Builder () { super.clear(); if (sessionIdBuilder_ == null) { sessionId_ = null; } else { sessionIdBuilder_.clear(); } bitField0_ = (bitField0_ & ~0x00000001); messageType_ = 1; bitField0_ = (bitField0_ & ~0x00000002); if (requestBuilder_ == null) { request_ = null; } else { requestBuilder_.clear(); } bitField0_ = (bitField0_ & ~0x00000004); if (responseBuilder_ == null) { response_ = null; } else { responseBuilder_.clear(); } bitField0_ = (bitField0_ & ~0x00000008); if (failureBuilder_ == null) { failure_ = null; } else { failureBuilder_.clear(); } bitField0_ = (bitField0_ & ~0x00000010); return this; }