1 files changed, 77 insertions, 0 deletions
diff --git a/src/mongo/db/matcher/expression_expr.cpp b/src/mongo/db/matcher/expression_expr.cpp
new file mode 100644
index 00000000000..8344ffbca7c
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+++ b/src/mongo/db/matcher/expression_expr.cpp
@@ -0,0 +1,77 @@
+/**
+ *    Copyright (C) 2017 MongoDB Inc.
+ *
+ *    This program is free software: you can redistribute it and/or  modify
+ *    it under the terms of the GNU Affero General Public License, version 3,
+ *    as published by the Free Software Foundation.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Affero General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Affero General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *    As a special exception, the copyright holders give permission to link the
+ *    code of portions of this program with the OpenSSL library under certain
+ *    conditions as described in each individual source file and distribute
+ *    linked combinations including the program with the OpenSSL library. You
+ *    must comply with the GNU Affero General Public License in all respects for
+ *    all of the code used other than as permitted herein. If you modify file(s)
+ *    with this exception, you may extend this exception to your version of the
+ *    file(s), but you are not obligated to do so. If you do not wish to do so,
+ *    delete this exception statement from your version. If you delete this
+ *    exception statement from all source files in the program, then also delete
+ *    it in the license file.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/db/matcher/expression_expr.h"
+
+namespace mongo {
+ExprMatchExpression::ExprMatchExpression(BSONElement elem,
+                                         const boost::intrusive_ptr<ExpressionContext>& expCtx)
+    : MatchExpression(MatchType::EXPRESSION),
+      _expCtx(expCtx),
+      _expression(Expression::parseOperand(expCtx, elem, expCtx->variablesParseState)) {}
+
+bool ExprMatchExpression::matches(const MatchableDocument* doc, MatchDetails* details) const {
+    Document document(doc->toBSON());
+    auto value = _expression->evaluate(document);
+    return value.coerceToBool();
+}
+
+void ExprMatchExpression::serialize(BSONObjBuilder* out) const {
+    *out << "$expr" << _expression->serialize(false);
+}
+
+bool ExprMatchExpression::equivalent(const MatchExpression* other) const {
+    if (other->matchType() != matchType()) {
+        return false;
+    }
+
+    const ExprMatchExpression* realOther = static_cast<const ExprMatchExpression*>(other);
+
+    if (!CollatorInterface::collatorsMatch(_expCtx->getCollator(),
+                                           realOther->_expCtx->getCollator())) {
+        return false;
+    }
+
+    // TODO SERVER-30982: Add mechanism to allow for checking Expression equivalency.
+    return ValueComparator().evaluate(_expression->serialize(false) ==
+                                      realOther->_expression->serialize(false));
+}
+
+
+std::unique_ptr<MatchExpression> ExprMatchExpression::shallowClone() const {
+    // TODO SERVER-31003: Replace Expression clone via serialization with Expression::clone().
+    BSONObjBuilder bob;
+    bob << "" << _expression->serialize(false);
+    boost::intrusive_ptr<Expression> clonedExpr =
+        Expression::parseOperand(_expCtx, bob.obj().firstElement(), _expCtx->variablesParseState);
+
+    return stdx::make_unique<ExprMatchExpression>(std::move(clonedExpr), _expCtx);
+}
+}  // namespace mongo