annotate Lib/IMPL/Class/Meta.pm @ 276:8a5da17d7ef9

*IMPL::Class refactoring property definition mechanism (incomplete).
author sergey
date Thu, 31 Jan 2013 17:37:44 +0400
parents 0f59b2de72af
children af8af4b8337e
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1 package IMPL::Class::Meta;
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2 use strict;
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3
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4 use Carp qw(carp);
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5 use IMPL::clone qw(clone);
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6
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7 my %class_meta;
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8 my %class_data;
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9
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10 sub SetMeta {
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11 my ($class,$meta_data) = @_;
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12 $class = ref $class if ref $class;
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13
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14 # тут нельзя использовать стандартное исключение, поскольку для него используется
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15 # класс IMPL::Object::Accessor, который наследуется от текущего класса
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16 die "The meta_data parameter should be an object" if not ref $meta_data;
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17
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18 push @{$class_meta{$class}{ref $meta_data}},$meta_data;
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19 }
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20
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21 sub set_meta {
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22 goto &SetMeta;
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23 }
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24
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25 sub GetMeta {
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26 my ($class,$meta_class,$predicate,$deep) = @_;
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27 $class = ref $class if ref $class;
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28 no strict 'refs';
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29 my @result;
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30
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31 if ($deep) {
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32 @result = map { $_->can('get_meta') ? $_->get_meta($meta_class,$predicate,$deep) : () } @{$class.'::ISA'};
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33 }
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34
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35 if ($predicate) {
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36 push @result,grep( &$predicate($_), map( @{$class_meta{$class}{$_}}, grep( $_->isa($meta_class), keys %{$class_meta{$class} || {}} ) ) );
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37 } else {
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38 push @result, map( @{$class_meta{$class}{$_} || []}, grep( $_->isa($meta_class), keys %{$class_meta{$class} || {}} ) );
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39 }
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40 wantarray ? @result : \@result;
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41 }
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42
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43 sub get_meta {
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44 goto &GetMeta;
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45 }
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46
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47 sub class_data {
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48 my $class = shift;
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49 $class = ref $class || $class;
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50
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51 carp 'The method is obsolete, use static_accessor($name,$value,\'clone\') instead';
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52
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53 if (@_ > 1) {
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54 my ($name,$value) = @_;
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55 return $class_data{$class}{$name} = $value;
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56 } else {
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57 my ($name) = @_;
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58
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59 if( exists $class_data{$class}{$name} ) {
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60 $class_data{$class}{$name};
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61 } else {
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62 if ( my $value = $class->_find_class_data($name) ) {
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63 $class_data{$class}{$name} = clone($value);
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64 } else {
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65 undef;
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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 sub static_accessor {
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72 my ($class,$name,$value,$inherit) = @_;
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73
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74 $inherit ||= 'inherit';
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75
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76 my $method = "static_accessor_$inherit";
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77
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78 return $class->$method($name,$value);
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79 }
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80
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81 sub static_accessor_clone {
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82 my ($class,$name,$value) = @_;
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83 $class = ref $class || $class;
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84
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85 no strict 'refs';
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86
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87 *{"${class}::${name}"} = sub {
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88 my $self = shift;
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89
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90 $self = ref $self || $self;
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91
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92 if (@_ > 0) {
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93 if ($class ne $self) {
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94 $self->static_accessor_clone( $name => $_[0] ); # define own class data
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95 } else {
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96 $value = $_[0];
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97 }
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98 } else {
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99 return $self ne $class
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100 ? $self->static_accessor_clone($name => clone($value))
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101 : $value;
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102 }
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103 };
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104 return $value;
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105 };
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106
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107 sub static_accessor_inherit {
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108 my ($class,$name,$value) = @_;
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109
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110 no strict 'refs';
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111
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112 *{"${class}::$name"} = sub {
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113 my $self = shift;
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114
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115 if (@_ > 0) {
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116 $self = ref $self || $self;
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117
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118 if ($class ne $self) {
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119 $self->static_accessor_inherit( $name => $_[0] ); # define own class data
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120 } else {
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121 $value = $_[0];
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122 }
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123 } else {
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124 $value ;
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125 }
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126 };
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127 return $value;
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128 }
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129
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130 sub static_accessor_own {
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131 my ($class,$name,$value) = @_;
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132
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133 no strict 'refs';
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134
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135 *{"${class}::$name"} = sub {
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136 my $self = shift;
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137 $self = ref $self || $self;
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138
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139 if ($class ne $self) {
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140 if (@_ > 0) {
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141 $self->static_accessor_own( $name => $_[0] ); # define own class data
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142 } else {
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143 return;
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144 }
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145 } else {
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146 if ( @_ > 0 ) {
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147 $value = $_[0];
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148 } else {
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149 return $value;
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150 }
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151 }
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152 };
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153
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154 return $value;
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155 }
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156
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157 sub _find_class_data {
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158 my ($class,$name) = @_;
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159
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160 no strict 'refs';
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161
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162 exists $class_data{$_}{$name} and return $class_data{$_}{$name} foreach @{"${class}::ISA"};
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163
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164 my $val;
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165 $val = $_->can('_find_class_data') ? $_->_find_class_data($name) : undef and return $val foreach @{"${class}::ISA"};
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166 }
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167
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168 1;
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169
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170 __END__
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171
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172 =pod
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173
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174 =head1 NAME
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175
180
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176 C<IMPL::Class::Meta> - информация хранимая на уровне класса.
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177
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178 =head1 SYNOPSIS
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179
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180 =begin code
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181
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182 package InfoMeta;
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183
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184 use parent qw(IMPL::Object IMPL::Object::Autofill);
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185 use IMPL::Class::Property;
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186
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187 __PACKAGE__->PassThroughArgs;
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188
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189 BEGIN {
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190 public property name => prop_get | owner_set;
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191 }
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192
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193 package InfoExMeta;
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194 use parent qw(InfoMeta);
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195
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196 __PACKAGE__->PassThroughArgs;
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197
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198 BEGIN {
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199 public property description => prop_all;
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200 }
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201
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202 package Foo;
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203
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204 __PACKAGE__->set_meta(new InfoMeta(name => 'info'));
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205 __PACKAGE__->set_meta(new InfoExMeta(name => 'infoEx', description => 'extended info' ));
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206
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207 package main;
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208
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209 # get all InfoMeta, InfoExMeta will be included, becouse it's derived from InfoMeta
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210 my @info = Foo->get_meta('InfoMeta'); # will get two objects, 'info' and 'infoEx';
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211
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212 # get all InfoExMeta meta
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213 @info = Foo->get_meta('InfoExMeta'); # will get only 'infoEx'
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214
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215 # get filtered meta
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216 @info = Foo->get_meta('InfoMeta', sub { $_->name eq 'info'} ); # will get only 'info'
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217
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218 =end code
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219
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220 =head1 DESCRIPTION
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221
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222 Позвоялет расширять информацию о типах (класса) при помощи метаданных, метаданными являются любые объекты,
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223 притом выборка метаданных приоизводится по их типу (классу), что позволяет выбрать все однотипные метаданные.
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224
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225 Существует возможность выборки метаданных с учетом унаследованных от базовых классов
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226
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227 =head1 MEMBERS
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228
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229 =head2 C<set_meta($meta_data)>
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230
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231 Добавляет метаданные C<$meta_data> к классу.
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232
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233 =head2 C<get_meta($meta_class,$predicate,$deep)>
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234
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235 Выбирает метаданные типа C<$meta_class> и его наследников, с возможностью фильтрации и получения
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236 метаданных базовых классов.
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237
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238 =over
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239
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240 =item C<$meta_class>
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241
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242 Тип метаданных
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243
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244 =item C<$predicate>
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245
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246 Подпрограмма, которая будет вызываться для каждых найденных метаданных и на основе результата
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247 ее выполнения метаданные будут включены в результат или нет. Получеат в качестве параметра
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248 объект с метаданными, возвращает C<true> - включить метаданные в результа, C<false> - пропустить
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249 метаданные как не подходящие. Также переменная C<$_> ссылается на текущий объект с метаданными.
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250
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251 =begin code
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252
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253 my @info = Foo->get_meta(
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254 'InfoMeta',
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255 sub { ref $_ eq 'InfoMeta'}, # exclude subclasses ('InfoExMeta')
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256 1 # deep search
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257 );
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258
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259 my @info = Foo->get_meta(
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260 'InfoMeta',
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261 sub {
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262 my $item = shift;
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263 ref $item eq 'InfoMeta' # exclude subclasses ('InfoExMeta')
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264 },
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265 1 # deep search
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266 );
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267
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268 =end code
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269
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270 =item C<$deep>
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271
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272 Осуществлять поиск по базовым классам.
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273
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274 =back
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275
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276 =head2 C<static_accessor($name[,$value[,$inherit]])>
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277
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278 Создает статическое свойство с именем C<$name> и начальным значением C<$value>.
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279
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280 Параметр C<$inherit> контролирует то, как наследуются значения.
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281
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282 =over
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283
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284 =item * C<inherit>
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285
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286 По умолчанию. Означает, что если для класса не определено значение, оно будет
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287 получено от родителя.
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288
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289 =item * C<clone>
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290
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291 Если для класса не определено значение, то оно будет клонировано из
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292 родительского значения при первом обращении. Полезно, когда родитель задает
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293 значение по-умолчанию, которое разделяется между несколькими потомками,
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294 которые модифицирю само значение (например значением является ссылка на хеш,
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295 а потомки добавляют или меняют значения в этом хеше).
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296
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297 =item * C<own>
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298
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299 Каждый класс имеет свое собственное значение не зависящее от того, что было
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300 у предка. Начальное значение для этого статического свойства C<undef>.
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301
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302 =back
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303
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304 Данный метод является заглушкой, он передает управление
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305 C<static_accessor_inherit>, C<static_accessor_clone>, C<static_accessor_own>
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306 соответственно. Эти методы можно вызывать явно
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307 C<static_accessor_*($name[,$value])>.
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308
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309
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310 =begin code
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311
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312 package Foo;
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313 use parent qw(IMPL::Class::Meta);
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314
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315 __PACKAGE__->static_accessor( info => { version => 1 } );
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316 __PACKAGE__->static_accessor( mappings => { toString => \&ToString }, 'clone' );
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317 __PACKAGE__->static_accessor( _instance => undef, 'own' );
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318
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319 sub ToString {
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320 "[object Foo]";
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321 }
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322
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323 sub default {
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324 my ($self) = @_;
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325
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326 $self = ref $self || $self;
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327 return $self->_instance ? $self->_instance : $self->_instance($self->new());
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328 }
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329
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330 package Bar;
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331 use parent qw(Foo);
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332
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333 __PACKAGE__->info({language => 'English', version => 2}); # will define own 'info' but will loose original data.
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334 __PACKAGE__->mappings->{sayHello} = \&SayHello; # will not affect Foo->mappings;
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335
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336 package main;
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337
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338 my $foo = Foo->default; # will be a Foo object
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339 my $bar = Bar->default; # will be a Bar object
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340
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341 =end code
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342
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343 =cut