client/src/app/shared/rest/rest-extractor.service.ts

   1 import { Injectable } from '@angular/core'
   2 import { Observable } from 'rxjs/Observable'
   3 import { HttpErrorResponse } from '@angular/common/http'
   4
   5 import { Utils } from '../utils'
   6 import { ResultList } from '../../../../../shared'
   7
   8 @Injectable()
   9 export class RestExtractor {
  10
  11   extractDataBool () {
  12     return true
  13   }
  14
  15   applyToResultListData <T> (result: ResultList<T>, fun: Function, additionalArgs?: any[]): ResultList<T> {
  16     const data: T[] = result.data
  17     const newData: T[] = []
  18
  19     data.forEach(d => newData.push(fun.call(this, d, additionalArgs)))
  20
  21     return {
  22       total: result.total,
  23       data: newData
  24     }
  25   }
  26
  27   convertResultListDateToHuman <T> (result: ResultList<T>, fieldsToConvert: string[] = [ 'createdAt' ]): ResultList<T> {
  28     return this.applyToResultListData(result, this.convertDateToHuman, [ fieldsToConvert ])
  29   }
  30
  31   convertDateToHuman (target: object, fieldsToConvert: string[]) {
  32     const source = {}
  33     fieldsToConvert.forEach(field => {
  34       source[field] = Utils.dateToHuman(target[field])
  35     })
  36
  37     return Object.assign(target, source)
  38   }
  39
  40   handleError (err: HttpErrorResponse) {
  41     let errorMessage
  42
  43     if (err.error instanceof Error) {
  44       // A client-side or network error occurred. Handle it accordingly.
  45       errorMessage = err.error.message
  46       console.error('An error occurred:', errorMessage)
  47     } else if (err.status !== undefined) {
  48       // The backend returned an unsuccessful response code.
  49       // The response body may contain clues as to what went wrong,
  50       errorMessage = err.error
  51       console.error(`Backend returned code ${err.status}, body was: ${errorMessage}`)
  52     } else {
  53       errorMessage = err
  54     }
  55
  56     return Observable.throw(errorMessage)
  57   }
  58 }