The following snippet is taken from that example I alluded to above.
# This exists to provide object-specific can() functionality.
# 1) If this is an object, check to see if the method is an element na
+me.
# 2) If either is not true, redispatch to the parent's can() method.
+ sub can
{
(
ref($_[0]) &&
UNIVERSAL::isa( $_[0]->elements, 'HASH' ) &&
exists $_[0]->elements->{$_[1]}
)
||
(
$_[0]->SUPER::can($_[1])
);
}
sub AUTOLOAD
{
(my $name = our $AUTOLOAD) =~ s/.*::([^:]+)$/$1/;
my $self = shift;
unless ($name eq lc $name || exists $self->element_classes->{lc $n
+ame})
{
return eval "$self->SUPER::$meth(@_);";
}
$self->elements->{$name} = shift if @_;
$self->elements->{$name};
}
A few notes:
- This is a container object, providing a unified interface to parsing stuff. It acts as a record and the elements are the various columns. Each record may have different columns and the goal was to provide a way of allowing the user to call the column name as a method and get the column object.
- element_classes is a method which returns a hashref of name-class pairs. The name is the name of the column as provided to this object in the constructor. The class is the class of the column.
- elements is a hashref which actually contains the column objects in name-object pairs. It is guaranteed that the names from element_classes() will be identical to the names from elements().
This implementation has the added benefit of the fact that it's currently working in production. Now, nothing inherits from it (yet) and I do not use MI in production code, for the reasons well-cited elsewhere.
------
We are the carpenters and bricklayers of the Information Age.
Then there are Damian modules.... *sigh* ... that's not about being less-lazy -- that's about being on some really good drugs -- you know, there is no spoon. - flyingmoose
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