text: /*
   * Copyright (C) 2015, The Android Open Source Project
   *
   * 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
   *
   *     http://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.
   */
  
  #include "line_reader.h"
  
  #include <fstream>
  #include <sstream>
  
  using std::istringstream;
  using std::ifstream;
  using std::string;
  using std::unique_ptr;
  
  namespace android {
  namespace aidl {
  
  class FileLineReader : public LineReader {
   public:
    FileLineReader() = default;
    virtual ~FileLineReader() {
      input_stream_.close();
    }
  
    bool Init(const std::string& file_path) {
      input_stream_.open(file_path, ifstream::in | ifstream::binary);
      return input_stream_.is_open() && input_stream_.good();
    }
  
    bool ReadLine(string* line) override {
      if (!input_stream_.good()) {
        return false;
      }
      line->clear();
      std::getline(input_stream_, *line);
      return true;
    }
  
   private:
    ifstream input_stream_;
  
    DISALLOW_COPY_AND_ASSIGN(FileLineReader);
  };  // class FileLineReader
  
  class MemoryLineReader : public LineReader {
   public:
    MemoryLineReader(const string& contents) : input_stream_(contents) {}
    virtual ~MemoryLineReader() = default;
  
    bool ReadLine(string* line) override {
      if (!input_stream_.good()) {
        return false;
      }
      line->clear();
      std::getline(input_stream_, *line);
      return true;
    }
  
   private:
    istringstream input_stream_;
  
    DISALLOW_COPY_AND_ASSIGN(MemoryLineReader);
  };  // class MemoryLineReader
  
  unique_ptr<LineReader> LineReader::ReadFromFile(const string& file_path) {
    unique_ptr<FileLineReader> file_reader(new FileLineReader());
    unique_ptr<LineReader> ret;
    if (file_reader->Init(file_path)) {
      ret.reset(file_reader.release());
    }
    return ret;
  }
  
  unique_ptr<LineReader> LineReader::ReadFromMemory(const string& contents) {
    return unique_ptr<LineReader>(new MemoryLineReader(contents));
  }
  
  }  // namespace android
  }  // namespace aidl
  