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<?php |
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namespace Wikibase\DataModel\Entity; |
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use Comparable; |
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use InvalidArgumentException; |
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use Serializable; |
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/** |
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* @since 0.5 |
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* Constructor non-public since 1.0 |
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* Abstract since 2.0 |
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* |
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* @license GPL-2.0+ |
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* @author Jeroen De Dauw < [email protected] > |
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*/ |
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abstract class EntityId implements Comparable, Serializable { |
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protected $serialization; |
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const PATTERN = '/^:?(\w+:)*[^:]+\z/'; |
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/** |
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* @param string $serialization |
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*/ |
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public function __construct( $serialization ) { |
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self::assertValidSerialization( $serialization ); |
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$this->serialization = self::normalizeIdSerialization( $serialization ); |
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} |
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private static function assertValidSerialization( $serialization ) { |
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if ( !is_string( $serialization ) ) { |
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throw new InvalidArgumentException( '$serialization must be a string' ); |
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} |
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if ( $serialization === '' ) { |
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throw new InvalidArgumentException( '$serialization must not be an empty string' ); |
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} |
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if ( !preg_match( self::PATTERN, $serialization ) ) { |
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throw new InvalidArgumentException( '$serialization must match ' . self::PATTERN ); |
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} |
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} |
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/** |
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* @return string |
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*/ |
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public abstract function getEntityType(); |
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/** |
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* @return string |
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*/ |
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public function getSerialization() { |
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return $this->serialization; |
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} |
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/** |
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* Returns an array with 3 elements: the foreign repository name as the first element, the local ID as the last |
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* element and everything that is in between as the second element. |
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* |
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* EntityId::joinSerialization can be used to restore the original serialization from the parts returned. |
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* |
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* @param string $serialization |
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* @return string[] Array containing the serialization split into 3 parts. |
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*/ |
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public static function splitSerialization( $serialization ) { |
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self::assertValidSerialization( $serialization ); |
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$parts = explode( ':', self::normalizeIdSerialization( $serialization ) ); |
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$localPart = array_pop( $parts ); |
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$repoName = array_shift( $parts ); |
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$prefixRemainder = implode( ':', $parts ); |
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return array( |
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is_string( $repoName ) ? $repoName : '', |
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$prefixRemainder, |
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$localPart |
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); |
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} |
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/** |
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* Builds an ID serialization from the parts returned by EntityId::splitSerialization. |
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* |
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* @param string[] $parts |
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* @return string |
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* |
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* @throws InvalidArgumentException |
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*/ |
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public static function joinSerialization( array $parts ) { |
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if ( end( $parts ) === '' ) { |
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throw new InvalidArgumentException( 'The last element of $parts must not be empty.' ); |
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} |
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return implode( |
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':', |
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array_filter( $parts, function( $part ) { |
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return $part !== ''; |
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} ) |
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); |
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} |
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/** |
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* Returns '' for local IDs and the foreign repository name for foreign IDs. For chained IDs (e.g. foo:bar:Q42) it |
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* will return only the first part. |
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* |
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* @return string |
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*/ |
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public function getRepoName() { |
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$parts = self::splitSerialization( $this->serialization ); |
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return $parts[0]; |
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} |
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/** |
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* Returns the serialization without the first repository prefix. |
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* |
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* @return string |
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*/ |
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public function getLocalPart() { |
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$parts = self::splitSerialization( $this->serialization ); |
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return self::joinSerialization( array( $parts[1], $parts[2] ) ); |
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} |
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/** |
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* Returns true iff EntityId::getRepoName returns a non-empty string. |
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* |
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* @return bool |
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*/ |
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public function isForeign() { |
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// not actually using EntityId::getRepoName for performance reasons |
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return strpos( $this->serialization, ':' ) > 0; |
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} |
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/** |
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* @param string $id |
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* @return string |
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*/ |
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private static function normalizeIdSerialization( $id ) { |
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return ltrim( $id, ':' ); |
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} |
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/** |
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* This is a human readable representation of the EntityId. |
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* This format is allowed to change and should therefore not |
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* be relied upon to be stable. |
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* |
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* @return string |
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*/ |
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public function __toString() { |
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return $this->serialization; |
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} |
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/** |
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* @see Comparable::equals |
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* |
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* @since 0.5 |
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* |
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* @param mixed $target |
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* |
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* @return bool |
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*/ |
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public function equals( $target ) { |
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if ( $this === $target ) { |
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return true; |
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} |
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return $target instanceof self |
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&& $target->serialization === $this->serialization; |
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} |
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} |
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wmde /
WikibaseDataModel
