--- /dev/null
+<?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.
+ *
+ * @license http://www.opensource.org/licenses/lgpl-license.php LGPL
+ * @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';
+
+ /**
+ * @var string Holds the instance type of composite expression
+ */
+ private $type;
+
+ /**
+ * @var array Each expression part of the composite expression
+ */
+ 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 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 $part
+ * @return CompositeExpression
+ */
+ public function add($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);
+ }
+
+ /**
+ * Retrieve 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) . ')';
+ }
+
+ /**
+ * Return type of this composite expression (AND/OR)
+ *
+ * @return string
+ */
+ public function getType()
+ {
+ return $this->type;
+ }
+}