branch for FilterColumn

diff --git a/lib/DBIx/Class/FilterColumn.pm b/lib/DBIx/Class/FilterColumn.pm
new file mode 100644 (file)
index 0000000..46aea8f
--- /dev/null
+++ b/lib/DBIx/Class/FilterColumn.pm
@@ -0,0 +1,87 @@
+package DBIx::Class::FilterColumn;
+
+use strict;
+use warnings;
+
+use base qw/DBIx::Class::Row/;
+
+sub filter_column {
+  my ($self, $col, $attrs) = @_;
+
+  $self->throw_exception("No such column $col to filter")
+    unless $self->has_column($col);
+
+  $self->throw_exception("filter_column needs attr hashref")
+    unless ref $attrs eq 'HASH';
+
+  $self->column_info($col)->{_filter_info} = $attrs;
+  my $acc = $self->column_info($col)->{accessor};
+  $self->mk_group_accessors('filtered_column' => [ (defined $acc ? $acc : $col), $col]);
+  return 1;
+}
+
+sub _filtered_column {
+  my ($self, $col, $value) = @_;
+
+  return $value unless defined $value;
+
+  my $info = $self->column_info($col)
+    or $self->throw_exception("No column info for $col");
+
+  return $value unless exists $info->{_filter_info};
+
+  my $filter = $info->{_filter_info}{filter};
+  $self->throw_exception("No inflator for $col") unless defined $filter;
+
+  return $self->$filter($value);
+}
+
+sub _unfiltered_column {
+  my ($self, $col, $value) = @_;
+
+  my $info = $self->column_info($col) or
+    $self->throw_exception("No column info for $col");
+
+  return $value unless exists $info->{_filter_info};
+
+  my $unfilter = $info->{_filter_info}{unfilter};
+  $self->throw_exception("No unfilter for $col") unless defined $unfilter;
+  return $self->$unfilter($value);
+}
+
+sub get_filtered_column {
+  my ($self, $col) = @_;
+
+  $self->throw_exception("$col is not a filtered column")
+    unless exists $self->column_info($col)->{_filter_info};
+
+  return $self->{_filtered_column}{$col}
+    if exists $self->{_filtered_column}{$col};
+
+  my $val = $self->get_column($col);
+
+  return $self->{_filtered_column}{$col} = $self->_filtered_column($col, $val);
+}
+
+sub set_filtered_column {
+  my ($self, $col, $filtered) = @_;
+
+  $self->set_column($col, $self->_unfiltered_column($col, $filtered));
+
+  delete $self->{_filtered_column}{$col};
+
+  return $filtered;
+}
+
+sub get_column {
+  my ($self, $column) = @_;
+
+  if (exists $self->{_filtered_column}{$column}) {
+    return $self->store_column($column,
+      $self->_unfiltered_column($column, $self->{_filtered_column}{$column}));
+  }
+
+  return $self->next::method($column);
+}
+
+1;