annotate Lib/IMPL/Object/Factory.pm @ 96:4c55aed00ff2

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date Fri, 30 Apr 2010 15:03:38 +0400
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1 package IMPL::Object::Factory;
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2 use strict;
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3
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4 use base qw(IMPL::Object IMPL::Object::Serializable);
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5
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6 use IMPL::Class::Property;
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7
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8 BEGIN {
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9 public property factory => prop_get | owner_set;
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10 public property parameters => prop_get | owner_set;
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11 public property method => prop_get | owner_set;
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12 }
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13
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14 # custom factory, overrides default
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15 sub new {
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16 my $self = shift;
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17
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18 return ref $self ? $self->CreateObject(@_) : $self->SUPER::new(@_);
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19 }
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20
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21 sub CTOR {
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22 my ($this,$factory,$parameters,$method) = @_;
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23
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24 $this->factory($factory) or die new IMPL::InvalidArgumentException("The argument 'factory' is mandatory");
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25 $this->parameters($parameters) if $parameters;
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26 $this->method($method) if $method;
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27 }
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28
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29 # override default restore method
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30 sub restore {
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31 my ($class,$data,$surrogate) = @_;
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32
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33 my %args = @$data;
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34
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35 if ($surrogate) {
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36 $surrogate->callCTOR($args{factory},$args{parameters},$args{method});
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37 return $surrogate;
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38 } else {
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39 return $class->new($args{factory},$args{parameters},$args{method});
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40 }
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41 }
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42
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43 sub CreateObject {
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44 my $this = shift;
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45
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46 if (my $method = $this->method) {
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47 $this->factory->$method($this->parameters ? (_as_list($this->parameters),@_) : @_);
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48 } else {
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49 $this->factory->new($this->parameters ? (_as_list($this->parameters),@_) : @_);
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50 }
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51 }
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53 sub _as_list {
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54 ref $_[0] ?
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55 (ref $_[0] eq 'HASH' ?
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56 %{$_[0]}
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57 :
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58 (ref $_[0] eq 'ARRAY'?
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59 @{$_[0]}
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60 :
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61 $_[0]
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62 )
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63 )
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64 :
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65 ($_[0]);
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66 }
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69 1;
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70
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71 __END__
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72
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73 =pod
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74
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75 =head1 SYNOPSIS
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76
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77 =begin code
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78
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79 my $factory = new IMPL::Object::Factory(
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80 'MyApp::User',
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81 {
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82 isAdmin => 1
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83 }
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84 );
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85
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86 my $class = 'MyApp::User';
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87
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88 my $user;
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89
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90 $user = $class->new(name => 'nobody'); # will create object MyApp::User
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91 # and pass parameters (name=>'nobody')
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92
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93 $user = $factory->new(name => 'root'); # will create object MyApp::User
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94 # and pass paremeters (isAdmin => 1, name => 'root')
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95
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96 =end code
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97
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98 Или сериализованная форма в XML.
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99
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100 =begin code xml
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101
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102 <factory type="IMPL::Object::Factory">
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103 <factory>MyApp::User</factory>,
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104 <parameters type="HASH">
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105 <isAdmin>1</isAdmin>
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106 </parameters>
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107 </factory>
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108
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109 =end code xml
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110
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111 =head1 DESCRIPTION
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112
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113 C<[Serializable]>
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114
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115 Класс, реализующий фабрику классов.
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116
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117 Фабрика классов это любой объект, который имеет метод C< new > вызов которого приводит к созданию нового
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118 объекта. Например каждый класс сам явялется фабрикой, поскольку, если у него вызвать метод
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119 C< new >, то будет создан объект. Полученные объекты, в силу механизмов языка Perl, также
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120 являются фабриками, притом такимиже, что и класс.
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121
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122 Данный класс меняет поведение метода C< new > в зависимости от контекста вызова: статического
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123 метода или метода объекта. При вызове метода C< new > у класса происходит создание объекта
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124 фабрики с определенными параметрами. Далее объект-фабрика может быть использована для создания
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125 объектов уже на основе параметров фабрики.
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126
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127 =head1 MEMBERS
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128
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129 =over
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130
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131 =item C< CTOR($factory,$parameters,$method) >
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132
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133 Создает новый экземпляр фабрики.
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134
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135 =over
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136
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137 =item C<$factory>
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138
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139 Либо имя класса, либо другая фабрика.
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140
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141 =item C<$parameters>
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142
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143 Ссылка на параметры для создания объектов, может быть ссылкой на хеш, массив и т.д.
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144
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145 Если является ссылкой на хеш, то при создании объектов данной фабрикой этот хеш
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146 будет развернут в список и передан параметрами методу C<new>.
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147
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148 Если является ссылкой на массив, то при создании объектов данной фабрикой этот массив
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149 будет передан в списк и передан параметрами методу C<new>.
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150
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151 Если является любым другим объектом или скаляром, то будет передан параметром методу
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152 C<new> как есть.
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153
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154 =item C<$method>
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155
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156 Имя метода (или ссылка на процедуру), который будет вызван у C<$factory> при создании
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157 текущей фабрикой нового объекта.
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158
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159 =back
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160
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161 =item C< [get] factory >
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162
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163 Свойство, содержащее фабрику для создание новых объектов текущей фабрикой. Чаще всего оно содержит
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164 имя класса.
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165
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166 =item C< [get] parameters >
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167
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168 Свойство, содержит ссылку на параметры для создания объектов, при создании объекта эти параметры будут
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169 развернуты в список и переданы оператору C< new > фабрике из свойства C< factory >, за ними будут
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170 следовать параметры непосредственно текущей фабрики.
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171
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172 =item C<new(@params)>
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173
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174 Создает новый объект, используя свйство C<factory> как фабрику и передавая туда параметры
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175 из свойства C<parameters> и списка C<@params>. Ниже приведен упрощенный пример, как это происходит.
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176
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177 =begin code
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178
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179 sub new {
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180 my ($this,@params) = @_;
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181
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182 my $method = $this->method || 'new';
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183
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184 return $this->factory->$method(_as_list($this->parameters), @params);
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185 }
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186
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187 =end code
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188
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189 =back
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190
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191 =cut