Mercurial > pub > Impl

annotate Lib/IMPL/Class/Property/Base.pm @ 96:4c55aed00ff2

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Minor changes
author wizard
date Fri, 30 Apr 2010 15:03:38 +0400
parents f017c0d7527c
children a07a66fd8d5c
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1 package IMPL::Class::Property::Base;
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2 use strict;
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3
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4 use IMPL::Class::Property;
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5
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6 require IMPL::Class::Member;
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7
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8 sub factoryParams { qw($class $name $set $get $validator) };
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9
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10 my %factoryCache;
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11
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12 my $accessor_get_no = 'die new IMPL::Exception(\'The property is write only\',$name,$class) unless $get;';
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13 my $accessor_set_no = 'die new IMPL::Exception(\'The property is read only\',$name,$class) unless $set;';
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14
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15 my $custom_accessor_get = 'unshift @_, $this and goto &$get;';
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16 my $custom_accessor_set = 'unshift @_, $this and goto &$set;';
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17
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18 my $validator_code = '$this->$validator(@_);';
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19
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20 my %access_code = (
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21 IMPL::Class::Member::MOD_PUBLIC , "",
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22 IMPL::Class::Member::MOD_PROTECTED, "die new IMPL::Exception('Can\\'t access the protected member',\$name,\$class,scalar caller) unless UNIVERSAL::isa(scalar caller,\$class);",
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23 IMPL::Class::Member::MOD_PRIVATE, "die new IMPL::Exception('Can\\'t access the private member',\$name,\$class,scalar caller) unless caller eq \$class;"
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24 );
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25
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26 my $virtual_call = q(
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27 my $method = $this->can($name);
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28 return $this->$method(@_) unless $method == $accessor or caller->isa($class);
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29 );
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30
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31 my $owner_check = "die new IMPL::Exception('Set accessor is restricted to the owner',\$name,\$class,scalar caller) unless caller eq \$class;";
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32
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33 sub GenerateAccessors {
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34 my ($self,$param,@params) = @_;
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35
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36 my %accessors;
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37
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38 if (not ref $param) {
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39 if ($param & prop_list) {
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40 $accessors{get} = ($param & prop_get) ? $self->GenerateGetList(@params) : $accessor_get_no;
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41 $accessors{set} = ($param & prop_set) ? $self->GenerateSetList(@params) : $accessor_set_no;
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42 } else {
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43 $accessors{get} = ($param & prop_get) ? $self->GenerateGet(@params) : $accessor_get_no;
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44 $accessors{set} = ($param & prop_set) ? $self->GenerateSet(@params) : $accessor_set_no;
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45 }
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46 $accessors{owner} = (($param & owner_set) == owner_set) ? $owner_check : "";
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47 } elsif (UNIVERSAL::isa($param,'HASH')) {
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48 $accessors{get} = $param->{get} ? $custom_accessor_get : $accessor_get_no;
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49 $accessors{set} = $param->{set} ? $custom_accessor_set : $accessor_set_no;
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50 $accessors{owner} = "";
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51 } else {
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52 die new IMPL::Exception('The unsupported accessor/mutators supplied',$param);
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53 }
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54
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55 return \%accessors;
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56 }
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57
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58 sub GenerateSet {
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59 die new IMPL::Exception("Standard accessors not supported",'Set');
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60 }
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61
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62 sub GenerateGet {
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63 die new IMPL::Exception("Standard accessors not supported",'Get');
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64 }
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65
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66 sub GenerateGetList {
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67 die new IMPL::Exception("Standard accessors not supported",'GetList');
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68 }
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69
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70 sub GenerateSetList {
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71 my ($self) = @_;
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72 die new IMPL::Exception("Standard accessors not supported",'SetList');
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73 }
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74
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75 sub Make {
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76 my ($self,$propInfo) = @_;
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77
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78 my $key = $self->MakeFactoryKey($propInfo);
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79
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80 my $factory = $factoryCache{$key};
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81
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82 unless ($factory) {
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83 my $mutators = $self->GenerateAccessors($propInfo->Mutators);
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84 $factory = $self->CreateFactory(
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85 $access_code{ $propInfo->Access },
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86 $propInfo->Attributes->{validator} ? $validator_code : "",
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87 $mutators->{owner},
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88 $mutators->{get},
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89 $mutators->{set}
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90 );
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91 $factoryCache{$key} = $factory;
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92 }
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93
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94 {
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95 no strict 'refs';
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96 *{ $propInfo->Class.'::'.$propInfo->Name } = &$factory($self->RemapFactoryParams($propInfo));
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97 }
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98
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99 my $mutators = $propInfo->Mutators;
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100
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101 if (ref $mutators) {
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102 $propInfo->canGet( $mutators->{get} ? 1 : 0 );
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103 $propInfo->canSet( $mutators->{set} ? 1 : 0 );
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104 $propInfo->ownerSet(0);
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105 } else {
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106 $propInfo->canGet( $mutators & prop_get );
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107 $propInfo->canSet( $mutators & prop_set );
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108 $propInfo->ownerSet( ($mutators & owner_set) == owner_set );
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109 }
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110 }
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111
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112 # extract from property info: class, name, get_accessor, set_accessor, validator
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113 sub RemapFactoryParams {
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114 my ($self,$propInfo) = @_;
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115
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116 my $mutators = $propInfo->Mutators;
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117 my $class = $propInfo->Class;
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118 my $validator = $propInfo->Attributes->{validator};
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119
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120 die new IMPL::Exception('Can\'t find the specified validator',$class,$validator) if $validator and ref $validator ne 'CODE' and not $class->can($validator);
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121
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122 return (
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123 $propInfo->get(qw(Class Name)),
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124 (ref $mutators?
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125 ($mutators->{set},$mutators->{get})
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126 :
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127 (undef,undef)
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128 ),
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129 $validator
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130 );
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131 }
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132
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133 sub MakeFactoryKey {
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134 my ($self,$propInfo) = @_;
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135
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136 my ($access,$mutators,$validator) = ($propInfo->get(qw(Access Mutators)),$propInfo->Attributes->{validator});
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137
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138 my $implementor = ref $self || $self;
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139
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140 return join ('',
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141 $implementor,
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142 $access,
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143 $validator ? 'v' : 'n',
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144 ref $mutators ?
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145 ('c' , $mutators->{get} ? 1 : 0, $mutators->{set} ? 1 : 0)
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146 :
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147 (($mutators & prop_list) ? 'l' : 's' , ($mutators & prop_get) ? 1 : 0, ($mutators & prop_set) ? ((($mutators & owner_set) == owner_set) ? 2 : 1 ) : 0 )
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148 );
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149 }
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150
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151 sub CreateFactory {
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152 my ($self,$codeAccessCheck,$codeValidator,$codeOwnerCheck,$codeGet,$codeSet) = @_;
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153
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154 my $strParams = join(',',$self->factoryParams);
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155
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156 my $factory = <<FACTORY;
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157
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158 sub {
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159 my ($strParams) = \@_;
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160 my \$accessor;
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161 \$accessor = sub {
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162 my \$this = shift;
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163 $codeAccessCheck
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164 if (\@_) {
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165 $codeOwnerCheck
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166 $codeValidator
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167 $codeSet
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168 } else {
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169 $codeGet
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170 }
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171 }
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172 }
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173 FACTORY
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174
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175 return ( eval $factory or die new IMPL::Exception("Syntax error due compiling the factory","$@") );
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176 }
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177
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178 1;
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179
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180 __END__
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181
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182 =pod
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183
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184 =head1 DESCRIPTION
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185
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186 Базовый класс для реализации свойств.
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187
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188 По существу свойства состоят из двух методов для установки и получения значений. Также
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189 существует несколько вариантов доступа к свойству, и метод верификации значения. Еще
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190 свойства могут быть виртуальными.
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191
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192 Для создания реализатора свойств достаточно унаследовать от этого класса и описать
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193 методы для генерации кода получения и установки значения.
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194
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195 =head1 MEMBERS
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196
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197 =over
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198
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199 =item C<Make($propertyInfo)>
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200
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201 Создает свойство у класса, на основе C<$propertyInfo>, описывающего свойство. C<IMPL::Class::PropertyInfo>.
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202
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203 =back
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204
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205 =cut