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<?php declare(strict_types=1); namespace Doctrine\Common\Collections\Expr; use RuntimeException; /** * An Expression visitor walks a graph of expressions and turns them into a * query for the underlying implementation. */ abstract class ExpressionVisitor { /** * Converts a comparison expression into the target query language output. * * @return mixed */ abstract public function walkComparison(Comparison $comparison); /** * Converts a value expression into the target query language part. * * @return mixed */ abstract public function walkValue(Value $value); /** * Converts a composite expression into the target query language output. * * @return mixed */ abstract public function walkCompositeExpression(CompositeExpression $expr); /** * Dispatches walking an expression to the appropriate handler. * * @return mixed * * @throws RuntimeException */ public function dispatch(Expression $expr) { return match (true) { $expr instanceof Comparison => $this->walkComparison($expr), $expr instanceof Value => $this->walkValue($expr), $expr instanceof CompositeExpression => $this->walkCompositeExpression($expr), default => throw new RuntimeException('Unknown Expression ' . $expr::class), }; } }
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