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/*
* 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:
explicit 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
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