annotate Lib/IMPL/Class/Meta.pm @ 219:c477f24f1980

sync
author sergey
date Tue, 21 Aug 2012 17:13:47 +0400
parents a8db61d0ed33
children 47f77e6409f7
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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,$value,$clone) = @_;
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73 $class = ref $class || $class;
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74
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75 no strict 'refs';
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76
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77 *{"${class}::${name}"} = sub {
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78 my $self = shift;
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79
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80 if (@_ > 0) {
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81 $self = ref $self || $self;
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82
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83 if ($class ne $self) {
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84 $self->static_accessor( $name => $_[0] ); # define own class data
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85 } else {
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86 $value = $_[0];
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87 }
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88 } else {
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89 ($clone and $class ne $self)
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90 ? $self->static_accessor($name => clone($value),$clone)
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91 : $value and $value ;
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92 }
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93 };
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94 $value
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95 };
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96
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97 sub _find_class_data {
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98 my ($class,$name) = @_;
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99
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100 no strict 'refs';
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101
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102 exists $class_data{$_}{$name} and return $class_data{$_}{$name} foreach @{"${class}::ISA"};
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103
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104 my $val;
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105 $val = $_->can('_find_class_data') ? $_->_find_class_data($name) : undef and return $val foreach @{"${class}::ISA"};
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106 }
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107
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108 1;
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109
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110 __END__
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111
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112 =pod
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113
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114 =head1 NAME
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115
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116 C<IMPL::Class::Meta> - информация хранимая на уровне класса.
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117
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118 =head1 SYNOPSIS
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119
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120 =begin code
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121
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122 package InfoMeta;
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123
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124 use parent qw(IMPL::Object IMPL::Object::Autofill);
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125 use IMPL::Class::Property;
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126
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127 __PACKAGE__->PassThroughArgs;
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128
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129 BEGIN {
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130 public property name => prop_get | owner_set;
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131 }
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132
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133 package InfoExMeta;
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134 use parent qw(InfoMeta);
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135
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136 __PACKAGE__->PassThroughArgs;
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137
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138 BEGIN {
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139 public property description => prop_all;
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140 }
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141
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142 package Foo;
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143
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144 __PACKAGE__->set_meta(new InfoMeta(name => 'info'));
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145 __PACKAGE__->set_meta(new InfoExMeta(name => 'infoEx', description => 'extended info' ));
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146
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147 package main;
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148
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149 # get all InfoMeta, InfoExMeta will be included, becouse it's derived from InfoMeta
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150 my @info = Foo->get_meta('InfoMeta'); # will get two objects, 'info' and 'infoEx';
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151
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152 # get all InfoExMeta meta
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153 @info = Foo->get_meta('InfoExMeta'); # will get only 'infoEx'
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154
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155 # get filtered meta
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156 @info = Foo->get_meta('InfoMeta', sub { $_->name eq 'info'} ); # will get only 'info'
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157
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158 =end code
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159
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160 =head1 DESCRIPTION
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161
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162 Позвоялет расширять информацию о типах (класса) при помощи метаданных, метаданными являются любые объекты,
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163 притом выборка метаданных приоизводится по их типу (классу), что позволяет выбрать все однотипные метаданные.
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164
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165 Существует возможность выборки метаданных с учетом унаследованных от базовых классов
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166
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167 =head1 MEMBERS
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168
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169 =head2 C<set_meta($meta_data)>
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170
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171 Добавляет метаданные C<$meta_data> к классу.
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172
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173 =head2 C<get_meta($meta_class,$predicate,$deep)>
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174
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175 Выбирает метаданные типа C<$meta_class> и его наследников, с возможностью фильтрации и получения
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176 метаданных базовых классов.
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177
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178 =over
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179
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180 =item C<$meta_class>
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181
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182 Тип метаданных
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183
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184 =item C<$predicate>
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185
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186 Подпрограмма, которая будет вызываться для каждых найденных метаданных и на основе результата
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187 ее выполнения метаданные будут включены в результат или нет. Получеат в качестве параметра
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188 объект с метаданными, возвращает C<true> - включить метаданные в результа, C<false> - пропустить
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189 метаданные как не подходящие. Также переменная C<$_> ссылается на текущий объект с метаданными.
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191 =begin code
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192
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193 my @info = Foo->get_meta(
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194 'InfoMeta',
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195 sub { ref $_ eq 'InfoMeta'}, # exclude subclasses ('InfoExMeta')
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196 1 # deep search
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197 );
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198
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199 my @info = Foo->get_meta(
194
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200 'InfoMeta',
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201 sub {
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202 my $item = shift;
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203 ref $item eq 'InfoMeta' # exclude subclasses ('InfoExMeta')
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204 },
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205 1 # deep search
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206 );
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207
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208 =end code
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209
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210 =item C<$deep>
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211
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212 Осуществлять поиск по базовым классам.
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213
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214 =back
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215
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216 =head2 C<static_accessor($name[,$value[,$clone]])>
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217
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218 Создает статическое свойство с именем C<$name> и начальным значением C<$value>.
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219
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220 Параметр C<$clone> контролирует то, как наследуются значения, если требуется каждому классу обеспечить
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221 свое уникальное значение, то при первом обращении оно будет клонировано, по умолчанию клонирование не
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222 происходит.
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223
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224 =begin code
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225
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226 package Foo;
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227 use parent qw(IMPL::Class::Meta);
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228
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229 __PACKAGE__->static_accessor( info => { version => 1 } );
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230
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231 package Bar;
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232 use parent qw(Foo);
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233
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234 __PACKAGE__->info->{language} = 'English'; # Foo->info->{language} will become 'English' to!!!
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235 __PACKAGE__->info({language => 'English'}); # will define own 'info' but will loose original data.
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236
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237 =end code
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238
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239 =cut