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20 namespace Doctrine\ORM\Query\Expr;
23 * Abstract base Expr class for building DQL parts
26 * @link www.doctrine-project.org
28 * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
29 * @author Jonathan Wage <jonwage@gmail.com>
30 * @author Roman Borschel <roman@code-factory.org>
37 protected $preSeparator = '(';
42 protected $separator = ', ';
47 protected $postSeparator = ')';
52 protected $allowedClasses = array();
57 protected $parts = array();
62 public function __construct($args = array())
64 $this->addMultiple($args);
71 public function addMultiple($args = array())
73 foreach ((array) $args as $arg) {
84 public function add($arg)
86 if ( $arg !== null || ($arg instanceof self && $arg->count() > 0) ) {
87 // If we decide to keep Expr\Base instances, we can use this check
88 if ( ! is_string($arg)) {
89 $class = get_class($arg);
91 if ( ! in_array($class, $this->allowedClasses)) {
92 throw new \InvalidArgumentException("Expression of type '$class' not allowed in this context.");
96 $this->parts[] = $arg;
105 public function count()
107 return count($this->parts);
113 public function __toString()
115 if ($this->count() == 1) {
116 return (string) $this->parts[0];
119 return $this->preSeparator . implode($this->separator, $this->parts) . $this->postSeparator;