65654bdbcbe95e50e97de8b3764f570e5f3d1e0a
[core.git] / inc / classes / main / helper / class_BaseHelper.php
1 <?php
2 /**
3  * A generic helper class with generic methods
4  *
5  * @author              Roland Haeder <webmaster@ship-simu.org>
6  * @version             0.0.0
7  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009 Core Developer Team
8  * @license             GNU GPL 3.0 or any newer version
9  * @link                http://www.ship-simu.org
10  *
11  * This program is free software: you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation, either version 3 of the License, or
14  * (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program. If not, see <http://www.gnu.org/licenses/>.
23  */
24 class BaseHelper extends BaseFrameworkSystem {
25         /**
26          * Instance to the class which provides field values
27          */
28         private $valueInstance = null;
29
30         /**
31          * Rendered content created by the helper class
32          */
33         private $content = '';
34
35         /**
36          * Array with groups
37          */
38         private $groups = array();
39
40         /**
41          * Array with sub group
42          */
43         private $subGroups = array();
44
45         /**
46          * Previously opened group
47          */
48         private $previousGroupId = '';
49
50         /**
51          * Previously opened sub group
52          */
53         private $previousSubGroupId = '';
54
55         /**
56          * Total counter for groups and sub groups
57          */
58         private $totalCounter = 0;
59
60         // Exception constants
61         const EXCEPTION_XML_PARSER_ERROR             = 0x1e0;
62         const EXCEPTION_XML_NODE_UNKNOWN             = 0x1e1;
63         const EXCEPTION_XML_NODE_MISMATCH            = 0x1e2;
64         const EXCEPTION_GROUP_NOT_OPENED             = 0x1e3;
65         const EXCEPTION_GROUP_ALREADY_FOUND          = 0x1e4;
66         const EXCEPTION_SUB_GROUP_ALREADY_FOUND      = 0x1e5;
67         const EXCEPTION_NO_PREVIOUS_SUB_GROUP_OPENED = 0x1e6;
68         const EXCEPTION_NO_PREVIOUS_GROUP_OPENED     = 0x1e7;
69
70         /**
71          * Protected constructor
72          *
73          * @param       $className      Real name of the class
74          * @return      void
75          */
76         protected function __construct ($className) {
77                 // Call parent constructor
78                 parent::__construct($className);
79         }
80
81         /**
82          * Adds content directly
83          *
84          * @param       $newContent             New content to add
85          * @return      void
86          */
87         protected final function addContent ($newContent) {
88                 $this->content .= (string) trim($newContent) . "\n";
89         }
90
91         /**
92          * Add header content to the helper
93          *
94          * @param       $content        Content to to the base
95          * @return      void
96          */
97         protected function addHeaderContent ($content) {
98                 // Add the header content
99                 $this->groups['header']['content'] = (string) trim($content);
100         }
101
102         /**
103          * Add footer content to the helper
104          *
105          * @param       $content        Content to to the base
106          * @return      void
107          */
108         protected function addFooterContent ($content) {
109                 // Add the footer content
110                 $this->groups['footer']['content'] = (string) trim($content);
111         }
112
113         /**
114          * Adds content to the previously opened group or sub group. If a sub group
115          * was found it will be taken. If no group/sub group is opened at the moment
116          * the code will be passed to addContent().
117          *
118          * @param       $newContent             New content to add
119          * @return      void
120          */
121         protected final function addContentToPreviousGroup ($newContent) {
122                 // Check for sub/group
123                 if ($this->ifSubGroupOpenedPreviously()) {
124                         // Get sub group id
125                         $subGroupId = $this->getPreviousSubGroupId();
126
127                         // Add the content
128                         $this->subGroups[$subGroupId]['content'] .= $newContent;
129                 } elseif ($this->ifGroupOpenedPreviously()) {
130                         // Get group id
131                         $groupId = $this->getPreviousGroupId();
132
133                         // Add the content
134                         $this->groups[$groupId]['content'] .= $newContent;
135                 } else {
136                         // Add it directly
137                         $this->addContent($newContent);
138                 }
139         }
140
141         /**
142          * Getter for content
143          *
144          * @return      $content        The rendered content by this helper
145          */
146         protected final function getContent () {
147                 return $this->content;
148         }
149
150         /**
151          *  Assigns a field from the value instance with a template variable
152          *
153          * @param       $fieldName      Name of the field to assign
154          * @return      void
155          */
156         public function assignField ($fieldName) {
157                 // Get the value from value instance
158                 $fieldValue = $this->getValueField($fieldName);
159
160                 // Assign it with a template variable
161                 $this->getTemplateInstance()->assignVariable('block_' . $fieldName, $fieldValue);
162         }
163
164         /**
165          * Assigns a field from the value instance with a template variable but
166          * parses its content through a given filter method of the value instance
167          *
168          * @param       $fieldName              Name of the field to assign
169          * @param       $filterMethod   Method name to call of the value instance
170          * @return      void
171          * @todo        Rewrite this method using a helper class for filtering data
172          */
173         public function assignFieldWithFilter ($fieldName, $filterMethod) {
174                 // Get the value
175                 $fieldValue = $this->getValueField($fieldName);
176
177                 // Now filter it through the value through the filter method
178                 $filteredValue = call_user_func_array(array($this, 'doFilter' . $this->convertToClassName($filterMethod)), array($fieldValue));
179
180                 // Assign it with a template variable
181                 $this->getTemplateInstance()->assignVariable('block_' . $fieldName, $filteredValue);
182         }
183
184         /**
185          * Pre-fetches field default values from the given registry key instance into this class
186          *
187          * @param       $registryKey    Registry key which holds an object with values
188          * @param       $extraKey               Extra value instance key used if registryKey is null
189          * @return      void
190          * @throws      NullPointerException    If recovery of requested value instance failed
191          */
192         public function prefetchValueInstance ($registryKey, $extraKey = null) {
193                 try {
194                         // Get the required instance
195                         $this->valueInstance = Registry::getRegistry()->getInstance($registryKey);
196                 } catch (NullPointerException $e) {
197                         // Not set in registry
198                         // @TODO Try to log it here
199                 }
200
201                 // Is the value instance valid?
202                 if (is_null($this->valueInstance)) {
203                         // Try to create it "from scratch", by first init extra instance
204                         $extraInstance = null;
205
206                         // Shall we get an extra instance?
207                         if (!is_null($extraKey)) {
208                                 // Get the extra instance.
209                                 $extraInstance = Registry::getRegistry()->getInstance($extraKey);
210                         } // END - if
211
212                         try {
213                                 // Get the requested instance
214                                 $this->valueInstance = ObjectFactory::createObjectByConfiguredName($registryKey . '_class', array($extraInstance));
215                         } catch (FrameworkException $e) {
216                                 // Okay, nothing found so throw a null pointer exception here
217                                 throw new NullPointerException($this, self::EXCEPTION_IS_NULL_POINTER);
218                         }
219                 } // END - if
220         }
221
222         /**
223          * Opens a helper group with given group id and content or throws an
224          * exception if that group is already found regardless if it is open or
225          * closed.
226          *
227          * @param       $groupId        Group id to open
228          * @param       $content        Initial content to add to the group
229          * @param       $tag            HTML tag used to open this group
230          * @return      void
231          * @throws      HelperGroupAlreadyCreatedException      If the group was already created before
232          */
233         protected function openGroupByIdContent ($groupId, $content, $tag) {
234                 //* DEBUG: */ echo "OPEN:groupId={$groupId},content=<pre>".htmlentities($content)."</pre>\n";
235                 // Is the group already there?
236                 if (isset($this->groups[$groupId])) {
237                         // Then throw an exception here
238                         throw new HelperGroupAlreadyCreatedException(array($this, $groupId), self::EXCEPTION_GROUP_ALREADY_FOUND);
239                 } // END - if
240
241                 // Count one up
242                 $this->totalCounter++;
243
244                 // Add the group to the stack
245                 $this->groups[$this->totalCounter] = $groupId;
246                 $this->groups[$groupId]['opened']  = true;
247                 $this->groups[$groupId]['content'] = sprintf(
248                         "<!-- group %s opened (length: %s, tag: %s) //-->%s\n",
249                         $groupId,
250                         strlen($content),
251                         $tag,
252                         $content
253                 );
254                 $this->groups[$groupId]['tag'] = $tag;
255
256                 // Mark this group as previously opened
257                 $this->setPreviousGroupId($groupId);
258         }
259
260         /**
261          * Closes the previously opened group by added given content to it or
262          * throws an exception if no previous group was opened
263          *
264          * @param       $content        Content for previously opened group, or empty to use tag of opener
265          * @return      void
266          * @throws      HelperNoPreviousOpenedGroupException    If no previously opened group was found
267          */
268         public function closePreviousGroupByContent ($content = '') {
269                 // Check if any sub group was opened before
270                 if ($this->ifSubGroupOpenedPreviously()) {
271                         // Close it automatically
272                         $this->closePreviousSubGroupByContent();
273                 } // END - if
274
275                 // Check if any group was opened before
276                 if ($this->ifGroupOpenedPreviously() === false) {
277                         // Then throw an exception
278                         throw new HelperNoPreviousOpenedGroupException(array($this, $content), self::EXCEPTION_NO_PREVIOUS_SUB_GROUP_OPENED);
279                 } // END - if
280
281                 // Get previous group
282                 $groupId = $this->getPreviousGroupId();
283
284                 // Is the content empty?
285                 if ((empty($content)) && (!empty($this->groups[$groupId]['tag']))) {
286                         // Get it from opener
287                         $content = sprintf(
288                                 "<!-- group %s auto-closed //--></%s>",
289                                 $groupId,
290                                 $this->groups[$groupId]['tag']
291                         );
292                 } // END - if
293
294                 // Add content to it and mark it as closed
295                 $this->groups[$groupId]['content'] .= sprintf(
296                         "<!-- group %s closed (length: %s, tag: %s) //-->%s\n",
297                         $groupId,
298                         strlen($content),
299                         $this->groups[$groupId]['tag'],
300                         $content
301                 );
302                 $this->groups[$groupId]['opened'] = false;
303
304                 // Mark previous group as closed
305                 $this->setPreviousGroupId('');
306                 //* DEBUG: */ echo "CLOSE:groupId={$groupId}<br />\n";
307         }
308
309         /**
310          * Opens a helper sub group with given group id and content or throws an
311          * exception if that sub group is already found regardless if it is open or
312          * closed.
313          *
314          * @param       $subGroupId             Sub group id to open
315          * @param       $content                Initial content to add to the sub group
316          * @param       $tag                    HTML tag used to open this group
317          * @return      void
318          * @throws      HelperSubGroupAlreadyCreatedException   If the sub group was already created before
319          */
320         protected function openSubGroupByIdContent ($subGroupId, $content, $tag) {
321                 //* DEBUG: */ echo "OPEN:subGroupId={$subGroupId},content=".htmlentities($content)."<br />\n";
322                 // Is the group already there?
323                 if (isset($this->subGroups[$subGroupId])) {
324                         // Then throw an exception here
325                         throw new HelperSubGroupAlreadyCreatedException(array($this, $subGroupId), self::EXCEPTION_SUB_GROUP_ALREADY_FOUND);
326                 } // END - if
327
328                 // Count one up
329                 $this->totalCounter++;
330
331                 // Add the group to the stack
332                 $this->subGroups[$this->totalCounter] = $subGroupId;
333                 $this->subGroups[$subGroupId]['opened']  = true;
334                 $this->subGroups[$subGroupId]['content'] = sprintf("<!-- sub-group %s opened (length: %s, tag: %s) //-->%s\n", $subGroupId, strlen($content), $tag, $content);
335                 $this->subGroups[$subGroupId]['tag'] = $tag;
336
337                 // Mark this group as previously opened
338                 $this->setPreviousSubGroupId($subGroupId);
339         }
340
341         /**
342          * Closes the previously opened sub group by added given content to it or
343          * throws an exception if no previous sub group was opened
344          *
345          * @param       $content        Content for previously opened sub group, or leave empty to use div/span of openener
346          * @return      void
347          * @throws      HelperNoPreviousOpenedSubGroupException If no previously opened sub group was found
348          */
349         public function closePreviousSubGroupByContent ($content = '') {
350                 // Check if any sub group was opened before
351                 if ($this->ifSubGroupOpenedPreviously() === false) {
352                         // Then throw an exception
353                         throw new HelperNoPreviousOpenedSubGroupException(array($this, $content), self::EXCEPTION_NO_PREVIOUS_SUB_GROUP_OPENED);
354                 } // END - if
355
356                 // Get previous sub group
357                 $subGroupId = $this->getPreviousSubGroupId();
358
359                 // Is the content empty?
360                 if ((empty($content)) && (!empty($this->subGroups[$subGroupId]['tag']))) {
361                         // Get it from opener
362                         $content = sprintf("<!-- sub-group %s auto-closed //--></%s>", $subGroupId, $this->subGroups[$subGroupId]['tag']);
363                 } // END - if
364
365                 // Add content to it and mark it as closed
366                 $this->subGroups[$subGroupId]['content'] .= sprintf("<!-- sub-group %s closed (length: %s, tag: %s) //-->%s\n", $subGroupId, strlen($content), $this->subGroups[$subGroupId]['tag'], $content);
367                 $this->subGroups[$subGroupId]['opened'] = false;
368
369                 // Mark previous sub group as closed
370                 $this->setPreviousSubGroupId('');
371                 //* DEBUG: */ echo "CLOSE:subGroupId={$subGroupId}<br />\n";
372         }
373
374         /**
375          * Renders all group and sub group in their order
376          *
377          * @return      $content        Rendered HTML content
378          */
379         public function renderContent () {
380                 // Initialize content
381                 $content = '';
382
383                 // Is header content there?
384                 if (isset($this->groups['header'])) {
385                         // Then add it
386                         $content .= $this->groups['header']['content'] . "\n";
387                 } // END - if
388
389                 // Initiate content
390                 $content .= $this->getContent();
391
392                 // Now "walk" through all groups and sub-groups
393                 for ($idx = 1; $idx <= $this->totalCounter; $idx++) {
394                         // Is this a group and is it closed?
395                         if ((isset($this->groups[$idx])) && ($this->groups[$this->groups[$idx]]['opened'] === false)) {
396                                 // Then add it's content
397                                 $groupContent = trim($this->groups[$this->groups[$idx]]['content']);
398                                 //* DEBUG: */ echo "group={$this->groups[$idx]},content=<pre>".htmlentities($groupContent)."</pre><br />\n";
399                                 $content .= $groupContent;
400                         } elseif ((isset($this->subGroups[$idx])) && ($this->subGroups[$this->subGroups[$idx]]['opened'] === false)) {
401                                 // Then add it's content
402                                 $subGroupContent = $this->subGroups[$this->subGroups[$idx]]['content'];
403                                 //* DEBUG: */ echo "subgroup={$this->subGroups[$idx]},content=<pre>".htmlentities($subGroupContent)."</pre><br />\n";
404                                 $content .= trim($subGroupContent);
405                         } else {
406                                 // Something went wrong
407                                 $this->debugInstance(__METHOD__."(): Something unexpected happened here.");
408                         }
409                 } // END - for
410
411                 // Is footer content there?
412                 if (isset($this->groups['footer'])) {
413                         // Then add it
414                         $content .= $this->groups['footer']['content'] . "\n";
415                 } // END - if
416
417                 // Return it
418                 //* DEBUG: */ echo "content=<pre>".htmlentities($content)."</pre> (".strlen($content).")<br />\n";
419                 return $content;
420         }
421
422         /**
423          * Checks wether the specified group is opened
424          *
425          * @param       $groupId        Id of group to check
426          * @return      $isOpened       Wether the specified group is open
427          */
428         protected function ifGroupIsOpened ($groupId) {
429                 // Is the group open?
430                 $isOpened = ((isset($this->groups[$groupId])) && ($this->groups[$groupId]['opened'] === true));
431
432                 // Return status
433                 return $isOpened;
434         }
435
436         /**
437          * Getter for direct field values
438          *
439          * @param       $fieldName              Name of the field we shall fetch
440          * @return      $fieldValue             Value from field
441          */
442         public function getValueField ($fieldName) {
443                 // Construct the eval() command
444                 $eval = sprintf("\$fieldValue = \$this->valueInstance->getField('%s');",
445                         $fieldName
446                 );
447
448                 // Get the field value
449                 eval($eval);
450
451                 // Return it
452                 return $fieldValue;
453         }
454
455         /**
456          * Getter for value instance
457          *
458          * @return      $valueInstance  Instance of the class holding our values
459          */
460         public final function getValueInstance () {
461                 return $this->valueInstance;
462         }
463
464         /**
465          * Check wether a group was opened previously
466          *
467          * @return      $groupOpened    Wether any group was opened before
468          */
469         protected final function ifGroupOpenedPreviously () {
470                 $groupOpened = (!empty($this->previousGroupId));
471                 return $groupOpened;
472         }
473
474         /**
475          * Check wether a group was opened previously
476          *
477          * @return      $subGroupOpened         Wether any group was opened before
478          */
479         protected final function ifSubGroupOpenedPreviously () {
480                 $subGroupOpened = (!empty($this->previousSubGroupId));
481                 return $subGroupOpened;
482         }
483
484         /**
485          * Getter for previous group id
486          *
487          * @return      $previousGroupId        Id of previously opened group
488          */
489         protected final function getPreviousGroupId () {
490                 return $this->previousGroupId;
491         }
492
493         /**
494          * Setter for previous group id
495          *
496          * @param       $previousGroupId        Id of previously opened group
497          * @return      void
498          */
499         protected final function setPreviousGroupId ($previousGroupId) {
500                 $this->previousGroupId = (string) $previousGroupId;
501         }
502
503         /**
504          * Getter for previous sub group id
505          *
506          * @return      $previousSubGroupId             Id of previously opened sub group
507          */
508         protected final function getPreviousSubGroupId () {
509                 return $this->previousSubGroupId;
510         }
511
512         /**
513          * Setter for previous sub group id
514          *
515          * @param       $previousSubGroupId             Id of previously opened sub group
516          * @return      void
517          */
518         protected final function setPreviousSubGroupId ($previousSubGroupId) {
519                 $this->previousSubGroupId = (string) $previousSubGroupId;
520         }
521 }
522
523 // [EOF]
524 ?>