annotate Lib/IMPL/Config/Activator.pm @ 310:0a9d51cf6dfd

*TTView: refactoring, document supports custom classes, layouts are become controls
author sergey
date Fri, 19 Apr 2013 16:39:01 +0400
parents 8088779e539d
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1 package IMPL::Config::Activator;
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2 use strict;
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3
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4 use Scalar::Util qw(reftype);
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5 use IMPL::lang;
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6 use IMPL::Const qw(:prop);
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7 use IMPL::declare {
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8 require => {
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9 Loader => 'IMPL::Code::Loader',
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10 Exception => 'IMPL::Exception'
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11 },
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12 base => [
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13 'IMPL::Object' => undef,
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14 'IMPL::Object::Autofill' => '@_',
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15 'IMPL::Object::PublicSerializable' => undef
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16 ],
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17 props => [
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18 factory => PROP_RW,
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19 parameters => PROP_RW,
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20 singleCall => PROP_RW,
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21 _object => PROP_RW
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22 ]
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23 };
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24
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25 use constant {
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26 SELF_CLASS => __PACKAGE__,
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27 };
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28
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29 sub CTOR {
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30 my $this = shift;
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31
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32 die Exception->new("A factory parameter is required") unless $this->factory;
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33
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34 }
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36
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37 sub activate {
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38 my $this = shift;
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40 unless ($this->_object) {
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41 my @args;
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42
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43 my $params = $this->parameters;
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44 if (ref $params eq 'HASH') {
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45 while ( my ($key,$value) = each %$params ) {
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46 push @args,$key, is($value,SELF_CLASS) ? $value->activate : $value;
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47 }
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48 } elsif (ref $params eq 'ARRAY') {
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49 push @args, map is($_,SELF_CLASS) ? $_->activate : $_, @$params;
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50 } else {
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51 push @args, is($params,SELF_CLASS) ? $params->activate : $params;
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52 }
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53
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54 push @args, map is($_,SELF_CLASS) ? $_->activate : $_, @_ if @_;
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55
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56 my $factory = $this->factory;
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57 Loader->default->Require($factory)
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58 unless ref($factory);
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60 my $instance = $factory->new(@args);
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62 $this->_object($instance)
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63 unless $this->singleCall;
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64
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65 return $instance;
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66 } else {
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67 return $this->_object;
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68 }
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69 }
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71 1;
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72
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73 __END__
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74
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75 =pod
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76
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77 =head1 NAME
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78
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79 C<IMPL::Config::Activator> - объект, используемый для получения других объектов.
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80
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81 =head1 DESCRIPTION
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82
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83 Служит дополнительным уровнем абстракции в тех случаях, когда нужный объект
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84 заранее не известен или его создание должно происходить по требованию.
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85 От обычной фабрики отличается также тем, что рассматривает формальные параметры
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86 на наличие активаторов и выполняет их при активации.
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87
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88 Кроме того можно указать, что процесс активации должен происходить при каждом
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89 обращении.
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90
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91 =cut