annotate lib/IMPL/Object/Factory.pm @ 416:cc2cf8c0edc2 ref20150831

sync
author cin
date Thu, 29 Oct 2015 03:50:25 +0300
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children
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407
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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 IMPL::Const qw(:prop);
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5
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6 use IMPL::declare {
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7 base => [
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8 'IMPL::Object' => undef,
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9 'IMPL::Object::Serializable' => undef
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10 ],
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11 props => [
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12 factory => PROP_RO,
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13 parameters => PROP_RO,
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14 method => PROP_RO
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15 ]
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16 };
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17
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18 # custom factory, overrides default
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19 sub new {
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20 my $self = shift;
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21
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22 return ref $self ? $self->CreateObject(@_) : $self->IMPL::Object::new(@_);
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23 }
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24
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25 sub CTOR {
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26 my ($this,$factory,$parameters,$method) = @_;
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27
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28 $this->factory($factory) or die new IMPL::InvalidArgumentException("The argument 'factory' is mandatory");
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29 $this->parameters($parameters) if $parameters;
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30 $this->method($method) if $method;
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31 }
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32
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33 # override default restore method
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34 sub restore {
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35 my ($class,$data,$surrogate) = @_;
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36
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37 my %args = @$data;
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38
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39 if ($surrogate) {
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40 $surrogate->self::CTOR($args{factory},$args{parameters},$args{method});
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41 return $surrogate;
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42 } else {
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43 return $class->new($args{factory},$args{parameters},$args{method});
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44 }
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45 }
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46
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47 sub CreateObject {
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48 my $this = shift;
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49
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50 if (my $method = $this->method) {
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51 $this->factory->$method($this->MergeParameters(@_));
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52 } else {
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53 $this->factory->new($this->MergeParameters(@_));
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54 }
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55 }
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56
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57 sub MergeParameters {
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58 my $this = shift;
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59
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60 $this->parameters ? (_as_list($this->parameters),@_) : @_;
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61 }
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62
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63
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64 sub _as_list {
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65 ref $_[0] ?
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66 (ref $_[0] eq 'HASH' ?
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67 %{$_[0]}
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68 :
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69 (ref $_[0] eq 'ARRAY'?
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70 @{$_[0]}
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71 :
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72 $_[0]
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73 )
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74 )
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75 :
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76 ($_[0]);
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77 }
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78
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79
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80 1;
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81
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82 __END__
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83
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84 =pod
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85
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86 =head1 SYNOPSIS
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87
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88 =begin code
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89
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90 my $factory = new IMPL::Object::Factory(
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91 'MyApp::User',
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92 {
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93 isAdmin => 1
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94 }
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95 );
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96
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97 my $class = 'MyApp::User';
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98
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99 my $user;
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100
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101 $user = $class->new(name => 'nobody'); # will create object MyApp::User
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102 # and pass parameters (name=>'nobody')
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103
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104 $user = $factory->new(name => 'root'); # will create object MyApp::User
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105 # and pass paremeters (isAdmin => 1, name => 'root')
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106
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107 =end code
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108
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109 Или сериализованная форма в XML.
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110
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111 =begin code xml
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112
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113 <factory type="IMPL::Object::Factory">
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114 <factory>MyApp::User</factory>,
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115 <parameters type="HASH">
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116 <isAdmin>1</isAdmin>
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117 </parameters>
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118 </factory>
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119
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120 =end code xml
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121
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122 =head1 DESCRIPTION
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123
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124 C<[Serializable]>
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125
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126 Класс, реализующий фабрику классов.
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127
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128 Фабрика классов это любой объект, который имеет метод C< new > вызов которого приводит к созданию нового
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129 объекта. Например каждый класс сам явялется фабрикой, поскольку, если у него вызвать метод
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130 C< new >, то будет создан объект. Полученные объекты, в силу механизмов языка Perl, также
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131 являются фабриками, притом такимиже, что и класс.
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132
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133 Данный класс меняет поведение метода C< new > в зависимости от контекста вызова: статического
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134 метода или метода объекта. При вызове метода C< new > у класса происходит создание объекта
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135 фабрики с определенными параметрами. Далее объект-фабрика может быть использована для создания
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136 объектов уже на основе параметров фабрики.
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137
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138 =head1 MEMBERS
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139
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140 =over
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141
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142 =item C< CTOR($factory,$parameters,$method) >
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143
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144 Создает новый экземпляр фабрики.
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145
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146 =over
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147
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148 =item C<$factory>
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149
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150 Либо имя класса, либо другая фабрика.
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151
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152 =item C<$parameters>
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153
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154 Ссылка на параметры для создания объектов, может быть ссылкой на хеш, массив и т.д.
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155
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156 Если является ссылкой на хеш, то при создании объектов данной фабрикой этот хеш
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157 будет развернут в список и передан параметрами методу C<new>.
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158
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159 Если является ссылкой на массив, то при создании объектов данной фабрикой этот массив
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160 будет передан в списк и передан параметрами методу C<new>.
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161
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162 Если является любым другим объектом или скаляром, то будет передан параметром методу
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163 C<new> как есть.
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164
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165 =item C<$method>
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166
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167 Имя метода (или ссылка на процедуру), который будет вызван у C<$factory> при создании
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168 текущей фабрикой нового объекта.
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169
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170 =back
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171
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172 =item C< [get] factory >
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173
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174 Свойство, содержащее фабрику для создание новых объектов текущей фабрикой. Чаще всего оно содержит
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175 имя класса.
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176
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177 =item C< [get] parameters >
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178
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179 Свойство, содержит ссылку на параметры для создания объектов, при создании объекта эти параметры будут
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180 развернуты в список и переданы оператору C< new > фабрике из свойства C< factory >, за ними будут
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181 следовать параметры непосредственно текущей фабрики.
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182
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183 =item C<MergeParameters(@params)>
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184
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185 Метод смешивающий фиксированные параметры с параметрами переданными методу C<new(@params)>. По умолчанию
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186 добавляет пареметры фабрики в конец к фиксированным параметрам. Для изменения этого поведения требуется
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187 переопределить данный метод. Также этот метод можно переопределить для передачи параметров, значения
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188 которых вычисляются.
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189
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190 =item C<new(@params)>
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191
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192 Создает новый объект, используя свйство C<factory> как фабрику и передавая туда параметры
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193 из свойства C<parameters> и списка C<@params>. Ниже приведен упрощенный пример, как это происходит.
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194
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195 =begin code
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196
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197 sub new {
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198 my ($this,@params) = @_;
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199
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200 my $method = $this->method || 'new';
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201
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202 return $this->factory->$method(_as_list($this->parameters), @params);
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203 }
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204
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205 =end code
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206
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207 =back
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208
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209 =cut