[BUGFIX] Caching framework: Reduce code duplication in db backend
[Packages/TYPO3.CMS.git] / t3lib / class.t3lib_extobjbase.php
1 <?php
2 /***************************************************************
3 * Copyright notice
4 *
5 * (c) 1999-2011 Kasper Skårhøj (kasperYYYY@typo3.com)
6 * All rights reserved
7 *
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9 * free software; you can redistribute it and/or modify
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11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * The GNU General Public License can be found at
15 * http://www.gnu.org/copyleft/gpl.html.
16 * A copy is found in the textfile GPL.txt and important notices to the license
17 * from the author is found in LICENSE.txt distributed with these scripts.
18 *
19 *
20 * This script is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
24 *
25 * This copyright notice MUST APPEAR in all copies of the script!
26 ***************************************************************/
27 /**
28 * Contains the base class for 'Extension Objects' in backend modules.
29 *
30 * Revised for TYPO3 3.6 July/2003 by Kasper Skårhøj
31 *
32 * @author Kasper Skårhøj <kasperYYYY@typo3.com>
33 */
34 /**
35 * [CLASS/FUNCTION INDEX of SCRIPT]
36 *
37 *
38 *
39 * 145: class t3lib_extobjbase
40 * 197: function init(&$pObj,$conf)
41 * 221: function handleExternalFunctionValue()
42 * 237: function incLocalLang()
43 * 253: function checkExtObj()
44 * 268: function extObjContent()
45 * 279: function modMenu()
46 *
47 * TOTAL FUNCTIONS: 6
48 * (This index is automatically created/updated by the extension "extdeveval")
49 *
50 */
51
52
53 /**
54 * EXAMPLE: One level.
55 *
56 * This can be seen in the extension 'cms' where the info module have a function added. In 'ext_tables.php' this is done by this function call:
57 *
58 * t3lib_extMgm::insertModuleFunction(
59 * 'web_info',
60 * 'tx_cms_webinfo_page',
61 * t3lib_extMgm::extPath($_EXTKEY).'web_info/class.tx_cms_webinfo.php',
62 * 'LLL:EXT:cms/locallang_tca.php:mod_tx_cms_webinfo_page'
63 * );
64 *
65 *
66 *
67 * EXAMPLE: Two levels.
68 * This is the advanced example. You can see it with the extension 'func_wizards' which is the first layer but then providing another layer for extensions to connect by.
69 * The key used in TBE_MODULES_EXT is normally 'function' (for the 'function menu') but the 'func_wizards' extension uses an alternative key for its configuration: 'wiz'.
70 * In the 'ext_tables.php' file of an extension ('wizard_crpages') which uses the framework provided by 'func_wizards' this looks like this:
71 *
72 * t3lib_extMgm::insertModuleFunction(
73 * 'web_func',
74 * 'tx_wizardcrpages_webfunc_2',
75 * t3lib_extMgm::extPath($_EXTKEY).'class.tx_wizardcrpages_webfunc_2.php',
76 * 'LLL:EXT:wizard_crpages/locallang.php:wiz_crMany',
77 * 'wiz'
78 * );
79 *
80 * But for this two-level thing to work it also requires that the parent module (the real backend module) supports it.
81 * This is the case for the modules web_func and web_info since they have two times inclusion sections in their index.php scripts. For example (from web_func):
82 *
83 * // Make instance:
84 * $SOBE = t3lib_div::makeInstance("SC_mod_web_func_index");
85 * $SOBE->init();
86 *
87 * // Include files?
88 * foreach($SOBE->include_once as $INC_FILE) include_once($INC_FILE);
89 * $SOBE->checkExtObj(); // Checking for first level external objects
90 *
91 * // Repeat Include files! - if any files has been added by second-level extensions
92 * foreach($SOBE->include_once as $INC_FILE) include_once($INC_FILE);
93 * $SOBE->checkSubExtObj(); // Checking second level external objects
94 *
95 * $SOBE->main();
96 * $SOBE->printContent();
97 *
98 * Notice that the first part is as usual: Include classes and call $SOBE->checkExtObj() to initialize any level-1 sub-modules
99 * But then again ->include_once is traversed IF the initialization of the level-1 modules might have added more files!!
100 * And after that $SOBE->checkSubExtObj() is called to initialize the second level.
101 * In this way even a third level could be supported - but most likely that is a too layered model to be practical.
102 *
103 * Anyways, the final interesting thing is to see what the framework "func_wizard" actually does:
104 *
105 * class tx_funcwizards_webfunc extends t3lib_extobjbase {
106 * var $localLangFile = "locallang.php";
107 * var $function_key = "wiz";
108 * function init(&$pObj,$conf) {
109 * // OK, handles ordinary init. This includes setting up the menu array with ->modMenu
110 * parent::init($pObj,$conf);
111 * // Making sure that any further external classes are added to the include_once array. Notice that inclusion happens twice in the main script because of this!!!
112 * $this->handleExternalFunctionValue();
113 * }
114 * ....
115 *
116 * Notice that the handleExternalFunctionValue of this class (t3lib_extobjbase) is called and that the ->function_key internal var is set!
117 *
118 * The two level-2 sub-module "wizard_crpages" and "wizard_sortpages" are totally normal "submodules".
119 */
120
121 /**
122 * Parent class for 'Extension Objects' in backend modules.
123 * Used for 'submodules' to other modules. Also called 'Function menu modules' in t3lib_extMgm. And now its even called 'Extension Objects'. Or 'Module functions'. Wish we had just one name. Or a name at all...(?) Thank God its not so advanced when it works...
124 * In other words this class is used for backend modules which is not true backend modules appearing in the menu but rather adds themselves as a new entry in the function menu which typically exists for a backend module (like Web>Functions, Web>Info or Tools etc...)
125 * The magic that binds this together is stored in the global variable $TBE_MODULES_EXT where extensions wanting to connect a module based on this class to an existing backend module store configuration which consists of the classname, script-path and a label (title/name)
126 * For more information about this, please see the large example comment for the class t3lib_SCbase. This will show the principle of a 'level-1' connection.
127 * The more advanced example - having two layers as it is done by the 'func_wizards' extension with the 'web_info' module - can be seen in the comment above.
128 *
129 * @author Kasper Skårhøj <kasperYYYY@typo3.com>
130 * @package TYPO3
131 * @subpackage t3lib
132 * @see t3lib_SCbase,tx_funcwizards_webfunc::init(), tx_funcwizards_webfunc, tx_wizardsortpages_webfunc_2
133 */
134 class t3lib_extobjbase {
135
136 /**
137 * Contains a reference to the parent (calling) object (which is probably an instance of an extension class to t3lib_SCbase)
138 *
139 * @var t3lib_SCbase
140 * @see init()
141 */
142 var $pObj; // parent SC object
143
144 /**
145 * Set to the directory name of this class file.
146 * @see init()
147 */
148 var $thisPath = '';
149
150 /**
151 * Can be hardcoded to the name of a locallang.php file (from the same directory as the class file) to use/load
152 * @see incLocalLang()
153 */
154 var $localLangFile = 'locallang.php';
155
156 /**
157 * Contains module configuration parts from TBE_MODULES_EXT if found
158 *
159 * @see handleExternalFunctionValue()
160 */
161 var $extClassConf;
162
163 /**
164 * If this value is set it points to a key in the TBE_MODULES_EXT array (not on the top level..) where another classname/filepath/title can be defined for sub-subfunctions.
165 * This is a little hard to explain, so see it in action; it used in the extension 'func_wizards' in order to provide yet a layer of interfacing with the backend module.
166 * The extension 'func_wizards' has this description: 'Adds the 'Wizards' item to the function menu in Web>Func. This is just a framework for wizard extensions.' - so as you can see it is designed to allow further connectivity - 'level 2'
167 *
168 * @see handleExternalFunctionValue(), tx_funcwizards_webfunc
169 */
170 var $function_key = '';
171
172
173 /**
174 * Initialize the object
175 *
176 * @param object A reference to the parent (calling) object (which is probably an instance of an extension class to t3lib_SCbase)
177 * @param array The configuration set for this module - from global array TBE_MODULES_EXT
178 * @return void
179 * @see t3lib_SCbase::checkExtObj()
180 */
181 function init(&$pObj, $conf) {
182 $this->pObj = $pObj;
183
184 // Path of this script:
185 $this->thisPath = dirname($conf['path']);
186 if (!@is_dir($this->thisPath)) {
187 throw new RuntimeException(
188 'TYPO3 Fatal Error: Extension "' . $this->thisPath . ' was not a directory as expected...',
189 1270853912
190 );
191 }
192
193 // Local lang:
194 $this->incLocalLang();
195
196 // Setting MOD_MENU items as we need them for logging:
197 $this->pObj->MOD_MENU = array_merge($this->pObj->MOD_MENU, $this->modMenu()); // Candidate for t3lib_div::array_merge() if integer-keys will some day make trouble...
198 }
199
200 /**
201 * If $this->function_key is set (which means there are two levels of object connectivity) then $this->extClassConf is loaded with the TBE_MODULES_EXT configuration for that sub-sub-module
202 *
203 * @return void
204 * @see $function_key, tx_funcwizards_webfunc::init()
205 */
206 function handleExternalFunctionValue() {
207 // Must clean first to make sure the correct key is set...
208 $this->pObj->MOD_SETTINGS = t3lib_BEfunc::getModuleData($this->pObj->MOD_MENU, t3lib_div::_GP('SET'), $this->pObj->MCONF['name']);
209 if ($this->function_key) {
210 $this->extClassConf = $this->pObj->getExternalItemConfig($this->pObj->MCONF['name'], $this->function_key, $this->pObj->MOD_SETTINGS[$this->function_key]);
211 if (is_array($this->extClassConf) && $this->extClassConf['path']) {
212 $this->pObj->include_once[] = $this->extClassConf['path'];
213 }
214 }
215 }
216
217 /**
218 * Including any locallang file configured and merging its content over the current global LOCAL_LANG array (which is EXPECTED to exist!!!)
219 *
220 * @return void
221 */
222 function incLocalLang() {
223 #if ($this->localLangFile && @is_file($this->thisPath.'/'.$this->localLangFile)) {
224 # include($this->thisPath.'/'.$this->localLangFile);
225 if ($this->localLangFile && (@is_file($this->thisPath . '/' . $this->localLangFile) || @is_file($this->thisPath . '/' . substr($this->localLangFile, 0, -4) . '.xml'))) {
226 $LOCAL_LANG = $GLOBALS['LANG']->includeLLFile($this->thisPath . '/' . $this->localLangFile, FALSE);
227 if (is_array($LOCAL_LANG)) {
228 $GLOBALS['LOCAL_LANG'] = t3lib_div::array_merge_recursive_overrule((array) $GLOBALS['LOCAL_LANG'], $LOCAL_LANG);
229 }
230 }
231 }
232
233 /**
234 * Same as t3lib_SCbase::checkExtObj()
235 *
236 * @return void
237 * @see t3lib_SCbase::checkExtObj()
238 */
239 function checkExtObj() {
240 if (is_array($this->extClassConf) && $this->extClassConf['name']) {
241 $this->extObj = t3lib_div::makeInstance($this->extClassConf['name']);
242 $this->extObj->init($this->pObj, $this->extClassConf);
243
244 // Re-write:
245 $this->pObj->MOD_SETTINGS = t3lib_BEfunc::getModuleData($this->pObj->MOD_MENU, t3lib_div::_GP('SET'), $this->pObj->MCONF['name']);
246 }
247 }
248
249 /**
250 * Calls the main function inside ANOTHER sub-submodule which might exist.
251 *
252 * @return void
253 */
254 function extObjContent() {
255 if (is_object($this->extObj)) {
256 return $this->extObj->main();
257 }
258 }
259
260 /**
261 * Dummy function - but is used to set up additional menu items for this submodule.
262 * For an example see the extension 'cms' where the 'web_info' submodule is defined in cms/web_info/class.tx_cms_webinfo.php, tx_cms_webinfo_page::modMenu()
263 *
264 * @return array A MOD_MENU array which will be merged together with the one from the parent object
265 * @see init(), tx_cms_webinfo_page::modMenu()
266 */
267 function modMenu() {
268 return array();
269 }
270 }
271
272 ?>