annotate Lib/IMPL/Transform.pm @ 251:9f394b27dccf

require can handle recursive module references
author sergey
date Fri, 16 Nov 2012 16:44:16 +0400
parents cd2b1f121029
children 4ddb27ff4a0b
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1 package IMPL::Transform;
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2 use strict;
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3
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4 use parent qw(IMPL::Object);
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5
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6 use IMPL::lang qw(:declare);
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7
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8 use IMPL::Class::Property::Direct;
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9
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10 BEGIN {
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11 public _direct property templates => PROP_ALL;
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12 public _direct property default => PROP_ALL;
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13 public _direct property plain => PROP_ALL;
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14 private _direct property _cache => PROP_ALL;
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15 }
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16
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17 sub CTOR {
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18 my $this = shift;
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19 my $args = @_ == 1 ? shift : { @_ };
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20
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21 $this->{$plain} = delete $args->{-plain};
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22 $this->{$default} = delete $args->{-default};
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23
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24 $this->{$templates} = $args;
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25 }
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26
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27 sub Transform {
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28 my ($this,$object,@args) = @_;
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29
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30 if (not ref $object) {
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31 die new IMPL::Exception("There is no the template for a plain value in the transform") unless $this->{$plain};
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32 my $template = $this->{$plain};
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33 return $this->$template($object,@args);
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34 } else {
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35
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36 my $template = $this->MatchTemplate($object) || $this->default or die new IMPL::Transform::NoTransformException(ref $object);
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37
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38 return $this->ProcessTemplate($template,$object,@args);
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39 }
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40 }
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41
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42 sub MatchTemplate {
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43 my ($this,$object) = @_;
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44 my $class = $this->GetClassForObject( $object );
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45
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46 if (my $t = $this->{$_cache}->{$class} ) {
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47 return $t;
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48 } else {
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49 $t = $this->{$templates}->{$class};
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51 return $this->{$_cache}->{$class} = $t if $t;
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52
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53 {
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54 no strict 'refs';
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55
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56 my @isa = @{"${class}::ISA"};
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57
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58 while (@isa) {
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59 my $sclass = shift @isa;
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60
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61 $t = $this->{$templates}->{$sclass};
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63 #cache and return
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64 return $this->{$_cache}->{$class} = $t if $t;
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66 push @isa, @{"${sclass}::ISA"};
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67 }
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68 ;
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69 };
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70 }
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71 }
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72
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73 sub ProcessTemplate {
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74 my ($this,$t,$obj,@args) = @_;
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75
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76 return $this->$t($obj,@args);
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77 }
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78
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79 sub GetClassForObject {
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80 my ($this,$object) = @_;
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81
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82 return ref $object;
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83 }
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84
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85 package IMPL::Transform::NoTransformException;
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86 use IMPL::declare {
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87 base => {
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88 'IMPL::Exception' => sub { 'No transformation', @_ }
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89 }
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90 };
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91
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92 1;
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93
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94 __END__
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95
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96 =pod
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98 =head1 NAME
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99
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100 C<IMPL::Transform> - преобразование объектной структуры
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101
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102 =head1 SYNOPSIS
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103
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104 =begin code
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105
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106 my $obj = new AnyObject;
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107
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108 my $t = new Transform (
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109 SomeClass => sub {
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110 my ($this,$object) = @_;
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111 return new NewClass({ Name => $object->name, Document => $this->Transform($object->Data) })
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112 },
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113 DocClass => sub {
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114 my ($this,$object) = @_;
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115 return new DocPreview(Author => $object->Author, Text => $object->Data);
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116 },
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117 -default => sub {
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118 my ($this,$object) = @_;
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119 return $object;
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120 },
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121 -plain => sub {
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122 my ($this,$object) = @_;
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123 return $object;
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124 }
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125 );
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126
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127 my $result = $t->Transform($obj);
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128
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129 =end code
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130
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131 =head1 DESCRIPTION
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132
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133 Преобразование одного объекта к другому, например даных к их представлению.
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134
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135 =cut