annotate Lib/IMPL/Class/Meta.pm @ 139:5a9f64890c31

Fixed module loading by the UriController
author wizard
date Thu, 01 Jul 2010 17:32:29 +0400
parents 44977efed303
children 3765adf1803f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 Storable qw(dclone);
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5
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6 my %class_meta;
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7 my %class_data;
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8
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9 sub set_meta {
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10 my ($class,$meta_data) = @_;
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11 $class = ref $class if ref $class;
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12
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13 # тут нельзя использовать стандартное исключение, поскольку для него используется
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14 # класс IMPL::Object::Accessor, который наследуется от текущего класса
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15 die "The meta_data parameter should be an object" if not ref $meta_data;
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16
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17 push @{$class_meta{$class}{ref $meta_data}},$meta_data;
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18 }
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19
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20 sub get_meta {
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21 my ($class,$meta_class,$predicate,$deep) = @_;
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22 $class = ref $class if ref $class;
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23 no strict 'refs';
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24 my @result;
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25
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26 if ($deep) {
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27 @result = map { $_->can('get_meta') ? $_->get_meta($meta_class,$predicate,$deep) : () } @{$class.'::ISA'};
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28 }
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29
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30 if ($predicate) {
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31 push @result,grep( &$predicate($_), map( @{$class_meta{$class}{$_}}, grep( $_->isa($meta_class), keys %{$class_meta{$class} || {}} ) ) );
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32 } else {
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33 push @result, map( @{$class_meta{$class}{$_} || []}, grep( $_->isa($meta_class), keys %{$class_meta{$class} || {}} ) );
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34 }
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35 wantarray ? @result : \@result;
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36 }
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37
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38 sub class_data {
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39 my $class = shift;
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40 $class = ref $class || $class;
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41
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42 if (@_ > 1) {
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43 my ($name,$value) = @_;
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44 return $class_data{$class}{$name} = $value;
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45 } else {
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46 my ($name) = @_;
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47
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48 if( exists $class_data{$class}{$name} ) {
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49 $class_data{$class}{$name};
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50 } else {
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51 if ( my $value = $class->_find_class_data($name) ) {
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52 $class_data{$class}{$name} = dclone($value);
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53 } else {
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54 undef;
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55 }
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56 }
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57 }
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58 }
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59
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60 sub _find_class_data {
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61 my ($class,$name) = @_;
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62
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63 no strict 'refs';
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64
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65 exists $class_data{$_}{$name} and return $class_data{$_}{$name} foreach @{"${class}::ISA"};
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66
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67 my $val;
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68 $val = $_->_find_class_data($name) and return $val foreach @{"${class}::ISA"};
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69 }
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70
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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::Class::Meta> - информация хранимая на уровне класса.
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80
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81 =head1 SYNOPSIS
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82
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83 =begin code
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84
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85 package InfoMeta;
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86
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87 use base qw(IMPL::Object IMPL::Object::Autofill);
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88 use IMPL::Class::Property;
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89
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90 __PACKAGE__->PassThroughArgs;
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91
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92 BEGIN {
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93 public property name => prop_get | owner_set;
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94 }
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95
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96 package InfoExMeta;
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97 use base qw(InfoMeta);
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98
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99 __PACKAGE__->PassThroughArgs;
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100
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101 BEGIN {
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102 public property description => prop_all;
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103 }
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104
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105 package Foo;
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106
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107 __PACKAGE__->set_meta(new InfoMeta(name => 'info'));
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108 __PACKAGE__->set_meta(new InfoExMeta(name => 'infoEx', description => 'extended info' ));
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109
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110 package main;
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111
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112 # get all InfoMeta, InfoExMeta will be included, becouse it's derived from InfoMeta
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113 my @info = Foo->get_meta('InfoMeta'); # will get two objects, 'info' and 'infoEx';
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114
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115 # get all InfoExMeta meta
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116 @info = Foo->get_meta('InfoExMeta'); # will get only 'infoEx'
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117
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118 # get filtered meta
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119 @info = Foo->get_meta('InfoMeta', sub { $_->name eq 'info'} ); # will get only 'info'
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120
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121 =end code
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122
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123 =head1 DESCRIPTION
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124
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125 Позвоялет расширять информацию о типах (класса) при помощи метаданных, метаданными являются любые объекты,
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126 притом выборка метаданных приоизводится по их типу (классу), что позволяет выбрать все однотипные метаданные.
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127
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128 Существует возможность выборки метаданных с учетом унаследованных от базовых классов
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129
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130 =head1 MEMBERS
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131
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132 =over
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133
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134 =item C<set_meta($meta_data)>
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135
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136 Добавляет метаданные C<$meta_data> к классу.
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137
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138 =item C<get_meta($meta_class,$predicate,$deep)>
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139
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140 Выбирает метаданные типа C<$meta_class> и его наследников, с возможностью фильтрации и получения
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141 метаданных базовых классов.
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142
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143 =over
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144
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145 =item C<$meta_class>
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146
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147 Тип метаданных
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148
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149 =item C<$predicate>
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150
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151 Подпрограмма, которая будет вызываться для каждых найденных метаданных и на основе результата
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152 ее выполнения метаданные будут включены в результат или нет. Получеат в качестве параметра
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153 объект с метаданными, возвращает C<true> - включить метаданные в результа, C<false> - пропустить
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154 метаданные как не подходящие. Также переменная C<$_> ссылается на текущий объект с метаданными.
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155
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156 =begin code
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157
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158 my @info = Foo->get_meta(
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159 'InfoMeta',
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160 sub { ref $_ eq 'InfoMeta'}, # exclude subclasses ('InfoExMeta')
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161 1 # deep search
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162 );
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163
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164 my @info = Foo->get_meta(
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165 'InfoMeta',
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166 sub {
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167 my $item = shift;
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168 ref $item eq 'InfoMeta' # exclude subclasses ('InfoExMeta')
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169 },
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170 1 # deep search
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171 );
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172
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173 =end code
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174
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175 =item C<$deep>
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176
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177 Осуществлять поиск по базовым классам.
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178
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179 =back
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180
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181 =item C<class_data($name,$new_value)>
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182
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183 В отличии от метаданных, C<class_data> не накапливает информацию,
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184 а хранит только один экземпляр для одного ключа C<$name>.
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185
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186 Если новое значение не задано, то осуществляется выборка сохраненного,
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187 если текущий класс не имеет сохраненного значения, то оно ищется в базовых
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188 классах, затем копия найденного значения сохраняется в текущем классе и
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189 возвращается наружу. Это позволяет базовым классам задавать значение по-умолчанию,
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190 которые могут быть изменены или заменены субклассами.
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191
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192 =begin code
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193
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194 package Foo;
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195 use base qw(IMPL::Class::Meta);
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196
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197 __PACKAGE__->class_data( info => { version => 1 } ); # will be default for all subclasses
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198
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199 sub say_version {
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200 my ($self) = @_;
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201
111
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202 print $self->class_data('info')->{version};
90
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203 }
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204
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205 package Bar;
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206 use base qw(Foo);
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207
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208 __PACKAGE__->class_data('info')->{ language } = 'English';
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209
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210 package main;
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211
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212 Foo->class_data('info')->{version} = 2;
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213 Bar->say_version; # will print '1';
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214 Foo->say_version; # will print '2';
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215
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216 =end code
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217
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218 =back
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219
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220 =cut