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

   1 'use strict';
   2
   3 /*
   4  * The entity gives the entity framework its name. It exists only
   5  * to hold components.
   6  */
   7
   8 const Entity = class Entity {
   9   constructor(config) {
  10
  11     this._componentKeys = [];
  12     this._components = [];
  13
  14     Object.assign(this, config);
  15   }
  16
  17   /*
  18    * Adds a component to the entity.
  19    *
  20    * returns true if added, false if already present
  21    */
  22   addComponent(component) {
  23
  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
  37     if (this._componentKeys.indexOf(componentClass) >= 0) {
  38       return true;
  39     }
  40     return false;
  41   }
  42
  43   /*
  44    * returns the component associated with that key
  45    */
  46   getComponent(componentClass) {
  47
  48     const position = this._componentKeys.indexOf(componentClass);
  49     if (position >= 0) {
  50       return this._components[position];
  51     }
  52   }
  53 };
  54
  55 module.exports = Entity;