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

   1 /*
   2  * The entity gives the entity framework its name. It exists only
   3  * to hold components.
   4  */
   5
   6 export class Entity {
   7   constructor(config) {
   8
   9     this._componentKeys = [];
  10     this._components = [];
  11
  12     Object.assign(this, config);
  13   }
  14
  15   /*
  16    * Adds a component to the entity.
  17    *
  18    * returns true if added, false if already present
  19    */
  20   addComponent(component) {
  21
  22     if (this._componentKeys.indexOf(component.constructor) >= 0) {
  23       return false;
  24     }
  25
  26     this._componentKeys.push(component.constructor);
  27     this._components.push(component);
  28     return true;
  29   }
  30
  31   /*
  32    * returns true if component is included, false otherwise
  33    */
  34   hasComponent(componentClass) {
  35
  36     if (this._componentKeys.indexOf(componentClass) >= 0) {
  37       return true;
  38     }
  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 }