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1 | <?php |
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2 | declare(strict_types=1); |
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3 | |||
4 | /** |
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5 | * This file is part of phpDocumentor. |
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6 | * |
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7 | * For the full copyright and license information, please view the LICENSE |
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8 | * file that was distributed with this source code. |
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9 | * |
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10 | * @author Mike van Riel <[email protected]> |
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11 | * @copyright 2010-2018 Mike van Riel / Naenius (http://www.naenius.com) |
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12 | * @license http://www.opensource.org/licenses/mit-license.php MIT |
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13 | * @link http://phpdoc.org |
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14 | */ |
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15 | |||
16 | namespace phpDocumentor\Descriptor; |
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17 | |||
18 | use phpDocumentor\Descriptor\Tag\VarDescriptor; |
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19 | use phpDocumentor\Reflection\Type; |
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20 | |||
21 | /** |
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22 | * Descriptor representing a property. |
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23 | */ |
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24 | class PropertyDescriptor extends DescriptorAbstract implements Interfaces\PropertyInterface, Interfaces\VisibilityInterface |
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25 | { |
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26 | /** @var ClassDescriptor|TraitDescriptor $parent */ |
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27 | protected $parent; |
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28 | |||
29 | /** @var string[]|null $types */ |
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30 | protected $types; |
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31 | |||
32 | /** @var string $default */ |
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33 | protected $default; |
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34 | |||
35 | /** @var bool $static */ |
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36 | protected $static = false; |
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37 | |||
38 | /** @var string $visibility */ |
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39 | protected $visibility = 'public'; |
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40 | |||
41 | /** |
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42 | * @param ClassDescriptor|TraitDescriptor $parent |
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43 | */ |
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44 | 2 | public function setParent($parent) |
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45 | { |
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46 | 2 | $this->setFullyQualifiedStructuralElementName( |
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47 | 2 | $parent->getFullyQualifiedStructuralElementName() . '::$' . $this->getName() |
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48 | ); |
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49 | |||
50 | 2 | $this->parent = $parent; |
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51 | 2 | } |
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52 | |||
53 | /** |
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54 | * @return ClassDescriptor|TraitDescriptor |
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55 | */ |
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56 | 1 | public function getParent() |
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57 | { |
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58 | 1 | return $this->parent; |
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59 | } |
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60 | |||
61 | /** |
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62 | * {@inheritDoc} |
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63 | */ |
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64 | 1 | public function setDefault($default) |
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65 | { |
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66 | 1 | $this->default = $default; |
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67 | 1 | } |
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68 | |||
69 | /** |
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70 | * {@inheritDoc} |
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71 | */ |
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72 | 1 | public function getDefault() |
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73 | { |
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74 | 1 | return $this->default; |
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75 | } |
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76 | |||
77 | /** |
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78 | * {@inheritDoc} |
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79 | */ |
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80 | 1 | public function setStatic($static) |
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81 | { |
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82 | 1 | $this->static = $static; |
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83 | 1 | } |
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84 | |||
85 | /** |
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86 | * {@inheritDoc} |
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87 | */ |
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88 | 1 | public function isStatic() |
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89 | { |
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90 | 1 | return $this->static; |
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91 | } |
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92 | |||
93 | /** |
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94 | * {@inheritDoc} |
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95 | */ |
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96 | 1 | public function setTypes(Type $types) |
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97 | { |
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98 | 1 | $this->types = $types; |
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99 | 1 | } |
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100 | |||
101 | /** |
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102 | * {@inheritDoc} |
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103 | */ |
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104 | public function getTypes() |
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105 | { |
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106 | return [$this->getType()]; |
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0 ignored issues
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107 | } |
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108 | |||
109 | public function getType() |
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110 | { |
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111 | if ($this->types === null) { |
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112 | /** @var VarDescriptor $var */ |
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113 | $var = $this->getVar()->getIterator()->current(); |
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114 | if ($var) { |
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115 | return $var->getType(); |
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116 | } |
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117 | } |
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118 | |||
119 | return $this->types; |
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120 | } |
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121 | |||
122 | /** |
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123 | * {@inheritDoc} |
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124 | */ |
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125 | 1 | public function setVisibility($visibility) |
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126 | { |
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127 | 1 | $this->visibility = $visibility; |
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128 | 1 | } |
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129 | |||
130 | /** |
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131 | * {@inheritDoc} |
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132 | */ |
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133 | 1 | public function getVisibility() |
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134 | { |
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135 | 1 | return $this->visibility; |
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136 | } |
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137 | |||
138 | /** |
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139 | * @return Collection |
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140 | */ |
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141 | 2 | public function getVar() |
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142 | { |
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143 | /** @var Collection $var */ |
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144 | 2 | $var = $this->getTags()->get('var', new Collection()); |
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145 | 2 | if ($var->count() !== 0) { |
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146 | 1 | return $var; |
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147 | } |
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148 | |||
149 | 2 | $inheritedElement = $this->getInheritedElement(); |
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150 | 2 | if ($inheritedElement) { |
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151 | 1 | return $inheritedElement->getVar(); |
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152 | } |
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153 | |||
154 | 1 | return new Collection(); |
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155 | } |
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156 | |||
157 | /** |
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158 | * Returns the file associated with the parent class or trait. |
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159 | * |
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160 | * @return FileDescriptor |
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161 | */ |
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162 | 1 | public function getFile() |
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163 | { |
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164 | 1 | return $this->getParent()->getFile(); |
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165 | } |
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166 | |||
167 | /** |
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168 | * Returns the property from which this one should inherit, if any. |
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169 | * |
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170 | * @return PropertyDescriptor|null |
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171 | */ |
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172 | 2 | public function getInheritedElement() |
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173 | { |
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174 | /** @var ClassDescriptor|InterfaceDescriptor|null $associatedClass */ |
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175 | 2 | $associatedClass = $this->getParent(); |
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176 | |||
177 | 2 | if (($associatedClass instanceof ClassDescriptor || $associatedClass instanceof InterfaceDescriptor) |
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178 | 1 | && ($associatedClass->getParent() instanceof ClassDescriptor |
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179 | 2 | || $associatedClass->getParent() instanceof InterfaceDescriptor |
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180 | ) |
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181 | ) { |
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182 | /** @var ClassDescriptor|InterfaceDescriptor $parentClass */ |
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183 | 1 | $parentClass = $associatedClass->getParent(); |
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184 | |||
185 | 1 | return $parentClass->getProperties()->get($this->getName()); |
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186 | } |
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187 | |||
188 | 1 | return null; |
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189 | } |
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190 | } |
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191 |
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.