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<?php
namespace SMW;
use Title;
/**
* Utility class to create unified hash keys for a variety of objects
*
* @license GNU GPL v2+
* @since 2.1
*
* @author mwjames
*/
class HashBuilder {
/**
* @since 2.4
*
* @param SemanticData $semanticData
*
* @return string
*/
public static function createFromSemanticData( SemanticData $semanticData ) {
$hash = [];
$hash[] = $semanticData->getSubject()->getSerialization();
foreach ( $semanticData->getProperties() as $property ) {
$hash[] = $property->getKey();
foreach ( $semanticData->getPropertyValues( $property ) as $di ) {
$hash[] = $di->getSerialization();
}
}
foreach ( $semanticData->getSubSemanticData() as $data ) {
$hash[] = $data->getHash();
}
sort( $hash );
return md5( implode( '#', $hash ) );
}
/**
* @since 2.1
*
* @param string|array $hashableContent
* @param string $prefix
*
* @return string
*/
public static function createFromContent( $hashableContent, $prefix = '' ) {
if ( is_string( $hashableContent ) ) {
$hashableContent = [ $hashableContent ];
}
return $prefix . md5( json_encode( $hashableContent ) );
}
/**
* @since 2.5
*
* @param array $hashableContent
* @param string $prefix
*
* @return string
*/
public static function createFromArray( array $hashableContent, $prefix = '' ) {
return $prefix . md5( json_encode( $hashableContent ) );
}
/**
* @since 2.4
*
* @return string
*/
public static function createFromSegments( /* args */ ) {
return implode( '#', func_get_args() );
}
/**
* @deprecated since 2.4, use Hash::createFromSegments
* @since 2.1
*
* @param string $title
* @param string $namespace
* @param string $interwiki
* @param string $fragment
*
* @return string
*/
public static function createHashIdFromSegments( $title, $namespace, $interwiki = '', $fragment = '' ) {
return self::createFromSegments( $title, $namespace, $interwiki, $fragment );
}
/**
* @since 2.1
*
* @param Title $title
*
* @return string
*/
public static function getHashIdForTitle( Title $title ) {
return self::createFromSegments(
$title->getDBKey(),
$title->getNamespace(),
$title->getInterwiki(),
$title->getFragment()
);
}
/**
* @since 2.1
*
* @param DIWikiPage $dataItem
*
* @return string
*/
public static function getHashIdForDiWikiPage( DIWikiPage $dataItem ) {
return self::createFromSegments(
$dataItem->getDBKey(),
$dataItem->getNamespace(),
$dataItem->getInterwiki(),
$dataItem->getSubobjectName()
);
}
/**
* @since 2.1
*
* @param string $hash
*
* @return Title|null
*/
public static function newTitleFromHash( $hash ) {
list( $title, $namespace, $interwiki, $fragement ) = explode( '#', $hash, 4 );
return Title::makeTitle( $namespace, $title, $fragement, $interwiki );
}
/**
* @note This method does not make additional checks therefore it is assumed
* that the input hash is derived or generated from HashBuilder::getSegmentedHashId
*
* @since 2.1
*
* @param string
*
* @return DIWikiPage|null
*/
public static function newDiWikiPageFromHash( $hash ) {
list( $title, $namespace, $interwiki, $subobjectName ) = explode( '#', $hash, 4 );
// A leading underscore is an internal SMW convention to describe predefined
// properties and as such need to be transformed into a valid representation
if ( $title{0} === '_' ) {
$title = str_replace( ' ', '_', PropertyRegistry::getInstance()->findPropertyLabelById( $title ) );
}
return new DIWikiPage( $title, $namespace, $interwiki, $subobjectName );
}
}
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