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<?php |
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namespace Wikibase\DataModel\Services\Diff; |
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use Diff\DiffOp\Diff\Diff; |
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use Diff\DiffOp\DiffOp; |
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use Diff\DiffOp\DiffOpAdd; |
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use Diff\DiffOp\DiffOpChange; |
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use Diff\DiffOp\DiffOpRemove; |
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use Diff\Patcher\PatcherException; |
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use Wikibase\DataModel\Statement\Statement; |
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use Wikibase\DataModel\Statement\StatementList; |
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/** |
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* @since 3.6 |
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* |
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* @license GPL-2.0+ |
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* @author Jeroen De Dauw < [email protected] > |
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* @author Thiemo Mättig |
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*/ |
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class StatementListPatcher { |
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/** |
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* @since 3.6 |
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* |
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* @param StatementList $statements |
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* @param Diff $patch |
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* |
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* @throws PatcherException |
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*/ |
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public function patchStatementList( StatementList $statements, Diff $patch ) { |
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/** @var DiffOp $diffOp */ |
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foreach ( $patch as $diffOp ) { |
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switch ( true ) { |
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case $diffOp instanceof DiffOpAdd: |
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/** @var DiffOpAdd $diffOp */ |
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/** @var Statement $statement */ |
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$statement = $diffOp->getNewValue(); |
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$guid = $statement->getGuid(); |
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if ( $statements->getFirstStatementWithGuid( $guid ) === null ) { |
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$statements->addStatement( $statement ); |
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} |
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break; |
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case $diffOp instanceof DiffOpChange: |
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/** @var DiffOpChange $diffOp */ |
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/** @var Statement $oldStatement */ |
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/** @var Statement $newStatement */ |
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$oldStatement = $diffOp->getOldValue(); |
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$newStatement = $diffOp->getNewValue(); |
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$this->changeStatement( $statements, $oldStatement->getGuid(), $newStatement ); |
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break; |
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case $diffOp instanceof DiffOpRemove: |
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/** @var DiffOpRemove $diffOp */ |
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/** @var Statement $statement */ |
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$statement = $diffOp->getOldValue(); |
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$statements->removeStatementsWithGuid( $statement->getGuid() ); |
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break; |
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default: |
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throw new PatcherException( 'Invalid statement list diff' ); |
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} |
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} |
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} |
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/** |
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* @param StatementList $statements |
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* @param string|null $oldGuid |
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* @param Statement $newStatement |
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*/ |
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private function changeStatement( StatementList $statements, $oldGuid, Statement $newStatement ) { |
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$replacements = array(); |
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foreach ( $statements->toArray() as $statement ) { |
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$guid = $statement->getGuid(); |
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// Collect all elements starting from the first with the same GUID |
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if ( $replacements !== array() ) { |
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$guid === null |
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? $replacements[] = $statement |
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: $replacements[$guid] = $statement; |
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} elseif ( $guid === $oldGuid ) { |
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$guid === null |
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? $replacements[] = $newStatement |
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: $replacements[$guid] = $newStatement; |
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} |
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} |
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// Remove all starting from the one that should be replaced |
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foreach ( $replacements as $guid => $statement ) { |
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$statements->removeStatementsWithGuid( is_int( $guid ) ? null : $guid ); |
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} |
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// Re-add all starting from the new one |
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foreach ( $replacements as $statement ) { |
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$statements->addStatement( $statement ); |
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} |
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} |
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} |
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wmde /
WikibaseDataModelServices
