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<?php |
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namespace POData\UriProcessor; |
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use POData\Common\InvalidOperationException; |
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use POData\Providers\Metadata\ResourceSetWrapper; |
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class SegmentStack |
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{ |
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/** |
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* Collection of segment names. |
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* |
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* @var string[] |
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*/ |
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private $segmentNames; |
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/** |
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* Collection of segment ResourceSetWrapper instances. |
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* |
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* @var ResourceSetWrapper[] |
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*/ |
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private $segmentResourceSetWrappers; |
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/** |
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* Description of the OData request that a client has submitted. |
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* |
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* @var RequestDescription |
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*/ |
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private $request; |
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private $mismatch = "Mismatch between size of names array and wrappers array"; |
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public function __construct(RequestDescription $request) |
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{ |
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$this->request = $request; |
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$this->segmentNames = []; |
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$this->segmentResourceSetWrappers = []; |
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assert(count($this->segmentNames) == count($this->segmentResourceSetWrappers), $this->mismatch); |
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} |
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/** |
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* Pushes information about the segment whose instance is going to be |
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* retrieved from the IDSQP implementation |
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* Note: Calls to this method should be balanced with calls to popSegment. |
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* |
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* @param string $segmentName Name of segment to push |
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* @param ResourceSetWrapper &$resourceSetWrapper The resource set wrapper |
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* to push |
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* |
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* @return bool true if the segment was push, false otherwise |
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*/ |
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public function pushSegment($segmentName, ResourceSetWrapper &$resourceSetWrapper) |
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{ |
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$rootProjectionNode = $this->getRequest()->getRootProjectionNode(); |
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if (!is_null($rootProjectionNode) && $rootProjectionNode->isExpansionSpecified()) { |
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array_push($this->segmentNames, $segmentName); |
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array_push($this->segmentResourceSetWrappers, $resourceSetWrapper); |
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assert(count($this->segmentNames) == count($this->segmentResourceSetWrappers), $this->mismatch); |
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return true; |
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} |
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return false; |
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} |
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/** |
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* Pops segment information from the 'Segment Stack' |
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* Note: Calls to this method should be balanced with previous calls |
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* to _pushSegment. |
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* |
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* @param bool $needPop Is a pop required. Only true if last push |
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* was successful |
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* |
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* @throws InvalidOperationException If found un-balanced call |
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* with _pushSegment |
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*/ |
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public function popSegment($needPop) |
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{ |
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if ($needPop) { |
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if (!empty($this->segmentNames)) { |
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array_pop($this->segmentNames); |
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array_pop($this->segmentResourceSetWrappers); |
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assert(count($this->segmentNames) == count($this->segmentResourceSetWrappers), $this->mismatch); |
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} else { |
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throw new InvalidOperationException( |
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'Found non-balanced call to pushSegment and popSegment' |
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); |
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} |
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} |
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} |
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/** |
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* Retrieve stored segment names |
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* |
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* @return \string[] |
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*/ |
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public function getSegmentNames() |
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{ |
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return $this->segmentNames; |
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} |
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/** |
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* Retrieve stored segment wrappers |
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* |
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* @return ResourceSetWrapper[] |
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*/ |
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public function getSegmentWrappers() |
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{ |
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return $this->segmentResourceSetWrappers; |
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} |
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/** |
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* Gets reference to the request submitted by client. |
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* |
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* @return RequestDescription |
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*/ |
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public function getRequest() |
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{ |
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return $this->request; |
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} |
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} |
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Algo-Web /
POData
