annotate Lib/IMPL/Class/Meta.pm @ 131:3df87ee58bee

Added IMPL::IOException
author wizard
date Wed, 16 Jun 2010 17:49:12 +0400
parents 6c25ea91c985
children 44977efed303
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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 Class::Data::Inheritable;
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5 use Storable qw(dclone);
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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 set_meta {
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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 get_meta {
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22 my ($class,$meta_class,$predicate,$deep) = @_;
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23 $class = ref $class if ref $class;
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24 no strict 'refs';
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25 my @result;
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26
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27 if ($deep) {
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28 @result = map { $_->can('get_meta') ? $_->get_meta($meta_class,$predicate,$deep) : () } @{$class.'::ISA'};
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29 }
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30
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31 if ($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 wantarray ? @result : \@result;
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37 }
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38
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39 sub class_data {
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40 my $class = shift;
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41 $class = ref $class || $class;
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42
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43 if (@_ > 1) {
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44 my ($name,$value) = @_;
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45 return $class_data{$class}{$name} = $value;
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46 } else {
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47 my ($name) = @_;
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48
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49 if( exists $class_data{$class}{$name} ) {
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50 $class_data{$class}{$name};
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51 } else {
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52 if ( my $value = $class->_find_class_data($name) ) {
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53 $class_data{$class}{$name} = dclone($value);
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54 } else {
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55 undef;
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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
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61 sub _find_class_data {
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62 my ($class,$name) = @_;
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63
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64 no strict 'refs';
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65
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66 exists $class_data{$_}{$name} and return $class_data{$_}{$name} foreach @{"${class}::ISA"};
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67
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68 my $val;
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69 $val = $_->_find_class_data($name) and return $val foreach @{"${class}::ISA"};
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70 }
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71
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72 1;
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73
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74 __END__
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75
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76 =pod
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77
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78 =head1 NAME
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79
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80 C<IMPL::Class::Meta> - информация хранимая на уровне класса.
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81
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82 =head1 SYNOPSIS
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83
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84 =begin code
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85
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86 package InfoMeta;
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87
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88 use base qw(IMPL::Object IMPL::Object::Autofill);
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89 use IMPL::Class::Property;
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90
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91 __PACKAGE__->PassThroughArgs;
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92
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93 BEGIN {
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94 public property name => prop_get | owner_set;
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95 }
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96
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97 package InfoExMeta;
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98 use base qw(InfoMeta);
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99
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100 __PACKAGE__->PassThroughArgs;
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101
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102 BEGIN {
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103 public property description => prop_all;
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104 }
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105
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106 package Foo;
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107
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108 __PACKAGE__->set_meta(new InfoMeta(name => 'info'));
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109 __PACKAGE__->set_meta(new InfoExMeta(name => 'infoEx', description => 'extended info' ));
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110
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111 package main;
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112
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113 # get all InfoMeta, InfoExMeta will be included, becouse it's derived from InfoMeta
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114 my @info = Foo->get_meta('InfoMeta'); # will get two objects, 'info' and 'infoEx';
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115
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116 # get all InfoExMeta meta
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117 @info = Foo->get_meta('InfoExMeta'); # will get only 'infoEx'
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118
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119 # get filtered meta
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120 @info = Foo->get_meta('InfoMeta', sub { $_->name eq 'info'} ); # will get only 'info'
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121
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122 =end code
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123
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124 =head1 DESCRIPTION
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125
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126 Позвоялет расширять информацию о типах (класса) при помощи метаданных, метаданными являются любые объекты,
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127 притом выборка метаданных приоизводится по их типу (классу), что позволяет выбрать все однотипные метаданные.
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128
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129 Существует возможность выборки метаданных с учетом унаследованных от базовых классов
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130
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131 =head1 MEMBERS
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132
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133 =over
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134
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135 =item C<set_meta($meta_data)>
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136
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137 Добавляет метаданные C<$meta_data> к классу.
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138
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139 =item C<get_meta($meta_class,$predicate,$deep)>
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140
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141 Выбирает метаданные типа C<$meta_class> и его наследников, с возможностью фильтрации и получения
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142 метаданных базовых классов.
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143
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144 =over
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145
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146 =item C<$meta_class>
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147
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148 Тип метаданных
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149
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150 =item C<$predicate>
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151
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152 Подпрограмма, которая будет вызываться для каждых найденных метаданных и на основе результата
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153 ее выполнения метаданные будут включены в результат или нет. Получеат в качестве параметра
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154 объект с метаданными, возвращает C<true> - включить метаданные в результа, C<false> - пропустить
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155 метаданные как не подходящие. Также переменная C<$_> ссылается на текущий объект с метаданными.
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156
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157 =begin code
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158
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159 my @info = Foo->get_meta(
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160 'InfoMeta',
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161 sub { ref $_ eq 'InfoMeta'}, # exclude subclasses ('InfoExMeta')
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162 1 # deep search
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163 );
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164
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165 my @info = Foo->get_meta(
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166 'InfoMeta',
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167 sub {
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168 my $item = shift;
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169 ref $item eq 'InfoMeta' # exclude subclasses ('InfoExMeta')
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170 },
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171 1 # deep search
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172 );
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173
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174 =end code
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175
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176 =item C<$deep>
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177
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178 Осуществлять поиск по базовым классам.
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179
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180 =back
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181
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182 =item C<class_data($name,$new_value)>
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183
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184 В отличии от метаданных, C<class_data> не накапливает информацию,
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185 а хранит только один экземпляр для одного ключа C<$name>.
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186
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187 Если новое значение не задано, то осуществляется выборка сохраненного,
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188 если текущий класс не имеет сохраненного значения, то оно ищется в базовых
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189 классах, затем копия найденного значения сохраняется в текущем классе и
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190 возвращается наружу. Это позволяет базовым классам задавать значение по-умолчанию,
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191 которые могут быть изменены или заменены субклассами.
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192
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193 =begin code
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194
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195 package Foo;
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196 use base qw(IMPL::Class::Meta);
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197
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198 __PACKAGE__->class_data( info => { version => 1 } ); # will be default for all subclasses
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199
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200 sub say_version {
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201 my ($self) = @_;
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202
111
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203 print $self->class_data('info')->{version};
90
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204 }
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205
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206 package Bar;
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207 use base qw(Foo);
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208
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209 __PACKAGE__->class_data('info')->{ language } = 'English';
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210
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211 package main;
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212
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213 Foo->class_data('info')->{version} = 2;
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214 Bar->say_version; # will print '1';
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215 Foo->say_version; # will print '2';
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216
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217 =end code
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218
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219 =back
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220
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221 =cut