@darwino/darwino/dist/lib/ArrayDataFetcher.js

A set of Javascript classes and utilities

import _defineProperty from "@babel/runtime/helpers/esm/defineProperty";

/* 
 * (c) Copyright Darwino Inc. 2014-2017.
 */
export default class ArrayDataFetcher {
  constructor(props) {
    _defineProperty(this, "firstPage", 0);

    _defineProperty(this, "pageSize", 1000000);

    _defineProperty(this, "_array", []);

    _defineProperty(this, "_eof", false);

    _defineProperty(this, "_fetching", false);

    _defineProperty(this, "_error", false);

    _defineProperty(this, "_errorMsg", null);

    Object.assign(this, props);
  }

  init() {
    this._array = [];
    this._eof = false;
    this._error = false;
    this._errorMsg = null;
    this.loadMoreRows();
  }

  getArray() {
    return this._array;
  }

  isFetching() {
    return this._fetching;
  }

  isError() {
    return this._error;
  }

  getErrorMessage() {
    return this._errorMsg;
  }

  hasMoreRows() {
    return !this._error && !this._eof;
  }

  getRow(i) {
    return this._array[i];
  }

  getRows(skip, limit) {
    return this._array.slice(skip, limit);
  }

  getRowCount() {
    return this._array.length;
  }

  loadMoreRows() {
    if (!this._eof) {
      var num = this._array.length / this.pageSize + this.firstPage;
      var pageSize = this.pageSize;
      this.dataLoader(num, pageSize).then(data => {
        this._array = this._array.concat(data);
        this._eof = data.length < pageSize;
        this._fetching = false;
        this._error = false;
        this._errorMsg = null; // Send an event for the content changed

        if (this.onDataLoaded) this.onDataLoaded(num - this.firstPage, pageSize);
      }, error => {
        // Error
        this._fetching = false;
        this._error = true;
        this._errorMsg = error.message; // Send an event for the content changed

        if (this.onDataLoaded) this.onDataLoaded(0, 0);
      });
      this._fetching = true;
    }
  }

}
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