@scriptwerx/logger/src/services/logger.service.ts

Simple console logger for use in your Angular 2 applications.

import { Injectable } from '@angular/core';
import { ILogLevels, Log } from '../model/constants.model';

@Injectable()
export class LoggerService {

  /**
   *
   * @type {ILogLevels}
   * @private
   */
  private _levels: ILogLevels = Log.LEVELS;

  /**
   *
   * @type {number}
   * @private
   */
  private _currentLevel: number = this._levels.debug;

  /**
   *
   * @param type
   * @param params
   * @private
   */
  private log(type: string, ...params:any[]) {

    let console = window.console,
        logFn = console[type] || console.log || function(){ /* empty */ },
        hasApply = false;

    try {
      hasApply = !!logFn.apply;
    } catch (e) { /* empty */ }

    if (hasApply) {
      logFn.apply(console, params[0]);
    }

  }

  /**
   *
   */
  get level() {
    return this._currentLevel;
  };

  /**
   *
   * @param level
   */
  set level(level: any) {

    if (!level) {
      level = 'error';
    }

    switch(level.toLowerCase()) {
      case 'debug':
        this._currentLevel = this._levels.debug;
        break;
      case 'info':
        this._currentLevel = this._levels.info;
        break;
      case 'warn':
        this._currentLevel = this._levels.warn;
        break;
      case 'error':
        this._currentLevel = this._levels.error;
        break;
      case 'fatal':
        this._currentLevel = this._levels.fatal;
        break;
      case 'none':
        this._currentLevel = this._levels.none;
        break;
      default:
        throw new Error('LoggerService: Invalid level - ' + level + ' is not debug|info|warn|error|fatal|none');
    }
  }

  /**
   *
   * @param params
   */
  debug(...params: any[]) {
    if (this.level <= this._levels.debug) {
      this.log('debug', params);
    }
  };

  /**
   *
   * @param params
   */
  info(...params: any[]) {
    if (this.level <= this._levels.info) {
      this.log('info', params);
    }
  };

  /**
   *
   * @param params
   */
  warn(...params: any[]) {
    if (this.level <= this._levels.warn) {
      this.log('warn', params);
    }
  };

  /**
   *
   * @param params
   */
  error(...params: any[]) {
    if (this.level <= this._levels.error) {
      this.log('error', params);
    }
  };

  /**
   *
   * @param params
   */
  fatal(...params: any[]) {
    if (this.level <= this._levels.fatal) {
      this.log('fatal', params);
    }
  };
}