thecodingmachine /
graphql-controllers
| Total Complexity | 52 |
| Total Lines | 375 |
| 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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| 27 | class RecursiveTypeMapper implements RecursiveTypeMapperInterface |
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| 28 | { |
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| 29 | /** |
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| 30 | * @var TypeMapperInterface |
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| 31 | */ |
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| 32 | private $typeMapper; |
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| 33 | |||
| 34 | /** |
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| 35 | * An array mapping a class name to the MappedClass instance (useful to know if the class has children) |
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| 36 | * |
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| 37 | * @var array<string,MappedClass>|null |
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| 38 | */ |
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| 39 | private $mappedClasses; |
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| 40 | |||
| 41 | /** |
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| 42 | * An array of interfaces OR object types if no interface matching. |
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| 43 | * |
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| 44 | * @var array<string,OutputType&Type> |
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| 45 | */ |
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| 46 | private $interfaces = []; |
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| 47 | |||
| 48 | /** |
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| 49 | * @var NamingStrategyInterface |
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| 50 | */ |
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| 51 | private $namingStrategy; |
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| 52 | |||
| 53 | /** |
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| 54 | * @var CacheInterface |
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| 55 | */ |
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| 56 | private $cache; |
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| 57 | |||
| 58 | /** |
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| 59 | * @var int|null |
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| 60 | */ |
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| 61 | private $ttl; |
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| 62 | |||
| 63 | /** |
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| 64 | * @var array<string, string> An array mapping a GraphQL interface name to the PHP class name that triggered its generation. |
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| 65 | */ |
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| 66 | private $interfaceToClassNameMap; |
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| 67 | |||
| 68 | /** |
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| 69 | * @var TypeRegistry |
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| 70 | */ |
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| 71 | private $typeRegistry; |
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| 72 | |||
| 73 | |||
| 74 | public function __construct(TypeMapperInterface $typeMapper, NamingStrategyInterface $namingStrategy, CacheInterface $cache, TypeRegistry $typeRegistry, ?int $ttl = null) |
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| 75 | { |
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| 76 | $this->typeMapper = $typeMapper; |
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| 77 | $this->namingStrategy = $namingStrategy; |
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| 78 | $this->cache = $cache; |
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| 79 | $this->ttl = $ttl; |
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| 80 | $this->typeRegistry = $typeRegistry; |
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| 81 | } |
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| 82 | |||
| 83 | /** |
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| 84 | * Returns true if this type mapper can map the $className FQCN to a GraphQL type. |
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| 85 | * |
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| 86 | * @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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| 87 | * @return bool |
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| 88 | */ |
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| 89 | public function canMapClassToType(string $className): bool |
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| 90 | { |
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| 91 | return $this->findClosestMatchingParent($className) !== null; |
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| 92 | } |
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| 93 | |||
| 94 | /** |
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| 95 | * Maps a PHP fully qualified class name to a GraphQL type. |
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| 96 | * |
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| 97 | * @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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| 98 | * @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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| 99 | * @return MutableObjectType |
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| 100 | * @throws CannotMapTypeExceptionInterface |
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| 101 | */ |
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| 102 | public function mapClassToType(string $className, ?OutputType $subType): MutableObjectType |
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| 103 | { |
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| 104 | $closestClassName = $this->findClosestMatchingParent($className); |
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| 105 | if ($closestClassName === null) { |
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| 106 | throw CannotMapTypeException::createForType($className); |
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| 107 | } |
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| 108 | $type = $this->typeMapper->mapClassToType($closestClassName, $subType, $this); |
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| 109 | |||
| 110 | // In the event this type was already part of cache, let's not extend it. |
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| 111 | if ($this->typeRegistry->hasType($type->name)) { |
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| 112 | $cachedType = $this->typeRegistry->getType($type->name); |
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| 113 | if ($cachedType !== $type) { |
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|
introduced
by
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| 114 | throw new \RuntimeException('Cached type in registry is not the type returned by type mapper.'); |
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| 115 | } |
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| 116 | //if ($cachedType->getStatus() === MutableObjectType::STATUS_FROZEN) { |
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| 117 | return $type; |
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| 118 | //} |
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| 119 | } |
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| 120 | |||
| 121 | $this->typeRegistry->registerType($type); |
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| 122 | |||
| 123 | $this->extendType($className, $type); |
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| 124 | |||
| 125 | $type->freeze(); |
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| 126 | |||
| 127 | return $type; |
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| 128 | } |
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| 129 | |||
| 130 | /** |
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| 131 | * Returns the closest parent that can be mapped, or null if nothing can be matched. |
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| 132 | * |
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| 133 | * @param string $className |
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| 134 | * @return string|null |
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| 135 | */ |
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| 136 | private function findClosestMatchingParent(string $className): ?string |
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| 137 | { |
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| 138 | do { |
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| 139 | if ($this->typeMapper->canMapClassToType($className)) { |
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| 140 | return $className; |
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| 141 | } |
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| 142 | } while ($className = get_parent_class($className)); |
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| 143 | return null; |
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| 144 | } |
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| 145 | |||
| 146 | /** |
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| 147 | * Extends a type using available type extenders. |
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| 148 | * |
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| 149 | * @param string $className |
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| 150 | * @param MutableObjectType $type |
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| 151 | * @throws CannotMapTypeExceptionInterface |
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| 152 | */ |
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| 153 | private function extendType(string $className, MutableObjectType $type): void |
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| 154 | { |
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| 155 | $classes = []; |
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| 156 | do { |
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| 157 | if ($this->typeMapper->canExtendTypeForClass($className, $type, $this)) { |
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| 158 | $classes[] = $className; |
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| 159 | } |
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| 160 | } while ($className = get_parent_class($className)); |
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| 161 | |||
| 162 | // Let's apply extenders from the most basic type. |
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| 163 | $classes = array_reverse($classes); |
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| 164 | foreach ($classes as $class) { |
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| 165 | $this->typeMapper->extendTypeForClass($class, $type, $this); |
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| 166 | } |
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| 167 | } |
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| 168 | |||
| 169 | /** |
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| 170 | * Maps a PHP fully qualified class name to a GraphQL type. Returns an interface if possible (if the class |
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| 171 | * has children) or returns an output type otherwise. |
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| 172 | * |
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| 173 | * @param string $className The exact class name to look for (this function does not look into parent classes). |
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| 174 | * @param (OutputType&ObjectType)|(OutputType&InterfaceType)|null $subType A subtype (if the main className is an iterator) |
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| 175 | * @return OutputType&Type |
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| 176 | * @throws CannotMapTypeExceptionInterface |
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| 177 | */ |
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| 178 | public function mapClassToInterfaceOrType(string $className, ?OutputType $subType): OutputType |
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| 179 | { |
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| 180 | $closestClassName = $this->findClosestMatchingParent($className); |
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| 181 | if ($closestClassName === null) { |
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| 182 | throw CannotMapTypeException::createForType($className); |
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| 183 | } |
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| 184 | if (!isset($this->interfaces[$closestClassName])) { |
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| 185 | $objectType = $this->mapClassToType($className, $subType); |
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| 186 | |||
| 187 | $supportedClasses = $this->getClassTree(); |
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| 188 | if (isset($supportedClasses[$closestClassName]) && !empty($supportedClasses[$closestClassName]->getChildren())) { |
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| 189 | // Cast as an interface |
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| 190 | $this->interfaces[$closestClassName] = new InterfaceFromObjectType($this->namingStrategy->getInterfaceNameFromConcreteName($objectType->name), $objectType, $subType, $this); |
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| 191 | $this->typeRegistry->registerType($this->interfaces[$closestClassName]); |
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| 192 | } else { |
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| 193 | $this->interfaces[$closestClassName] = $objectType; |
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| 194 | } |
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| 195 | } |
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| 196 | return $this->interfaces[$closestClassName]; |
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| 197 | } |
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| 198 | |||
| 199 | /** |
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| 200 | * Build a map mapping GraphQL interface names to the PHP class name of the object creating this interface. |
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| 201 | * |
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| 202 | * @return array<string, string> |
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| 203 | */ |
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| 204 | private function buildInterfaceToClassNameMap(): array |
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| 205 | { |
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| 206 | $map = []; |
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| 207 | $supportedClasses = $this->getClassTree(); |
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| 208 | foreach ($supportedClasses as $className => $mappedClass) { |
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| 209 | if (!empty($mappedClass->getChildren())) { |
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| 210 | $objectType = $this->mapClassToType($className, null); |
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| 211 | $interfaceName = $this->namingStrategy->getInterfaceNameFromConcreteName($objectType->name); |
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| 212 | $map[$interfaceName] = $className; |
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| 213 | } |
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| 214 | } |
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| 215 | return $map; |
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| 216 | } |
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| 217 | |||
| 218 | /** |
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| 219 | * Returns a map mapping GraphQL interface names to the PHP class name of the object creating this interface. |
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| 220 | * The map may come from the cache. |
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| 221 | * |
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| 222 | * @return array<string, string> |
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| 223 | */ |
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| 224 | private function getInterfaceToClassNameMap(): array |
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| 237 | } |
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| 238 | |||
| 239 | /** |
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| 240 | * Finds the list of interfaces returned by $className. |
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| 241 | * |
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| 242 | * @param string $className |
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| 243 | * @return InterfaceType[] |
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| 244 | */ |
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| 245 | public function findInterfaces(string $className): array |
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| 246 | { |
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| 247 | $interfaces = []; |
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| 248 | while ($className = $this->findClosestMatchingParent($className)) { |
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| 249 | $type = $this->mapClassToInterfaceOrType($className, null); |
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| 250 | if ($type instanceof InterfaceType) { |
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| 251 | $interfaces[] = $type; |
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| 252 | } |
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| 253 | $className = get_parent_class($className); |
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| 254 | if ($className === false) { |
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| 255 | break; |
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| 256 | } |
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| 257 | } |
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| 258 | return $interfaces; |
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| 259 | } |
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| 260 | |||
| 261 | /** |
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| 262 | * @return array<string,MappedClass> |
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| 263 | */ |
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| 264 | private function getClassTree(): array |
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| 265 | { |
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| 266 | if ($this->mappedClasses === null) { |
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| 267 | $supportedClasses = array_flip($this->typeMapper->getSupportedClasses()); |
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| 268 | foreach ($supportedClasses as $supportedClass => $foo) { |
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| 269 | $this->getMappedClass($supportedClass, $supportedClasses); |
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| 270 | } |
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| 271 | } |
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| 272 | return $this->mappedClasses; |
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| 273 | } |
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| 274 | |||
| 275 | /** |
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| 276 | * @param string $className |
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| 277 | * @param array<string,int> $supportedClasses |
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| 278 | * @return MappedClass |
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| 279 | */ |
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| 280 | private function getMappedClass(string $className, array $supportedClasses): MappedClass |
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| 296 | } |
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| 297 | |||
| 298 | /** |
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| 299 | * Returns true if this type mapper can map the $className FQCN to a GraphQL input type. |
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| 300 | * |
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| 301 | * @param string $className |
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| 302 | * @return bool |
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| 303 | */ |
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| 304 | public function canMapClassToInputType(string $className): bool |
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| 307 | } |
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| 308 | |||
| 309 | /** |
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| 310 | * Maps a PHP fully qualified class name to a GraphQL input type. |
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| 311 | * |
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| 312 | * @param string $className |
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| 313 | * @return InputObjectType |
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| 314 | * @throws CannotMapTypeExceptionInterface |
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| 315 | */ |
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| 316 | public function mapClassToInputType(string $className): InputObjectType |
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| 317 | { |
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| 318 | return $this->typeMapper->mapClassToInputType($className, $this); |
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| 319 | } |
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| 320 | |||
| 321 | /** |
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| 322 | * Returns an array containing all OutputTypes. |
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| 323 | * Needed for introspection because of interfaces. |
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| 324 | * |
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| 325 | * @return array<string, OutputType> |
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| 326 | */ |
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| 327 | public function getOutputTypes(): array |
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| 334 | } |
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| 335 | |||
| 336 | /** |
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| 337 | * Returns true if this type mapper can map the $typeName GraphQL name to a GraphQL type. |
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| 338 | * |
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| 339 | * @param string $typeName The name of the GraphQL type |
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| 340 | * @return bool |
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| 341 | */ |
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| 342 | public function canMapNameToType(string $typeName): bool |
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| 343 | { |
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| 344 | $result = $this->typeMapper->canMapNameToType($typeName); |
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| 345 | if ($result === true) { |
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| 346 | return true; |
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| 347 | } |
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| 348 | |||
| 349 | // Maybe the type is an interface? |
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| 350 | $interfaceToClassNameMap = $this->getInterfaceToClassNameMap(); |
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| 351 | if (isset($interfaceToClassNameMap[$typeName])) { |
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| 352 | return true; |
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| 353 | } |
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| 354 | |||
| 355 | return false; |
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| 356 | } |
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| 357 | |||
| 358 | /** |
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| 359 | * Returns a GraphQL type by name (can be either an input or output type) |
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| 360 | * |
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| 361 | * @param string $typeName The name of the GraphQL type |
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| 362 | * @return Type&(InputType|OutputType) |
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| 363 | */ |
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| 364 | public function mapNameToType(string $typeName): Type |
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| 402 | } |
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| 403 | } |
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| 404 |
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