package DR::Tarantool::Iterator; |
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use Carp; |
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use Data::Dumper; |
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=head2 new |
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A constructor. |
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=head3 Arguments |
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=over |
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=item * |
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An array of tuples to iterate over. |
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=item * |
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A list of named arguments: |
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=over |
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=item item_class |
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Name of the class to bless each tuple in the iterator with. |
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If the field is 'B<ARRAYREF>' then the first element of the array is |
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B<item_class>, and the second element is B<item_constructor>. |
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=item item_constructor |
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Name of a constructor to invoke for each tuple. If this value is |
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undefined and B<item_class> is defined, the iterator blesses each |
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tuple but does not invoke a constructor on it. |
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The constructor is invoked on with three arguments: B<item>, |
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B<item_index> and B<iterator>, for example: |
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my $iter = DR::Tarantool::Iterator->new( |
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[ [1], [2], [3] ], |
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item_class => 'MyClass', |
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item_constructor => 'new' |
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); |
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my $iter = DR::Tarantool::Iterator->new( # the same |
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[ [1], [2], [3] ], |
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item_class => [ 'MyClass', 'new' ] |
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); |
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my $item = $iter->item(0); |
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my $item = MyClass->new( [1], 0, $iter ); # the same |
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my $item = $iter->item(2); |
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my $item = MyClass->new( [3], 2, $iter ); # the same |
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=item data |
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Application state to store in the iterator. Is useful |
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if additional state needs to be passed into tuple constructor. |
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=back |
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=back |
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=cut |
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sub new { |
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my ($class, $items, %opts) = @_; |
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101
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croak 'usage: DR::Tarantool::Iterator->new([$item1, $item2, ... ], %opts)' |
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unless 'ARRAY' eq ref $items; |
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105
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my $self = bless { items => $items } => ref($class) || $class; |
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$self->item_class( |
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('ARRAY' eq ref $opts{item_class}) ? |
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@{ $opts{item_class} } : $opts{item_class} |
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) if exists $opts{item_class}; |
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$self->item_constructor($opts{item_constructor}) |
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if exists $opts{item_constructor}; |
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$self->data( $opts{data} ) if exists $opts{data}; |
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$self; |
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} |
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119
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120
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=head2 clone(%opt) |
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Clone the iterator object, but do not clone the tuples. |
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This method can be used to create an iterator that has |
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a different B<item_class> and (or) B<item_constructor>. |
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If B<clone_items> argument is true, the function clones the tuple |
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list as well. |
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129
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my $iter1 = $old_iter->clone(item_class => [ 'MyClass', 'new' ]); |
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my $iter2 = $old_iter->clone(item_class => [ 'MyClass', 'new' ], |
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clone_items => 1); |
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$old_iter->sort(sub { $_[0]->name cmp $_[1]->name }); |
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# $iter1 is sorted, too, but $iter2 is not |
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136
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=cut |
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138
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sub clone { |
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140
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1
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my $self = shift; |
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my %opts; |
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if (@_ == 1) { |
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%opts = (clone_items => shift); |
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} else { |
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%opts = @_; |
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} |
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148
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10
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my %pre = ( |
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data => $self->data, |
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item_class => $self->item_class, |
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item_constructor => $self->item_constructor |
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); |
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154
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my $clone_items = delete $opts{clone_items}; |
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my $items = $clone_items ? [ @{ $self->{items} } ] : $self->{items}; |
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157
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$self = $self->new( $items, %pre, %opts ); |
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$self; |
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} |
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161
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162
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=head2 count |
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164
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Return the number of tuples available through the iterator. |
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166
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=cut |
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168
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sub count { |
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548
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1
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2023
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my ($self) = @_; |
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480
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return scalar @{ $self->{items} }; |
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1511
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} |
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174
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=head2 item |
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176
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Return one tuple from the iterator by its index |
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(or croak an error if the index is out of range). |
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179
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=cut |
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181
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sub item { |
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1
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3023
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my ($self, $no) = @_; |
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184
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288
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my $item = $self->raw_item( $no ); |
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186
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if (my $class = $self->item_class) { |
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188
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if (my $m = $self->item_constructor) { |
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return $class->$m( $item, $no, $self ); |
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} |
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192
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4
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10
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return bless $item => $class if ref $item; |
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4
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24
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return bless \$item => $class; |
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} |
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196
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252
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return $self->{items}[ $no ]; |
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} |
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199
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200
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=head2 raw_item |
201
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202
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Return one raw tuple from the iterator by its index |
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(or croak error if the index is out of range). |
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205
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In other words, this method ignores B<item_class> and B<item_constructor>. |
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207
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=cut |
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209
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sub raw_item { |
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1
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186
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my ($self, $no) = @_; |
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212
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172
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294
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my $exists = $self->exists($no); |
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172
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563
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croak "wrong item number format: " . (defined($no) ? $no : 'undef') |
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100
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214
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unless defined $exists; |
215
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170
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533
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croak 'wrong item number: ' . $no unless $exists; |
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217
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168
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237
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if ($no >= 0) { |
218
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164
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255
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croak "iterator doesn't contain item with number $no" |
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unless $no < $self->count; |
220
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} else { |
221
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4
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50
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11
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croak "iterator doesn't contain item with number $no" |
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unless $no >= -$self->count; |
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} |
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225
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168
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393
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return $self->{items}[ $no ]; |
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} |
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=head2 raw_sort(&) |
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Sort the contents referred to by the iterator (changes the current |
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iterator object). |
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The compare function receives two B<raw> objects: |
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$iter->raw_sort(sub { $_[0]->field cmp $_[1]->field }); |
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=cut |
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sub raw_sort { |
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my ($self, $cb) = @_; |
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my $items = $self->{items}; |
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@$items = sort { &$cb($a, $b) } @$items; |
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return $self; |
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} |
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=head2 sort(&) |
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Sort the contents referred to by the iterator (changes the current object). |
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The compare function receives two constructed objects: |
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$iter->sort(sub { $_[0]->field <=> $_[1]->field }); |
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=cut |
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sub sort : method { |
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my ($self, $cb) = @_; |
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my $items = $self->{items}; |
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my @bitems = map { $self->item( $_ ) } 0 .. $#$items; |
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259
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my @isorted = sort { &$cb( $bitems[$a], $bitems[$b] ) } 0 .. $#$items; |
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@$items = @$items[ @isorted ]; |
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return $self; |
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} |
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=head2 grep(&) |
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268
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Find all objects in the set referred to by the iterator that |
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match a given search criteria (linear search). |
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my $admins = $users->grep(sub { $_[0]->is_admin }); |
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=cut |
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275
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sub grep :method { |
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1
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6
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my ($self, $cb) = @_; |
277
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5
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my $items = $self->{items}; |
278
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3
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8
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my @bitems = map { $self->item( $_ ) } 0 .. $#$items; |
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18
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57
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279
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3
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14
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my @igrepped = grep { &$cb( $bitems[$_] ) } 0 .. $#$items; |
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18
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64
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280
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3
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15
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@igrepped = @$items[ @igrepped ]; |
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282
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7
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return $self->new( |
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\@igrepped, |
284
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item_class => $self->item_class, |
285
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item_constructor => $self->item_constructor, |
286
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data => $self->data |
287
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); |
288
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} |
289
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290
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291
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=head2 raw_grep(&) |
292
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293
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Same as grep, but works on raw objects. |
294
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295
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my $admins = $users->raw_grep(sub { $_[0]->is_admin }); |
296
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297
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=cut |
298
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299
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sub raw_grep :method { |
300
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1
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1
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1
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9
|
my ($self, $cb) = @_; |
301
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1
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3
|
my $items = $self->{items}; |
302
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1
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3
|
my @igrepped = grep { &$cb($_) } @$items; |
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6
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20
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303
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304
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1
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7
|
return $self->new( |
305
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|
\@igrepped, |
306
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|
item_class => $self->item_class, |
307
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item_constructor => $self->item_constructor, |
308
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data => $self->data |
309
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); |
310
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} |
311
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312
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313
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=head2 get |
314
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315
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|
An alias for L<item> method. |
316
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317
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=cut |
318
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319
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0
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0
|
1
|
0
|
sub get { goto \&item; } |
320
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321
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322
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|
=head2 exists |
323
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324
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|
Return B<true> if the iterator contains a tuple with the given |
325
|
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|
|
index. |
326
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327
|
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|
|
my $item = $iter->exists(10) ? $iter->get(10) : somethig_else(); |
328
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329
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|
=cut |
330
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331
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|
sub exists : method{ |
332
|
172
|
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172
|
1
|
178
|
my ($self, $no) = @_; |
333
|
172
|
100
|
|
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|
317
|
return undef unless defined $no; |
334
|
171
|
100
|
|
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|
641
|
return undef unless $no =~ /^-?\d+$/; |
335
|
170
|
100
|
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|
287
|
return 0 if $no >= $self->count; |
336
|
169
|
100
|
|
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|
276
|
return 0 if $no < -$self->count; |
337
|
168
|
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|
264
|
return 1; |
338
|
|
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|
|
} |
339
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|
340
|
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341
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|
|
=head2 next |
342
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343
|
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|
|
Return the next tuple, or B<undef> in case of eof. |
344
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345
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|
|
while(my $item = $iter->next) { |
346
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|
|
do_something_with( $item ); |
347
|
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|
} |
348
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349
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|
|
Index of the current tuple can be queried with function 'L<iter>'. |
350
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351
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|
|
=cut |
352
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353
|
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|
|
sub next :method { |
354
|
120
|
|
|
120
|
1
|
10459
|
my ($self) = @_; |
355
|
120
|
|
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|
|
216
|
my $iter = $self->iter; |
356
|
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357
|
120
|
100
|
|
|
|
232
|
if (defined $self->{iter}) { |
358
|
90
|
|
|
|
|
281
|
return $self->item(++$self->{iter}) |
359
|
90
|
100
|
|
|
|
142
|
if $self->iter < $#{ $self->{items} }; |
360
|
21
|
|
|
|
|
38
|
delete $self->{iter}; |
361
|
21
|
|
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|
56
|
return undef; |
362
|
|
|
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|
|
|
} |
363
|
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|
|
364
|
30
|
100
|
|
|
|
57
|
return $self->item($self->{iter} = 0) if $self->count; |
365
|
1
|
|
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|
|
3
|
return undef; |
366
|
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|
|
} |
367
|
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|
368
|
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|
369
|
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|
|
=head2 iter |
370
|
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|
|
371
|
|
|
|
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|
|
Return index of the tuple at the current iterator position. |
372
|
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|
|
373
|
|
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|
|
=cut |
374
|
|
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|
|
|
|
|
375
|
|
|
|
|
|
|
sub iter { |
376
|
210
|
|
|
210
|
1
|
186
|
my ($self) = @_; |
377
|
210
|
|
|
|
|
292
|
return $self->{iter}; |
378
|
|
|
|
|
|
|
} |
379
|
|
|
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|
|
|
|
380
|
|
|
|
|
|
|
|
381
|
|
|
|
|
|
|
=head2 reset |
382
|
|
|
|
|
|
|
|
383
|
|
|
|
|
|
|
Reset iteration index, return the previous value of the index. |
384
|
|
|
|
|
|
|
|
385
|
|
|
|
|
|
|
=cut |
386
|
|
|
|
|
|
|
|
387
|
|
|
|
|
|
|
sub reset :method { |
388
|
3
|
|
|
3
|
1
|
2492
|
my ($self) = @_; |
389
|
3
|
|
|
|
|
10
|
return delete $self->{iter}; |
390
|
|
|
|
|
|
|
} |
391
|
|
|
|
|
|
|
|
392
|
|
|
|
|
|
|
|
393
|
|
|
|
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|
|
=head2 all |
394
|
|
|
|
|
|
|
|
395
|
|
|
|
|
|
|
Return all tuples available through the iterator. |
396
|
|
|
|
|
|
|
|
397
|
|
|
|
|
|
|
my @list = $iter->all; |
398
|
|
|
|
|
|
|
my $list_aref = $iter->all; |
399
|
|
|
|
|
|
|
|
400
|
|
|
|
|
|
|
my @abc_list = map { $_->abc } $iter->all; |
401
|
|
|
|
|
|
|
my @abc_list = $iter->all('abc'); # the same |
402
|
|
|
|
|
|
|
|
403
|
|
|
|
|
|
|
|
404
|
|
|
|
|
|
|
my @list = map { [ $_->abc, $_->cde ] } $iter->all; |
405
|
|
|
|
|
|
|
my @list = $iter->all('abc', 'cde'); # the same |
406
|
|
|
|
|
|
|
|
407
|
|
|
|
|
|
|
|
408
|
|
|
|
|
|
|
my @list = map { $_->abc + $_->cde } $iter->all; |
409
|
|
|
|
|
|
|
my @list = $iter->all(sub { $_[0]->abc + $_->cde }); # the same |
410
|
|
|
|
|
|
|
|
411
|
|
|
|
|
|
|
=cut |
412
|
|
|
|
|
|
|
|
413
|
|
|
|
|
|
|
sub all { |
414
|
16
|
|
|
16
|
1
|
974
|
my ($self, @items) = @_; |
415
|
|
|
|
|
|
|
|
416
|
16
|
50
|
|
|
|
36
|
return unless defined wantarray; |
417
|
16
|
|
|
|
|
19
|
my @res; |
418
|
|
|
|
|
|
|
|
419
|
16
|
|
|
|
|
29
|
local $self->{iter}; |
420
|
|
|
|
|
|
|
|
421
|
|
|
|
|
|
|
|
422
|
16
|
100
|
|
|
|
37
|
if (@items == 1) { |
|
|
100
|
|
|
|
|
|
423
|
2
|
|
|
|
|
4
|
my $m = shift @items; |
424
|
|
|
|
|
|
|
|
425
|
2
|
|
|
|
|
8
|
while (defined(my $i = $self->next)) { |
426
|
6
|
|
|
|
|
68
|
push @res => $i->$m; |
427
|
|
|
|
|
|
|
} |
428
|
|
|
|
|
|
|
} elsif (@items) { |
429
|
1
|
|
|
|
|
4
|
while (defined(my $i = $self->next)) { |
430
|
3
|
|
|
|
|
5
|
push @res => [ map { $i->$_ } @items ]; |
|
6
|
|
|
|
|
17
|
|
431
|
|
|
|
|
|
|
} |
432
|
|
|
|
|
|
|
} else { |
433
|
13
|
|
|
|
|
27
|
while (defined(my $i = $self->next)) { |
434
|
56
|
|
|
|
|
128
|
push @res => $i; |
435
|
|
|
|
|
|
|
} |
436
|
|
|
|
|
|
|
} |
437
|
|
|
|
|
|
|
|
438
|
16
|
100
|
|
|
|
63
|
return @res if wantarray; |
439
|
10
|
|
|
|
|
49
|
return \@res; |
440
|
|
|
|
|
|
|
} |
441
|
|
|
|
|
|
|
|
442
|
|
|
|
|
|
|
|
443
|
|
|
|
|
|
|
|
444
|
|
|
|
|
|
|
=head2 item_class |
445
|
|
|
|
|
|
|
|
446
|
|
|
|
|
|
|
Set/return the tuple class. If the value is defined, the iterator |
447
|
|
|
|
|
|
|
blesses tuples with it (and also calls L<item_constructor> if it is set). |
448
|
|
|
|
|
|
|
|
449
|
|
|
|
|
|
|
=cut |
450
|
|
|
|
|
|
|
|
451
|
|
|
|
|
|
|
sub item_class { |
452
|
164
|
|
|
164
|
1
|
1098
|
my ($self, $v, $m) = @_; |
453
|
164
|
100
|
|
|
|
339
|
$self->item_constructor($m) if @_ > 2; |
454
|
164
|
100
|
66
|
|
|
389
|
return $self->{item_class} = ref($v) || $v if @_ > 1; |
455
|
139
|
|
|
|
|
347
|
return $self->{item_class}; |
456
|
|
|
|
|
|
|
} |
457
|
|
|
|
|
|
|
|
458
|
|
|
|
|
|
|
|
459
|
|
|
|
|
|
|
=head2 item_constructor |
460
|
|
|
|
|
|
|
|
461
|
|
|
|
|
|
|
Set/return the tuple constructor. |
462
|
|
|
|
|
|
|
The value is used only if L<item_class> is defined. |
463
|
|
|
|
|
|
|
|
464
|
|
|
|
|
|
|
=cut |
465
|
|
|
|
|
|
|
|
466
|
|
|
|
|
|
|
sub item_constructor { |
467
|
75
|
|
|
75
|
1
|
90
|
my ($self, $v) = @_; |
468
|
75
|
100
|
|
|
|
171
|
return $self->{item_constructor} = $v if @_ > 1; |
469
|
51
|
|
|
|
|
138
|
return $self->{item_constructor}; |
470
|
|
|
|
|
|
|
} |
471
|
|
|
|
|
|
|
|
472
|
|
|
|
|
|
|
|
473
|
|
|
|
|
|
|
=head2 push |
474
|
|
|
|
|
|
|
|
475
|
|
|
|
|
|
|
Push a tuple into the iterator. |
476
|
|
|
|
|
|
|
|
477
|
|
|
|
|
|
|
=cut |
478
|
|
|
|
|
|
|
|
479
|
|
|
|
|
|
|
sub push :method { |
480
|
2
|
|
|
2
|
1
|
3
|
my ($self, @i) = @_; |
481
|
2
|
|
|
|
|
4
|
push @{ $self->{items}} => @i; |
|
2
|
|
|
|
|
5
|
|
482
|
2
|
|
|
|
|
4
|
return $self; |
483
|
|
|
|
|
|
|
} |
484
|
|
|
|
|
|
|
|
485
|
|
|
|
|
|
|
|
486
|
|
|
|
|
|
|
=head2 data |
487
|
|
|
|
|
|
|
|
488
|
|
|
|
|
|
|
Return/set an application-specific context maintained in the iterator |
489
|
|
|
|
|
|
|
object. This can be useful to pass additional state to B<item_constructor>. |
490
|
|
|
|
|
|
|
|
491
|
|
|
|
|
|
|
=cut |
492
|
|
|
|
|
|
|
|
493
|
|
|
|
|
|
|
sub data { |
494
|
29
|
|
|
29
|
1
|
37
|
my ($self, $data) = @_; |
495
|
29
|
100
|
|
|
|
69
|
$self->{data} = $data if @_ > 1; |
496
|
29
|
|
|
|
|
69
|
return $self->{data}; |
497
|
|
|
|
|
|
|
} |
498
|
|
|
|
|
|
|
|
499
|
|
|
|
|
|
|
1; |