CRM/Core/StateMachine.php

   1 <?php
   2 /*
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   4  | CiviCRM version 4.6                                                |
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  10  | CiviCRM is free software; you can copy, modify, and distribute it  |
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  26  */
  27
  28 /**
  29  *
  30  * @package CRM
  31  * @copyright CiviCRM LLC (c) 2004-2014
  32  * $Id$
  33  *
  34  */
  35
  36 /**
  37  * Core StateMachine. All statemachines subclass for the core one
  38  * for functionality specific to their needs.
  39  *
  40  * A statemachine keeps track of differnt states and forms for a
  41  * html quickform controller.
  42  *
  43  */
  44 class CRM_Core_StateMachine {
  45
  46   /**
  47    * The controller of this state machine
  48    * @var object
  49    */
  50   protected $_controller;
  51
  52   /**
  53    * The list of states that belong to this state machine
  54    * @var array
  55    */
  56   protected $_states;
  57
  58   /**
  59    * The list of pages that belong to this state machine. Note
  60    * that a state and a form have a 1 <-> 1 relationship. so u
  61    * can always derive one from the other
  62    * @var array
  63    */
  64   protected $_pages;
  65
  66   /**
  67    * The names of the pages
  68    *
  69    * @var array
  70    */
  71   protected $_pageNames;
  72
  73   /**
  74    * The mode that the state machine is operating in
  75    * @var int
  76    */
  77   protected $_action = NULL;
  78
  79   /**
  80    * The display name for this machine
  81    * @var string
  82    */
  83   protected $_name = NULL;
  84
  85   /**
  86    * Class constructor
  87    *
  88    * @param object $controller
  89    *   The controller for this state machine.
  90    *
  91    * @param \const|int $action
  92    *
  93    * @return \CRM_Core_StateMachine
  94    */
  95   public function __construct(&$controller, $action = CRM_Core_Action::NONE) {
  96     $this->_controller = &$controller;
  97     $this->_action = $action;
  98
  99     $this->_states = array();
 100   }
 101
 102   /**
 103    * Getter for name
 104    *
 105    * @return string
 106    */
 107   public function getName() {
 108     return $this->_name;
 109   }
 110
 111   /**
 112    * Setter for name
 113    *
 114    * @param string $name
 115    *
 116    * @return void
 117    */
 118   public function setName($name) {
 119     $this->_name = $name;
 120   }
 121
 122   /**
 123    * Do a state transition jump. Currently only supported types are
 124    * Next and Back. The other actions (Cancel, Done, Submit etc) do
 125    * not need the state machine to figure out where to go
 126    *
 127    * @param CRM_Core_Form $page
 128    *   The current form-page.
 129    * @param string $actionName
 130    *   Current action name, as one Action object can serve multiple actions.
 131    * @param string $type
 132    *   The type of transition being requested (Next or Back).
 133    *
 134    * @return void
 135    */
 136   public function perform(&$page, $actionName, $type = 'Next') {
 137     // save the form values and validation status to the session
 138     $page->isFormBuilt() or $page->buildForm();
 139
 140     $pageName = $page->getAttribute('name');
 141     $data = &$page->controller->container();
 142
 143     $data['values'][$pageName] = $page->exportValues();
 144     $data['valid'][$pageName] = $page->validate();
 145
 146     // if we are going to the next state
 147     // Modal form and page is invalid: don't go further
 148     if ($type == 'Next' && !$data['valid'][$pageName]) {
 149       return $page->handle('display');
 150     }
 151
 152     $state = &$this->_states[$pageName];
 153
 154     // dont know how or why we landed here so abort and display
 155     // current page
 156     if (empty($state)) {
 157       return $page->handle('display');
 158     }
 159
 160     // the page is valid, process it if we are jumping to the next state
 161     if ($type == 'Next') {
 162       $page->mainProcess();
 163       // we get the state again, since postProcess might have changed it
 164       // this bug took me forever to find :) Lobo
 165       $state = &$this->_states[$pageName];
 166       $state->handleNextState($page);
 167     }
 168     else {
 169       $state->handleBackState($page);
 170     }
 171   }
 172
 173   /**
 174    * Helper function to add a State to the state machine
 175    *
 176    * @param string $name
 177    *   The internal name.
 178    * @param int $type
 179    *   The type of state (START|FINISH|SIMPLE).
 180    * @param object $prev
 181    *   The previous page if any.
 182    * @param object $next
 183    *   The next page if any.
 184    *
 185    * @return void
 186    */
 187   public function addState($name, $type, $prev, $next) {
 188     $this->_states[$name] = new CRM_Core_State($name, $type, $prev, $next, $this);
 189   }
 190
 191   /**
 192    * Given a name find the corresponding state
 193    *
 194    * @param string $name
 195    *   The state name.
 196    *
 197    * @return object
 198    *   the state object
 199    */
 200   public function find($name) {
 201     if (array_key_exists($name, $this->_states)) {
 202       return $this->_states[$name];
 203     }
 204     else {
 205       return NULL;
 206     }
 207   }
 208
 209   /**
 210    * Return the list of state objects
 211    *
 212    * @return array
 213    *   array of states in the state machine
 214    */
 215   public function getStates() {
 216     return $this->_states;
 217   }
 218
 219   /**
 220    * Return the state object corresponding to the name
 221    *
 222    * @param string $name
 223    *   Name of page.
 224    *
 225    * @return CRM_Core_State
 226    *   state object matching the name
 227    */
 228   public function &getState($name) {
 229     if (isset($this->_states[$name])) {
 230       return $this->_states[$name];
 231     }
 232
 233     /*
 234      * This is a gross hack for ajax driven requests where
 235      * we change the form name to allow multiple edits to happen
 236      * We need a cleaner way of doing this going forward
 237      */
 238     foreach ($this->_states as $n => $s) {
 239       if (substr($name, 0, strlen($n)) == $n) {
 240         return $s;
 241       }
 242     }
 243
 244     return NULL;
 245   }
 246
 247   /**
 248    * Return the list of form objects
 249    *
 250    * @return array
 251    *   array of pages in the state machine
 252    */
 253   public function getPages() {
 254     return $this->_pages;
 255   }
 256
 257   /**
 258    * AddSequentialStates: meta level function to create a simple
 259    * wizard for a state machine that is completely sequential.
 260    *
 261    *
 262    * @param array $pages
 263    *   (reference ) the array of page objects.
 264    *
 265    * @internal param array $states states is an array of arrays. Each element
 266    * of the top level array describes a state. Each state description
 267    * includes the name, the display name and the class name
 268    *
 269    * @return void
 270    */
 271   public function addSequentialPages(&$pages) {
 272     $this->_pages = &$pages;
 273     $numPages = count($pages);
 274
 275     $this->_pageNames = array();
 276     foreach ($pages as $tempName => $value) {
 277       if (!empty($value['className'])) {
 278         $this->_pageNames[] = $tempName;
 279       }
 280       else {
 281         $this->_pageNames[] = CRM_Utils_String::getClassName($tempName);
 282       }
 283     }
 284
 285     $i = 0;
 286     foreach ($pages as $tempName => $value) {
 287       $name = $this->_pageNames[$i];
 288
 289       $className = CRM_Utils_Array::value('className',
 290         $value,
 291         $tempName
 292       );
 293       $classPath = str_replace('_', '/', $className) . '.php';
 294       if ($numPages == 1) {
 295         $prev = $next = NULL;
 296         $type = CRM_Core_State::START | CRM_Core_State::FINISH;
 297       }
 298       elseif ($i == 0) {
 299         // start state
 300         $prev = NULL;
 301         $next = $this->_pageNames[$i + 1];
 302         $type = CRM_Core_State::START;
 303       }
 304       elseif ($i == $numPages - 1) {
 305         // finish state
 306         $prev = $this->_pageNames[$i - 1];
 307         $next = NULL;
 308         $type = CRM_Core_State::FINISH;
 309       }
 310       else {
 311         // in between simple state
 312         $prev = $this->_pageNames[$i - 1];
 313         $next = $this->_pageNames[$i + 1];
 314         $type = CRM_Core_State::SIMPLE;
 315       }
 316
 317       $this->addState($name, $type, $prev, $next);
 318
 319       $i++;
 320     }
 321   }
 322
 323   /**
 324    * Reset the state machine
 325    *
 326    * @return void
 327    */
 328   public function reset() {
 329     $this->_controller->reset();
 330   }
 331
 332   /**
 333    * Getter for action
 334    *
 335    * @return int
 336    */
 337   public function getAction() {
 338     return $this->_action;
 339   }
 340
 341   /**
 342    * Setter for content
 343    *
 344    * @param string $content
 345    *   The content generated by this state machine.
 346    *
 347    * @return void
 348    */
 349   public function setContent(&$content) {
 350     $this->_controller->setContent($content);
 351   }
 352
 353   /**
 354    * Getter for content
 355    *
 356    * @return string
 357    */
 358   public function &getContent() {
 359     return $this->_controller->getContent();
 360   }
 361
 362   /**
 363    * @return mixed
 364    */
 365   public function getDestination() {
 366     return $this->_controller->getDestination();
 367   }
 368
 369   /**
 370    * @return mixed
 371    */
 372   public function getSkipRedirection() {
 373     return $this->_controller->getSkipRedirection();
 374   }
 375
 376   /**
 377    * @return mixed
 378    */
 379   public function fini() {
 380     return $this->_controller->fini();
 381   }
 382
 383   /**
 384    * @return mixed
 385    */
 386   public function cancelAction() {
 387     return $this->_controller->cancelAction();
 388   }
 389
 390   /**
 391    * Should the controller reset the session
 392    * In some cases, specifically search we want to remember
 393    * state across various actions and want to go back to the
 394    * beginning from the final state, but retain the same session
 395    * values
 396    *
 397    * @return bool
 398    */
 399   public function shouldReset() {
 400     return TRUE;
 401   }
 402
 403 }