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<?php |
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namespace BOTK; |
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use BOTK\Exception\FactsValidatorWarning; |
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use BOTK\Exception\InvalidRawDataWarning; |
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use BOTK\Exception\TooManyErrorsException; |
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use BOTK\Exception\TooManyInsanesException; |
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/** |
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* Create structured data from an array of raw data (i.e. ie just a sequence of scalars) managing errors. |
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* The class provides a RDF triple counter and tresholds for data processinge errors |
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* Options: |
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* 'datamapper' a callable that accepts a raw data array and create structured data as an array. Must be provided. |
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* 'rawdataSanitizer a callable that validate raw data before datamapper. It returns an array of raw data of false if rawdata is invalid. |
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* 'dataCleaner' a callable that filters the structured data returned by datamapper before to instanciate data model, |
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* by default it removes all empty properties. |
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* 'factsErrorDetector' a callable that validate computed facts. It accepts a ModelInterface and returns an error description or false. |
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* By defaults accepted raw data that produces empty facts are considered errors. |
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*/ |
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class FactsFactory implements FactsFactoryInterface { |
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protected $profile; |
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protected $modelClass; |
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protected $counter = array( |
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'triple' => 0, // rdf triples in facts |
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'error' => 0, // facts contains error |
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'insane' => 0, // raw data unaccepted |
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'entity' => 0, // raw data processed |
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); |
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public function __construct( array $profile =array() ) |
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{ |
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$defaults = array( |
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'model' => 'LocalBusiness', |
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'modelOptions' => array(), |
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'entityThreshold' => 100, // min numbers of entity that trigger error resilence computation. |
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'resilienceToErrors' => 0.3, // if more than 30% of error throws a TooManyErrorException |
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'resilienceToInsanes' => 0.9, // if more than 90% of unacceptable data throws a TooManyErrorException |
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'source' => null, |
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'datamapper' => function($rawdata){return $rawdata;}, |
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'dataCleaner' => get_class().'::REMOVE_EMPTY', |
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'factsErrorDetector' => get_class().'::NOT_EMPTY_FACTS', |
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'rawdataSanitizer' => function($rawdata){return is_array($rawdata)?$rawdata:false;}, |
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); |
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$this->profile = array_merge($defaults,$profile); |
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$this->modelClass = class_exists($this->profile['model']) |
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?$this->profile['model'] |
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:('\BOTK\Model\\'.$this->profile['model']); |
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if( !class_exists($this->modelClass) || !is_subclass_of($this->modelClass, '\BOTK\ModelInterface')){ |
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throw new \InvalidArgumentException("The provided model ({$this->profile['model']} is unknown"); |
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} |
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if( !is_callable($this->profile['datamapper'])) { |
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throw new \InvalidArgumentException("Invalid datamapper callback"); |
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} |
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if( !is_callable($this->profile['dataCleaner'])) { |
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throw new \InvalidArgumentException("Invalid dataCleaner callback"); |
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} |
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if( !is_callable($this->profile['rawdataSanitizer'])) { |
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throw new \InvalidArgumentException("Invalid rawdataSanitizer callback"); |
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} |
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if( !is_callable($this->profile['factsErrorDetector'])) { |
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throw new \InvalidArgumentException("Invalid factsErrorDetector callback"); |
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} |
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} |
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/** |
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* two level filter array, a default for dataCleaner callback |
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*/ |
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public static function REMOVE_EMPTY( array $data) |
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{ |
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$a = array(); |
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foreach ($data as $key => $value) { |
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$a[$key] = is_array($value)?array_filter($value):$value; |
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} |
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return array_filter($a); |
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} |
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/** |
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* a default for dataValidator callback |
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*/ |
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public static function NOT_EMPTY_FACTS( \BOTK\ModelInterface $data) |
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{ |
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return $data->getTripleCount()?false:'No facts found.'; |
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} |
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/** |
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* create facts from rawdata. Please nothe that null facts does not means always an error (i.e. no facts is a fact). |
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* if you do not want empty facts use dataValidator |
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*/ |
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public function factualize($rawData) |
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{ |
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$rawdataSanitizer = $this->profile['rawdataSanitizer']; |
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$validRawData = $rawdataSanitizer($rawData); |
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if (!empty($validRawData)){ |
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$this->counter['entity']++; |
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$datamapper = $this->profile['datamapper']; |
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$dataCleaner = $this->profile['dataCleaner']; |
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$factsErrorDetector = $this->profile['factsErrorDetector']; |
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$data =$dataCleaner($datamapper($validRawData)); |
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$facts = call_user_func($this->modelClass.'::fromArray',$data,$this->profile['modelOptions']); |
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$this->counter['triple'] += $facts->getTripleCount(); |
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if(!$error=$factsErrorDetector($facts)){ |
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} else { |
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$this->counter['error']++; |
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throw new FactsValidatorWarning($error,$facts); |
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} |
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} else { |
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$this->counter['insane']++; |
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throw new InvalidRawDataWarning("Invalid rawdata",$rawData); |
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} |
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// ensure that not too many errors |
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$errorRate = $this->counter['error']/$this->counter['entity']; |
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if(( $this->counter['entity'] > $this->profile['entityThreshold']) |
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&& ( $errorRate > $this->profile['resilienceToErrors'])){ |
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$x = $this->profile['resilienceToErrors']*100; |
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throw new TooManyErrorsException("Error rate in data processing exceeded the $x% threshold"); |
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} |
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// ensure that not too many insaness raw data |
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$insaneRate = $this->counter['insane']/$this->counter['entity']; |
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if(( $this->counter['entity'] > $this->profile['entityThreshold']) |
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&& ($insaneRate > $this->profile['resilienceToInsanes'])){ |
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$x = $this->profile['resilienceToInsanes']*100; |
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throw new TooManyInsanesException("Unacceptable data rate exceeded the $x% threshold"); |
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} |
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return $facts; |
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} |
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public function generateLinkedDataHeader() |
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{ |
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return call_user_func($this->modelClass.'::getTurtleHeader'); |
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} |
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public function generateLinkedDataFooter() |
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{ |
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$now = date('c'); |
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$rdf = "\n<> "; |
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$this->counter['triple'] += 6; |
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// add provenance info |
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$rdf .= "prov:generatedAtTime \"$now\"^^xsd:dateTime;"; |
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if(!empty($this->profile['source'])){ |
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$rdf.= "dct:source <{$this->profile['source']}>;"; |
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$this->counter['triple']++; |
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} |
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// add dataset info and a human readable comment as last line |
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$rdf.= "foaf:primaryTopic <#dataset>.\n"; |
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$rdf.= "<#dataset> a void:Dataset; void:datadump <>;void:triples {$this->counter['triple']} ;void:entities {$this->counter['entity']}.\n"; |
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$rdf.= "# Generated {$this->counter['triple']} good triples from {$this->counter['entity']} entities ({$this->counter['insane']} ignored), {$this->counter['error']} errors\n"; |
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return $rdf; |
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} |
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public function addToCounter($counter,$val=1) |
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{ |
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if(!array_key_exists($counter,$this->counter)){ |
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throw new \InvalidArgumentException("Invalid counter name"); |
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} |
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$this->counter[$counter]+= intval($val); |
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} |
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public function getCounters() |
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{ |
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return $this->counter; |
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} |
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} |
linkeddatacenter /
BOTK-core
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