1 // Copyright 2019 The Pigweed Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not 4 // use this file except in compliance with the License. You may obtain a copy of 5 // the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12 // License for the specific language governing permissions and limitations under 13 // the License. 14 #pragma once 15 16 #include "pw_protobuf/encoder.h" 17 18 namespace pw::protobuf { 19 20 // Base class for generated encoders. Stores a reference to a low-level proto 21 // encoder. If representing a nested message, knows the field number of the 22 // message in its parent and and automatically calls Push and Pop when on the 23 // encoder when created/destroyed. 24 class ProtoMessageEncoder { 25 public: 26 ProtoMessageEncoder(Encoder* encoder, uint32_t parent_field = 0) encoder_(encoder)27 : encoder_(encoder), parent_field_(parent_field) { 28 if (parent_field_ != 0) { 29 encoder_->Push(parent_field_); 30 } 31 } 32 ~ProtoMessageEncoder()33 ~ProtoMessageEncoder() { 34 if (parent_field_ != 0) { 35 encoder_->Pop(); 36 } 37 } 38 39 protected: 40 Encoder* encoder_; 41 uint32_t parent_field_; 42 }; 43 44 } // namespace pw::protobuf 45