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<?php |
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namespace Wikibase\QueryEngine\SQLStore\DVHandler; |
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use DataValues\DataValue; |
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use DataValues\IriValue; |
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use Doctrine\DBAL\Schema\Table; |
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use Doctrine\DBAL\Types\Type; |
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use InvalidArgumentException; |
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use Wikibase\QueryEngine\SQLStore\DataValueHandler; |
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use Wikibase\QueryEngine\StringHasher; |
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/** |
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* Represents the mapping between IriValue and |
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* the corresponding table in the store. |
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* |
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* @since 0.1 |
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* |
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* @licence GNU GPL v2+ |
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* @author Jeroen De Dauw < [email protected] > |
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*/ |
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class IriHandler extends DataValueHandler { |
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/** |
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* @var StringHasher|null |
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*/ |
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private $stringHasher = null; |
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/** |
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* @see DataValueHandler::getBaseTableName |
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* |
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* @return string |
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*/ |
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protected function getBaseTableName() { |
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return 'iri'; |
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} |
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/** |
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* @see DataValueHandler::completeTable |
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* |
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* @param Table $table |
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*/ |
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protected function completeTable( Table $table ) { |
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// TODO: figure out what the max field lengths should be |
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$table->addColumn( 'value_scheme', Type::STRING, array( 'length' => 255 ) ); |
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$table->addColumn( 'value_hierarchical', Type::STRING, array( 'length' => 255 ) ); |
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$table->addColumn( 'value_query', Type::STRING, array( 'length' => 255 ) ); |
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$table->addColumn( 'value_fragment', Type::STRING, array( 'length' => 255 ) ); |
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$table->addColumn( 'hash', Type::STRING, array( 'length' => StringHasher::LENGTH ) ); |
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// TODO: Is an index on the first 255 bytes/chars of each BLOB/CLOB column possible? |
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$table->addIndex( array( 'hash' ) ); |
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} |
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/** |
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* @see DataValueHandler::getInsertValues |
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* |
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* @param DataValue $value |
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* |
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* @throws InvalidArgumentException |
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* @return string[] |
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*/ |
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public function getInsertValues( DataValue $value ) { |
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if ( !( $value instanceof IriValue ) ) { |
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throw new InvalidArgumentException( 'Value is not a IriValue.' ); |
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} |
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$values = array( |
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'value_scheme' => $value->getScheme(), |
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'value_hierarchical' => $value->getHierarchicalPart(), |
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'value_query' => $value->getQuery(), |
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'value_fragment' => $value->getFragment(), |
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'hash' => $this->getEqualityFieldValue( $value ), |
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); |
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return $values; |
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} |
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/** |
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* @see DataValueHandler::getEqualityFieldValue |
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* |
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* @param DataValue $value |
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* |
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* @throws InvalidArgumentException |
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* @return string |
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*/ |
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public function getEqualityFieldValue( DataValue $value ) { |
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if ( !( $value instanceof IriValue ) ) { |
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throw new InvalidArgumentException( 'Value is not a IriValue.' ); |
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} |
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return $this->hash( $value->getValue() ); |
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} |
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private function hash( $string ) { |
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if ( $this->stringHasher === null ) { |
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$this->stringHasher = new StringHasher(); |
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} |
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return $this->stringHasher->hash( $string ); |
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} |
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} |
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wmde /
WikibaseQueryEngine
