1 /* 2 * Copyright (C) 2015, 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 #include "line_reader.h" 18 19 #include <fstream> 20 #include <sstream> 21 22 using std::istringstream; 23 using std::ifstream; 24 using std::string; 25 using std::unique_ptr; 26 27 namespace android { 28 namespace aidl { 29 30 class FileLineReader : public LineReader { 31 public: 32 FileLineReader() = default; 33 virtual ~FileLineReader() { 34 input_stream_.close(); 35 } 36 37 bool Init(const std::string& file_path) { 38 input_stream_.open(file_path, ifstream::in | ifstream::binary); 39 return input_stream_.is_open() && input_stream_.good(); 40 } 41 42 bool ReadLine(string* line) override { 43 if (!input_stream_.good()) { 44 return false; 45 } 46 line->clear(); 47 std::getline(input_stream_, *line); 48 return true; 49 } 50 51 private: 52 ifstream input_stream_; 53 54 DISALLOW_COPY_AND_ASSIGN(FileLineReader); 55 }; // class FileLineReader 56 57 class MemoryLineReader : public LineReader { 58 public: 59 explicit MemoryLineReader(const string& contents) : input_stream_(contents) {} 60 virtual ~MemoryLineReader() = default; 61 62 bool ReadLine(string* line) override { 63 if (!input_stream_.good()) { 64 return false; 65 } 66 line->clear(); 67 std::getline(input_stream_, *line); 68 return true; 69 } 70 71 private: 72 istringstream input_stream_; 73 74 DISALLOW_COPY_AND_ASSIGN(MemoryLineReader); 75 }; // class MemoryLineReader 76 77 unique_ptr<LineReader> LineReader::ReadFromFile(const string& file_path) { 78 unique_ptr<FileLineReader> file_reader(new FileLineReader()); 79 unique_ptr<LineReader> ret; 80 if (file_reader->Init(file_path)) { 81 ret.reset(file_reader.release()); 82 } 83 return ret; 84 } 85 86 unique_ptr<LineReader> LineReader::ReadFromMemory(const string& contents) { 87 return unique_ptr<LineReader>(new MemoryLineReader(contents)); 88 } 89 90 } // namespace android 91 } // namespace aidl 92
