SERVER-28532 Implement UUID::appendToBuilder

2 files changed, 13 insertions, 5 deletions

diff --git a/src/mongo/util/uuid.cpp b/src/mongo/util/uuid.cpp
index ca9f527a2a5..e47889a6244 100644
--- a/src/mongo/util/uuid.cpp
+++ b/src/mongo/util/uuid.cpp
@@ -50,8 +50,6 @@ std::regex uuidRegex("[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4
 
 }  // namespace
 
-const int UUID::kNumBytes = 16;
-
 StatusWith<UUID> UUID::parse(BSONElement from) {
     try {
         return UUID{from.uuid()};
@@ -111,9 +109,13 @@ UUID UUID::gen() {
     return UUID{randomBytes};
 }
 
+void UUID::appendToBuilder(BSONObjBuilder* builder, StringData name) const {
+    builder->appendBinData(name, sizeof(UUIDStorage), BinDataType::newUUID, &_uuid);
+}
+
 BSONObj UUID::toBSON() const {
     BSONObjBuilder builder;
-    builder.appendBinData("uuid", sizeof(UUIDStorage), BinDataType::newUUID, &_uuid);
+    appendToBuilder(&builder, "uuid");
     return builder.obj();
 }
 
diff --git a/src/mongo/util/uuid.h b/src/mongo/util/uuid.h
index 5127932dd6a..22adb92ba01 100644
--- a/src/mongo/util/uuid.h
+++ b/src/mongo/util/uuid.h
@@ -44,13 +44,15 @@ namespace mongo {
  * a secure random number generator.
  */
 class UUID {
+    using UUIDStorage = std::array<unsigned char, 16>;
+
 public:
     UUID() = delete;
 
     /**
      * The number of bytes contained in a UUID.
      */
-    static const int kNumBytes;
+    static constexpr int kNumBytes = sizeof(UUIDStorage);
 
     /**
      * Generate a new random v4 UUID per RFC 4122.
@@ -75,6 +77,11 @@ public:
     static bool isUUIDString(const std::string& s);
 
     /**
+     * Append to builder as BinData(4, "...") element with the given name.
+     */
+    void appendToBuilder(BSONObjBuilder* builder, StringData name) const;
+
+    /**
      * Return a BSON object of the form { uuid: BinData(4, "...") }.
      */
     BSONObj toBSON() const;
@@ -109,7 +116,6 @@ public:
     };
 
 private:
-    using UUIDStorage = std::array<unsigned char, 16>;
     UUID(const UUIDStorage& uuid) : _uuid(uuid) {}
 
     UUIDStorage _uuid;  // UUID in network byte order