CRM-15683 - CRM_Core_Invoke - Cleanup comments. Remove duplicate code.

[civicrm-core.git] / CRM / Core / State.php

<?php
/*
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 | CiviCRM version 4.6                                                |
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 | Copyright CiviCRM LLC (c) 2004-2014                                |
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*/

/**
 * The basic state element. Each state element is linked to a form and
 * represents the form in the transition diagram. We use the state to
 * determine what action to take on various user input. Actions include
 * things like going back / stepping forward / process etc
 *
 * @package CRM
 * @copyright CiviCRM LLC (c) 2004-2014
 * $Id$
 *
 */
class CRM_Core_State {

  /**
   * State name
   * @var string
   */
  protected $_name;

  /**
   * This is a combination "OR" of the STATE_* constants defined below
   * @var int
   */
  protected $_type;

  /**
   * The state that precedes this state
   * @var CRM_Core_State
   */
  protected $_back;

  /**
   * The state that succeeds this state
   * @var CRM_Core_State
   */
  protected $_next;

  /**
   * The state machine that this state is part of
   * @var CRM_Core_StateMachine
   */
  protected $_stateMachine;

  /**
   * The different types of states. As we flush out the framework more
   * we will introduce other conditional / looping states which will
   * bring in more complexity to the framework. For now, lets keep it simple
   * @var int
   */
  const START = 1, FINISH = 2, SIMPLE = 4;

  /**
   * Constructor
   *
   * @param string $name internal name of the state
   * @param int $type state type
   * @param CRM_Core_State $back state that precedes this state
   * @param CRM_Core_State $next state that follows  this state
   * @param CRM_Core_StateMachine $stateMachine statemachine that this states belongs to
   *
   * @return CRM_Core_State
   */
  public function __construct($name, $type, $back, $next, &$stateMachine) {
    $this->_name = $name;
    $this->_type = $type;
    $this->_back = $back;
    $this->_next = $next;

    $this->_stateMachine = &$stateMachine;
  }

  public function debugPrint() {
    CRM_Core_Error::debug("{$this->_name}, {$this->_type}", "{$this->_back}, {$this->_next}");
  }

  /**
   * Given an CRM Form, jump to the previous page
   *
   * @param object the CRM_Core_Form element under consideration
   *
   * @return mixed does a jump to the back state
   */
  public function handleBackState(&$page) {
    if ($this->_type & self::START) {
      $page->handle('display');
    }
    else {
      $back = &$page->controller->getPage($this->_back);
      return $back->handle('jump');
    }
  }

  /**
   * Given an CRM Form, jump to the next page
   *
   * @param object the CRM_Core_Form element under consideration
   *
   * @return mixed does a jump to the nextstate
   */
  public function handleNextState(&$page) {
    if ($this->_type & self::FINISH) {
      $page->handle('process');
    }
    else {
      $next = &$page->controller->getPage($this->_next);
      return $next->handle('jump');
    }
  }

  /**
   * Determine the name of the next state. This is useful when we want
   * to display the navigation labels or potential path
   *
   * @return string
   */
  public function getNextState() {
    if ($this->_type & self::FINISH) {
      return NULL;
    }
    else {
      $next = &$page->controller->getPage($this->_next);
      return $next;
    }
  }

  /**
   * Mark this page as valid for the QFC framework. This is needed as
   * we build more advanced functionality into the StateMachine
   *
   * @param object the QFC data container
   *
   * @return void
   */
  public function validate(&$data) {
    $data['valid'][$this->_name] = TRUE;
  }

  /**
   * Mark this page as invalid for the QFC framework. This is needed as
   * we build more advanced functionality into the StateMachine
   *
   * @param object the QFC data container
   *
   * @return void
   */
  public function invalidate(&$data) {
    $data['valid'][$this->_name] = NULL;
  }

  /**
   * Getter for name
   *
   * @return string
   */
  public function getName() {
    return $this->_name;
  }

  /**
   * Setter for name
   *
   * @param string
   *
   * @return void
   */
  public function setName($name) {
    $this->_name = $name;
  }

  /**
   * Getter for type
   *
   * @return int
   */
  public function getType() {
    return $this->_type;
  }
}