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<?php |
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namespace Wikibase\DataModel\Statement; |
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use InvalidArgumentException; |
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/** |
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* Everything we know about statement's ranks and what they are supposed to mean. |
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* |
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* @see https://www.mediawiki.org/wiki/Wikibase/DataModel#Ranks_of_Statements |
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* @see https://meta.wikimedia.org/wiki/Wikidata/Data_model_update#Ranks_and_order |
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* |
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* @since 4.4 |
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* |
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* @licence GNU GPL v2+ |
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* @author Thiemo Mättig |
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*/ |
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class StatementRank { |
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/** |
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* Higher values are more preferred. |
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* TODO: Link to discussion/documentation that guarantees increasing order. |
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*/ |
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const DEPRECATED = 0; |
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const NORMAL = 1; |
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const PREFERRED = 2; |
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private static $names = array( |
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self::DEPRECATED => 'deprecated', |
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self::NORMAL => 'normal', |
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self::PREFERRED => 'preferred', |
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); |
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/** |
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* @return string[] Array mapping all known self::... constants (integers) to string names. |
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*/ |
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public static function getNames() { |
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return self::$names; |
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} |
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/** |
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* @return int[] Array mapping string names to all known self::... constants (integers). |
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*/ |
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public static function getAllRanks() { |
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return array_flip( self::$names ); |
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} |
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/** |
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* @param int $rank |
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* |
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* @throws InvalidArgumentException |
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*/ |
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public static function assertIsValid( $rank ) { |
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if ( !self::isValid( $rank ) ) { |
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throw new InvalidArgumentException( 'Invalid rank' ); |
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} |
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} |
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/** |
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* @param int $rank |
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* |
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* @return bool |
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*/ |
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public static function isValid( $rank ) { |
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return is_int( $rank ) && array_key_exists( $rank, self::$names ); |
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} |
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/** |
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* @param int $rank |
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* |
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* @throws InvalidArgumentException |
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* @return bool Statements with a deprecated (or lower) rank are known to be false. But don't be |
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* fooled, this does not mean higher ranks are known to be true! |
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*/ |
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public static function isFalse( $rank ) { |
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self::assertIsValid( $rank ); |
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return $rank === self::DEPRECATED; |
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} |
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/** |
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* @param int|null $rank1 |
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* @param int|null $rank2 |
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* |
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* @throws InvalidArgumentException |
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* @return bool True if the given ranks are equal. |
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*/ |
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public static function isEqual( $rank1, $rank2 ) { |
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return self::compare( $rank1, $rank2 ) === 0; |
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} |
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/** |
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* @param int|null $rank1 |
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* @param int|null $rank2 |
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* |
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* @throws InvalidArgumentException |
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* @return bool True if the first rank is less preferred than the second. |
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*/ |
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public static function isLower( $rank1, $rank2 ) { |
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return self::compare( $rank1, $rank2 ) === -1; |
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} |
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/** |
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* @param int|null $rank1 |
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* @param int|null $rank2 |
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* |
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* @throws InvalidArgumentException |
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* @return bool True if the first rank is more preferred than the second. |
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*/ |
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public static function isHigher( $rank1, $rank2 ) { |
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return self::compare( $rank1, $rank2 ) === 1; |
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} |
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/** |
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* @param int|null $rank1 |
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* @param int|null $rank2 |
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* |
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* @throws InvalidArgumentException |
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* @return int 0 if the ranks are equal, -1 if the first rank is less preferred than the second, |
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* or +1 if the first rank is more preferred than the second. |
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*/ |
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public static function compare( $rank1, $rank2 ) { |
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if ( $rank1 !== null ) { |
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self::assertIsValid( $rank1 ); |
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} |
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if ( $rank2 !== null ) { |
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self::assertIsValid( $rank2 ); |
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} |
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if ( $rank1 === $rank2 ) { |
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return 0; |
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} elseif ( $rank1 === null || $rank1 < $rank2 ) { |
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return -1; |
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} else { |
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return 1; |
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} |
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} |
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/** |
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* @param int[]|int $ranks |
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* @param int [$rank2,...] |
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* |
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* @return int|null Best rank in the array or list of arguments, or null if none given. |
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*/ |
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public static function findBestRank( $ranks = array() /*...*/ ) { |
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if ( !is_array( $ranks ) ) { |
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$ranks = func_get_args(); |
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} |
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$best = null; |
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foreach ( $ranks as $rank ) { |
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if ( self::isHigher( $rank, $best ) ) { |
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$best = $rank; |
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if ( $best === self::PREFERRED ) { |
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break; |
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} |
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} |
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} |
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return $best; |
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} |
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} |
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wmde /
WikibaseDataModel
