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1 | <?php |
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2 | |||
3 | namespace Doctrine\ODM\CouchDB\Mapping\Driver; |
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4 | |||
5 | use Doctrine\Common\Persistence\Mapping\Driver\FileDriver, |
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6 | Doctrine\Common\Persistence\Mapping\ClassMetadata, |
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7 | Doctrine\ODM\CouchDB\Mapping\MappingException, |
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8 | Doctrine\Common\Persistence\Mapping\MappingException as DoctrineMappingException, |
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9 | Symfony\Component\Yaml\Yaml; |
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10 | |||
11 | /** |
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12 | * The YamlDriver reads the mapping metadata from yaml schema files. |
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13 | * |
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14 | * @license http://www.opensource.org/licenses/lgpl-license.php LGPL |
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15 | * @link www.doctrine-project.org |
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16 | * @since 1.0 |
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17 | * @author Jonathan H. Wage <[email protected]> |
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18 | * @author Roman Borschel <[email protected]> |
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19 | */ |
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20 | class YamlDriver extends FileDriver |
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21 | { |
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22 | const DEFAULT_FILE_EXTENSION = '.dcm.yml'; |
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23 | |||
24 | /** |
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25 | * {@inheritDoc} |
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26 | */ |
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27 | public function __construct($locator, $fileExtension = self::DEFAULT_FILE_EXTENSION) |
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28 | { |
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29 | parent::__construct($locator, $fileExtension); |
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30 | } |
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31 | |||
32 | /** |
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33 | * {@inheritdoc} |
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34 | */ |
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35 | public function loadMetadataForClass($className, ClassMetadata $class) |
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36 | { |
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37 | /** @var $class \Doctrine\ODM\CouchDB\Mapping\ClassMetadata */ |
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38 | try { |
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39 | $element = $this->getElement($className); |
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40 | } catch (DoctrineMappingException $e) { |
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41 | // Convert Exception type for consistency with other drivers |
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42 | throw new MappingException($e->getMessage(), $e->getCode(), $e); |
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43 | } |
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44 | |||
45 | if (!$element) { |
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46 | return; |
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47 | } |
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48 | |||
49 | if ($element['type'] == 'document') { |
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50 | $class->setCustomRepositoryClass( |
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51 | (isset($element['repositoryClass'])) ? $element['repositoryClass'] : null |
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52 | ); |
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53 | |||
54 | if (isset($element['indexed']) && $element['indexed'] == true) { |
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55 | $class->indexed = true; |
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56 | } |
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57 | |||
58 | if (isset($element['inheritanceRoot']) && $element['inheritanceRoot']) { |
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59 | $class->markInheritanceRoot(); |
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60 | } |
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61 | } else if ($element['type'] == 'embedded') { |
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62 | $class->isEmbeddedDocument = true; |
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63 | |||
64 | if (isset($element['inheritanceRoot']) && $element['inheritanceRoot']) { |
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65 | $class->markInheritanceRoot(); |
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66 | } |
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67 | } else if (strtolower($element['type']) == "mappedsuperclass") { |
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68 | $class->isMappedSuperclass = true; |
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69 | } else { |
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70 | throw MappingException::classIsNotAValidDocument($className); |
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71 | } |
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72 | |||
73 | View Code Duplication | if (isset($element['id'])) { |
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74 | foreach ($element['id'] AS $fieldName => $idElement) { |
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75 | $class->mapField(array( |
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76 | 'fieldName' => $fieldName, |
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77 | 'indexed' => (isset($idElement['index'])) ? (bool)$idElement['index'] : false, |
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78 | 'type' => (isset($idElement['type'])) ? $idElement['type'] : null, |
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79 | 'id' => true, |
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80 | 'strategy' => (isset($idElement['strategy'])) ? $idElement['strategy'] : null, |
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81 | )); |
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82 | } |
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83 | } |
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84 | |||
85 | View Code Duplication | if (isset($element['fields'])) { |
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86 | foreach ($element['fields'] AS $fieldName => $fieldElement) { |
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87 | $class->mapField(array( |
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88 | 'fieldName' => $fieldName, |
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89 | 'jsonName' => (isset($fieldElement['jsonName'])) ? $fieldElement['jsonName'] : null, |
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90 | 'indexed' => (isset($fieldElement['index'])) ? (bool)$fieldElement['index'] : false, |
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91 | 'type' => (isset($fieldElement['type'])) ? $fieldElement['type'] : null, |
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92 | 'isVersionField' => (isset($fieldElement['version'])) ? true : null, |
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93 | )); |
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94 | } |
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95 | } |
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96 | |||
97 | |||
98 | View Code Duplication | if (isset($element['referenceOne'])) { |
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99 | foreach ($element['referenceOne'] AS $field => $referenceOneElement) { |
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100 | $class->mapManyToOne(array( |
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101 | 'cascade' => (isset($referenceOneElement['cascade'])) ? $this->getCascadeMode($referenceOneElement['cascade']) : 0, |
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102 | 'targetDocument' => (string)$referenceOneElement['targetDocument'], |
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103 | 'fieldName' => $field, |
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104 | 'jsonName' => (isset($referenceOneElement['jsonName'])) ? (string)$referenceOneElement['jsonName'] : null, |
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105 | 'indexed' => (isset($referenceOneElement['index'])) ? (bool)$referenceOneElement['index'] : false, |
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106 | )); |
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107 | } |
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108 | } |
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109 | |||
110 | View Code Duplication | if (isset($element['referenceMany'])) { |
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111 | foreach ($element['referenceMany'] AS $field => $referenceManyElement) { |
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112 | $class->mapManyToMany(array( |
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113 | 'cascade' => (isset($referenceManyElement['cascade'])) ? $this->getCascadeMode($referenceManyElement['cascade']) : 0, |
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114 | 'targetDocument' => (string)$referenceManyElement['targetDocument'], |
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115 | 'fieldName' => $field, |
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116 | 'jsonName' => (isset($referenceManyElement['jsonName'])) ? (string)$referenceManyElement['jsonName'] : null, |
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117 | 'mappedBy' => (isset($referenceManyElement['mappedBy'])) ? (string)$referenceManyElement['mappedBy'] : null, |
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118 | )); |
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119 | } |
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120 | } |
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121 | |||
122 | if (isset($element['attachments'])) { |
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123 | $class->mapAttachments($element['attachments']); |
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124 | } |
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125 | |||
126 | View Code Duplication | if (isset($element['embedOne'])) { |
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127 | foreach ($element['embedOne'] AS $field => $embedOneElement) { |
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128 | $class->mapEmbedded(array( |
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129 | 'targetDocument' => (string)$embedOneElement['targetDocument'], |
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130 | 'fieldName' => $field, |
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131 | 'jsonName' => (isset($embedOneElement['jsonName'])) ? (string)$embedOneElement['jsonName'] : null, |
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132 | 'embedded' => 'one', |
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133 | )); |
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134 | } |
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135 | } |
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136 | |||
137 | View Code Duplication | if (isset($element['embedMany'])) { |
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138 | foreach ($element['embedMany'] AS $field => $embedManyElement) { |
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139 | $class->mapEmbedded(array( |
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140 | 'targetDocument' => (string)$embedManyElement['targetDocument'], |
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141 | 'fieldName' => $field, |
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142 | 'jsonName' => (isset($embedManyElement['jsonName'])) ? (string)$embedManyElement['jsonName'] : null, |
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143 | 'embedded' => 'many', |
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144 | )); |
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145 | } |
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146 | } |
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147 | } |
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148 | |||
149 | protected function loadMappingFile($file) |
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150 | { |
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151 | return Yaml::parse(file_get_contents($file)); |
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152 | } |
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153 | |||
154 | /** |
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155 | * Gathers a list of cascade options found in the given cascade element. |
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156 | * |
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157 | * @param array $cascadeElement The cascade element. |
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158 | * @return integer a bitmask of cascade options. |
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159 | * @throws MappingException |
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160 | */ |
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161 | View Code Duplication | private function getCascadeMode(array $cascadeElement) |
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162 | { |
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163 | $cascade = 0; |
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164 | foreach ($cascadeElement as $cascadeMode) { |
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165 | $constantName = 'Doctrine\ODM\CouchDB\Mapping\ClassMetadata::CASCADE_' . strtoupper($cascadeMode); |
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166 | if (!defined($constantName)) { |
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167 | throw new MappingException("Cascade mode '$cascadeMode' not supported."); |
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168 | } |
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169 | $cascade |= constant($constantName); |
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170 | } |
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171 | |||
172 | return $cascade; |
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173 | } |
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174 | } |
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175 |
If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_function
expects aPost
object, and outputs the author of the post. The base classPost
returns a simple string and outputting a simple string will work just fine. However, the child classBlogPost
which is a sub-type ofPost
instead decided to return anobject
, and is therefore violating the SOLID principles. If aBlogPost
were passed tomy_function
, PHP would not complain, but ultimately fail when executing thestrtoupper
call in its body.