Mercurial > pub > Impl
view Lib/IMPL/Transform.pm @ 250:129e48bb5afb
DOM refactoring
ObjectToDOM methods are virtual
QueryToDOM uses inflators
Fixed transform for the complex values in the ObjectToDOM
QueryToDOM doesn't allow to use complex values (HASHes) as values for nodes (overpost problem)
author | sergey |
---|---|
date | Wed, 07 Nov 2012 04:17:53 +0400 |
parents | cd2b1f121029 |
children | 4ddb27ff4a0b |
line wrap: on
line source
package IMPL::Transform; use strict; use parent qw(IMPL::Object); use IMPL::lang qw(:declare); use IMPL::Class::Property::Direct; BEGIN { public _direct property templates => PROP_ALL; public _direct property default => PROP_ALL; public _direct property plain => PROP_ALL; private _direct property _cache => PROP_ALL; } sub CTOR { my $this = shift; my $args = @_ == 1 ? shift : { @_ }; $this->{$plain} = delete $args->{-plain}; $this->{$default} = delete $args->{-default}; $this->{$templates} = $args; } sub Transform { my ($this,$object,@args) = @_; if (not ref $object) { die new IMPL::Exception("There is no the template for a plain value in the transform") unless $this->{$plain}; my $template = $this->{$plain}; return $this->$template($object,@args); } else { my $template = $this->MatchTemplate($object) || $this->default or die new IMPL::Transform::NoTransformException(ref $object); return $this->ProcessTemplate($template,$object,@args); } } sub MatchTemplate { my ($this,$object) = @_; my $class = $this->GetClassForObject( $object ); if (my $t = $this->{$_cache}->{$class} ) { return $t; } else { $t = $this->{$templates}->{$class}; return $this->{$_cache}->{$class} = $t if $t; { no strict 'refs'; my @isa = @{"${class}::ISA"}; while (@isa) { my $sclass = shift @isa; $t = $this->{$templates}->{$sclass}; #cache and return return $this->{$_cache}->{$class} = $t if $t; push @isa, @{"${sclass}::ISA"}; } ; }; } } sub ProcessTemplate { my ($this,$t,$obj,@args) = @_; return $this->$t($obj,@args); } sub GetClassForObject { my ($this,$object) = @_; return ref $object; } package IMPL::Transform::NoTransformException; use IMPL::declare { base => { 'IMPL::Exception' => sub { 'No transformation', @_ } } }; 1; __END__ =pod =head1 NAME C<IMPL::Transform> - преобразование объектной структуры =head1 SYNOPSIS =begin code my $obj = new AnyObject; my $t = new Transform ( SomeClass => sub { my ($this,$object) = @_; return new NewClass({ Name => $object->name, Document => $this->Transform($object->Data) }) }, DocClass => sub { my ($this,$object) = @_; return new DocPreview(Author => $object->Author, Text => $object->Data); }, -default => sub { my ($this,$object) = @_; return $object; }, -plain => sub { my ($this,$object) = @_; return $object; } ); my $result = $t->Transform($obj); =end code =head1 DESCRIPTION Преобразование одного объекта к другому, например даных к их представлению. =cut