annotate Lib/IMPL/Transform.pm @ 387:4cc6cc370fb2

DOM refactoring
author sergey
date Tue, 11 Feb 2014 01:13:47 +0400
parents 4ddb27ff4a0b
children
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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
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9 BEGIN {
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10 public _direct property templates => PROP_ALL;
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11 public _direct property default => PROP_ALL;
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12 public _direct property plain => PROP_ALL;
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13 private _direct property _cache => PROP_ALL;
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14 }
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15
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16 sub CTOR {
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17 my $this = shift;
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18 my $args = @_ == 1 ? shift : { @_ };
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19
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20 $this->{$plain} = delete $args->{-plain};
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21 $this->{$default} = delete $args->{-default};
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22
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23 $this->{$templates} = $args;
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24 }
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25
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26 sub Transform {
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27 my ($this,$object,@args) = @_;
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28
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29 if (not ref $object) {
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30 die new IMPL::Exception("There is no the template for a plain value in the transform") unless $this->{$plain};
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31 my $template = $this->{$plain};
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32 return $this->$template($object,@args);
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33 } else {
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34
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35 my $template = $this->MatchTemplate($object) || $this->default or die new IMPL::Transform::NoTransformException(ref $object);
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36
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37 return $this->ProcessTemplate($template,$object,@args);
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38 }
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39 }
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40
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41 sub MatchTemplate {
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42 my ($this,$object) = @_;
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43 my $class = $this->GetClassForObject( $object );
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44
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45 if (my $t = $this->{$_cache}->{$class} ) {
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46 return $t;
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47 } else {
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48 $t = $this->{$templates}->{$class};
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50 return $this->{$_cache}->{$class} = $t if $t;
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51
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52 {
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53 no strict 'refs';
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54
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55 my @isa = @{"${class}::ISA"};
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56
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57 while (@isa) {
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58 my $sclass = shift @isa;
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59
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60 $t = $this->{$templates}->{$sclass};
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61
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62 #cache and return
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63 return $this->{$_cache}->{$class} = $t if $t;
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65 push @isa, @{"${sclass}::ISA"};
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66 }
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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 sub ProcessTemplate {
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73 my ($this,$t,$obj,@args) = @_;
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75 return $this->$t($obj,@args);
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76 }
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77
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78 sub GetClassForObject {
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79 my ($this,$object) = @_;
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80
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81 return ref $object;
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82 }
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83
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84 package IMPL::Transform::NoTransformException;
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85 use IMPL::declare {
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86 base => {
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87 'IMPL::Exception' => sub { 'No transformation', @_ }
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88 }
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89 };
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90
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91 1;
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92
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93 __END__
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94
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95 =pod
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97 =head1 NAME
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98
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99 C<IMPL::Transform> - преобразование объектной структуры
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100
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101 =head1 SYNOPSIS
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102
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103 =begin code
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104
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105 my $obj = new AnyObject;
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106
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107 my $t = new Transform (
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108 SomeClass => sub {
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109 my ($this,$object) = @_;
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110 return new NewClass({ Name => $object->name, Document => $this->Transform($object->Data) })
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111 },
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112 DocClass => sub {
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113 my ($this,$object) = @_;
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114 return new DocPreview(Author => $object->Author, Text => $object->Data);
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115 },
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116 -default => sub {
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117 my ($this,$object) = @_;
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118 return $object;
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119 },
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120 -plain => sub {
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121 my ($this,$object) = @_;
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122 return $object;
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123 }
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124 );
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125
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126 my $result = $t->Transform($obj);
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127
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128 =end code
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129
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130 =head1 DESCRIPTION
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131
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132 Преобразование одного объекта к другому, например даных к их представлению.
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133
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134 =cut