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textfile_store.cc
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textfile_store.cc
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/************************************************************
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 "singa/io/textfile_store.h"
#include <glog/logging.h>
namespace singa {
namespace io {
bool TextFileStore::Open(const std::string& source, Mode mode) {
if (mode == kRead)
fs_ = new std::fstream(source, std::fstream::in);
else if (mode == kCreate)
fs_ = new std::fstream(source, std::fstream::out);
mode_ = mode;
return fs_->is_open();
}
void TextFileStore::Close() {
if (fs_ != nullptr) {
if (fs_->is_open()) {
if (mode_ != kRead)
fs_->flush();
fs_->close();
}
delete fs_;
fs_ = nullptr;
}
}
bool TextFileStore::Read(std::string* key, std::string* value) {
CHECK_EQ(mode_, kRead);
CHECK(fs_ != nullptr);
CHECK(value != nullptr);
CHECK(key != nullptr);
if (!std::getline(*fs_, *value)) {
if (fs_->eof())
return false;
else
LOG(FATAL) << "error in reading csv file";
}
*key = std::to_string(lineNo_++);
return true;
}
void TextFileStore::SeekToFirst() {
CHECK_EQ(mode_, kRead);
CHECK(fs_ != nullptr);
lineNo_ = 0;
fs_->clear();
fs_->seekg(0);
}
void TextFileStore::Seek(int offset) {
}
bool TextFileStore::Write(const std::string& key, const std::string& value) {
CHECK_NE(mode_, kRead);
CHECK(fs_ != nullptr);
// csv store does not write key
*fs_ << value << '\n';
return true;
}
void TextFileStore::Flush() {
fs_->flush();
}
} // namespace io
} // namespace singa