56 lines
1.5 KiB
56 lines
1.5 KiB
// Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "paddle/fluid/recordio/scanner.h"
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#include <string>
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#include "paddle/fluid/platform/enforce.h"
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namespace paddle {
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namespace recordio {
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Scanner::Scanner(std::unique_ptr<std::istream> &&stream)
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: stream_(std::move(stream)), parser_(*stream_) {
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Reset();
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}
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Scanner::Scanner(const std::string &filename)
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: stream_(new std::ifstream(filename)), parser_(*stream_) {
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PADDLE_ENFORCE(static_cast<bool>(*stream_), "Cannot open file %s", filename);
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Reset();
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}
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void Scanner::Reset() {
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stream_->clear();
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stream_->seekg(0, std::ios::beg);
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parser_.Init();
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}
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std::string Scanner::Next() {
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if (stream_->eof()) {
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return "";
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}
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auto res = parser_.Next();
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if (!parser_.HasNext() && HasNext()) {
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parser_.Init();
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}
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return res;
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}
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bool Scanner::HasNext() const { return !stream_->eof(); }
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} // namespace recordio
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} // namespace paddle
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