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<?php
namespace SMW\SQLStore\EntityStore\DIHandlers;
use SMW\DIProperty;
use SMW\DIWikiPage;
use SMW\SQLStore\EntityStore\DataItemHandler;
use SMW\SQLStore\EntityStore\Exception\DataItemHandlerException;
use SMW\Exception\PredefinedPropertyLabelMismatchException;
use SMW\SQLStore\TableBuilder\FieldType;
use SMWDataItem as DataItem;
/**
* DataItemHandler for dataitems of type DIWikiPage.
*
* This handler is slightly different from other handlers since wikipages are
* stored in a separate table and referred to by numeric IDs. The handler thus
* returns IDs in most cases, but expects data from the SMW IDs table (with
* DBkey, namespace, interwiki, subobjectname) to be given for creating new
* dataitems. The store recognizes this special behavior from the field type
* 'p' that the handler reports for its only data field.
*
* @license GNU GPL v2+
* @since 1.8
*
* @author Nischay Nahata
* @author Markus Kroetzsch
*/
class DIWikiPageHandler extends DataItemHandler {
/**
* @since 1.8
*
* {@inheritDoc}
*/
public function getTableFields() {
return [ 'o_id' => FieldType::FIELD_ID ];
}
/**
* @since 1.8
*
* {@inheritDoc}
*/
public function getFetchFields() {
return [ 'o_id' => FieldType::FIELD_ID ];
}
/**
* @since 1.8
*
* {@inheritDoc}
*/
public function getTableIndexes() {
return [
'o_id',
// SMWSQLStore3Readers::getPropertySubjects
'p_id,s_id',
// SMWSQLStore3Readers::fetchSemanticData
// ... FROM `smw_fpt_sobj` INNER JOIN `smw_object_ids` AS o0 ON
// o_id=o0.smw_id WHERE s_id='104322'
's_id,o_id',
// SMWSQLStore3Readers::fetchSemanticData
// ... FROM `smw_di_wikipage` INNER JOIN `smw_object_ids` AS p ON
// p_id=p.smw_id INNER JOIN `smw_object_ids` AS o0 ON o_id=o0.smw_id
// WHERE s_id='104815'
's_id,p_id,o_id',
// QueryEngine::getInstanceQueryResult
// ... INNER JOIN `smw_fpt_inst` AS t3 ON t2.smw_id=t3.s_id WHERE
// (t2.smw_namespace='0' AND (t3.o_id='56')
'o_id,s_id',
// QueryEngine::getInstanceQueryResult
//'p_id,o_id,s_sort',
// SMWSQLStore3Readers::getPropertySubjects
// SELECT DISTINCT s_id FROM `smw_fpt_sobj` ORDER BY s_sort
//'s_sort,s_id',
// SELECT DISTINCT s_id FROM `smw_fpt_subp` WHERE o_id='96' ORDER BY s_sort
//'o_id,s_sort,s_id',
// In-property lookup
'o_id,p_id',
//'o_id,p_id,s_sort',
// SMWSQLStore3Readers::getPropertySubjects
// SELECT DISTINCT s_id FROM `smw_di_wikipage` WHERE (p_id='64' AND o_id='104') ORDER BY s_sort ASC
//'o_id,p_id,s_id,s_sort'
];
}
/**
* @since 1.8
*
* {@inheritDoc}
*/
public function getWhereConds( DataItem $dataItem ) {
$oid = $this->store->getObjectIds()->getSMWPageID(
$dataItem->getDBkey(),
$dataItem->getNamespace(),
$dataItem->getInterwiki(),
$dataItem->getSubobjectName()
);
return [ 'o_id' => $oid ];
}
/**
* @since 1.8
*
* {@inheritDoc}
*/
public function getInsertValues( DataItem $dataItem ) {
$oid = $this->store->getObjectIds()->makeSMWPageID(
$dataItem->getDBkey(),
$dataItem->getNamespace(),
$dataItem->getInterwiki(),
$dataItem->getSubobjectName()
);
return [ 'o_id' => $oid ];
}
/**
* @since 1.8
*
* {@inheritDoc}
*/
public function getIndexField() {
return 'o_id';
}
/**
* @since 1.8
*
* {@inheritDoc}
*/
public function getLabelField() {
return 'o_id';
}
/**
* @since 1.8
*
* {@inheritDoc}
*/
public function dataItemFromDBKeys( $dbkeys ) {
if ( !is_array( $dbkeys ) || count( $dbkeys ) != 5 ) {
throw new DataItemHandlerException( 'Failed to create data item from DB keys.' );
}
$namespace = intval( $dbkeys[1] );
// Correctly interpret internal property keys
if ( $namespace == SMW_NS_PROPERTY && $dbkeys[0] != '' &&
$dbkeys[0]{0} == '_' && $dbkeys[2] == '' ) {
try {
$property = new DIProperty( $dbkeys[0] );
} catch( PredefinedPropertyLabelMismatchException $e ) {
// Most likely an outdated, no longer existing predefined
// property, mark it as outdate
$dbkeys[2] = SMW_SQL3_SMWIW_OUTDATED;
return $this->newDiWikiPage( $dbkeys );
}
$wikipage = $property->getCanonicalDiWikiPage( $dbkeys[4] );
if ( !is_null( $wikipage ) ) {
return $wikipage;
}
}
return $this->newDiWikiPage( $dbkeys );
}
private function newDiWikiPage( $dbkeys ) {
$diWikiPage = new DIWikiPage(
$dbkeys[0],
intval( $dbkeys[1] ),
$dbkeys[2],
$dbkeys[4]
);
$diWikiPage->setSortKey( $dbkeys[3] );
return $diWikiPage;
}
}
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