projekt kivitendo

package SL::Template::Plugin::MultiColumnIterator;

use strict;

use base 'Template::Plugin';

use Template::Constants;

use Template::Exception;

use Template::Iterator;

use SL::LXDebug;

use Data::Dumper;

our $AUTOLOAD;

sub new {

    $main::lxdebug->enter_sub(); 

    my $class   = shift;

    my $context = shift;

    my $data    = shift || [ ];

    my $dim     = shift || 1;

    $dim        = 1 if $dim < 1;

    use vars qw(@ISA);

    push @ISA, "Template::Iterator";

    if (ref $data eq 'HASH') {

        # map a hash into a list of { key => ???, value => ??? } hashes,

        # one for each key, sorted by keys

        $data = [ map { { key => $_, value => $data->{ $_ } } }

                  sort keys %$data ];

    }

    elsif (UNIVERSAL::can($data, 'as_list')) {

        $data = $data->as_list();

    }

    elsif (ref $data ne 'ARRAY') {

        # coerce any non-list data into an array reference

        $data  = [ $data ] ;

    }

    $main::lxdebug->leave_sub(); 

    bless {

        _DATA  => $data,

        _ERROR => '',

        _DIM   => $dim,

    }, $class;

}

sub get_first {

    $main::lxdebug->enter_sub(); 

    my $self  = shift;

    my $data  = $self->{ _DATA };

    my $dim   = $self->{ _DIM  };

    $self->{ _DATASET } = $self->{ _DATA };

    my $size = int ((scalar @$data - 1) / $dim) + 1;

    my $index = 0;

    return (undef, Template::Constants::STATUS_DONE) unless $size;

    # initialise various counters, flags, etc.

    @$self{ qw( SIZE MAX INDEX COUNT FIRST LAST ) } = ( $size, $size - 1, $index, 1, 1, $size > 1 ? 0 : 1, undef );

    @$self{ qw( PREV ) } = ( undef );

    $$self{ qw( NEXT ) } = [ @{ $self->{ _DATASET }  }[ map { $index + 1 + $_ * $size } 0 .. ($dim - 1) ] ];

    $main::lxdebug->leave_sub(); 

    return [ @{ $self->{ _DATASET } }[ map { $index + $_ * $size } 0 .. ($dim - 1) ] ];

}

sub get_next {

    $main::lxdebug->enter_sub(); 

    my $self = shift;

    my ($max, $index) = @$self{ qw( MAX INDEX ) };

    my $data = $self->{ _DATASET };

    my $dim  = $self->{ _DIM  };

    my $size = $self->{ SIZE  };

    # warn about incorrect usage

    unless (defined $index) {

        my ($pack, $file, $line) = caller();

        warn("iterator get_next() called before get_first() at $file line $line\n");

        return (undef, Template::Constants::STATUS_DONE);   ## RETURN ##

    }

    # if there's still some data to go...

    if ($index < $max) {

        # update counters and flags

        $index++;

        @$self{ qw( INDEX COUNT FIRST LAST ) } = ( $index, $index + 1, 0, $index == $max ? 1 : 0 );

        $$self{ qw( PREV ) } = [ @{ $self->{ _DATASET } }[ map { $index - 1 + $_ * $size } 0 .. ($dim - 1) ] ];

        $$self{ qw( NEXT ) } = [ @{ $self->{ _DATASET } }[ map { $index + 1 + $_ * $size } 0 .. ($dim - 1) ] ];

        $main::lxdebug->leave_sub(); 

        return [ @{ $self->{ _DATASET } }[ map { $index + $_ * $size } 0 .. ($dim - 1) ] ];

    }

    else {

        $main::lxdebug->leave_sub(); 

        return (undef, Template::Constants::STATUS_DONE);   ## RETURN ##

    }

}

sub get_all {

    my $self = shift;

    my ($max, $index, $dim, $size) = @$self{ qw( MAX INDEX _DIM SIZE) };

    my (@data, $i);

    # if there's still some data to go...

    if ($index < $max) {

        $index++;

        @data = map do{ !($i = $_) || +[ @{ $self->{ _DATASET } }[ map { $i + $_ * $size } 0 .. ($dim - 1) ] ] }, $index .. $max;

        # update counters and flags

        @$self{ qw( INDEX COUNT FIRST LAST ) } = ( $max, $max + 1, 0, 1 );

        $main::lxdebug->leave_sub();

        return \@data;					    ## RETURN ##

    }

    else {

        $main::lxdebug->leave_sub();

        return (undef, Template::Constants::STATUS_DONE);   ## RETURN ##

    }

}

sub AUTOLOAD {

    my $self = shift;

    my $item = $AUTOLOAD;

    $item =~ s/.*:://;

    return if $item eq 'DESTROY';

    # alias NUMBER to COUNT for backwards compatability

    $item = 'COUNT' if $item =~ /NUMBER/i;

    return $self->{ uc $item };

}

sub dump {

    $main::lxdebug->enter_sub(); 

    my $self = shift;

    $main::lxdebug->leave_sub(); 

    return join('',

         "<pre>",

         "  Data: ", Dumper($self->{ _DATA  }), "\n",

         " Index: ", $self->{ INDEX  }, "\n",

         "Number: ", $self->{ NUMBER }, "\n",

         "   Max: ", $self->{ MAX    }, "\n",

         "  Size: ", $self->{ SIZE   }, "\n",

         " First: ", $self->{ FIRST  }, "\n",

         "  Last: ", $self->{ LAST   }, "\n",

         "\n",

         "</pre>"

     );

}

sub index {

  $main::lxdebug->enter_sub(); 

  my ($self) = @_;

  $self->{ INDEX };

  $main::lxdebug->leave_sub(); 

}

sub number {

  $main::lxdebug->enter_sub(); 

  my ($self) = @_;

  $self->{ NUMBER };

  $main::lxdebug->leave_sub(); 

}

sub max {

  $main::lxdebug->enter_sub(); 

  my ($self) = @_;

  $self->{ MAX };

  $main::lxdebug->leave_sub(); 

}

sub size {

  $main::lxdebug->enter_sub(); 

  my ($self) = @_;

  $self->{ SIZE };

  $main::lxdebug->leave_sub(); 

}

sub first {

  $main::lxdebug->enter_sub(); 

  my ($self) = @_;

  $self->{ FIRST };

  $main::lxdebug->leave_sub(); 

}

sub last {

  $main::lxdebug->enter_sub(); 

  my ($self) = @_;

  $self->{ LAST};

  $main::lxdebug->leave_sub(); 

}

1;