Padawan to Jedi: Interface segregation principle

padawan-to-jedi-interface-segregation-principle.md

Use the Interface Segregation Principle to tidy the following:

interface ICrew
{
  function communicate(){}
  function useLightSaber(){}
  function flyShip(ship:Ship)
}

class Jedi extends Person implements ICrew
{
  function communicate()
  {
    print("Yo WASSUP?")
  }
  
  function useLightSaber()
  {
    if isEquippedWith(Weapon.LIGHTSABER)
    {
      fushwoon()
      wern()
    }
  }
  
  function flyShip(ship:Ship)
  {
    ship.addPilot(this)
  }
}

class R2D2 extends Robot implements ICrew
{
  function communicate()
  {
    print("Beep di beep squallucks beep")
  }
  
  function useLightSaber()
  {
    // not possible as I don't haz good sword arms
  }
  
  function flyShip(ship:Ship)
  {
    ship.addPilot(this)
  }
}

interface ICrew extends ITalk, IJedi, IPilot
{
}

interface IJedi
{
  function useLightSaber(){}
{

interface ITalker
{
   function communicate(){}
}

interface IPilot
{
  function flyShip(ship:Ship)
}

class Jedi extends Person implements ICrew
{
  function communicate()
  {
    print("Yo WASSUP?")
  }

  function useLightSaber()
  {
    if isEquippedWith(Weapon.LIGHTSABER)
    {
      fushwoon()
      wern()
    }
  }

  function flyShip(ship:Ship)
  {
    ship.addPilot(this)
  }
}

class R2D2 extends Robot implements ITalker, IPilot
{
  function communicate()
  {
    print("Beep di beep squallucks beep")
  }

  function flyShip(ship:Ship)
  {
    ship.addPilot(this)
  }
}

Obviously you could make other interfaces such as talkablePilot, talkableJedi ... but this is one of the reasons why using a decorator is better as you don't have to think up every combination under the sun for your interfaces