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file_reader.js
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file_reader.js
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class FileReader{
constructor(){
this.path_ = require("path");
this.filePath_ = "";
this.readStream_ = null;
this.readIF_ = null;
this.fileSize_ = 0;
}
open(file_path){
let fs = require("fs");
let stat = fs.statSync(file_path);
if (!stat) {
throw "Failed to fs.statSync(). There seems to be no file.";
}
else{
this.fileSize_ = stat.size;
}
this.filePath_ = file_path;
//let zlib = require("zlib");
let rs = fs.createReadStream(file_path);
this.readStream_ = rs; // 読み出し量はファイルサイズ基準なので,こっちをセット
if (this.getExtension(file_path) == ".gz") {
let zlib = require("zlib");
rs = rs.pipe(zlib.createGunzip());
}
let readline = require("readline");
this.readIF_ = readline.createInterface(rs, {});
}
close(){
if (this.readIF_){
this.readIF_.close();
this.readIF_ = null;
}
if (this.readStream_) {
this.readStream_.destroy();
this.readStream_ = null;
}
}
getPath(){
return this.filePath_;
}
readlines(read, finish){
this.readIF_.on("line", read);
this.readIF_.on("close", finish);
}
get fileSize(){
return this.fileSize_;
}
get bytesRead(){
return this.readStream_.bytesRead;
}
getText(){
if (this.text_) {
return this.text_;
}
this.text_ = this.buf_.toString();
return this.text_;
}
getExtension(){
let ext = this.path_.extname(this.filePath_);
return ext;
}
}
module.exports.FileReader = FileReader;