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<?php
namespace SMW\Query\Language;
/**
* Description of a collection of many descriptions, at least one of which
* must be satisfied (OR, disjunction).
*
* Corresponds to disjunction in OWL and SPARQL. Not available in RDFS.
*
* @license GNU GPL v2+
* @since 1.6
*
* @author Markus Krötzsch
*/
class Disjunction extends Description {
/**
* @var Description[]
*/
private $descriptions = [];
/**
* contains a single class description if any such disjunct was given;
* disjunctive classes are aggregated therei
* n
* @var null|ClassDescription
*/
private $classDescription = null;
/**
* Used if disjunction is trivially true already
*
* @var boolean
*/
private $isTrue = false;
public function __construct( array $descriptions = [] ) {
foreach ( $descriptions as $desc ) {
$this->addDescription( $desc );
}
}
/**
* @see Description::getFingerprint
* @since 2.5
*
* @return string
*/
public function getFingerprint() {
// Avoid a recursive tree
if ( $this->fingerprint !== null ) {
return $this->fingerprint;
}
$fingerprint = [];
foreach ( $this->descriptions as $description ) {
$fingerprint[$description->getFingerprint()] = true;
}
ksort( $fingerprint );
return $this->fingerprint = 'D:' . md5( implode( '|', array_keys( $fingerprint ) ) );
}
/**
* @since 3.0
*
* @param integer $hierarchyDepth
*/
public function setHierarchyDepth( $hierarchyDepth ) {
$this->fingerprint = null;
if ( $this->classDescription !== null ) {
$this->classDescription->setHierarchyDepth( $hierarchyDepth );
}
foreach ( $this->descriptions as $key => $description ) {
if ( $description instanceof SomeProperty ) {
$description->setHierarchyDepth( $hierarchyDepth );
}
}
}
public function getDescriptions() {
return $this->descriptions;
}
public function addDescription( Description $description ) {
$this->fingerprint = null;
$fingerprint = $description->getFingerprint();
if ( $description instanceof ThingDescription ) {
$this->isTrue = true;
$this->descriptions = []; // no conditions any more
$this->classDescription = null;
}
if ( !$this->isTrue ) {
// Combine class descriptions only when those describe the same state
if ( $description instanceof ClassDescription ) {
if ( is_null( $this->classDescription ) ) { // first class description
$this->classDescription = $description;
$this->descriptions[$description->getFingerprint()] = $description;
} elseif ( $this->classDescription->isMergableDescription( $description ) ) {
$this->classDescription->addDescription( $description );
} else {
$this->descriptions[$description->getFingerprint()] = $description;
}
} elseif ( $description instanceof Disjunction ) { // absorb sub-disjunctions
foreach ( $description->getDescriptions() as $subdesc ) {
$this->descriptions[$subdesc->getFingerprint()] = $subdesc;
}
// } elseif ($description instanceof SMWSomeProperty) {
///TODO: use subdisjunct. for multiple SMWSomeProperty descs with same property
} else {
$this->descriptions[$fingerprint] = $description;
}
}
// move print descriptions downwards
///TODO: This may not be a good solution, since it does modify $description and since it does not react to future cahges
$this->m_printreqs = array_merge( $this->m_printreqs, $description->getPrintRequests() );
$description->setPrintRequests( [] );
}
public function getQueryString( $asValue = false ) {
if ( $this->isTrue ) {
return '+';
}
$result = '';
$sep = $asValue ? '||':' OR ';
foreach ( $this->descriptions as $desc ) {
$subdesc = $desc->getQueryString( $asValue );
if ( $desc instanceof SomeProperty ) { // enclose in <q> for parsing
if ( $asValue ) {
$subdesc = ' <q>[[' . $subdesc . ']]</q> ';
} else {
$subdesc = ' <q>' . $subdesc . '</q> ';
}
}
$result .= ( $result ? $sep:'' ) . $subdesc;
}
if ( $asValue ) {
return $result;
}
return ' <q>' . $result . '</q> ';
}
public function isSingleton() {
/// NOTE: this neglects the unimportant case where several disjuncts describe the same object.
if ( count( $this->descriptions ) != 1 ) {
return false;
}
return $this->descriptions[0]->isSingleton();
}
public function getSize() {
$size = 0;
foreach ( $this->descriptions as $desc ) {
$size += $desc->getSize();
}
return $size;
}
public function getDepth() {
$depth = 0;
foreach ( $this->descriptions as $desc ) {
$depth = max( $depth, $desc->getDepth() );
}
return $depth;
}
public function getQueryFeatures() {
$result = SMW_DISJUNCTION_QUERY;
foreach ( $this->descriptions as $desc ) {
$result = $result | $desc->getQueryFeatures();
}
return $result;
}
public function prune( &$maxsize, &$maxdepth, &$log ) {
if ( $maxsize <= 0 ) {
$log[] = $this->getQueryString();
return new ThingDescription();
}
$prunelog = [];
$newdepth = $maxdepth;
$result = new Disjunction();
foreach ( $this->descriptions as $desc ) {
$restdepth = $maxdepth;
$result->addDescription( $desc->prune( $maxsize, $restdepth, $prunelog ) );
$newdepth = min( $newdepth, $restdepth );
}
if ( count( $result->getDescriptions() ) > 0 ) {
$log = array_merge( $log, $prunelog );
$maxdepth = $newdepth;
if ( count( $result->getDescriptions() ) == 1 ) { // simplify unary disjunctions!
$descriptions = $result->getDescriptions();
$result = array_shift( $descriptions );
}
$result->setPrintRequests( $this->getPrintRequests() );
return $result;
}
$log[] = $this->getQueryString();
$result = new ThingDescription();
$result->setPrintRequests( $this->getPrintRequests() );
return $result;
}
}
|
