xref: /aosp_15_r20/external/timezone-boundary-builder/util/featureWriterStream.js (revision f0df97945b4fdddd066170b120f192941b8d7fbf) 
1const fs = require('fs')
2
3class FeatureWriterStream {
4  constructor (file) {
5    this.file = file
6    this.stream = fs.createWriteStream(file)
7    this.stream.write('{"type":"FeatureCollection","features":[')
8    this.numFeatures = 0
9  }
10
11  add (stringifiedFeature) {
12    if (this.numFeatures > 0) {
13      this.stream.write(',')
14    }
15    this.stream.write(stringifiedFeature)
16    this.numFeatures++
17  }
18
19  end (cb) {
20    console.log(`Closing out file ${this.file}`)
21    this.stream.end(']}', cb)
22  }
23}
24
25module.exports = FeatureWriterStream
26