Total Complexity | 69 |
Total Lines | 700 |
Duplicated Lines | 0 % |
Changes | 0 |
Complex classes like ExecutionStrategy often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use ExecutionStrategy, and based on these observations, apply Extract Interface, too.
1 | <?php |
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35 | abstract class ExecutionStrategy |
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36 | { |
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37 | /** |
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38 | * @var ExecutionContext |
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39 | */ |
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40 | protected $context; |
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41 | |||
42 | /** |
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43 | * @var OperationDefinitionNode |
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44 | */ |
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45 | protected $operation; |
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46 | |||
47 | /** |
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48 | * @var mixed |
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49 | */ |
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50 | protected $rootValue; |
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51 | |||
52 | |||
53 | /** |
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54 | * @var ValuesResolver |
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55 | */ |
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56 | protected $valuesResolver; |
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57 | |||
58 | /** |
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59 | * @var array |
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60 | */ |
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61 | protected $finalResult; |
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62 | |||
63 | /** |
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64 | * AbstractStrategy constructor. |
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65 | * @param ExecutionContext $context |
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66 | * |
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67 | * @param OperationDefinitionNode $operation |
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68 | */ |
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69 | public function __construct( |
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70 | ExecutionContext $context, |
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71 | OperationDefinitionNode $operation, |
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72 | $rootValue, |
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73 | $valueResolver |
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74 | ) { |
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75 | $this->context = $context; |
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76 | $this->operation = $operation; |
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77 | $this->rootValue = $rootValue; |
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78 | $this->valuesResolver = $valueResolver; |
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79 | } |
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80 | |||
81 | /** |
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82 | * @return array|null |
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83 | */ |
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84 | abstract function execute(): ?array; |
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85 | |||
86 | /** |
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87 | * @param ObjectType $runtimeType |
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88 | * @param SelectionSetNode $selectionSet |
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89 | * @param $fields |
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90 | * @param $visitedFragmentNames |
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91 | * @return mixed |
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92 | * @throws InvalidTypeException |
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93 | * @throws \Digia\GraphQL\Error\ExecutionException |
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94 | * @throws \Digia\GraphQL\Error\InvariantException |
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95 | */ |
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96 | protected function collectFields( |
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97 | ObjectType $runtimeType, |
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98 | SelectionSetNode $selectionSet, |
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99 | $fields, |
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100 | $visitedFragmentNames |
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101 | ) { |
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102 | foreach ($selectionSet->getSelections() as $selection) { |
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103 | switch ($selection->getKind()) { |
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104 | case NodeKindEnum::FIELD: |
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105 | /** @var FieldNode $selection */ |
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106 | $fieldName = $this->getFieldNameKey($selection); |
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107 | if (!isset($runtimeType->getFields()[$selection->getNameValue()])) { |
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108 | continue 2; |
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109 | } |
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110 | if (!isset($fields[$fieldName])) { |
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111 | $fields[$fieldName] = new \ArrayObject(); |
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112 | } |
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113 | $fields[$fieldName][] = $selection; |
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114 | break; |
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115 | case NodeKindEnum::INLINE_FRAGMENT: |
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116 | /** @var FragmentDefinitionNode $selection */ |
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117 | if (!$this->shouldIncludeNode($selection) || |
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118 | !$this->doesFragmentConditionMatch($selection, $runtimeType) |
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119 | ) { |
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120 | continue 2; |
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121 | } |
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122 | $this->collectFields( |
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123 | $runtimeType, |
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124 | $selection->getSelectionSet(), |
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125 | $fields, |
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126 | $visitedFragmentNames |
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127 | ); |
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128 | break; |
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129 | case NodeKindEnum::FRAGMENT_SPREAD: |
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130 | $fragmentName = $selection->getNameValue(); |
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131 | if (!empty($visitedFragmentNames[$fragmentName]) || !$this->shouldIncludeNode($selection)) { |
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132 | continue 2; |
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133 | } |
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134 | $visitedFragmentNames[$fragmentName] = true; |
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135 | /** @var FragmentDefinitionNode $fragment */ |
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136 | $fragment = $this->context->getFragments()[$fragmentName]; |
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137 | $this->collectFields( |
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138 | $runtimeType, |
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139 | $fragment->getSelectionSet(), |
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140 | $fields, |
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141 | $visitedFragmentNames |
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142 | ); |
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143 | break; |
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144 | } |
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145 | } |
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146 | |||
147 | return $fields; |
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148 | } |
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149 | |||
150 | |||
151 | /** |
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152 | * @param $node |
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153 | * @return bool |
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154 | * @throws InvalidTypeException |
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155 | * @throws \Digia\GraphQL\Error\ExecutionException |
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156 | * @throws \Digia\GraphQL\Error\InvariantException |
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157 | */ |
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158 | private function shouldIncludeNode(NodeInterface $node) |
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159 | { |
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160 | $skip = $this->valuesResolver->getDirectiveValues(GraphQLSkipDirective(), $node, |
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161 | $this->context->getVariableValues()); |
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162 | |||
163 | if ($skip && $skip['if'] === true) { |
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164 | return false; |
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165 | } |
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166 | |||
167 | $include = $this->valuesResolver->getDirectiveValues(GraphQLSkipDirective(), $node, |
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168 | $this->context->getVariableValues()); |
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169 | |||
170 | if ($include && $include['if'] === false) { |
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171 | return false; |
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172 | } |
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173 | |||
174 | return true; |
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175 | } |
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176 | |||
177 | /** |
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178 | * @param FragmentDefinitionNode|InlineFragmentNode $fragment |
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179 | * @param ObjectType $type |
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180 | * @return bool |
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181 | * @throws InvalidTypeException |
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182 | */ |
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183 | private function doesFragmentConditionMatch(NodeInterface $fragment, ObjectType $type) |
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184 | { |
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185 | $typeConditionNode = $fragment->getTypeCondition(); |
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186 | |||
187 | if (!$typeConditionNode) { |
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188 | return true; |
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189 | } |
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190 | |||
191 | $conditionalType = typeFromAST($this->context->getSchema(), $typeConditionNode); |
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192 | |||
193 | if ($conditionalType === $type) { |
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194 | return true; |
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195 | } |
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196 | |||
197 | if ($conditionalType instanceof AbstractTypeInterface) { |
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198 | return $this->context->getSchema()->isPossibleType($conditionalType, $type); |
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199 | } |
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200 | |||
201 | return false; |
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202 | } |
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203 | |||
204 | /** |
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205 | * @TODO: consider to move this to FieldNode |
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206 | * @param FieldNode $node |
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207 | * @return string |
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208 | */ |
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209 | private function getFieldNameKey(FieldNode $node) |
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210 | { |
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211 | return $node->getAlias() ? $node->getAlias()->getValue() : $node->getNameValue(); |
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212 | } |
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213 | |||
214 | /** |
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215 | * Implements the "Evaluating selection sets" section of the spec for "read" mode. |
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216 | * @param ObjectType $objectType |
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217 | * @param $rootValue |
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218 | * @param $path |
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219 | * @param $fields |
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220 | * @return array |
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221 | * @throws InvalidTypeException |
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222 | * @throws \Digia\GraphQL\Error\ExecutionException |
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223 | * @throws \Digia\GraphQL\Error\InvariantException |
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224 | * @throws \Throwable |
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225 | */ |
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226 | protected function executeFields( |
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227 | ObjectType $objectType, |
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228 | $rootValue, |
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229 | $path, |
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230 | $fields |
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231 | ): array { |
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232 | $finalResults = []; |
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233 | |||
234 | foreach ($fields as $fieldName => $fieldNodes) { |
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235 | $fieldPath = $path; |
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236 | $fieldPath[] = $fieldName; |
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237 | |||
238 | $result = $this->resolveField( |
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239 | $objectType, |
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240 | $rootValue, |
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241 | $fieldNodes, |
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242 | $fieldPath |
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243 | ); |
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244 | |||
245 | $finalResults[$fieldName] = $result; |
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246 | } |
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247 | |||
248 | return $finalResults; |
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249 | } |
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250 | |||
251 | /** |
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252 | * Implements the "Evaluating selection sets" section of the spec for "write" mode. |
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253 | * |
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254 | * @param ObjectType $objectType |
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255 | * @param $rootValue |
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256 | * @param $path |
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257 | * @param $fields |
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258 | * @return array |
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259 | * @throws InvalidTypeException |
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260 | * @throws \Digia\GraphQL\Error\ExecutionException |
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261 | * @throws \Digia\GraphQL\Error\InvariantException |
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262 | * @throws \Throwable |
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263 | */ |
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264 | public function executeFieldsSerially(ObjectType $objectType, $rootValue, $path, $fields) |
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265 | { |
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266 | //@TODO execute fields serially |
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267 | $finalResults = []; |
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268 | |||
269 | foreach ($fields as $fieldName => $fieldNodes) { |
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270 | $fieldPath = $path; |
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271 | $fieldPath[] = $fieldName; |
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272 | |||
273 | $result = $this->resolveField($objectType, |
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274 | $rootValue, |
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275 | $fieldNodes, |
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276 | $fieldPath |
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277 | ); |
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278 | |||
279 | $finalResults[$fieldName] = $result; |
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280 | } |
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281 | |||
282 | return $finalResults; |
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283 | } |
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284 | |||
285 | /** |
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286 | * @param Schema $schema |
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287 | * @param ObjectType $parentType |
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288 | * @param string $fieldName |
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289 | * @return \Digia\GraphQL\Type\Definition\Field|null |
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290 | * @throws InvalidTypeException |
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291 | */ |
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292 | public function getFieldDefinition(Schema $schema, ObjectType $parentType, string $fieldName) |
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293 | { |
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294 | $schemaMetaFieldDefinition = SchemaMetaFieldDefinition(); |
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295 | $typeMetaFieldDefinition = TypeMetaFieldDefinition(); |
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296 | $typeNameMetaFieldDefinition = TypeNameMetaFieldDefinition(); |
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297 | |||
298 | if ($fieldName === $schemaMetaFieldDefinition->getName() && $schema->getQuery() === $parentType) { |
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299 | return $schemaMetaFieldDefinition; |
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300 | } |
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301 | |||
302 | if ($fieldName === $typeMetaFieldDefinition->getName() && $schema->getQuery() === $parentType) { |
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303 | return $typeMetaFieldDefinition; |
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304 | } |
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305 | |||
306 | if ($fieldName === $typeNameMetaFieldDefinition->getName()) { |
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307 | return $typeNameMetaFieldDefinition; |
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308 | } |
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309 | |||
310 | $fields = $parentType->getFields(); |
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311 | |||
312 | return $fields[$fieldName] ?? null; |
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313 | } |
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314 | |||
315 | |||
316 | /** |
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317 | * @param ObjectType $parentType |
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318 | * @param $rootValue |
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319 | * @param $fieldNodes |
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320 | * @param $path |
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321 | * @return array|null|\Throwable |
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322 | * @throws InvalidTypeException |
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323 | * @throws \Digia\GraphQL\Error\ExecutionException |
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324 | * @throws \Digia\GraphQL\Error\InvariantException |
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325 | * @throws \Throwable |
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326 | */ |
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327 | protected function resolveField( |
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328 | ObjectType $parentType, |
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329 | $rootValue, |
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330 | $fieldNodes, |
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331 | $path |
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332 | ) { |
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333 | /** @var FieldNode $fieldNode */ |
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334 | $fieldNode = $fieldNodes[0]; |
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335 | |||
336 | $field = $this->getFieldDefinition($this->context->getSchema(), $parentType, $fieldNode->getNameValue()); |
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337 | |||
338 | if (!$field) { |
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339 | return null; |
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340 | } |
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341 | |||
342 | $info = $this->buildResolveInfo($fieldNodes, $fieldNode, $field, $parentType, $path, $this->context); |
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343 | |||
344 | $resolveFunction = $this->determineResolveFunction($field, $parentType, $this->context); |
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345 | |||
346 | $result = $this->resolveFieldValueOrError( |
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347 | $field, |
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348 | $fieldNode, |
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349 | $resolveFunction, |
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350 | $rootValue, |
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351 | $this->context, |
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352 | $info |
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353 | ); |
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354 | |||
355 | $result = $this->completeValueCatchingError( |
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356 | $field->getType(), |
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357 | $fieldNodes, |
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358 | $info, |
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359 | $path, |
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360 | $result// $result is passed as $source |
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361 | ); |
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362 | |||
363 | return $result; |
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364 | } |
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365 | |||
366 | /** |
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367 | * @param array $fieldNodes |
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368 | * @param FieldNode $fieldNode |
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369 | * @param Field $field |
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370 | * @param ObjectType $parentType |
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371 | * @param $path |
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372 | * @param ExecutionContext $context |
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373 | * @return ResolveInfo |
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374 | */ |
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375 | private function buildResolveInfo( |
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376 | \ArrayAccess $fieldNodes, |
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377 | FieldNode $fieldNode, |
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378 | Field $field, |
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379 | ObjectType $parentType, |
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380 | $path, |
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381 | ExecutionContext $context |
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382 | ) { |
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383 | return new ResolveInfo([ |
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384 | 'fieldName' => $fieldNode->getNameValue(), |
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385 | 'fieldNodes' => $fieldNodes, |
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386 | 'returnType' => $field->getType(), |
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387 | 'parentType' => $parentType, |
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388 | 'path' => $path, |
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389 | 'schema' => $context->getSchema(), |
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390 | 'fragments' => $context->getFragments(), |
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391 | 'rootValue' => $context->getRootValue(), |
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392 | 'operation' => $context->getOperation(), |
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393 | 'variableValues' => $context->getVariableValues(), |
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394 | ]); |
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395 | } |
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396 | |||
397 | /** |
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398 | * @param Field $field |
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399 | * @param ObjectType $objectType |
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400 | * @param ExecutionContext $context |
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401 | * @return callable|mixed|null |
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402 | */ |
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403 | private function determineResolveFunction(Field $field, ObjectType $objectType, ExecutionContext $context) |
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404 | { |
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405 | |||
406 | if ($field->hasResolve()) { |
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407 | return $field->getResolve(); |
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408 | } |
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409 | |||
410 | if ($objectType->hasResolve()) { |
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411 | return $objectType->getResolve(); |
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412 | } |
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413 | |||
414 | return $this->context->getFieldResolver(); |
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415 | } |
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416 | |||
417 | /** |
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418 | * @param TypeInterface $fieldType |
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419 | * @param $fieldNodes |
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420 | * @param ResolveInfo $info |
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421 | * @param $path |
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422 | * @param $result |
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423 | * @return null |
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424 | * @throws \Throwable |
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425 | */ |
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426 | public function completeValueCatchingError( |
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427 | TypeInterface $fieldType, |
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428 | $fieldNodes, |
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429 | ResolveInfo $info, |
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430 | $path, |
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431 | &$result |
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432 | ) { |
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433 | if ($fieldType instanceof NonNullType) { |
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434 | return $this->completeValueWithLocatedError( |
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435 | $fieldType, |
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436 | $fieldNodes, |
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437 | $info, |
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438 | $path, |
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439 | $result |
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440 | ); |
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441 | } |
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442 | |||
443 | try { |
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444 | $completed = $this->completeValueWithLocatedError( |
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445 | $fieldType, |
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446 | $fieldNodes, |
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447 | $info, |
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448 | $path, |
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449 | $result |
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450 | ); |
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451 | |||
452 | return $completed; |
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453 | } catch (\Exception $ex) { |
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454 | $this->context->addError(new ExecutionException($ex->getMessage())); |
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455 | return null; |
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456 | } |
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457 | } |
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458 | |||
459 | /** |
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460 | * @param TypeInterface $fieldType |
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461 | * @param $fieldNodes |
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462 | * @param ResolveInfo $info |
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463 | * @param $path |
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464 | * @param $result |
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465 | * @throws \Throwable |
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466 | */ |
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467 | public function completeValueWithLocatedError( |
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468 | TypeInterface $fieldType, |
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469 | $fieldNodes, |
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470 | ResolveInfo $info, |
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471 | $path, |
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472 | $result |
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473 | ) { |
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474 | try { |
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475 | $completed = $this->completeValue( |
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476 | $fieldType, |
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477 | $fieldNodes, |
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478 | $info, |
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479 | $path, |
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480 | $result |
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481 | ); |
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482 | return $completed; |
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483 | } catch (\Exception $ex) { |
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484 | //@TODO throw located error |
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485 | throw $ex; |
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486 | } catch (\Throwable $ex) { |
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487 | //@TODO throw located error |
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488 | throw $ex; |
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489 | } |
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490 | } |
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491 | |||
492 | /** |
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493 | * @param TypeInterface $returnType |
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494 | * @param $fieldNodes |
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495 | * @param ResolveInfo $info |
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496 | * @param $path |
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497 | * @param $result |
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498 | * @return array|mixed |
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499 | * @throws ExecutionException |
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500 | * @throws \Throwable |
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501 | */ |
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502 | private function completeValue( |
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503 | TypeInterface $returnType, |
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504 | $fieldNodes, |
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505 | ResolveInfo $info, |
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506 | $path, |
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507 | &$result |
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508 | ) { |
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509 | if ($result instanceof \Exception || $result instanceof \Throwable) { |
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510 | throw $result; |
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511 | } |
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512 | |||
513 | // If result is null-like, return null. |
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514 | if (null === $result) { |
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515 | return null; |
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516 | } |
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517 | |||
518 | if ($returnType instanceof NonNullType) { |
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519 | $completed = $this->completeValue( |
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520 | $returnType->getOfType(), |
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521 | $fieldNodes, |
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522 | $info, |
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523 | $path, |
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524 | $result |
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525 | ); |
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526 | |||
527 | if ($completed === null) { |
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528 | throw new ExecutionException( |
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529 | sprintf( |
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530 | 'Cannot return null for non-nullable field %s.%s.', |
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531 | $info->getParentType(), $info->getFieldName() |
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532 | ) |
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533 | ); |
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534 | } |
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535 | |||
536 | return $completed; |
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537 | } |
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538 | |||
539 | // If field type is List, complete each item in the list with the inner type |
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540 | if ($returnType instanceof ListType) { |
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541 | return $this->completeListValue($returnType, $fieldNodes, $info, $path, $result); |
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542 | } |
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543 | |||
544 | |||
545 | // If field type is Scalar or Enum, serialize to a valid value, returning |
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546 | // null if serialization is not possible. |
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547 | if ($returnType instanceof LeafTypeInterface) { |
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548 | return $this->completeLeafValue($returnType, $result); |
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549 | } |
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550 | |||
551 | //@TODO Make a funnction for checking abstract type? |
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552 | if ($returnType instanceof InterfaceType || $returnType instanceof UnionType) { |
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553 | return $this->completeAbstractValue($returnType, $fieldNodes, $info, $path, $result); |
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554 | } |
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555 | |||
556 | // Field type must be Object, Interface or Union and expect sub-selections. |
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557 | if ($returnType instanceof ObjectType) { |
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558 | return $this->completeObjectValue($returnType, $fieldNodes, $info, $path, $result); |
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559 | } |
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560 | |||
561 | throw new ExecutionException("Cannot complete value of unexpected type \"{$returnType}\"."); |
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562 | } |
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563 | |||
564 | /** |
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565 | * @param AbstractTypeInterface $returnType |
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566 | * @param $fieldNodes |
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567 | * @param ResolveInfo $info |
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568 | * @param $path |
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569 | * @param $result |
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570 | * @return array |
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571 | * @throws ExecutionException |
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572 | * @throws InvalidTypeException |
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573 | * @throws \Digia\GraphQL\Error\InvariantException |
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574 | * @throws \Throwable |
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575 | */ |
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576 | private function completeAbstractValue( |
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577 | AbstractTypeInterface $returnType, |
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578 | $fieldNodes, |
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579 | ResolveInfo $info, |
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580 | $path, |
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581 | &$result |
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582 | ) { |
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583 | $runtimeType = $returnType->resolveType($result, $this->context, $info); |
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584 | |||
585 | if (null === $runtimeType) { |
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586 | throw new ExecutionException( |
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587 | sprintf( |
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588 | "GraphQL Interface Type `%s` returned `null` from it`s `resolveType` function for value: %s", |
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589 | $returnType->getName(), toString($result) |
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590 | ) |
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591 | ); |
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592 | } |
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593 | |||
594 | //@TODO Check if $runtimeType is a valid runtime type |
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595 | return $this->completeObjectValue( |
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596 | $runtimeType, |
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597 | $fieldNodes, |
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598 | $info, |
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599 | $path, |
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600 | $result |
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601 | ); |
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602 | } |
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603 | |||
604 | /** |
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605 | * @param ListType $returnType |
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606 | * @param $fieldNodes |
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607 | * @param ResolveInfo $info |
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608 | * @param $path |
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609 | * @param $result |
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610 | * @return array |
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611 | * @throws \Throwable |
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612 | */ |
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613 | private function completeListValue(ListType $returnType, $fieldNodes, ResolveInfo $info, $path, &$result) |
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614 | { |
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615 | $itemType = $returnType->getOfType(); |
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616 | |||
617 | $completedItems = []; |
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618 | |||
619 | foreach ($result as $key => $item) { |
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620 | $fieldPath = $path; |
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621 | $fieldPath[] = $key; |
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622 | $completedItem = $this->completeValueCatchingError($itemType, $fieldNodes, $info, $fieldPath, $item); |
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623 | $completedItems[] = $completedItem; |
||
624 | } |
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625 | |||
626 | return $completedItems; |
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627 | } |
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628 | |||
629 | /** |
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630 | * @param LeafTypeInterface $returnType |
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631 | * @param $result |
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632 | * @return mixed |
||
633 | * @throws ExecutionException |
||
634 | */ |
||
635 | private function completeLeafValue(LeafTypeInterface $returnType, &$result) |
||
636 | { |
||
637 | $serializedResult = $returnType->serialize($result); |
||
638 | |||
639 | if ($serializedResult === null) { |
||
640 | throw new ExecutionException( |
||
641 | 'Expected a value of type "' . toString($returnType) . '" but received: ' . toString($result) |
||
642 | ); |
||
643 | } |
||
644 | |||
645 | return $serializedResult; |
||
646 | } |
||
647 | |||
648 | /** |
||
649 | * @param ObjectType $returnType |
||
650 | * @param $fieldNodes |
||
651 | * @param ResolveInfo $info |
||
652 | * @param $path |
||
653 | * @param $result |
||
654 | * @return array |
||
655 | * @throws ExecutionException |
||
656 | * @throws InvalidTypeException |
||
657 | * @throws \Digia\GraphQL\Error\InvariantException |
||
658 | * @throws \Throwable |
||
659 | */ |
||
660 | private function completeObjectValue(ObjectType $returnType, $fieldNodes, ResolveInfo $info, $path, &$result) |
||
661 | { |
||
662 | return $this->collectAndExecuteSubfields( |
||
663 | $returnType, |
||
664 | $fieldNodes, |
||
665 | $info, |
||
666 | $path, |
||
667 | $result |
||
668 | ); |
||
669 | } |
||
670 | |||
671 | /** |
||
672 | * @param Field $field |
||
673 | * @param FieldNode $fieldNode |
||
674 | * @param callable $resolveFunction |
||
675 | * @param $rootValue |
||
676 | * @param ExecutionContext $context |
||
677 | * @param ResolveInfo $info |
||
678 | * @return array|\Throwable |
||
679 | */ |
||
680 | private function resolveFieldValueOrError( |
||
681 | Field $field, |
||
682 | FieldNode $fieldNode, |
||
683 | callable $resolveFunction, |
||
684 | $rootValue, |
||
685 | ExecutionContext $context, |
||
686 | ResolveInfo $info |
||
687 | ) { |
||
688 | try { |
||
689 | $args = $this->valuesResolver->coerceArgumentValues($field, $fieldNode, $context->getVariableValues()); |
||
690 | |||
691 | return $resolveFunction($rootValue, $args, $context->getContextValue(), $info); |
||
692 | } catch (\Throwable $error) { |
||
693 | return $error; |
||
694 | } |
||
695 | } |
||
696 | |||
697 | /** |
||
698 | * @param ObjectType $returnType |
||
699 | * @param $fieldNodes |
||
700 | * @param ResolveInfo $info |
||
701 | * @param $path |
||
702 | * @param $result |
||
703 | * @return array |
||
704 | * @throws InvalidTypeException |
||
705 | * @throws \Digia\GraphQL\Error\ExecutionException |
||
706 | * @throws \Digia\GraphQL\Error\InvariantException |
||
707 | * @throws \Throwable |
||
708 | */ |
||
709 | private function collectAndExecuteSubFields( |
||
735 | } |
||
736 | } |
||
737 |
Adding explicit visibility (
private
,protected
, orpublic
) is generally recommend to communicate to other developers how, and from where this method is intended to be used.