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// Copyright 2020 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#pragma once
#include "pw_protobuf/decoder.h"
namespace pw::protobuf {
// DecodeHandler that searches for a specific field in a proto message. If the
// field is found, it cancels the decode operation. Supports searching for
// nested fields by passing in another instance of a FindDecodeHandler for the
// nested message.
class FindDecodeHandler final : public DecodeHandler {
public:
constexpr FindDecodeHandler(uint32_t field_number)
: FindDecodeHandler(field_number, nullptr) {}
constexpr FindDecodeHandler(uint32_t field_number, FindDecodeHandler* nested)
: field_number_(field_number), found_(false), nested_handler_(nested) {}
Status ProcessField(CallbackDecoder& decoder, uint32_t field_number) override;
bool found() const { return found_; }
void set_nested_handler(FindDecodeHandler* nested) {
nested_handler_ = nested;
}
private:
uint32_t field_number_;
bool found_;
FindDecodeHandler* nested_handler_;
};
} // namespace pw::protobuf
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