Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
1 | <?php |
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10 | abstract class DataTransferObject |
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11 | { |
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12 | protected bool $ignoreMissing = false; |
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13 | |||
14 | protected array $exceptKeys = []; |
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15 | |||
16 | protected array $onlyKeys = []; |
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17 | |||
18 | /** |
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19 | * @param array $parameters |
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20 | * |
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21 | * @return \Spatie\DataTransferObject\ImmutableDataTransferObject|static |
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22 | */ |
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23 | public static function immutable(array $parameters = []): ImmutableDataTransferObject |
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24 | { |
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25 | return new ImmutableDataTransferObject(new static($parameters)); |
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26 | } |
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27 | |||
28 | public function __construct(array $parameters = []) |
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29 | { |
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30 | $validators = $this->getFieldValidators(); |
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31 | |||
32 | $valueCaster = new ValueCaster(); |
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33 | |||
34 | foreach ($validators as $field => $validator) { |
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35 | if ( |
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36 | ! isset($parameters[$field]) |
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37 | && ! $validator->hasDefaultValue |
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38 | && ! $validator->isNullable |
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39 | ) { |
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40 | throw DataTransferObjectError::uninitialized( |
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41 | static::class, |
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42 | $field |
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43 | ); |
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44 | } |
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45 | |||
46 | $value = $parameters[$field] ?? $this->{$field} ?? null; |
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47 | |||
48 | if (is_array($value)) { |
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49 | $value = $valueCaster->cast($value, $validator); |
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50 | } |
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51 | |||
52 | if (! $validator->isValidType($value)) { |
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53 | throw DataTransferObjectError::invalidType( |
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54 | static::class, |
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55 | $field, |
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56 | $validator->allowedTypes, |
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57 | $value |
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58 | ); |
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59 | } |
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60 | |||
61 | $this->{$field} = $value; |
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62 | |||
63 | unset($parameters[$field]); |
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64 | } |
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65 | |||
66 | if (! $this->ignoreMissing && count($parameters)) { |
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67 | throw DataTransferObjectError::unknownProperties(array_keys($parameters), static::class); |
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68 | } |
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69 | } |
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70 | |||
71 | public function all(): array |
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72 | { |
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73 | $data = []; |
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74 | |||
75 | $class = new ReflectionClass(static::class); |
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76 | |||
77 | $properties = $class->getProperties(ReflectionProperty::IS_PUBLIC); |
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78 | |||
79 | foreach ($properties as $reflectionProperty) { |
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80 | $data[$reflectionProperty->getName()] = $reflectionProperty->getValue($this); |
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81 | } |
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82 | |||
83 | return $data; |
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84 | } |
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85 | |||
86 | /** |
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87 | * @param string ...$keys |
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88 | * |
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89 | * @return static |
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90 | */ |
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91 | public function only(string ...$keys): DataTransferObject |
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92 | { |
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93 | $dataTransferObject = clone $this; |
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94 | |||
95 | $dataTransferObject->onlyKeys = [...$this->onlyKeys, ...$keys]; |
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96 | |||
97 | return $dataTransferObject; |
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98 | } |
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99 | |||
100 | /** |
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101 | * @param string ...$keys |
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102 | * |
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103 | * @return static |
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104 | */ |
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105 | public function except(string ...$keys): DataTransferObject |
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106 | { |
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107 | $dataTransferObject = clone $this; |
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108 | |||
109 | $dataTransferObject->exceptKeys = [...$this->exceptKeys, ...$keys]; |
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110 | |||
111 | return $dataTransferObject; |
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112 | } |
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113 | |||
114 | public function toArray(): array |
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115 | { |
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116 | if (count($this->onlyKeys)) { |
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117 | $array = Arr::only($this->all(), $this->onlyKeys); |
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118 | } else { |
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119 | $array = Arr::except($this->all(), $this->exceptKeys); |
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120 | } |
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121 | |||
122 | $array = $this->parseArray($array); |
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123 | |||
124 | return $array; |
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125 | } |
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126 | |||
127 | protected function parseArray(array $array): array |
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128 | { |
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129 | foreach ($array as $key => $value) { |
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130 | if ( |
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131 | $value instanceof DataTransferObject |
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132 | || $value instanceof DataTransferObjectCollection |
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133 | ) { |
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134 | $array[$key] = $value->toArray(); |
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135 | |||
136 | continue; |
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137 | } |
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138 | |||
139 | if (! is_array($value)) { |
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140 | continue; |
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141 | } |
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142 | |||
143 | $array[$key] = $this->parseArray($value); |
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144 | } |
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145 | |||
146 | return $array; |
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147 | } |
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148 | |||
149 | /** |
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150 | * @param \ReflectionClass $class |
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151 | * |
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152 | * @return \Spatie\DataTransferObject\FieldValidator[] |
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153 | */ |
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154 | private function getFieldValidators(): array |
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155 | { |
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156 | return DTOCache::resolve(static::class, function () { |
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157 | $class = new ReflectionClass(static::class); |
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158 | |||
159 | $properties = []; |
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160 | |||
161 | foreach ($class->getProperties(ReflectionProperty::IS_PUBLIC) as $reflectionProperty) { |
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162 | $field = $reflectionProperty->getName(); |
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163 | |||
164 | $properties[$field] = FieldValidator::fromReflection($reflectionProperty); |
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165 | } |
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166 | |||
167 | return $properties; |
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168 | }); |
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169 | } |
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170 | } |
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171 |