--- /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\Common\Collections;
+
+use Doctrine\Common\Collections\Expr\Comparison;
+use Doctrine\Common\Collections\Expr\CompositeExpression;
+use Doctrine\Common\Collections\Expr\Value;
+
+/**
+ * Builder for Expressions in the {@link Selectable} interface.
+ *
+ * Important Notice for interoperable code: You have to use scalar
+ * values only for comparisons, otherwise the behavior of the comparision
+ * may be different between implementations (Array vs ORM vs ODM).
+ *
+ * @author Benjamin Eberlei <kontakt@beberlei.de>
+ * @since 2.3
+ */
+class ExpressionBuilder
+{
+ /**
+ * @param mixed $x
+ *
+ * @return CompositeExpression
+ */
+ public function andX($x = null)
+ {
+ return new CompositeExpression(CompositeExpression::TYPE_AND, func_get_args());
+ }
+
+ /**
+ * @param mixed $x
+ *
+ * @return CompositeExpression
+ */
+ public function orX($x = null)
+ {
+ return new CompositeExpression(CompositeExpression::TYPE_OR, func_get_args());
+ }
+
+ /**
+ * @param string $field
+ * @param mixed $value
+ *
+ * @return Comparison
+ */
+ public function eq($field, $value)
+ {
+ return new Comparison($field, Comparison::EQ, new Value($value));
+ }
+
+ /**
+ * @param string $field
+ * @param mixed $value
+ *
+ * @return Comparison
+ */
+ public function gt($field, $value)
+ {
+ return new Comparison($field, Comparison::GT, new Value($value));
+ }
+
+ /**
+ * @param string $field
+ * @param mixed $value
+ *
+ * @return Comparison
+ */
+ public function lt($field, $value)
+ {
+ return new Comparison($field, Comparison::LT, new Value($value));
+ }
+
+ /**
+ * @param string $field
+ * @param mixed $value
+ *
+ * @return Comparison
+ */
+ public function gte($field, $value)
+ {
+ return new Comparison($field, Comparison::GTE, new Value($value));
+ }
+
+ /**
+ * @param string $field
+ * @param mixed $value
+ *
+ * @return Comparison
+ */
+ public function lte($field, $value)
+ {
+ return new Comparison($field, Comparison::LTE, new Value($value));
+ }
+
+ /**
+ * @param string $field
+ * @param mixed $value
+ *
+ * @return Comparison
+ */
+ public function neq($field, $value)
+ {
+ return new Comparison($field, Comparison::NEQ, new Value($value));
+ }
+
+ /**
+ * @param string $field
+ *
+ * @return Comparison
+ */
+ public function isNull($field)
+ {
+ return new Comparison($field, Comparison::EQ, new Value(null));
+ }
+
+ /**
+ * @param string $field
+ * @param mixed $values
+ *
+ * @return Comparison
+ */
+ public function in($field, array $values)
+ {
+ return new Comparison($field, Comparison::IN, new Value($values));
+ }
+
+ /**
+ * @param string $field
+ * @param mixed $values
+ *
+ * @return Comparison
+ */
+ public function notIn($field, array $values)
+ {
+ return new Comparison($field, Comparison::NIN, new Value($values));
+ }
+
+ /**
+ * @param string $field
+ * @param mixed $value
+ *
+ * @return Comparison
+ */
+ public function contains($field, $value)
+ {
+ return new Comparison($field, Comparison::CONTAINS, new Value($value));
+ }
+}