SERVER-29585: Create a $_internalSchemaObjectMatch MatchExpression

1 files changed, 69 insertions, 0 deletions

diff --git a/src/mongo/db/matcher/schema/expression_internal_schema_object_match.h b/src/mongo/db/matcher/schema/expression_internal_schema_object_match.h
new file mode 100644
index 00000000000..b0939635cb7
--- /dev/null
+++ b/src/mongo/db/matcher/schema/expression_internal_schema_object_match.h
@@ -0,0 +1,69 @@
+/**
+ *    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.
+ */
+
+#pragma once
+
+#include "mongo/db/matcher/expression_path.h"
+
+namespace mongo {
+
+class InternalSchemaObjectMatchExpression final : public PathMatchExpression {
+public:
+    static constexpr StringData kName = "$_internalSchemaObjectMatch"_sd;
+
+    InternalSchemaObjectMatchExpression() : PathMatchExpression(INTERNAL_SCHEMA_OBJECT_MATCH) {}
+
+    Status init(std::unique_ptr<MatchExpression> expr, StringData path) {
+        _sub = std::move(expr);
+        return setPath(path);
+    }
+
+    bool matchesSingleElement(const BSONElement& elem) const final;
+
+    std::unique_ptr<MatchExpression> shallowClone() const final;
+
+    void debugString(StringBuilder& debug, int level = 0) const final;
+
+    void serialize(BSONObjBuilder* out) const final;
+
+    bool equivalent(const MatchExpression* other) const final;
+
+    MatchExpression* getChild(size_t i) const final {
+        // 'i' must be 0 since there's always exactly one child.
+        invariant(i == 0);
+        return _sub.get();
+    }
+
+    MatchCategory getCategory() const final {
+        return MatchCategory::kOther;
+    }
+
+private:
+    std::unique_ptr<MatchExpression> _sub;
+};
+}  // namespace mongo