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diff --git a/vendor/doctrine/collections/lib/Doctrine/Common/Collections/Expr/ExpressionVisitor.php b/vendor/doctrine/collections/lib/Doctrine/Common/Collections/Expr/ExpressionVisitor.php
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+++ b/vendor/doctrine/collections/lib/Doctrine/Common/Collections/Expr/ExpressionVisitor.php
@@ -0,0 +1,82 @@
+<?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\Expr;
+
+/**
+ * An Expression visitor walks a graph of expressions and turns them into a
+ * query for the underlying implementation.
+ *
+ * @author Benjamin Eberlei <kontakt@beberlei.de>
+ */
+abstract class ExpressionVisitor
+{
+    /**
+     * Converts a comparison expression into the target query language output.
+     *
+     * @param Comparison $comparison
+     *
+     * @return mixed
+     */
+    abstract public function walkComparison(Comparison $comparison);
+
+    /**
+     * Converts a value expression into the target query language part.
+     *
+     * @param Value $value
+     *
+     * @return mixed
+     */
+    abstract public function walkValue(Value $value);
+
+    /**
+     * Converts a composite expression into the target query language output.
+     *
+     * @param CompositeExpression $expr
+     *
+     * @return mixed
+     */
+    abstract public function walkCompositeExpression(CompositeExpression $expr);
+
+    /**
+     * Dispatches walking an expression to the appropriate handler.
+     *
+     * @param Expression $expr
+     *
+     * @return mixed
+     *
+     * @throws \RuntimeException
+     */
+    public function dispatch(Expression $expr)
+    {
+        switch (true) {
+            case ($expr instanceof Comparison):
+                return $this->walkComparison($expr);
+
+            case ($expr instanceof Value):
+                return $this->walkValue($expr);
+
+            case ($expr instanceof CompositeExpression):
+                return $this->walkCompositeExpression($expr);
+
+            default:
+                throw new \RuntimeException("Unknown Expression " . get_class($expr));
+        }
+    }
+}