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<?php |
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namespace AlgoWeb\PODataLaravel\Providers; |
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use Illuminate\Support\Facades\App; |
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use Illuminate\Support\ServiceProvider; |
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use Illuminate\Support\Facades\Cache; |
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use POData\Providers\Metadata\IMetadataProvider; |
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use POData\Providers\Metadata\ResourceType; |
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use POData\Providers\Metadata\SimpleMetadataProvider; |
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use Illuminate\Support\Facades\Route; |
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use Illuminate\Support\Facades\Schema as Schema; |
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class MetadataProvider extends MetadataBaseProvider |
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{ |
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protected $multConstraints = [ '0..1' => ['1'], '1' => ['0..1', '*'], '*' => ['1', '*']]; |
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protected static $METANAMESPACE = "Data"; |
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/** |
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* Bootstrap the application services. Post-boot. |
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* |
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* @return void |
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*/ |
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public function boot() |
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{ |
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self::$METANAMESPACE = env('ODataMetaNamespace', 'Data'); |
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// If we aren't migrated, there's no DB tables to pull metadata _from_, so bail out early |
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try { |
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if (!Schema::hasTable('migrations')) { |
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return; |
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} |
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} catch (\Exception $e) { |
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return; |
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} |
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self::setupRoute(); |
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$isCaching = true === $this->getIsCaching(); |
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$hasCache = Cache::has('metadata'); |
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if ($isCaching && $hasCache) { |
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$meta = Cache::get('metadata'); |
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App::instance('metadata', $meta); |
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return; |
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} |
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$meta = App::make('metadata'); |
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$modelNames = $this->getCandidateModels(); |
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list($EntityTypes, $ResourceSets, $ends) = $this->getEntityTypesAndResourceSets($meta, $modelNames); |
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// need to lift EntityTypes |
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$biDirect = $this->calculateRoundTripRelations(); |
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// now that endpoints are hooked up, tackle the relationships |
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// if we'd tried earlier, we'd be guaranteed to try to hook a relation up to null, which would be bad |
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foreach ($biDirect as $line) { |
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$principalType = $line['principalType']; |
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$principalMult = $line['principalMult']; |
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$principalProp = $line['principalProp']; |
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$dependentType = $line['dependentType']; |
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$dependentMult = $line['dependentMult']; |
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$dependentProp = $line['dependentProp']; |
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if (!isset($EntityTypes[$principalType]) || !isset($EntityTypes[$dependentType])) { |
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continue; |
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} |
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$principal = $EntityTypes[$principalType]; |
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$dependent = $EntityTypes[$dependentType]; |
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//many-to-many |
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if ('*' == $principalMult && '*' == $dependentMult) { |
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$meta->addResourceSetReferencePropertyBidirectional( |
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$principal, |
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$dependent, |
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$principalProp, |
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$dependentProp |
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); |
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continue; |
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} |
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//one-to-one |
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if ('0..1' == $principalMult || '0..1' == $dependentMult) { |
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$meta->addResourceReferenceSinglePropertyBidirectional( |
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$principal, |
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$dependent, |
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$principalProp, |
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$dependentProp |
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); |
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continue; |
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} |
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//one-to-many |
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$meta->addResourceReferencePropertyBidirectional( |
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$principal, |
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$dependent, |
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$principalProp, |
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$dependentProp |
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); |
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} |
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$key = 'metadata'; |
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$this->handlePostBoot($isCaching, $hasCache, $key, $meta); |
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} |
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private static function setupRoute() |
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{ |
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$valueArray = []; |
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Route::any('odata.svc/{section}', 'AlgoWeb\PODataLaravel\Controllers\ODataController@index') |
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->where(['section' => '.*']); |
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Route::any('odata.svc', 'AlgoWeb\PODataLaravel\Controllers\ODataController@index'); |
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} |
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/** |
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* Register the application services. Boot-time only. |
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* |
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* @return void |
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*/ |
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public function register() |
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{ |
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$this->app->singleton('metadata', function ($app) { |
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return new SimpleMetadataProvider('Data', self::$METANAMESPACE); |
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}); |
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} |
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/** |
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* @return array |
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*/ |
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protected function getCandidateModels() |
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{ |
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$Classes = $this->getClassMap(); |
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$ends = []; |
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$startName = defined('PODATA_LARAVEL_APP_ROOT_NAMESPACE') ? PODATA_LARAVEL_APP_ROOT_NAMESPACE : "App"; |
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foreach ($Classes as $name) { |
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if (\Illuminate\Support\Str::startsWith($name, $startName)) { |
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if (in_array("AlgoWeb\\PODataLaravel\\Models\\MetadataTrait", class_uses($name))) { |
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$ends[] = $name; |
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} |
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} |
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} |
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return $ends; |
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} |
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/** |
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* @param $meta |
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* @param $ends |
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* @return array |
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*/ |
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protected function getEntityTypesAndResourceSets($meta, $ends) |
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{ |
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assert($meta instanceof IMetadataProvider, get_class($meta)); |
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$EntityTypes = []; |
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$ResourceSets = []; |
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$begins = []; |
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$numEnds = count($ends); |
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for ($i = 0; $i < $numEnds; $i++) { |
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$bitter = $ends[$i]; |
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$fqModelName = $bitter; |
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$instance = App::make($fqModelName); |
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$name = strtolower($instance->getEndpointName()); |
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$metaSchema = $instance->getXmlSchema(); |
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// if for whatever reason we don't get an XML schema, move on to next entry and drop current one from |
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// further processing |
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if (null == $metaSchema) { |
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continue; |
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} |
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$EntityTypes[$fqModelName] = $metaSchema; |
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$ResourceSets[$fqModelName] = $meta->addResourceSet($name, $metaSchema); |
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$begins[] = $bitter; |
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} |
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return array($EntityTypes, $ResourceSets, $begins); |
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} |
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public function calculateRoundTripRelations() |
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{ |
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$modelNames = $this->getCandidateModels(); |
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$hooks = []; |
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foreach ($modelNames as $name) { |
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$model = new $name(); |
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$rels = $model->getRelationships(); |
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// it doesn't matter if a model has no relationships here, that lack will simply be skipped over |
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// during hookup processing |
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$hooks[$name] = $rels; |
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} |
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// model relation gubbins are assembled, now the hard bit starts |
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// storing assembled bidirectional relationship schema |
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$rawLines = []; |
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// storing unprocessed relation gubbins for second-pass processing |
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$remix = []; |
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$this->calculateRoundTripRelationsFirstPass($hooks, $rawLines, $remix); |
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// now for second processing pass, to pick up stuff that first didn't handle |
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$rawLines = $this->calculateRoundTripRelationsSecondPass($remix, $rawLines); |
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// deduplicate rawLines - can't use array_unique as array value elements are themselves arrays |
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$lines = []; |
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foreach ($rawLines as $line) { |
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if (!in_array($line, $lines)) { |
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$lines[] = $line; |
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} |
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} |
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return $lines; |
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} |
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/** |
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* @param $remix |
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* @param $lines |
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* @return array |
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*/ |
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private function calculateRoundTripRelationsSecondPass($remix, $lines) |
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{ |
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foreach ($remix as $principalType => $value) { |
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foreach ($value as $fk => $localRels) { |
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foreach ($localRels as $dependentType => $deets) { |
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$principalMult = $deets['multiplicity']; |
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$principalProperty = $deets['property']; |
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$principalKey = $deets['local']; |
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if (!isset($remix[$dependentType])) { |
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continue; |
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} |
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$foreign = $remix[$dependentType]; |
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if (!isset($foreign[$principalKey])) { |
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continue; |
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} |
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$foreign = $foreign[$principalKey]; |
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$dependentKey = $foreign[$dependentType]['local']; |
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if ($fk != $dependentKey) { |
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continue; |
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} |
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$dependentMult = $foreign[$dependentType]['multiplicity']; |
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$dependentProperty = $foreign[$dependentType]['property']; |
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assert( |
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in_array($dependentMult, $this->multConstraints[$principalMult]), |
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"Cannot pair multiplicities " . $dependentMult . " and " . $principalMult |
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); |
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assert( |
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in_array($principalMult, $this->multConstraints[$dependentMult]), |
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"Cannot pair multiplicities " . $principalMult . " and " . $dependentMult |
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); |
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// generate forward and reverse relations |
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list($forward, $reverse) = $this->calculateRoundTripRelationsGenForwardReverse( |
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$principalType, |
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$principalMult, |
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$principalProperty, |
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$dependentType, |
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$dependentMult, |
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$dependentProperty |
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); |
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// add forward relation |
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$lines[] = $forward; |
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// add reverse relation |
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$lines[] = $reverse; |
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} |
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} |
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} |
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return $lines; |
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} |
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/** |
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* @param $hooks |
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* @param $lines |
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* @param $remix |
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*/ |
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private function calculateRoundTripRelationsFirstPass($hooks, &$lines, &$remix) |
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{ |
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foreach ($hooks as $principalType => $value) { |
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foreach ($value as $fk => $localRels) { |
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foreach ($localRels as $dependentType => $deets) { |
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if (!isset($hooks[$dependentType])) { |
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continue; |
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} |
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$principalMult = $deets['multiplicity']; |
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$principalProperty = $deets['property']; |
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$principalKey = $deets['local']; |
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$foreign = $hooks[$dependentType]; |
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$foreign = null != $foreign && isset($foreign[$principalKey]) ? $foreign[$principalKey] : null; |
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if (null != $foreign && isset($foreign[$principalType])) { |
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$foreign = $foreign[$principalType]; |
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$dependentMult = $foreign['multiplicity']; |
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$dependentProperty = $foreign['property']; |
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assert( |
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in_array($dependentMult, $this->multConstraints[$principalMult]), |
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"Cannot pair multiplicities " . $dependentMult . " and " . $principalMult |
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); |
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assert( |
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in_array($principalMult, $this->multConstraints[$dependentMult]), |
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"Cannot pair multiplicities " . $principalMult . " and " . $dependentMult |
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); |
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// generate forward and reverse relations |
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list($forward, $reverse) = $this->calculateRoundTripRelationsGenForwardReverse( |
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$principalType, |
298
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$principalMult, |
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$principalProperty, |
300
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$dependentType, |
301
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$dependentMult, |
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$dependentProperty |
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); |
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// add forward relation |
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$lines[] = $forward; |
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// add reverse relation |
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$lines[] = $reverse; |
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} else { |
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if (!isset($remix[$principalType])) { |
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$remix[$principalType] = []; |
311
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} |
312
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if (!isset($remix[$principalType][$fk])) { |
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$remix[$principalType][$fk] = []; |
314
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} |
315
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if (!isset($remix[$principalType][$fk][$dependentType])) { |
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$remix[$principalType][$fk][$dependentType] = $deets; |
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} |
318
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assert(isset($remix[$principalType][$fk][$dependentType])); |
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} |
320
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} |
321
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} |
322
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} |
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} |
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325
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/** |
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* @param $principalType |
327
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* @param $principalMult |
328
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* @param $principalProperty |
329
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* @param $dependentType |
330
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* @param $dependentMult |
331
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* @param $dependentProperty |
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* @return array |
333
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*/ |
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private function calculateRoundTripRelationsGenForwardReverse( |
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$principalType, |
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$principalMult, |
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$principalProperty, |
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$dependentType, |
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$dependentMult, |
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$dependentProperty |
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) { |
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$forward = [ |
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'principalType' => $principalType, |
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'principalMult' => $principalMult, |
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'principalProp' => $principalProperty, |
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'dependentType' => $dependentType, |
347
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'dependentMult' => $dependentMult, |
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'dependentProp' => $dependentProperty |
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]; |
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$reverse = [ |
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'principalType' => $dependentType, |
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'principalMult' => $dependentMult, |
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'principalProp' => $dependentProperty, |
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'dependentType' => $principalType, |
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'dependentMult' => $principalMult, |
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'dependentProp' => $principalProperty |
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]; |
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return array($forward, $reverse); |
359
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} |
360
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} |
361
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This check marks calls to methods that do not seem to exist on an object.
This is most likely the result of a method being renamed without all references to it being renamed likewise.