/
StatementListPatcher.php
82 lines (73 loc) · 2.18 KB
/
StatementListPatcher.php
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<?php
namespace Wikibase\DataModel\Services\Diff;
use Diff\DiffOp\Diff\Diff;
use Diff\DiffOp\DiffOp;
use Diff\DiffOp\DiffOpAdd;
use Diff\DiffOp\DiffOpChange;
use Diff\DiffOp\DiffOpRemove;
use Diff\Patcher\PatcherException;
use Wikibase\DataModel\Statement\Statement;
use Wikibase\DataModel\Statement\StatementList;
/**
* @since 3.6
*
* @license GPL-2.0+
* @author Jeroen De Dauw < jeroendedauw@gmail.com >
* @author Thiemo Kreuz
*/
class StatementListPatcher {
/**
* @since 3.6
*
* @param StatementList $statements
* @param Diff $patch
*
* @throws PatcherException
*/
public function patchStatementList( StatementList $statements, Diff $patch ) {
/** @var DiffOp $diffOp */
foreach ( $patch as $diffOp ) {
switch ( true ) {
case $diffOp instanceof DiffOpAdd:
/** @var DiffOpAdd $diffOp */
/** @var Statement $statement */
$statement = $diffOp->getNewValue();
$guid = $statement->getGuid();
if ( $statements->getFirstStatementWithGuid( $guid ) === null ) {
$statements->addStatement( $statement );
}
break;
case $diffOp instanceof DiffOpChange:
/** @var DiffOpChange $diffOp */
/** @var Statement $oldStatement */
/** @var Statement $newStatement */
$oldStatement = $diffOp->getOldValue();
$newStatement = $diffOp->getNewValue();
$this->changeStatement( $statements, $oldStatement->getGuid(), $newStatement );
break;
case $diffOp instanceof DiffOpRemove:
/** @var DiffOpRemove $diffOp */
/** @var Statement $statement */
$statement = $diffOp->getOldValue();
$statements->removeStatementsWithGuid( $statement->getGuid() );
break;
default:
throw new PatcherException( 'Invalid statement list diff' );
}
}
}
/**
* @param StatementList $statements
* @param string|null $oldGuid
* @param Statement $newStatement
*/
private function changeStatement( StatementList $statements, $oldGuid, Statement $newStatement ) {
foreach ( $statements->toArray() as $index => $statement ) {
if ( $statement->getGuid() === $oldGuid ) {
$statements->removeStatementsWithGuid( $oldGuid );
$statements->addStatement( $newStatement, $index );
return;
}
}
}
}