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<?php |
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/** |
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* A collection of semantic properties and changes changes made to them. |
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* This class is based on SMWSemanticData and can be seen as a simplified |
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* version with SWLPropertyChange objects, each holding 2 SMWDataItem objects, |
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* instead of SMWDataItem objects. |
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* |
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* @since 0.1 |
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* |
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* @file SWL_PropertyChange.php |
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* @ingroup SemanticWatchlist |
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* |
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* @licence GNU GPL v3 or later |
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* @author Jeroen De Dauw < [email protected] > |
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*/ |
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class SWLPropertyChanges implements Iterator { |
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private $pos = 0; |
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private $currentRow = null; |
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/** |
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* Cache for the localized version of the namespace prefix "Property:". |
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* |
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* @var string |
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*/ |
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static private $propertyPrefix = ''; |
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/** |
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* Array mapping property keys (string) to arrays of SWLPropertyChange. |
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* |
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* @var array of SWLPropertyChange |
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*/ |
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private $changes = array(); |
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/** |
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* Array mapping property keys (string) to SMWDIProperty objects. |
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* |
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* @var array of SMWDIProperty |
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*/ |
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private $properties = array(); |
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/** |
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* Indicates if there are changes in the list. |
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* |
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* @var boolean |
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*/ |
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private $hasChanges = false; |
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/** |
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* Get the array of all properties that have changes. |
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* |
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* @return array of SMWDIProperty |
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*/ |
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public function getProperties() { |
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return $this->properties; |
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} |
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/** |
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* Returns if the list contains any changes. |
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* This info is cached, so the call is cheaper then doing a count. |
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* |
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* @return boolean |
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*/ |
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public function hasChanges() { |
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return $this->hasChanges; |
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} |
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/** |
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* Get the array of all stored values for some property. |
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* |
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* @param $property SMWDIProperty |
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* |
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* @return array of SWLPropertyChange |
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*/ |
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public function getPropertyChanges( SMWDIProperty $property ) { |
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if ( array_key_exists( $property->getKey(), $this->changes ) ) { |
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return $this->changes[$property->getKey()]; |
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} else { |
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return array(); |
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} |
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} |
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/** |
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* Store a value for a property identified by its SMWDataItem object. |
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* |
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* @note There is no check whether the type of the given data item |
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* agrees with the type of the property. Since property types can |
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* change, all parts of SMW are prepared to handle mismatched data item |
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* types anyway. |
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* |
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* @param SMWDIProperty $property |
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* @param SWLPropertyChange $change |
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*/ |
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public function addPropertyObjectChange( SMWDIProperty $property, SWLPropertyChange $change ) { |
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if ( $property->isInverse() ) { // inverse properties cannot be used for annotation |
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return; |
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} |
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if ( !array_key_exists( $property->getKey(), $this->changes ) ) { |
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$this->changes[$property->getKey()] = array(); |
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$this->properties[$property->getKey()] = $property; |
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} |
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$this->changes[$property->getKey()][] = $change; |
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$this->hasChanges = true; |
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} |
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/** |
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* Store a value for a given property identified by its text label |
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* (without namespace prefix). |
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* |
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* @param string $propertyName |
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* @param SWLPropertyChange $change |
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*/ |
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public function addPropertyChange( $propertyName, SWLPropertyChange $change ) { |
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$propertyKey = smwfNormalTitleDBKey( $propertyName ); |
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if ( array_key_exists( $propertyKey, $this->properties ) ) { |
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$property = $this->properties[$propertyKey]; |
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} else { |
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if ( self::$propertyPrefix == '' ) { |
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global $wgContLang; |
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self::$propertyPrefix = $wgContLang->getNsText( SMW_NS_PROPERTY ) . ':'; |
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} // explicitly use prefix to cope with things like [[Property:User:Stupid::somevalue]] |
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$propertyDV = SMWPropertyValue::makeUserProperty( self::$propertyPrefix . $propertyName ); |
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if ( !$propertyDV->isValid() ) { // error, maybe illegal title text |
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return; |
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} |
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$property = $propertyDV->getDataItem(); |
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} |
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$this->addPropertyObjectChange( $property, $change ); |
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} |
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/** |
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* Removes all changes for a certian property. |
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* |
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* @param SMWDIProperty $property |
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*/ |
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public function removeChangesForProperty( SMWDIProperty $property ) { |
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if ( array_key_exists( $property->getKey(), $this->changes ) ) { |
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unset( $this->changes[$property->getKey()] ); |
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unset( $this->properties[$property->getKey()] ); |
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} |
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} |
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function rewind() { |
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$this->pos = 0; |
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$this->currentRow = null; |
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} |
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function current() { |
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if ( is_null( $this->currentRow ) ) { |
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$this->next(); |
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} |
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return $this->currentRow; |
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} |
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function key() { |
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return $this->pos; |
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} |
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function next() { |
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$this->pos++; |
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$this->currentRow = array_key_exists( $this->pos, $this->changes ) ? $this->changes[$this->pos] : false; |
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return $this->currentRow; |
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} |
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function valid() { |
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return $this->current() !== false; |
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} |
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} |
SemanticMediaWiki /
SemanticWatchlist
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Adding explicit visibility (
private,protected, orpublic) is generally recommend to communicate to other developers how, and from where this method is intended to be used.