1 /* 2 * Copyright (C) 2024 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <utils/Singleton.h> 20 21 #include <fstream> 22 #include <optional> 23 #include <sstream> 24 #include <unordered_map> 25 26 #include <log/log.h> 27 28 namespace android::hardware::graphics::composer { 29 30 class FileNode { 31 public: 32 FileNode(const std::string& nodePath); 33 ~FileNode(); 34 35 std::string dump(); 36 37 uint32_t getLastWrittenValue(const std::string& nodeName); 38 39 std::optional<std::string> readString(const std::string& nodeName); 40 41 bool WriteUint32(const std::string& nodeName, uint32_t value); 42 43 private: 44 int getFileHandler(const std::string& nodeName); 45 46 std::string mNodePath; 47 std::unordered_map<std::string, int> mFds; 48 std::unordered_map<int, uint32_t> mLastWrittenValue; 49 }; 50 51 class FileNodeManager : public Singleton<FileNodeManager> { 52 public: 53 FileNodeManager() = default; 54 ~FileNodeManager() = default; 55 getFileNode(const std::string & nodePath)56 std::shared_ptr<FileNode> getFileNode(const std::string& nodePath) { 57 if (mFileNodes.find(nodePath) == mFileNodes.end()) { 58 mFileNodes[nodePath] = std::make_shared<FileNode>(nodePath); 59 } 60 return mFileNodes[nodePath]; 61 } 62 63 private: 64 std::unordered_map<std::string, std::shared_ptr<FileNode>> mFileNodes; 65 }; 66 67 } // namespace android::hardware::graphics::composer 68