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<?php
/*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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\DBAL\Query\Expression;
/**
* Composite expression is responsible to build a group of similar expression.
*
* @link www.doctrine-project.org
* @since 2.1
* @author Guilherme Blanco <guilhermeblanco@hotmail.com>
* @author Benjamin Eberlei <kontakt@beberlei.de>
*/
class CompositeExpression implements \Countable
{
/**
* Constant that represents an AND composite expression.
*/
const TYPE_AND = 'AND';
/**
* Constant that represents an OR composite expression.
*/
const TYPE_OR = 'OR';
/**
* The instance type of composite expression.
*
* @var string
*/
private $type;
/**
* Each expression part of the composite expression.
*
* @var array
*/
private $parts = array();
/**
* Constructor.
*
* @param string $type Instance type of composite expression.
* @param array $parts Composition of expressions to be joined on composite expression.
*/
public function __construct($type, array $parts = array())
{
$this->type = $type;
$this->addMultiple($parts);
}
/**
* Adds multiple parts to composite expression.
*
* @param array $parts
*
* @return \Doctrine\DBAL\Query\Expression\CompositeExpression
*/
public function addMultiple(array $parts = array())
{
foreach ((array) $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($part) || ($part instanceof self && $part->count() > 0)) {
$this->parts[] = $part;
}
return $this;
}
/**
* Retrieves the amount of expressions on composite expression.
*
* @return integer
*/
public function count()
{
return count($this->parts);
}
/**
* Retrieves the string representation of this composite expression.
*
* @return string
*/
public function __toString()
{
if (count($this->parts) === 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;
}
}
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