class ObjList
 {

  public $array_list, $i, $is_empty, $count;

  function __construct() 
   {
    $this->array_list = array();
    $this->i = 0;
    $this->count = 0;
    $this->is_empty = true;
  }


  function add($c, $bool_add_to_top = false) 
   {
    // Adds courses to the list.  Remember to perform
    // reset_counter before using this list, or the count
    // variable will be off!
    if ($bool_add_to_top == false) 
     {
      $this->array_list [] = $c;
      //adminDebug(".....adding course");
    }
    else {
      // We are going to add this to the top of the array, pushing
      // everything else down.
      $temp_array = array();
      $temp_array [0] = $c;

      $new_array = array_merge($temp_array, $this->array_list);
      $this->array_list = $new_array;
      // adminDebug("adding to top...");
    }

    $this->is_empty = false;
    $this->count = count($this->array_list);


  }

  function index_of($obj_c) 
   {
    // Find in the array an object.equals(objC), and return the
    // index.

    for ($t = 0; $t < count($this->array_list); $t++) 
     {
      if ($this->array_list [$t]->equals($obj_c)) 
       {
        return $t;
      }
    }

    return -1;

  }

  function check_is_empty() 
   {
    if (count($this->array_list) > 0) 
     {
      $this->is_empty = false;
    }
  }

  function object_index_of($obj_c) 
   {
    // This will return the array index of the exact object being requested.
    // Not the ->equals(), but rather an == of the object (the reference is the same)

    for ($t = 0; $t < count($this->array_list); $t++) 
     {
      if ($this->array_list [$t] == $obj_c) 
       {
        return $t;
      }
    }

    return -1;


  }


  function reset_counter() 
   {
    $this->i = 0;
    $this->count = count($this->array_list);
  }

  function get_first() 
   {
    if ($this->get_size() > 0) 
     {
      return $this->get_element(0);
    }
    else {
      return false;
    }
  }


  function get_element($c) 
   {

    return $this->array_list [$c];
  }



  function find_match($obj_c) 
   { // This actually returns an object if it can find
    // it using index_of.

    $c = $this->index_of($obj_c);
    if ($c > -1) 
     {
      return $this->get_element($c);
    }
    else {
      return false;
    }
  }


  function insert_after_index($new_i, $obj_c) 
   {
    $rtn = new ObjList();
    for ($t = 0; $t < $new_i; $t++) 
     {
      $rtn->add($this->array_list [$t]);
    }

    $rtn->add($obj_c);

    for ($t = $new_i; $t < count($this->array_list); $t++) 
     {
      $rtn->add($this->array_list [$t]);
    }

    $this->array_list = $rtn->array_list;
    $this->count = count($this->array_list);

  }


  function find_all_matches($obj_c) 
   {
    // This will find all the matches of objC in the
    // array, and return an ObjList of matches.
    $rtn = new ObjList();
    $bool_no_matches = true;
    for ($t = 0; $t < $this->count; $t++) 
     {
      if ($this->array_list [$t]->equals($obj_c)) 
       {
        $rtn->add($this->array_list [$t]);
        $bool_no_matches = false;
      }
    }

    if ($bool_no_matches == false) 
     {
      return $rtn;
    }
    else {
      return false;
    }

  }


  function get_size() 
   {
    return sizeof($this->array_list);
  }



  function to_string() 
   {
    // Return a string of every obj in this list.
    $rtn = "";

    for ($t = 0; $t < $this->count; $t++) 
     {
      $rtn .= $this->array_list [$t]->to_string();
    }

    return $rtn;
  }

  function has_more() 
   {
    //adminDebug("here " . count($this->array_list));
    if ($this->i < $this->count) 
     {
      return true;
    }
    else {
      return false;
    }
  }

  function get_next() 
   {
    $s = $this->array_list [$this->i];
    $this->i++;
    return $s;
  }


}