annotate Lib/IMPL/DOM/Transform/ObjectToDOM.pm @ 264:c9c2ec29793f

*IMPL::DOM::Transform: updated documentation
author sergey
date Wed, 09 Jan 2013 17:55:43 +0400
parents 0f59b2de72af
children 50ff1595bd62
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1 package IMPL::DOM::Transform::ObjectToDOM;
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2 use strict;
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3
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4 use IMPL::Const qw(:prop :access);
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5 use IMPL::declare {
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6 require => {
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7 PropertyInfo => 'IMPL::Class::PropertyInfo',
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8 Builder => 'IMPL::DOM::Navigator::Builder',
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9 Exception => 'IMPL::Exception',
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10 ArgumentException => '-IMPL::InvalidArgumentException',
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11 OperationException => '-IMPL::InvalidOperationException'
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12 },
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13 base => [
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14 'IMPL::Transform' => sub {
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15 -plain => 'TransformPlain',
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16 HASH => 'TransformHash',
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17 -default => 'TransformDefault'
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18 }
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19 ],
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20 props => [
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21 documentSchema => PROP_RO,
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22 _schema => PROP_RW,
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23 _navi => PROP_RW
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24 ]
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25 };
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26
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27 use constant {
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28 SchemaNode => 'IMPL::DOM::Schema::Node',
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29 ComplexNode => 'IMPL::DOM::Schema::ComplexNode'
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30 };
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31
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32 sub CTOR {
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33 my ($this,$docName,$docSchema,$transforms) = @_;
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34
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35 my $docNodeSchema = $docSchema->selectSingleNode(sub { $_->isa(SchemaNode) and $_->name eq $docName } )
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36 or die OperationException->new("Can't find a node schema for the document '$docName'");
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37
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38 my $docClass = ($docNodeSchema->can('nativeType') ? $docNodeSchema->nativeType : undef) || 'IMPL::DOM::Document';
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39
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40 $this->documentSchema($docNodeSchema);
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41
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42 $this->_navi(
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43 Builder->new(
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44 $docClass,
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45 $docSchema,
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46 ignoreUndefined => 1
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47 )
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48 );
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49 $this->_schema($docSchema);
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50
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51 $this->_navi->NavigateCreate($docName);
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52 $this->currentNode->nodeProperty(schemaDocument => $docSchema);
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53 }
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54
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55 sub TransformPlain {
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56 my ($this,$data) = @_;
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57
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58 $this->_navi->Current->nodeValue( $data );
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59 return $this->_navi->Current;
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60 }
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61
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62 sub currentNode {
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63 shift->_navi->Current;
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64 }
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65
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66 sub inflateNodeValue {
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67 shift->_navi->inflateValue(shift);
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68 }
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69
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70 sub TransformHash {
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71 my ($this,$data) = @_;
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72
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73 die ArgumentException->new(data => 'A HASH reference is required')
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74 unless ref $data eq 'HASH';
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75
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76 return $this->StoreObject($this->currentNode,$data)
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77 if !$this->currentNode->schema->isa(ComplexNode);
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78
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79 KEYLOOP: foreach my $key (keys %$data) {
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80 my $value = $data->{$key};
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81
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82 if (ref $value eq 'ARRAY') {
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83 #TODO: collapse empty values only if needed
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84 foreach my $subval (grep $_, @$value) {
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85
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86 $this->_navi->saveState();
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87
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88 my $node = $this->_navi->NavigateCreate($key);
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89
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90 unless(defined $node) {
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91 #$this->_navi->Back();
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92 $this->_navi->restoreState();
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93 next KEYLOOP;
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94 }
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95
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96 $this->_navi->applyState();
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97
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98 $this->Transform($subval);
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99
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100 $this->_navi->Back();
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101 }
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102 } else {
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103 $this->_navi->saveState();
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104 my $node = $this->_navi->NavigateCreate($key);
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105
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106 unless(defined $node) {
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107 #$this->_navi->Back();
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108 $this->_navi->restoreState();
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109 next KEYLOOP;
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110 }
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112 $this->_navi->applyState();
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113
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114 $this->Transform($value);
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115
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116 $this->_navi->Back();
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117 }
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118 }
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119 return $this->_navi->Current;
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120 }
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121
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122 # this method handles situatuions when a complex object must be stored in a
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123 # simple node.
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124 sub StoreObject {
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125 my ($this,$node,$data) = @_;
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126
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127 $node->nodeValue($data);
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128
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129 return $node;
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130 }
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131
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132 sub TransformDefault {
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133 my ($this,$data) = @_;
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134
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135 return $this->StoreObject($this->currentNode,$data)
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136 if !$this->currentNode->schema->isa(ComplexNode);
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137
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138 if ( ref $data and eval { $data->can('GetMeta') } ) {
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139 my %props = map {
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140 $_->name, 1
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141 } $data->GetMeta(PropertyInfo, sub { $_->access == ACCESS_PUBLIC }, 1 );
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142
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143 my %values = map {
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144 $_,
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145 $data->$_();
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146 } keys %props;
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147
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148 return $this->Transform(\%values);
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149 } else {
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150 die OperationException->new("Don't know how to transform $data");
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151 }
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152
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153 return $this->_navi->Current;
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154 }
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155
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156 sub buildErrors {
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157 my ($this) = @_;
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158
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159 return $this->_navi->buildErrors;
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160 }
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161
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162 1;
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163
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164 __END__
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165
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166 =pod
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167
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168 =head1 NAME
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169
263
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170 C<IMPL::DOM::Transform::ObjectToDOM> -преобразование объекта в DOM документ.
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171
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172 =head1 SYNOPSIS
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173
263
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174 =begin code
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175
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176 use IMPL::require {
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177 Schema => 'IMPL::DOM::Schema',
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178 Config => 'IMPL::Config'
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179 }
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180
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181 my $data = {
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182 id => '12313-232',
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183 name => 'Peter',
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184 age => 20
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185 };
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186
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187 my $schema = Schema->LoadSchema(Config->AppBase('schemas','person.xml'));
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188 my $transorm = IMPL::DOM::Transform::ObjectToDOM->new('edit', $schema);
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189
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190 my $form = $transform->Transform($data);
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191
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192 my @errors;
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193
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194 push @errors, $transform->buildErrors;
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195 push @errors, $schema->Validate($doc);
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196
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197 =end code
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198
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199 =head1 DESCRIPTION
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200
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201 Наследует C<IMPL::Transform>. Определяет базовые преобразования для хешей и
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202 объектов, поддерживающих метаданные.
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203
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204 Результатом выполнения преобразования является DOM документ. При построении
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205 документа используется навигатор C<IMPL::DOM::Navigator::Builder> для
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206 сопоставления схемы и свойств преобразуемого объекта. Элементы полученного
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207 документа имеют ссылки на соответствующие им элементы схемы.
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208
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209 После того, как документ построен и преобразование будет очищено, не останется
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210 объектов, которые бы ссылались на документ со схемой, поскольку элементы схемы
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211 имеют слабые ссылки на саму схему и не могут предотвратить ее удаление.
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212 Для предотвращения очитски документа схемы, ссылка на него сохраняется в
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213 атрибуте документа C<schemaDocument>, что обеспечит жизнь схемы на протяжении
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214 жизни документа.
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215
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216 Преобразование происходит рекурсивно, сначала используется метод
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217 C<NavigateCreate> для создания элемента соответсвующего свойству объекта,
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218 затем вызывается метод C<Transform> для преобразования значения свойства, при
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219 этом C<currentNode> указывает на только что созданный элемент документа.
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220
264
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221 Для изменения поведения преобразования можно добавлять новые обработчики, как
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222 в случае со стандартным преобразованием, а также можно унаследовать текущий
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223 класс для переопределения его некоторых методов.
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224
263
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225 =head1 MEMBERS
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226
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227 =head2 C<CTOR($docName,$schema)>
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228
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229 Создает преобразование, при этом будет создан документ состоящий только из
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230 корневого элемента с именем C<$docName> и будет найдена подходящий для него
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231 элемент схемы C<$schema>.
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232
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233 =over
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234
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235 =item * C<$docName>
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236
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237 Имя корневого узла документа, которое будет использовано для поиска
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238 соответствующего элемента схемы C<$schema>
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239
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240 =item * C<$schema>
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241
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242 Схема, содержащая описание документа. Если в данной схеме нет описания корневого
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243 элемента с именем C<$docName>, будет вызвано исключение.
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244
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245 =back
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246
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247 =head2 C<[get]documentSchema>
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248
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249 Элемент схемы C<ComplexNode> соответствующий документу. Определяется в
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250 конструкторе исходя из имени документа.
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251
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252 =head2 C<[get]currentNode>
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253
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254 Текущий элемент документа. После создания преобразования - это сам документ.
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255 Данное свойство использется внутри преобразования для работы с текущим
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256 элементом.
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257
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258 =head2 C<[virtual]StoreObject($node,$data)>
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259
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260 Метод, который вызывается преобразованием в случае если текущий узел документа
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261 является простым, а значени которое ему соответсвует является объектом (ссылкой).
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262
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263 По-умолчанию будет выполнено присваивание C<< $node->nodeValue($data) >>, однако
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264 это можно заменить, например, на преобразование в строку.
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265
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266 =head2 C<inflateNodeValue($data)>
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267
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268 Метод который используется для преобразования значений к правильным типам,
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269 используя атрибут C<inflator> элемента схемы. Этот метод можно использовать для
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270 C<TransformPlain>, однако по-умолчанию он не используется, поскольку
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271 предполагается, что входной объект имеет уже преобразованные значения в своих
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272 свойствах.
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273
236
2904da230022 DOM refactoring
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274 =cut