annotate Lib/IMPL/Config.pm @ 337:f4e14f32cf54

fixed bugs with string and local $_ added support for localized labels
author cin
date Fri, 14 Jun 2013 15:37:34 +0400
parents 4ddb27ff4a0b
children 212cc86e470b
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1 package IMPL::Config;
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2 use strict;
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3 use warnings;
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4
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5 use IMPL::Const qw(:access);
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6 use IMPL::declare {
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7 base => [
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8 'IMPL::Object::Accessor' => undef,
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9 'IMPL::Object::Serializable' => undef,
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10 'IMPL::Object::Autofill' => '@_'
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11 ]
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12 };
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13
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14 use File::Spec();
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15
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16 use IMPL::Class::Member;
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17 use IMPL::Class::PropertyInfo;
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18 use IMPL::Exception;
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19
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20 use IMPL::Serialization;
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21 use IMPL::Serialization::XmlFormatter;
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22
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23 our $ConfigBase ||= '';
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24 our $AppBase;
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25
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26 sub LoadXMLFile {
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27 my ($self,$file) = @_;
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28
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29 my $class = ref $self || $self;
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30
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31 my $serializer = new IMPL::Serializer(
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32 formatter => new IMPL::Serialization::XmlFormatter(
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33 IdentOutput => 1,
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34 SkipWhitespace => 1
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35 )
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36 );
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37
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38 open my $hFile,'<',$file or die new IMPL::Exception("Failed to open file",$file,$!);
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39
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40 my $obj;
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41 eval {
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42 $obj = $serializer->Deserialize($hFile);
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43 };
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44
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45 if ($@) {
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46 my $e=$@;
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47 die new IMPL::Exception("Can't load the configuration file",$file,$e);
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48 }
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49 return $obj;
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50 }
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51
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52 sub SaveXMLFile {
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53 my ($this,$file) = @_;
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54
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55 my $serializer = new IMPL::Serializer(
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56 formatter => new IMPL::Serialization::XmlFormatter(
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57 IdentOutput => 1,
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58 SkipWhitespace => 1
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59 )
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60 );
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61
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62 open my $hFile,'>',$file or die new IMPL::Exception("Failed to open file",$file,$!);
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63
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64 $serializer->Serialize($hFile, $this);
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65 }
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66
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67 sub xml {
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68 my $this = shift;
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69 my $serializer = new IMPL::Serializer(
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70 formatter => new IMPL::Serialization::XmlFormatter(
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71 IdentOutput => 1,
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72 SkipWhitespace => 1
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73 )
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74 );
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75 my $str = '';
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76 open my $hFile,'>',\$str or die new IMPL::Exception("Failed to open stream",$!);
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77
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78 $serializer->Serialize($hFile, $this);
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79
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80 undef $hFile;
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81
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82 return $str;
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83 }
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84
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85 sub save {
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86 my ($this,$ctx) = @_;
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87
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88 my $val;
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89
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90 $val = $this->rawGet($_) and $ctx->AddVar($_ => $val) foreach map $_->Name, $this->get_meta(
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91 'IMPL::Class::PropertyInfo',
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92 sub {
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93 $_->access == ACCESS_PUBLIC and
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94 $_->setter;
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95 },
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96 1);
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97 }
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98
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99 sub spawn {
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100 my ($this,$file) = @_;
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101 unless ($file) {
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102 ($file = ref $this || $this) =~ s/:+/./g;
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103 $file .= ".xml";
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104 }
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105 return $this->LoadXMLFile( File::Spec->catfile($ConfigBase,$file) );
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106 }
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107
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108 sub get {
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109 my $this = shift;
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110
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111 if (@_ == 1) {
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112 my $obj = $this->SUPER::get(@_);
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113 return UNIVERSAL::isa($obj,'IMPL::Config::Activator') ? $obj->activate : $obj;
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114 } else {
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115 my @objs = $this->SUPER::get(@_);
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116 return map UNIVERSAL::isa($_,'IMPL::Config::Activator') ? $_->activate : $_, @objs ;
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117 }
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118 }
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119
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120 sub rawGet {
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121 my $this = shift;
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122 return $this->SUPER::get(@_);
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123 }
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124
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125 sub Exists {
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126 $_[0]->SUPER::get($_[1]) ? 1 : 0;
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127 }
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128
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129 sub AppBase {
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130 shift;
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131 File::Spec->catdir($AppBase,@_);
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132 }
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133
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134 sub ConfigBase {
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135 shift;
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136 File::Spec->catdir($ConfigBase,@_);
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137 }
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138
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139 1;
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140 __END__
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141
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142 =pod
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143
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144 =head1 NAME
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145
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146 C<IMPL::Config> - базовый класс для настраиваемого приложения.
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147
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148 =head1 SYNOPSIS
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149
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150 =begin code
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151
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152 # define application
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153
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154 package MyApp;
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155 use parent qw(IMPL::Config);
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156
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157 use IMPL::Class::Property;
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158 use IMPL::Config::Class;
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159
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160 BEGIN {
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161 public property SimpleString => prop_all;
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162 public property DataSource => prop_all;
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163 }
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164
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165 sub CTOR {
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166 my $this = shift;
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167
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168 $this->DataSource(
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169 new IMPL::Config::Activator(
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170 factory => 'MyDataSource',
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171 parameters=>{
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172 host => 'localhost',
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173 user => 'dbuser'
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174 }
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175 )
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176 ) unless $this->Exists('DataSource');
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177 }
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178
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179 # using application object
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180
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181 my $app = spawn MyApp('default.xml');
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182
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183 $app->Run();
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184
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185 =end code
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186
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187 Ниже приведен пример файла C<default.xml> содержащего настройки приложения
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188
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189 =begin code xml
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190
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191 <app type='MyApp'>
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192 <SimpleString>The application</SimpleString>
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193 <DataSource type='IMPL::Config::Activator'>
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194 <factory>MyDataSourceClass</factory>
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195 <parameters type='HASH'>
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196 <host>localhost</host>
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197 <user>dbuser</user>
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198 </parameters>
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199 </DataSource>
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200 </app>
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201
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202 =end code xml
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203
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204 =head1 DESCRIPTION
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205
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206 C<[Serializable]>
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207
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208 C<[Autofill]>
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209
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210 C<use parent IMPL::Object::Accessor>
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211
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212 Базовый класс для приложений. Использует подход, что приложение
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213 является объектом, состояние которого предтавляет собой конфигурацию,
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214 а методы - логику.
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215
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216 Данный класс реализует функционал десериализации (и сериализации) экземпляра
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217 приложения из XML документа. Для этого используется механизм C<IMPL::Serialization>.
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218 При этом используются опции C<IMPL::Serialization::XmlFormatter> C<IdentOutput> и
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219 C<SkipWhitespace> для записи документа в легко читаемом виде.
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220
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221 Поскольку в результате восстановления приложения восстанавливаются все элементы
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222 из файла конфигурации, то это может потребовать значительных ресурсов для
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223 создания частей, которые могут никогда не понадобиться. Например, не требуется инициализация
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224 источника данных для передачи пользователю статических данных, сохраненных на диске.
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225
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226 Для решения этой проблемы используются специальные объекты C<IMPL::Config::Activator>.
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227
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228 Если у приложения описано свойство, в котором хранится C<IMPL::Config::Activator>, то
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229 при первом обращении к такому свойству, будет создан объект вызовом метода
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230 C<< IMPL::Config::Activator->activate() >> и возвращен как значение этого свойства.
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231 Таким образом реализуется прозрачная отложенная активация объектов, что позволяет
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232 экономить ресурсы.
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233
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234 =head1 MEMBERS
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235
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236 =over
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237
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238 =item C<[static] LoadXMLFile($fileName) >
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239
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240 Создает из XML файла C<$fileName> экземпляр приложения
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241
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242 =item C<SaveXMLFile($fileName)>
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243
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244 Сохраняет приложение в файл C<$fileName>
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245
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246 =item C<[get] xml >
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247
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248 Сохраняет конфигурацию приложения в XML строку.
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249
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250 =item C<[static,operator] spawn($file)>
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251
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252 Синоним для C<LoadXMLFile>, предполагается использование как оператора.
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253
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254 =item C<rawGet($propname,...)>
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255
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256 Метод для получения значений свойств приложения. Данный метод позволяет избежать
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257 использование активации объектов через C<IMPL::Config::Activator>.
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258
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259 =back
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260
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261 =cut