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<?php
declare(strict_types=1);
namespace Doctrine\DBAL\Query\Expression;
use Countable;
use function array_merge;
use function array_values;
use function count;
use function implode;
/**
* Composite expression is responsible to build a group of similar expression.
*
* This class is immutable.
*/
class CompositeExpression implements Countable
{
/**
* Constant that represents an AND composite expression.
*/
final public const TYPE_AND = 'AND';
/**
* Constant that represents an OR composite expression.
*/
final public const TYPE_OR = 'OR';
/**
* Each expression part of the composite expression.
*
* @var array<int, self|string>
*/
private array $parts;
/** @internal Use the and() / or() factory methods. */
public function __construct(
private readonly string $type,
self|string $part,
self|string ...$parts,
) {
$this->parts = array_merge([$part], array_values($parts));
}
public static function and(self|string $part, self|string ...$parts): self
{
return new self(self::TYPE_AND, $part, ...$parts);
}
public static function or(self|string $part, self|string ...$parts): self
{
return new self(self::TYPE_OR, $part, ...$parts);
}
/**
* Returns a new CompositeExpression with the given parts added.
*/
public function with(self|string $part, self|string ...$parts): self
{
$that = clone $this;
$that->parts = array_merge($that->parts, [$part], array_values($parts));
return $that;
}
/**
* Retrieves the amount of expressions on composite expression.
*
* @psalm-return int<0, max>
*/
public function count(): int
{
return count($this->parts);
}
/**
* Retrieves the string representation of this composite expression.
*/
public function __toString(): string
{
if ($this->count() === 1) {
return (string) $this->parts[0];
}
return '(' . implode(') ' . $this->type . ' (', $this->parts) . ')';
}
/**
* Returns the type of this composite expression (AND/OR).
*/
public function getType(): string
{
return $this->type;
}
}
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