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
22using std::istringstream;
23using std::ifstream;
24using std::string;
25using std::unique_ptr;
26
27namespace android {
28namespace aidl {
29
30class 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
57class MemoryLineReader : public LineReader {
58 public:
59  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
77unique_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
86unique_ptr<LineReader> LineReader::ReadFromMemory(const string& contents) {
87  return unique_ptr<LineReader>(new MemoryLineReader(contents));
88}
89
90}  // namespace android
91}  // namespace aidl
92