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<?php
namespace Doctrine\DBAL\Query\Expression;
use Countable;
use function count;
use function implode;
/**
* Composite expression is responsible to build a group of similar expression.
*/
class CompositeExpression implements Countable
{
/**
* Constant that represents an AND composite expression.
*/
public const TYPE_AND = 'AND';
/**
* Constant that represents an OR composite expression.
*/
public const TYPE_OR = 'OR';
/**
* The instance type of composite expression.
*
* @var string
*/
private $type;
/**
* Each expression part of the composite expression.
*
* @var self[]|string[]
*/
private $parts = [];
/**
* @param string $type Instance type of composite expression.
* @param self[]|string[] $parts Composition of expressions to be joined on composite expression.
*/
public function __construct($type, array $parts = [])
{
$this->type = $type;
$this->addMultiple($parts);
}
/**
* Adds multiple parts to composite expression.
*
* @param self[]|string[] $parts
*
* @return \Doctrine\DBAL\Query\Expression\CompositeExpression
*/
public function addMultiple(array $parts = [])
{
foreach ($parts as $part) {
$this->add($part);
}
return $this;
}
/**
* Adds an expression to composite expression.
*
* @param mixed $part
*
* @return \Doctrine\DBAL\Query\Expression\CompositeExpression
*/
public function add($part)
{
if (empty($part)) {
return $this;
}
if ($part instanceof self && count($part) === 0) {
return $this;
}
$this->parts[] = $part;
return $this;
}
/**
* Retrieves the amount of expressions on composite expression.
*
* @return int
*/
public function count()
{
return count($this->parts);
}
/**
* Retrieves the string representation of this composite expression.
*
* @return string
*/
public function __toString()
{
if ($this->count() === 1) {
return (string) $this->parts[0];
}
return '(' . implode(') ' . $this->type . ' (', $this->parts) . ')';
}
/**
* Returns the type of this composite expression (AND/OR).
*
* @return string
*/
public function getType()
{
return $this->type;
}
}