<?php

//copyright Lawrence Truett and FluffyCat.com 2005, all rights reserved

  include_once('BookColleague.php');
  include_once('BookAuthorColleague.php');
  include_once('BookTitleColleague.php');

  class BookMediator {

    private $authorObject;
    private $titleObject;

    function __construct($author_in, $title_in) {
      $this->authorObject = new BookAuthorColleague($author_in,$this);
      $this->titleObject  = new BookTitleColleague($title_in,$this);
    }

    function getAuthor() {return $this->authorObject;}
    function getTitle() {return $this->titleObject;}

    //when title or author change case, this makes sure the other
	//  stays in sync
    function change(BookColleague $changingClassIn) {
      if ($changingClassIn instanceof BookAuthorColleague) {
        if ('upper' == $changingClassIn->getState()) {
          if ('upper' != $this->getTitle()->getState()) {
            $this->getTitle()->setTitleUpperCase();
          }
        } elseif ('lower' == $changingClassIn->getState()) {
          if ('lower' != $this->getTitle()->getState()) {
            $this->getTitle()->setTitleLowerCase();
          }
        }
      } elseif ($changingClassIn instanceof BookTitleColleague) {
        if ('upper' == $changingClassIn->getState()) {
          if ('upper' != $this->getAuthor()->getState()) {
            $this->getAuthor()->setAuthorUpperCase();
          }
        } elseif ('lower' == $changingClassIn->getState()) {
          if ('lower' != $this->getAuthor()->getState()) {
            $this->getAuthor()->setAuthorLowerCase();
          }
        }
      }
    }

  }

?>