CompositeExpression.php

<?php

/*
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 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license. For more information, see
 * <http://www.doctrine-project.org>.
 */
namespace Doctrine\Common\Collections\Expr;


/**
 * Expression of Expressions combined by AND or OR operation.
 *
 * @author Benjamin Eberlei <kontakt@beberlei.de>
 * @since 2.3
 */
class CompositeExpression implements Expression {
  const TYPE_AND = 'AND';
  const TYPE_OR = 'OR';
  private $type;
  private $expressions = array();
  public function __construct($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;
    }
  }

  /**
   * Return the list of expressions nested in this composite.
   *
   * @return Expression[]
   */
  public function getExpressionList() {
    return $this->expressions;
  }
  public function getType() {
    return $this->type;
  }
  public function visit(ExpressionVisitor $visitor) {
    return $visitor
      ->walkCompositeExpression($this);
  }

}