thecodingmachine /
graphql-controllers
| Total Complexity | 54 |
| Total Lines | 385 |
| Duplicated Lines | 0 % |
| Changes | 0 | ||
Complex classes like RecursiveTypeMapper 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 RecursiveTypeMapper, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 28 | class RecursiveTypeMapper implements RecursiveTypeMapperInterface |
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| 29 | { |
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| 30 | /** |
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| 31 | * @var TypeMapperInterface |
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| 32 | */ |
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| 33 | private $typeMapper; |
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| 34 | |||
| 35 | /** |
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| 36 | * An array mapping a class name to the MappedClass instance (useful to know if the class has children) |
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| 37 | * |
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| 38 | * @var array<string,MappedClass>|null |
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| 39 | */ |
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| 40 | private $mappedClasses; |
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| 41 | |||
| 42 | /** |
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| 43 | * An array of interfaces OR object types if no interface matching. |
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| 44 | * |
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| 45 | * @var array<string,OutputType&Type> |
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| 46 | */ |
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| 47 | private $interfaces = []; |
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| 48 | |||
| 49 | /** |
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| 50 | * @var array<string,MutableObjectType> Key: FQCN |
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| 51 | */ |
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| 52 | private $classToTypeCache = []; |
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| 53 | |||
| 54 | /** |
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| 55 | * @var NamingStrategyInterface |
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| 56 | */ |
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| 57 | private $namingStrategy; |
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| 58 | |||
| 59 | /** |
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| 60 | * @var CacheInterface |
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| 61 | */ |
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| 62 | private $cache; |
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| 63 | |||
| 64 | /** |
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| 65 | * @var int|null |
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| 66 | */ |
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| 67 | private $ttl; |
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| 68 | |||
| 69 | /** |
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| 70 | * @var array<string, string> An array mapping a GraphQL interface name to the PHP class name that triggered its generation. |
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| 71 | */ |
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| 72 | private $interfaceToClassNameMap; |
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| 73 | |||
| 74 | /** |
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| 75 | * @var TypeRegistry |
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| 76 | */ |
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| 77 | private $typeRegistry; |
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| 78 | |||
| 79 | |||
| 80 | public function __construct(TypeMapperInterface $typeMapper, NamingStrategyInterface $namingStrategy, CacheInterface $cache, TypeRegistry $typeRegistry, ?int $ttl = null) |
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| 81 | { |
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| 82 | $this->typeMapper = $typeMapper; |
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| 83 | $this->namingStrategy = $namingStrategy; |
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| 84 | $this->cache = $cache; |
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| 85 | $this->ttl = $ttl; |
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| 86 | $this->typeRegistry = $typeRegistry; |
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| 87 | } |
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| 88 | |||
| 89 | /** |
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| 90 | * Returns true if this type mapper can map the $className FQCN to a GraphQL type. |
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| 91 | * |
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| 92 | * @param string $className The class name to look for (this function looks into parent classes if the class does not match a type). |
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| 93 | * @return bool |
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| 94 | */ |
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| 95 | public function canMapClassToType(string $className): bool |
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| 96 | { |
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| 97 | return $this->findClosestMatchingParent($className) !== null; |
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| 98 | } |
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| 99 | |||
| 100 | /** |
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| 101 | * Maps a PHP fully qualified class name to a GraphQL type. |
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| 102 | * |
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| 103 | * @param string $className The class name to look for (this function looks into parent classes if the class does not match a type) |
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| 104 | * @param (OutputType&MutableObjectType)|(OutputType&InterfaceType)|null $subType An optional sub-type if the main class is an iterator that needs to be typed. |
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| 105 | * @return MutableObjectType |
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| 106 | * @throws CannotMapTypeExceptionInterface |
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| 107 | */ |
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| 108 | public function mapClassToType(string $className, ?OutputType $subType): MutableObjectType |
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| 109 | { |
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| 110 | if (isset($this->classToTypeCache[$className])) { |
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| 111 | return $this->classToTypeCache[$className]; |
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| 112 | } |
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| 113 | |||
| 114 | $closestClassName = $this->findClosestMatchingParent($className); |
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| 115 | if ($closestClassName === null) { |
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| 116 | throw CannotMapTypeException::createForType($className); |
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| 117 | } |
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| 118 | $type = $this->typeMapper->mapClassToType($closestClassName, $subType, $this); |
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| 119 | |||
| 120 | // In the event this type was already part of cache, let's not extend it. |
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| 121 | if ($this->typeRegistry->hasType($type->name)) { |
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| 122 | $cachedType = $this->typeRegistry->getType($type->name); |
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| 123 | if ($cachedType !== $type) { |
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|
introduced
by
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| 124 | throw new \RuntimeException('Cached type in registry is not the type returned by type mapper.'); |
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| 125 | } |
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| 126 | //if ($cachedType->getStatus() === MutableObjectType::STATUS_FROZEN) { |
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| 127 | return $type; |
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| 128 | //} |
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| 129 | } |
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| 130 | |||
| 131 | $this->typeRegistry->registerType($type); |
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| 132 | $this->classToTypeCache[$className] = $type; |
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| 133 | |||
| 134 | $this->extendType($className, $type); |
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| 135 | |||
| 136 | $type->freeze(); |
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| 137 | |||
| 138 | return $type; |
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| 139 | } |
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| 140 | |||
| 141 | /** |
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| 142 | * Returns the closest parent that can be mapped, or null if nothing can be matched. |
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| 143 | * |
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| 144 | * @param string $className |
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| 145 | * @return string|null |
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| 146 | */ |
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| 147 | private function findClosestMatchingParent(string $className): ?string |
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| 148 | { |
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| 149 | do { |
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| 150 | if ($this->typeMapper->canMapClassToType($className)) { |
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| 151 | return $className; |
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| 152 | } |
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| 153 | } while ($className = get_parent_class($className)); |
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| 154 | return null; |
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| 155 | } |
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| 156 | |||
| 157 | /** |
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| 158 | * Extends a type using available type extenders. |
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| 159 | * |
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| 160 | * @param string $className |
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| 161 | * @param MutableObjectType $type |
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| 162 | * @throws CannotMapTypeExceptionInterface |
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| 163 | */ |
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| 164 | private function extendType(string $className, MutableObjectType $type): void |
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| 165 | { |
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| 166 | $classes = []; |
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| 167 | do { |
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| 168 | if ($this->typeMapper->canExtendTypeForClass($className, $type, $this)) { |
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| 169 | $classes[] = $className; |
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| 170 | } |
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| 171 | } while ($className = get_parent_class($className)); |
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| 172 | |||
| 173 | // Let's apply extenders from the most basic type. |
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| 174 | $classes = array_reverse($classes); |
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| 175 | foreach ($classes as $class) { |
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| 176 | $this->typeMapper->extendTypeForClass($class, $type, $this); |
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| 177 | } |
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| 178 | } |
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| 179 | |||
| 180 | /** |
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| 181 | * Maps a PHP fully qualified class name to a GraphQL type. Returns an interface if possible (if the class |
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| 182 | * has children) or returns an output type otherwise. |
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| 183 | * |
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| 184 | * @param string $className The exact class name to look for (this function does not look into parent classes). |
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| 185 | * @param (OutputType&ObjectType)|(OutputType&InterfaceType)|null $subType A subtype (if the main className is an iterator) |
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| 186 | * @return OutputType&Type |
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| 187 | * @throws CannotMapTypeExceptionInterface |
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| 188 | */ |
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| 189 | public function mapClassToInterfaceOrType(string $className, ?OutputType $subType): OutputType |
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| 190 | { |
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| 191 | $closestClassName = $this->findClosestMatchingParent($className); |
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| 192 | if ($closestClassName === null) { |
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| 193 | throw CannotMapTypeException::createForType($className); |
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| 194 | } |
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| 195 | if (!isset($this->interfaces[$closestClassName])) { |
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| 196 | $objectType = $this->mapClassToType($className, $subType); |
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| 197 | |||
| 198 | $supportedClasses = $this->getClassTree(); |
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| 199 | if (isset($supportedClasses[$closestClassName]) && !empty($supportedClasses[$closestClassName]->getChildren())) { |
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| 200 | // Cast as an interface |
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| 201 | $this->interfaces[$closestClassName] = new InterfaceFromObjectType($this->namingStrategy->getInterfaceNameFromConcreteName($objectType->name), $objectType, $subType, $this); |
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| 202 | $this->typeRegistry->registerType($this->interfaces[$closestClassName]); |
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| 203 | } else { |
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| 204 | $this->interfaces[$closestClassName] = $objectType; |
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| 205 | } |
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| 206 | } |
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| 207 | return $this->interfaces[$closestClassName]; |
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| 208 | } |
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| 209 | |||
| 210 | /** |
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| 211 | * Build a map mapping GraphQL interface names to the PHP class name of the object creating this interface. |
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| 212 | * |
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| 213 | * @return array<string, string> |
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| 214 | */ |
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| 215 | private function buildInterfaceToClassNameMap(): array |
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| 216 | { |
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| 217 | $map = []; |
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| 218 | $supportedClasses = $this->getClassTree(); |
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| 219 | foreach ($supportedClasses as $className => $mappedClass) { |
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| 220 | if (!empty($mappedClass->getChildren())) { |
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| 221 | $objectType = $this->mapClassToType($className, null); |
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| 222 | $interfaceName = $this->namingStrategy->getInterfaceNameFromConcreteName($objectType->name); |
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| 223 | $map[$interfaceName] = $className; |
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| 224 | } |
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| 225 | } |
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| 226 | return $map; |
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| 227 | } |
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| 228 | |||
| 229 | /** |
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| 230 | * Returns a map mapping GraphQL interface names to the PHP class name of the object creating this interface. |
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| 231 | * The map may come from the cache. |
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| 232 | * |
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| 233 | * @return array<string, string> |
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| 234 | */ |
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| 235 | private function getInterfaceToClassNameMap(): array |
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| 248 | } |
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| 249 | |||
| 250 | /** |
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| 251 | * Finds the list of interfaces returned by $className. |
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| 252 | * |
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| 253 | * @param string $className |
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| 254 | * @return InterfaceType[] |
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| 255 | */ |
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| 256 | public function findInterfaces(string $className): array |
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| 257 | { |
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| 258 | $interfaces = []; |
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| 259 | while ($className = $this->findClosestMatchingParent($className)) { |
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| 260 | $type = $this->mapClassToInterfaceOrType($className, null); |
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| 261 | if ($type instanceof InterfaceType) { |
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| 262 | $interfaces[] = $type; |
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| 263 | } |
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| 264 | $className = get_parent_class($className); |
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| 265 | if ($className === false) { |
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| 266 | break; |
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| 267 | } |
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| 268 | } |
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| 269 | return $interfaces; |
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| 270 | } |
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| 271 | |||
| 272 | /** |
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| 273 | * @return array<string,MappedClass> |
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| 274 | */ |
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| 275 | private function getClassTree(): array |
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| 276 | { |
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| 277 | if ($this->mappedClasses === null) { |
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| 278 | $supportedClasses = array_flip($this->typeMapper->getSupportedClasses()); |
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| 279 | foreach ($supportedClasses as $supportedClass => $foo) { |
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| 280 | $this->getMappedClass($supportedClass, $supportedClasses); |
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| 281 | } |
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| 282 | } |
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| 283 | return $this->mappedClasses; |
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| 284 | } |
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| 285 | |||
| 286 | /** |
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| 287 | * @param string $className |
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| 288 | * @param array<string,int> $supportedClasses |
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| 289 | * @return MappedClass |
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| 290 | */ |
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| 291 | private function getMappedClass(string $className, array $supportedClasses): MappedClass |
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| 307 | } |
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| 308 | |||
| 309 | /** |
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| 310 | * Returns true if this type mapper can map the $className FQCN to a GraphQL input type. |
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| 311 | * |
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| 312 | * @param string $className |
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| 313 | * @return bool |
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| 314 | */ |
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| 315 | public function canMapClassToInputType(string $className): bool |
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| 318 | } |
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| 319 | |||
| 320 | /** |
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| 321 | * Maps a PHP fully qualified class name to a GraphQL input type. |
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| 322 | * |
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| 323 | * @param string $className |
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| 324 | * @return InputObjectType |
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| 325 | * @throws CannotMapTypeExceptionInterface |
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| 326 | */ |
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| 327 | public function mapClassToInputType(string $className): InputObjectType |
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| 328 | { |
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| 329 | return $this->typeMapper->mapClassToInputType($className, $this); |
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| 330 | } |
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| 331 | |||
| 332 | /** |
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| 333 | * Returns an array containing all OutputTypes. |
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| 334 | * Needed for introspection because of interfaces. |
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| 335 | * |
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| 336 | * @return array<string, OutputType> |
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| 337 | */ |
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| 338 | public function getOutputTypes(): array |
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| 345 | } |
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| 346 | |||
| 347 | /** |
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| 348 | * Returns true if this type mapper can map the $typeName GraphQL name to a GraphQL type. |
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| 349 | * |
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| 350 | * @param string $typeName The name of the GraphQL type |
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| 351 | * @return bool |
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| 352 | */ |
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| 353 | public function canMapNameToType(string $typeName): bool |
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| 354 | { |
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| 355 | $result = $this->typeMapper->canMapNameToType($typeName); |
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| 356 | if ($result === true) { |
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| 357 | return true; |
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| 358 | } |
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| 359 | |||
| 360 | // Maybe the type is an interface? |
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| 361 | $interfaceToClassNameMap = $this->getInterfaceToClassNameMap(); |
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| 362 | if (isset($interfaceToClassNameMap[$typeName])) { |
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| 363 | return true; |
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| 364 | } |
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| 365 | |||
| 366 | return false; |
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| 367 | } |
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| 368 | |||
| 369 | /** |
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| 370 | * Returns a GraphQL type by name (can be either an input or output type) |
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| 371 | * |
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| 372 | * @param string $typeName The name of the GraphQL type |
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| 373 | * @return Type&(InputType|OutputType) |
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| 374 | */ |
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| 375 | public function mapNameToType(string $typeName): Type |
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| 413 | } |
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| 414 | } |
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| 415 |
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