asked on

strategy pattern: Undefined variable: Workers

<?php
class Bob
{
   public function DoYourJob()
   {
     $H = new Hammer();
     $N = new Nails();
     $W = new WoodPlanks();
     $this->_buildDesk($H, $N, $W);     
   }

  private function _buildDesk($Hammer,$Nails,$WoodPlanks)
  {
      echo'<br>... code that builds a desk ...';
  }
}

class Jerry
{
   public function DoYourJob()
   {
     $C = new Car();
     $C->DriveTo("123 Main Street");
   }
}

class WorkForce
{
   public $Workers = array();
   public function GoToWork()
   {
      foreach($Workers as $Worker)
      {
         $Worker->DoYourJob();
      }
   }
}

$WF = new WorkForce();
$WF->Workers[] = new Bob();
$WF->Workers[] = new Jerry();
$WF->GoToWork();
?>

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Notice: Undefined variable: Workers in C:\wamp\www\test\gStrategy.php on line 32

Warning: Invalid argument supplied for foreach() in C:\wamp\www\test\gStrategy.php on line 32

ASKER CERTIFIED SOLUTION

gr8gonzo

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SOLUTION

gr8gonzo

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SOLUTION

Ray Paseur

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rgb192

ASKER

<?php
class Bob
{
   public function DoYourJob()
   {
     $H = new Hammer();
     $N = new Nails();
     $W = new WoodPlanks();
     $this->_buildDesk($H, $N, $W);     
   }

  private function _buildDesk($Hammer,$Nails,$WoodPlanks)
  {
      echo'<br>... code that builds a desk ...';
  }
}

class Jerry
{
   public function DoYourJob()
   {
     $C = new Car();
     $C->DriveTo("123 Main Street");
   }
}

class WorkForce
{
   public $Workers = array();
   public function GoToWork()
   {
      foreach($this->Workers as $Worker)
      {
         $Worker->DoYourJob();
      }
   }
}





class Hammer
{
}

class Nails
{
}

class WoodPlanks
{
}

class Car
{
  public function DriveTo($address)
  {
    echo "Okay, we're driving to {$address}";
  }
}

$WF = new WorkForce();
$WF->Workers[] = new Bob();
$WF->Workers[] = new Jerry();
$WF->GoToWork();

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output

... code that builds a desk ...Okay, we're driving to 123 Main Street

where is the strategy
I thought strategy was 'if statement'
how is code different 'if something' happens

rgb192

ASKER

thanks

gr8gonzo

Sorry, I was on vacation. The strategy part of it isn't just the word"if" - strategy patterns just indicate conditional processing in general - that the SAME bit of code can be executed DIFFERENTLY based on the conditions and parameters.

rgb192

ASKER

SAME bit of code can be executed DIFFERENTLY based on the conditions and parameters.

thanks for clarification