68 lines
1.9 KiB
C++
68 lines
1.9 KiB
C++
// Copyright 2011 Google
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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 "base/filelinereader.h"
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#include <string.h>
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#include <string>
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#include "base/file.h"
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#include "base/logging.h"
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#include "base/scoped_ptr.h"
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namespace operations_research {
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FileLineReader::FileLineReader(const char* const filename)
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: filename_(filename), line_callback_(NULL), loaded_successfully_(false) {}
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FileLineReader::~FileLineReader() {}
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void FileLineReader::set_line_callback(Callback1<char*>* callback) {
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line_callback_.reset(callback);
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}
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void FileLineReader::Reload() {
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const int kMaxLineLength = 60 * 1024;
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File* const data_file = File::Open(filename_, "r");
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if (data_file == NULL) {
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loaded_successfully_ = false;
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return;
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}
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scoped_array<char> line(new char[kMaxLineLength]);
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for (;;) {
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char* const result = data_file->ReadLine(line.get(), kMaxLineLength);
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if (result == NULL) {
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data_file->Close();
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loaded_successfully_ = true;
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return;
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}
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// Chop the last linefeed if presend.
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int len = strlen(result);
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if (len > 0 && result[len - 1] == '\n') { // Linefeed.
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result[--len] = '\0';
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}
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if (len > 0 && result[len - 1] == '\r') { // Carriage return.
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result[--len] = '\0';
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}
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if (line_callback_.get() != NULL) {
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line_callback_->Run(result);
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}
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}
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}
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bool FileLineReader::loaded_successfully() const {
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return loaded_successfully_;
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}
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} // namespace operations_research
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