git.r.bdr.sh - rbdr/serpentity/blob - lib/serpentity/entity.js

   1 'use strict';
   2
   3 /* global Serpentity */
   4
   5 /*
   6  * The entity gives the entity framework its name. It exists only
   7  * to hold components.
   8  */
   9
  10 let Entity = class Entity {
  11   constructor (config) {
  12     this._componentKeys = [];
  13     this._components = [];
  14
  15     Object.assign(this, config || {});
  16   }
  17
  18   /*
  19    * Adds a component to the entity.
  20    *
  21    * returns true if added, false if already present
  22    */
  23   addComponent (component) {
  24     if (this._componentKeys.indexOf(component.constructor) >= 0) {
  25       return false;
  26     }
  27     this._componentKeys.push(component.constructor);
  28     this._components.push(component);
  29     return true;
  30   }
  31
  32   /*
  33    * returns true if component is included, false otherwise
  34    */
  35   hasComponent (componentClass) {
  36     if (this._componentKeys.indexOf(componentClass) >= 0) {
  37       return true;
  38     }
  39     return false;
  40   }
  41
  42   /*
  43    * returns the component associated with that key
  44    */
  45   getComponent (componentClass) {
  46     let position;
  47     position = this._componentKeys.indexOf(componentClass);
  48     if (position >= 0) {
  49       return this._components[position];
  50     }
  51   }
  52 };
  53
  54 if (typeof module !== 'undefined' && this.module !== module) {
  55   module.exports = Entity;
  56 } else {
  57   Serpentity.Entity = Entity;
  58 }