Mercurial > pub > Impl
annotate Lib/IMPL/Class/Property/Base.pm @ 260:2879cdb6b8cd
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author | sergey |
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date | Tue, 25 Dec 2012 02:18:59 +0400 |
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1 package IMPL::Class::Property::Base; |
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2 use strict; |
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3 |
230 | 4 use IMPL::Const qw(:all); |
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5 |
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6 sub factoryParams { qw($class $name $set $get $validator) }; |
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7 |
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8 my %factoryCache; |
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9 |
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10 my $accessor_get_no = 'die new IMPL::Exception(\'The property is write only\',$name,$class) unless $get;'; |
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11 my $accessor_set_no = 'die new IMPL::Exception(\'The property is read only\',$name,$class) unless $set;'; |
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12 |
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13 my $custom_accessor_get = 'unshift @_, $this and goto &$get;'; |
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14 my $custom_accessor_set = 'unshift @_, $this and goto &$set;'; |
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15 |
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16 my $validator_code = '$this->$validator(@_);'; |
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17 |
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18 my %access_code = ( |
230 | 19 ACCESS_PUBLIC , "", |
20 ACCESS_PROTECTED, "die new IMPL::Exception('Can\\'t access the protected member',\$name,\$class,scalar caller) unless UNIVERSAL::isa(scalar caller,\$class);", | |
21 ACCESS_PRIVATE, "die new IMPL::Exception('Can\\'t access the private member',\$name,\$class,scalar caller) unless caller eq \$class;" | |
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22 ); |
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23 |
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24 my $virtual_call = q( |
194 | 25 my $method = $this->can($name); |
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26 return $this->$method(@_) unless $method == $accessor or caller->isa($class); |
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27 ); |
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28 |
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29 my $owner_check = "die new IMPL::Exception('Set accessor is restricted to the owner',\$name,\$class,scalar caller) unless caller eq \$class;"; |
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30 |
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31 sub GenerateAccessors { |
194 | 32 my ($self,$param,@params) = @_; |
33 | |
34 my %accessors; | |
35 | |
36 if (not ref $param) { | |
230 | 37 if ($param & PROP_LIST) { |
38 $accessors{get} = ($param & PROP_GET) ? $self->GenerateGetList(@params) : undef; | |
39 $accessors{set} = ($param & PROP_SET) ? $self->GenerateSetList(@params) : undef; | |
194 | 40 } else { |
230 | 41 $accessors{get} = ($param & PROP_GET) ? $self->GenerateGet(@params) : undef; |
42 $accessors{set} = ($param & PROP_SET) ? $self->GenerateSet(@params) : undef; | |
194 | 43 } |
230 | 44 $accessors{owner} = (($param & PROP_OWNERSET) == PROP_OWNERSET) ? $owner_check : ""; |
194 | 45 } elsif (UNIVERSAL::isa($param,'HASH')) { |
46 $accessors{get} = $param->{get} ? $custom_accessor_get : undef; | |
47 $accessors{set} = $param->{set} ? $custom_accessor_set : undef; | |
48 $accessors{owner} = ""; | |
49 } else { | |
50 die new IMPL::Exception('The unsupported accessor/mutators supplied',$param); | |
51 } | |
52 | |
53 return \%accessors; | |
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54 } |
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55 |
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56 sub GenerateSet { |
194 | 57 die new IMPL::Exception("Standard accessors not supported",'Set'); |
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58 } |
194 | 59 |
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60 sub GenerateGet { |
194 | 61 die new IMPL::Exception("Standard accessors not supported",'Get'); |
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62 } |
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63 |
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64 sub GenerateGetList { |
194 | 65 die new IMPL::Exception("Standard accessors not supported",'GetList'); |
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66 } |
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67 |
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68 sub GenerateSetList { |
194 | 69 my ($self) = @_; |
70 die new IMPL::Exception("Standard accessors not supported",'SetList'); | |
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71 } |
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72 |
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73 sub Make { |
194 | 74 my ($self,$propInfo) = @_; |
75 | |
76 my $key = $self->MakeFactoryKey($propInfo); | |
77 | |
78 my $factoryInfo = $factoryCache{$key}; | |
79 | |
80 unless ($factoryInfo) { | |
81 my $mutators = $self->GenerateAccessors($propInfo->Mutators); | |
82 $factoryInfo = { | |
83 factory => $self->CreateFactory( | |
84 $access_code{ $propInfo->Access }, | |
85 $propInfo->Attributes->{validator} ? $validator_code : "", | |
86 $mutators->{owner}, | |
87 $mutators->{get} || $accessor_get_no, | |
88 $mutators->{set} || $accessor_set_no | |
89 ), | |
90 mutators => $mutators | |
91 }; | |
92 $factoryCache{$key} = $factoryInfo; | |
93 } | |
94 | |
95 { | |
96 no strict 'refs'; | |
97 *{ $propInfo->Class.'::'.$propInfo->Name } = $factoryInfo->{factory}->($self->RemapFactoryParams($propInfo)); | |
98 } | |
99 | |
100 my $mutators = $factoryInfo->{mutators}; | |
101 | |
102 $propInfo->canGet( $mutators->{get} ? 1 : 0 ); | |
103 $propInfo->canSet( $mutators->{set} ? 1 : 0 ); | |
104 $propInfo->ownerSet( $mutators->{owner} ); | |
105 | |
106 1; | |
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107 } |
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108 |
230 | 109 sub Implement { |
110 my ($self,$spec) = @_; | |
111 } | |
112 | |
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113 # extract from property info: class, name, get_accessor, set_accessor, validator |
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114 sub RemapFactoryParams { |
194 | 115 my ($self,$propInfo) = @_; |
116 | |
117 my $mutators = $propInfo->Mutators; | |
118 my $class = $propInfo->Class; | |
119 my $validator = $propInfo->Attributes->{validator}; | |
120 | |
121 die new IMPL::Exception('Can\'t find the specified validator',$class,$validator) if $validator and ref $validator ne 'CODE' and not $class->can($validator); | |
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122 |
194 | 123 return ( |
124 $propInfo->get(qw(Class Name)), | |
125 (ref $mutators? | |
126 ($mutators->{set},$mutators->{get}) | |
127 : | |
128 (undef,undef) | |
129 ), | |
130 $validator | |
131 ); | |
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132 } |
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133 |
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134 sub MakeFactoryKey { |
194 | 135 my ($self,$propInfo) = @_; |
136 | |
137 my ($access,$mutators,$validator) = ($propInfo->get(qw(Access Mutators)),$propInfo->Attributes->{validator}); | |
138 | |
139 my $implementor = ref $self || $self; | |
140 | |
141 return join ('', | |
142 $implementor, | |
143 $access, | |
144 $validator ? 'v' : 'n', | |
145 ref $mutators ? | |
146 ('c' , $mutators->{get} ? 1 : 0, $mutators->{set} ? 1 : 0) | |
147 : | |
148 ('s',$mutators) | |
149 ); | |
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150 } |
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151 |
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152 sub CreateFactory { |
194 | 153 my ($self,$codeAccessCheck,$codeValidator,$codeOwnerCheck,$codeGet,$codeSet) = @_; |
154 | |
155 my $strParams = join(',',$self->factoryParams); | |
156 | |
157 my $factory = <<FACTORY; | |
158 | |
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159 sub { |
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160 my ($strParams) = \@_; |
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161 my \$accessor; |
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162 \$accessor = sub { |
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163 my \$this = shift; |
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164 $codeAccessCheck |
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165 if (\@_) { |
194 | 166 $codeOwnerCheck |
167 $codeValidator | |
168 $codeSet | |
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169 } else { |
194 | 170 $codeGet |
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171 } |
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172 } |
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173 } |
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174 FACTORY |
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175 |
194 | 176 return ( eval $factory or die new IMPL::Exception("Syntax error due compiling the factory","$@") ); |
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177 } |
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178 |
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179 1; |
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180 |
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181 __END__ |
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182 |
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183 =pod |
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184 |
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185 =head1 DESCRIPTION |
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186 |
180 | 187 Базовый класс для реализации свойств. |
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188 |
180 | 189 По существу свойства состоят из двух методов для установки и получения значений. Также |
190 существует несколько вариантов доступа к свойству, и метод верификации значения. Еще | |
191 свойства могут быть виртуальными. | |
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192 |
180 | 193 Для создания реализатора свойств достаточно унаследовать от этого класса и описать |
194 методы для генерации кода получения и установки значения. | |
80 | 195 |
196 =head1 MEMBERS | |
197 | |
198 =over | |
199 | |
200 =item C<Make($propertyInfo)> | |
201 | |
180 | 202 Создает свойство у класса, на основе C<$propertyInfo>, описывающего свойство. C<IMPL::Class::PropertyInfo>. |
80 | 203 |
204 =back | |
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205 |
180 | 206 =cut |