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<?php
namespace SMW\Query\Language;
use SMW\DIProperty;
/**
* Description of a set of instances that have an attribute with some value
* that fits another (sub)description.
*
* Corresponds to existential quantification ("SomeValuesFrom" restriction) on
* properties in OWL. In conjunctive queries (OWL) and SPARQL (RDF), it is
* represented by using variables in the object part of such properties.
*
* @license GNU GPL v2+
* @since 1.6
*
* @author Markus Krötzsch
*/
class SomeProperty extends Description {
/**
* @var Description
*/
protected $description;
/**
* @var DIProperty
*/
protected $property;
/**
* @var integer|null
*/
protected $hierarchyDepth;
/**
* @since 1.6
*
* @param DIProperty $property
* @param Description $description
*/
public function __construct( DIProperty $property, Description $description ) {
$this->property = $property;
$this->description = $description;
}
/**
* @since 3.0
*
* @param integer $hierarchyDepth
*/
public function setHierarchyDepth( $hierarchyDepth ) {
if ( $hierarchyDepth > $GLOBALS['smwgQSubpropertyDepth'] ) {
$hierarchyDepth = $GLOBALS['smwgQSubpropertyDepth'];
}
$this->hierarchyDepth = $hierarchyDepth;
}
/**
* @since 3.0
*
* @return integer|null
*/
public function getHierarchyDepth() {
return $this->hierarchyDepth;
}
/**
* @see Description::getFingerprint
* @since 2.5
*
* @return string
*/
public function getFingerprint() {
// Avoid a recursive tree
if ( $this->fingerprint !== null ) {
return $this->fingerprint;
}
$subDescription = $this->description;
$property = $this->property->getSerialization();
// Resolve property.chains and connect its members
while ( $subDescription instanceof SomeProperty ) {
$subDescription = $subDescription->getDescription();
$subDescription->setMembership( $property );
}
// During a recursive chain use the hash from a stored
// member to distinguish Foo.Bar.Foobar.Bam from Foo.Bar.Foobar
$membership = $this->getMembership() . $subDescription->getMembership();
return $this->fingerprint = 'S:' . md5( $property . '|' . $membership . '|' . $this->description->getFingerprint() . $this->hierarchyDepth );
}
/**
* @return DIProperty
*/
public function getProperty() {
return $this->property;
}
/**
* @since 1.6
*
* @return Description
*/
public function getDescription() {
return $this->description;
}
/**
* @since 1.6
*
* @return string
*/
public function getQueryString( $asValue = false ) {
$subDescription = $this->description;
// Use the canonical label to ensure that conditions contain
// language indep. references
$propertyChainString = $this->property->getCanonicalLabel();
$propertyname = $propertyChainString;
$final = '';
while ( ( $propertyname !== '' ) && ( $subDescription instanceof SomeProperty ) ) { // try to use property chain syntax
$propertyname = $subDescription->getProperty()->getCanonicalLabel();
if ( $propertyname !== '' ) {
$propertyChainString .= '.' . $propertyname;
$subDescription = $subDescription->getDescription();
}
}
if ( $this->hierarchyDepth !== null ) {
$final = '|+depth=' . $this->hierarchyDepth;
}
if ( $asValue ) {
return '<q>[[' . $propertyChainString . '::' . $subDescription->getQueryString( true ) . $final . ']]</q>';
}
return '[[' . $propertyChainString . '::' . $subDescription->getQueryString( true ) . $final . ']]';
}
/**
* @since 1.6
*
* @return boolean
*/
public function isSingleton() {
return false;
}
/**
* @since 1.6
*
* @return integer
*/
public function getSize() {
return 1 + $this->getDescription()->getSize();
}
/**
* @since 1.6
*
* @return integer
*/
public function getDepth() {
return 1 + $this->getDescription()->getDepth();
}
/**
* @since 1.6
*
* @return integer
*/
public function getQueryFeatures() {
return SMW_PROPERTY_QUERY | $this->description->getQueryFeatures();
}
/**
* @since 1.6
*
* @return SomeProperty
*/
public function prune( &$maxsize, &$maxdepth, &$log ) {
if ( ( $maxsize <= 0 ) || ( $maxdepth <= 0 ) ) {
$log[] = $this->getQueryString();
return new ThingDescription();
}
$maxsize--;
$maxdepth--;
$result = new SomeProperty(
$this->property,
$this->description->prune( $maxsize, $maxdepth, $log )
);
$result->setHierarchyDepth( $this->getHierarchyDepth() );
$result->setPrintRequests( $this->getPrintRequests() );
return $result;
}
}
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