annotate lib/IMPL/Class/Meta.pm @ 418:3f38dabaf5cc ref20150831

sync
author cin
date Mon, 28 Dec 2015 15:11:35 +0300
parents ee36115f6a34
children
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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 confess);
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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 || $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 confess "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 $class;
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28 no strict 'refs';
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29 my @result;
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30
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31 if ($predicate) {
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32 push @result,grep( &$predicate($_), map( @{$class_meta{$class}{$_}}, grep( $_->isa($meta_class), keys %{$class_meta{$class} || {}} ) ) );
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33 } else {
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34 push @result, map( @{$class_meta{$class}{$_} || []}, grep( $_->isa($meta_class), keys %{$class_meta{$class} || {}} ) );
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35 }
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36
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37 if ($deep) {
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38 push @result, map { $_->can('GetMeta') ? $_->GetMeta($meta_class,$predicate,$deep) : () } @{$class.'::ISA'};
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39 }
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40
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41 wantarray ? @result : \@result;
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42 }
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43
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44 sub get_meta {
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45 goto &GetMeta;
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46 }
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47
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48 sub class_data {
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49 my $class = shift;
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50 $class = ref $class || $class;
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51
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52 carp 'The method is obsolete, use static_accessor($name,$value,\'clone\') instead';
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53
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54 if (@_ > 1) {
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55 my ($name,$value) = @_;
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56 return $class_data{$class}{$name} = $value;
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57 } else {
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58 my ($name) = @_;
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59
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60 if( exists $class_data{$class}{$name} ) {
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61 $class_data{$class}{$name};
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62 } else {
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63 if ( my $value = $class->_find_class_data($name) ) {
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64 $class_data{$class}{$name} = clone($value);
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65 } else {
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66 undef;
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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 static_accessor {
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73 my ($class,$name,$value,$inherit) = @_;
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74
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75 $inherit ||= 'inherit';
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76
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77 my $method = "static_accessor_$inherit";
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78
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79 return $class->$method($name,$value);
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80 }
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81
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82 sub static_accessor_clone {
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83 my ($class,$name,$value) = @_;
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84 $class = ref $class || $class;
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85
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86 no strict 'refs';
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87
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88 *{"${class}::${name}"} = sub {
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89 my $self = shift;
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90
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91 $self = ref $self || $self;
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92
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93 if (@_ > 0) {
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94 if ($class ne $self) {
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95 static_accessor_clone($self, $name => $_[0] ); # define own class data
407
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96 } else {
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97 $value = $_[0];
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98 }
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99 } else {
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100 return $self ne $class
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101 ? static_accessor_clone($self, $name => clone($value))
407
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102 : $value;
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103 }
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104 };
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105 return $value;
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106 };
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107
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108 sub static_accessor_inherit {
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109 my ($class,$name,$value) = @_;
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110
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111 no strict 'refs';
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112
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113 *{"${class}::$name"} = sub {
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114 my $self = shift;
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115
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116 if (@_ > 0) {
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117 $self = ref $self || $self;
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118
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119 if ($class ne $self) {
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120 static_accessor_inherit($self, $name => $_[0] ); # define own class data
407
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121 } else {
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122 $value = $_[0];
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123 }
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124 } else {
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125 $value ;
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126 }
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127 };
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128 return $value;
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129 }
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130
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131 sub static_accessor_own {
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132 my ($class,$name,$value) = @_;
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133
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134 no strict 'refs';
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135
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136 *{"${class}::$name"} = sub {
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137 my $self = shift;
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138 $self = ref $self || $self;
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139
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140 if ($class ne $self) {
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141 if (@_ > 0) {
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142 static_accessor_own($self, $name => $_[0] ); # define own class data
407
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143 } else {
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144 return;
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145 }
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146 } else {
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147 if ( @_ > 0 ) {
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148 $value = $_[0];
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149 } else {
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150 return $value;
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151 }
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152 }
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153 };
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154
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155 return $value;
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156 }
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157
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158 sub _find_class_data {
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159 my ($class,$name) = @_;
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160
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161 no strict 'refs';
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162
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163 exists $class_data{$_}{$name} and return $class_data{$_}{$name} foreach @{"${class}::ISA"};
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164
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165 my $val;
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166 $val = $_->can('_find_class_data') ? $_->_find_class_data($name) : undef and return $val foreach @{"${class}::ISA"};
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167 }
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168
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169 1;
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170
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171 __END__
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172
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173 =pod
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174
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175 =head1 NAME
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176
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177 C<IMPL::Class::Meta> - информация хранимая на уровне класса.
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178
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179 =head1 SYNOPSIS
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180
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181 =begin code
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182
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183 package InfoMeta;
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184
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185 use parent qw(IMPL::Object IMPL::Object::Autofill);
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186 use IMPL::Class::Property;
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187
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188 __PACKAGE__->PassThroughArgs;
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189
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190 BEGIN {
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191 public property name => prop_get | owner_set;
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192 }
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193
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194 package InfoExMeta;
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195 use parent qw(InfoMeta);
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196
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197 __PACKAGE__->PassThroughArgs;
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198
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199 BEGIN {
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200 public property description => prop_all;
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201 }
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202
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203 package Foo;
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204
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205 __PACKAGE__->set_meta(new InfoMeta(name => 'info'));
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206 __PACKAGE__->set_meta(new InfoExMeta(name => 'infoEx', description => 'extended info' ));
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207
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208 package main;
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209
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210 # get all InfoMeta, InfoExMeta will be included, becouse it's derived from InfoMeta
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211 my @info = Foo->get_meta('InfoMeta'); # will get two objects, 'info' and 'infoEx';
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212
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213 # get all InfoExMeta meta
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214 @info = Foo->get_meta('InfoExMeta'); # will get only 'infoEx'
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215
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216 # get filtered meta
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217 @info = Foo->get_meta('InfoMeta', sub { $_->name eq 'info'} ); # will get only 'info'
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218
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219 =end code
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220
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221 =head1 DESCRIPTION
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222
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223 Позвоялет расширять информацию о типах (класса) при помощи метаданных, метаданными являются любые объекты,
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224 притом выборка метаданных приоизводится по их типу (классу), что позволяет выбрать все однотипные метаданные.
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225
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226 Существует возможность выборки метаданных с учетом унаследованных от базовых классов
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227
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228 =head1 MEMBERS
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229
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230 =head2 C<set_meta($meta_data)>
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231
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232 Добавляет метаданные C<$meta_data> к классу.
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233
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234 =head2 C<get_meta($meta_class,$predicate,$deep)>
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235
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236 Выбирает метаданные типа C<$meta_class> и его наследников, с возможностью фильтрации и получения
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237 метаданных базовых классов.
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238
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239 =over
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240
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241 =item C<$meta_class>
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242
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243 Тип метаданных
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244
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245 =item C<$predicate>
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246
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247 Подпрограмма, которая будет вызываться для каждых найденных метаданных и на основе результата
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248 ее выполнения метаданные будут включены в результат или нет. Получеат в качестве параметра
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249 объект с метаданными, возвращает C<true> - включить метаданные в результа, C<false> - пропустить
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250 метаданные как не подходящие. Также переменная C<$_> ссылается на текущий объект с метаданными.
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251
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252 =begin code
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253
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254 my @info = Foo->get_meta(
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255 'InfoMeta',
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256 sub { ref $_ eq 'InfoMeta'}, # exclude subclasses ('InfoExMeta')
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257 1 # deep search
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258 );
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259
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260 my @info = Foo->get_meta(
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261 'InfoMeta',
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262 sub {
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263 my $item = shift;
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264 ref $item eq 'InfoMeta' # exclude subclasses ('InfoExMeta')
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265 },
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266 1 # deep search
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267 );
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268
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269 =end code
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270
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271 =item C<$deep>
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272
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273 Осуществлять поиск по базовым классам.
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274
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275 =back
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276
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277 =head2 C<static_accessor($name[,$value[,$inherit]])>
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278
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279 Создает статическое свойство с именем C<$name> и начальным значением C<$value>.
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280
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281 Параметр C<$inherit> контролирует то, как наследуются значения.
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282
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283 =over
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284
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285 =item * C<inherit>
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286
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287 По умолчанию. Означает, что если для класса не определено значение, оно будет
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288 получено от родителя.
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289
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290 =item * C<clone>
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291
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292 Если для класса не определено значение, то оно будет клонировано из
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293 родительского значения при первом обращении. Полезно, когда родитель задает
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294 значение по-умолчанию, которое разделяется между несколькими потомками,
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295 которые модифицирю само значение (например значением является ссылка на хеш,
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296 а потомки добавляют или меняют значения в этом хеше).
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297
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298 =item * C<own>
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299
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300 Каждый класс имеет свое собственное значение не зависящее от того, что было
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301 у предка. Начальное значение для этого статического свойства C<undef>.
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302
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303 =back
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304
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305 Данный метод является заглушкой, он передает управление
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306 C<static_accessor_inherit>, C<static_accessor_clone>, C<static_accessor_own>
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307 соответственно. Эти методы можно вызывать явно
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308 C<static_accessor_*($name[,$value])>.
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309
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310
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311 =begin code
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312
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313 package Foo;
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314 use parent qw(IMPL::Class::Meta);
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315
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316 __PACKAGE__->static_accessor( info => { version => 1 } );
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317 __PACKAGE__->static_accessor( mappings => { toString => \&ToString }, 'clone' );
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318 __PACKAGE__->static_accessor( _instance => undef, 'own' );
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319
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320 sub ToString {
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321 "[object Foo]";
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322 }
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323
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324 sub default {
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325 my ($self) = @_;
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326
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327 $self = ref $self || $self;
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328 return $self->_instance ? $self->_instance : $self->_instance($self->new());
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329 }
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330
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331 package Bar;
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332 use parent qw(Foo);
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333
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334 __PACKAGE__->info({language => 'English', version => 2}); # will define own 'info' but will loose original data.
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335 __PACKAGE__->mappings->{sayHello} = \&SayHello; # will not affect Foo->mappings;
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336
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337 package main;
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338
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339 my $foo = Foo->default; # will be a Foo object
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340 my $bar = Bar->default; # will be a Bar object
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341
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342 =end code
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343
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344 =cut