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<?php
namespace Doctrine\Common\Collections\Expr;
use RuntimeException;
/**
* Expression of Expressions combined by AND or OR operation.
*/
class CompositeExpression implements Expression
{
public const TYPE_AND = 'AND';
public const TYPE_OR = 'OR';
/** @var string */
private $type;
/** @var Expression[] */
private $expressions = [];
/**
* @param string $type
* @param mixed[] $expressions
*
* @throws RuntimeException
*/
public function __construct($type, array $expressions)
{
$this->type = $type;
foreach ($expressions as $expr) {
if ($expr instanceof Value) {
throw new RuntimeException('Values are not supported expressions as children of and/or expressions.');
}
if (! ($expr instanceof Expression)) {
throw new RuntimeException('No expression given to CompositeExpression.');
}
$this->expressions[] = $expr;
}
}
/**
* Returns the list of expressions nested in this composite.
*
* @return Expression[]
*/
public function getExpressionList()
{
return $this->expressions;
}
/** @return string */
public function getType()
{
return $this->type;
}
/**
* {@inheritDoc}
*/
public function visit(ExpressionVisitor $visitor)
{
return $visitor->walkCompositeExpression($this);
}
}
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