annotate Lib/IMPL/Class/Meta.pm @ 182:adc7669172c4

sync
author sergey
date Mon, 26 Mar 2012 02:01:05 +0400
parents d1676be8afcc
children 4d0e1962161c
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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 IMPL::clone qw(clone);
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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}{$name} = clone($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 static_accessor {
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61 my ($class,$name,$value) = @_;
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62 $class = ref $class || $class;
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63
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64 no strict 'refs';
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65
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66 *{"${class}::${name}"} = sub {
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67 if (@_ > 1) {
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68 my $self = shift;
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69 $self = ref $self || $self;
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70
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71 if ($class ne $self) {
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72 $self->static_accessor( $name => $_[0]); # define own class data
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73 } else {
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74 $value = $_[0];
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75 }
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76 } else {
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77 $value;
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78 }
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79 };
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80 $value
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81 };
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82
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83 sub _find_class_data {
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84 my ($class,$name) = @_;
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85
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86 no strict 'refs';
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87
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88 exists $class_data{$_}{$name} and return $class_data{$_}{$name} foreach @{"${class}::ISA"};
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89
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90 my $val;
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91 $val = $_->can('_find_class_data') ? $_->_find_class_data($name) : undef and return $val foreach @{"${class}::ISA"};
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92 }
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93
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94 1;
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95
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96 __END__
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97
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98 =pod
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99
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100 =head1 NAME
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101
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102 C<IMPL::Class::Meta> - информация хранимая на уровне класса.
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103
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104 =head1 SYNOPSIS
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105
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106 =begin code
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107
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108 package InfoMeta;
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109
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110 use parent qw(IMPL::Object IMPL::Object::Autofill);
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111 use IMPL::Class::Property;
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112
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113 __PACKAGE__->PassThroughArgs;
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114
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115 BEGIN {
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116 public property name => prop_get | owner_set;
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117 }
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118
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119 package InfoExMeta;
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120 use parent qw(InfoMeta);
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121
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122 __PACKAGE__->PassThroughArgs;
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123
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124 BEGIN {
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125 public property description => prop_all;
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126 }
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127
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128 package Foo;
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129
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130 __PACKAGE__->set_meta(new InfoMeta(name => 'info'));
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131 __PACKAGE__->set_meta(new InfoExMeta(name => 'infoEx', description => 'extended info' ));
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132
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133 package main;
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134
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135 # get all InfoMeta, InfoExMeta will be included, becouse it's derived from InfoMeta
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136 my @info = Foo->get_meta('InfoMeta'); # will get two objects, 'info' and 'infoEx';
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137
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138 # get all InfoExMeta meta
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139 @info = Foo->get_meta('InfoExMeta'); # will get only 'infoEx'
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140
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141 # get filtered meta
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142 @info = Foo->get_meta('InfoMeta', sub { $_->name eq 'info'} ); # will get only 'info'
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143
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144 =end code
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145
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146 =head1 DESCRIPTION
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147
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148 Позвоялет расширять информацию о типах (класса) при помощи метаданных, метаданными являются любые объекты,
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149 притом выборка метаданных приоизводится по их типу (классу), что позволяет выбрать все однотипные метаданные.
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150
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151 Существует возможность выборки метаданных с учетом унаследованных от базовых классов
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152
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153 =head1 MEMBERS
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154
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155 =over
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156
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157 =item C<set_meta($meta_data)>
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158
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159 Добавляет метаданные C<$meta_data> к классу.
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160
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161 =item C<get_meta($meta_class,$predicate,$deep)>
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162
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163 Выбирает метаданные типа C<$meta_class> и его наследников, с возможностью фильтрации и получения
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164 метаданных базовых классов.
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165
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166 =over
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167
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168 =item C<$meta_class>
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169
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170 Тип метаданных
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171
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172 =item C<$predicate>
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173
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174 Подпрограмма, которая будет вызываться для каждых найденных метаданных и на основе результата
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175 ее выполнения метаданные будут включены в результат или нет. Получеат в качестве параметра
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176 объект с метаданными, возвращает C<true> - включить метаданные в результа, C<false> - пропустить
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177 метаданные как не подходящие. Также переменная C<$_> ссылается на текущий объект с метаданными.
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178
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179 =begin code
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180
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181 my @info = Foo->get_meta(
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182 'InfoMeta',
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183 sub { ref $_ eq 'InfoMeta'}, # exclude subclasses ('InfoExMeta')
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184 1 # deep search
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185 );
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186
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187 my @info = Foo->get_meta(
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188 'InfoMeta',
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189 sub {
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190 my $item = shift;
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191 ref $item eq 'InfoMeta' # exclude subclasses ('InfoExMeta')
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192 },
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193 1 # deep search
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194 );
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195
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196 =end code
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197
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198 =item C<$deep>
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199
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200 Осуществлять поиск по базовым классам.
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201
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202 =back
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203
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204 =item C<class_data($name,$new_value)>
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205
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206 В отличии от метаданных, C<class_data> не накапливает информацию,
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207 а хранит только один экземпляр для одного ключа C<$name>.
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208
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209 Если новое значение не задано, то осуществляется выборка сохраненного,
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210 если текущий класс не имеет сохраненного значения, то оно ищется в базовых
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211 классах, затем копия найденного значения сохраняется в текущем классе и
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212 возвращается наружу. Это позволяет базовым классам задавать значение по-умолчанию,
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213 которые могут быть изменены или заменены субклассами.
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214
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215 =begin code
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216
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217 package Foo;
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218 use parent qw(IMPL::Class::Meta);
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219
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220 __PACKAGE__->class_data( info => { version => 1 } ); # will be default for all subclasses
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221
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222 sub say_version {
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223 my ($self) = @_;
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224
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225 print $self->class_data('info')->{version};
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226 }
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227
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228 package Bar;
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229 use parent qw(Foo);
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230
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231 __PACKAGE__->class_data('info')->{ language } = 'English';
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232
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233 package main;
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234
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235 Foo->class_data('info')->{version} = 2;
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236 Bar->say_version; # will print '1';
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237 Foo->say_version; # will print '2';
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238
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239 =end code
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240
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241 =item C<static_accessor($name[,$value])>
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242
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243 Создает статическое свойство с именем C<$name> и начальным значением C<$value>.
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244
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245 Использование данного свойство аналогично использованию C<class_data>, за исключением
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246 того, что C<class_data> гарантирует, что наследник обладает собственной копией данных,
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247 изменение которых не коснется ни базового класса, ни соседей.
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248
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249 =begin code
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250
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251 package Foo;
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252 use parent qw(IMPL::Class::Meta);
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253
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254 __PACKAGE__->static_accessor( info => { version => 1 } );
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255
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256 package Bar;
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257 use parent qw(Foo);
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258
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259 __PACKAGE__->info->{language} = 'English'; # Foo->info->{language} will become 'English' to!!!
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260 __PACKAGE__->info({language => 'English'}); # will define own 'info' but will loose original data.
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261
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262 =end code
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263
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264
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265 =back
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266
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267 =cut