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<?php |
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/* |
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* This file is part of the League\Fractal package. |
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* |
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* (c) Phil Sturgeon <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace League\Fractal; |
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use League\Fractal\Resource\Collection; |
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use League\Fractal\Resource\Item; |
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use League\Fractal\Resource\NullResource; |
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use League\Fractal\Resource\ResourceAbstract; |
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/** |
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* Transformer Abstract |
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* |
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* All Transformer classes should extend this to utilize the convenience methods |
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* collection() and item(), and make the self::$availableIncludes property available. |
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* Extend it and add a `transform()` method to transform any default or included data |
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* into a basic array. |
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*/ |
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abstract class TransformerAbstract |
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{ |
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/** |
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* Resources that can be included if requested. |
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* |
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* @var array |
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*/ |
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protected $availableIncludes = []; |
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/** |
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* Include resources without needing it to be requested. |
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* |
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* @var array |
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*/ |
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protected $defaultIncludes = []; |
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/** |
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* The transformer should know about the current scope, so we can fetch relevant params. |
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* |
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* @var Scope |
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*/ |
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protected $currentScope; |
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/** |
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* Getter for availableIncludes. |
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* |
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* @return array |
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*/ |
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public function getAvailableIncludes() |
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{ |
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return $this->availableIncludes; |
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} |
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/** |
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* Getter for defaultIncludes. |
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* |
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* @return array |
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*/ |
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public function getDefaultIncludes() |
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{ |
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return $this->defaultIncludes; |
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} |
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/** |
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* Getter for currentScope. |
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* |
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* @return \League\Fractal\Scope |
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*/ |
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public function getCurrentScope() |
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{ |
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return $this->currentScope; |
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} |
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/** |
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* Figure out which includes we need. |
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* |
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* @internal |
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* |
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* @param Scope $scope |
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* |
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* @return array |
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*/ |
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private function figureOutWhichIncludes(Scope $scope) |
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{ |
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$includes = $this->getDefaultIncludes(); |
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foreach ($this->getAvailableIncludes() as $include) { |
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if ($scope->isRequested($include)) { |
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$includes[] = $include; |
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} |
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} |
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foreach ($includes as $include) { |
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if ($scope->isExcluded($include)) { |
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$includes = array_diff($includes, [$include]); |
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} |
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} |
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return $includes; |
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} |
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/** |
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* This method is fired to loop through available includes, see if any of |
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* them are requested and permitted for this scope. |
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* |
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* @internal |
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* |
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* @param Scope $scope |
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* @param mixed $data |
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* |
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* @return array |
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*/ |
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public function processIncludedResources(Scope $scope, $data) |
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{ |
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$includedData = []; |
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$includes = $this->figureOutWhichIncludes($scope); |
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foreach ($includes as $include) { |
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$includedData = $this->includeResourceIfAvailable( |
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$scope, |
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$data, |
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$includedData, |
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$include |
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); |
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} |
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return $includedData === [] ? false : $includedData; |
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} |
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/** |
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* Include a resource only if it is available on the method. |
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* |
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* @internal |
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* |
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* @param Scope $scope |
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* @param mixed $data |
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* @param array $includedData |
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* @param string $include |
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* |
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* @return array |
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*/ |
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private function includeResourceIfAvailable( |
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Scope $scope, |
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$data, |
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$includedData, |
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$include |
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) { |
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if ($resource = $this->callIncludeMethod($scope, $include, $data)) { |
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$childScope = $scope->embedChildScope($include, $resource); |
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$includedData[$include] = $childScope->toArray(); |
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} |
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return $includedData; |
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} |
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/** |
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* Call Include Method. |
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* |
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* @internal |
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* |
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* @param Scope $scope |
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* @param string $includeName |
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* @param mixed $data |
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* |
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* @throws \Exception |
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* |
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* @return \League\Fractal\Resource\ResourceInterface |
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*/ |
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protected function callIncludeMethod(Scope $scope, $includeName, $data) |
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{ |
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$scopeIdentifier = $scope->getIdentifier($includeName); |
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$params = $scope->getManager()->getIncludeParams($scopeIdentifier); |
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// Check if the method name actually exists |
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$methodName = 'include'.str_replace(' ', '', ucwords(str_replace('_', ' ', str_replace('-', ' ', $includeName)))); |
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$resource = call_user_func([$this, $methodName], $data, $params); |
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if ($resource === null) { |
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return false; |
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} |
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if (! $resource instanceof ResourceAbstract) { |
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throw new \Exception(sprintf( |
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'Invalid return value from %s::%s(). Expected %s, received %s.', |
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__CLASS__, |
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$methodName, |
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'League\Fractal\Resource\ResourceAbstract', |
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gettype($resource) |
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)); |
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} |
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return $resource; |
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} |
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/** |
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* Setter for availableIncludes. |
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* |
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* @param array $availableIncludes |
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* |
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* @return $this |
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*/ |
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public function setAvailableIncludes($availableIncludes) |
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{ |
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$this->availableIncludes = $availableIncludes; |
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return $this; |
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} |
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/** |
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* Setter for defaultIncludes. |
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* |
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* @param array $defaultIncludes |
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* |
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* @return $this |
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*/ |
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public function setDefaultIncludes($defaultIncludes) |
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{ |
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$this->defaultIncludes = $defaultIncludes; |
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return $this; |
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} |
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/** |
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* Setter for currentScope. |
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* |
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* @param Scope $currentScope |
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* |
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* @return $this |
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*/ |
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public function setCurrentScope($currentScope) |
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{ |
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$this->currentScope = $currentScope; |
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return $this; |
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} |
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/** |
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* Create a new item resource object. |
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* |
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* @param mixed $data |
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* @param TransformerAbstract|callable $transformer |
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* @param string $resourceKey |
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* |
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* @return Item |
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*/ |
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protected function item($data, $transformer, $resourceKey = null) |
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{ |
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return new Item($data, $transformer, $resourceKey); |
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} |
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/** |
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* Create a new collection resource object. |
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* |
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* @param mixed $data |
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* @param TransformerAbstract|callable $transformer |
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* @param string $resourceKey |
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* |
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* @return Collection |
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*/ |
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protected function collection($data, $transformer, $resourceKey = null) |
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{ |
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return new Collection($data, $transformer, $resourceKey); |
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} |
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/** |
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* Create a new null resource object. |
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* |
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* @return NullResource |
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*/ |
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protected function null() |
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{ |
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return new NullResource(); |
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} |
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} |
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