summaryrefslogtreecommitdiffstats
path: root/core/lib/Drupal/Core/Extension/ModuleHandlerInterface.php
blob: 48b5760d2d7b6ad16ab8b3e5b6566be3e6d39172 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
<?php

/**
 * @file
 * Contains Drupal\Core\Extension\ModuleHandlerInterface.
 */

namespace Drupal\Core\Extension;

/**
 * Interface for classes that manage a set of enabled modules.
 *
 * Classes implementing this interface work with a fixed list of modules and are
 * responsible for loading module files and maintaining information about module
 * dependencies and hook implementations.
 */
interface ModuleHandlerInterface {

  /**
   * Includes a module's .module file.
   *
   * This prevents including a module more than once.
   *
   * @param string $name
   *   The name of the module to load.
   *
   * @return bool
   *   TRUE if the item is loaded or has already been loaded.
   */
  public function load($name);

  /**
   * Loads all enabled modules.
   */
  public function loadAll();

  /**
   * Returns whether all modules have been loaded.
   *
   * @return bool
   *   A Boolean indicating whether all modules have been loaded. This means all
   *   modules; the load status of bootstrap modules cannot be checked.
   */
  public function isLoaded();

  /**
   * Reloads all enabled modules.
   */
  public function reload();

  /**
   * Returns the list of currently active modules.
   *
   * @return \Drupal\Core\Extension\Extension[]
   *   An associative array whose keys are the names of the modules and whose
   *   values are Extension objects.
   */
  public function getModuleList();

  /**
   * Returns a module extension object from the currently active modules list.
   *
   * @param string $name
   *   The name of the module to return.
   *
   * @return \Drupal\Core\Extension\Extension
   *   An extension object.
   *
   * @throws \InvalidArgumentException
   *   Thrown when the requested module does not exist.
   */
  public function getModule($name);

  /**
   * Sets an explicit list of currently active modules.
   *
   * @param \Drupal\Core\Extension\Extension[] $module_list
   *   An associative array whose keys are the names of the modules and whose
   *   values are Extension objects.
   */
  public function setModuleList(array $module_list = array());

  /**
   * Adds a module to the list of currently active modules.
   *
   * @param string $name
   *   The module name; e.g., 'node'.
   * @param string $path
   *   The module path; e.g., 'core/modules/node'.
   */
  public function addModule($name, $path);

  /**
   * Adds an installation profile to the list of currently active modules.
   *
   * @param string $name
   *   The profile name; e.g., 'standard'.
   * @param string $path
   *   The profile path; e.g., 'core/profiles/standard'.
   */
  public function addProfile($name, $path);

  /**
   * Determines which modules require and are required by each module.
   *
   * @param array $modules
   *   An array of module objects keyed by module name. Each object contains
   *   information discovered during a Drupal\Core\Extension\ExtensionDiscovery
   *   scan.
   *
   * @return
   *   The same array with the new keys for each module:
   *   - requires: An array with the keys being the modules that this module
   *     requires.
   *   - required_by: An array with the keys being the modules that will not work
   *     without this module.
   *
   * @see \Drupal\Core\Extension\ExtensionDiscovery
   */
  public function buildModuleDependencies(array $modules);

  /**
   * Determines whether a given module is enabled.
   *
   * @param string $module
   *   The name of the module (without the .module extension).
   *
   * @return bool
   *   TRUE if the module is both installed and enabled.
   */
  public function moduleExists($module);

  /**
   * Loads an include file for each enabled module.
   *
   * @param string $type
   *   The include file's type (file extension).
   * @param string $name
   *   (optional) The base file name (without the $type extension). If omitted,
   *   each module's name is used; i.e., "$module.$type" by default.
   */
  public function loadAllIncludes($type, $name = NULL);

  /**
   * Loads a module include file.
   *
   * Examples:
   * @code
   *   // Load node.admin.inc from the node module.
   *   $this->loadInclude('node', 'inc', 'node.admin');
   *   // Load content_types.inc from the node module.
   *   $this->loadInclude('node', 'inc', ''content_types');
   * @endcode
   *
   * @param string $module
   *   The module to which the include file belongs.
   * @param string $type
   *   The include file's type (file extension).
   * @param string $name
   *   (optional) The base file name (without the $type extension). If omitted,
   *   $module is used; i.e., resulting in "$module.$type" by default.
   *
   * @return string|false
   *   The name of the included file, if successful; FALSE otherwise.
   */
  public function loadInclude($module, $type, $name = NULL);

  /**
   * Retrieves a list of hooks that are declared through hook_hook_info().
   *
   * @return array
   *   An associative array whose keys are hook names and whose values are an
   *   associative array containing a group name. The structure of the array
   *   is the same as the return value of hook_hook_info().
   *
   * @see hook_hook_info()
   */
  public function getHookInfo();

  /**
   * Determines which modules are implementing a hook.
   *
   * @param string $hook
   *   The name of the hook (e.g. "help" or "menu").
   *
   * @return array
   *   An array with the names of the modules which are implementing this hook.
   */
  public function getImplementations($hook);

  /**
   * Write the hook implementation info to the cache.
   */
  public function writeCache();

  /**
   * Resets the cached list of hook implementations.
   */
  public function resetImplementations();

  /**
   * Returns whether a given module implements a given hook.
   *
   * @param string $module
   *   The name of the module (without the .module extension).
   * @param string $hook
   *   The name of the hook (e.g. "help" or "menu").
   *
   * @return bool
   *   TRUE if the module is both installed and enabled, and the hook is
   *   implemented in that module.
   */
  public function implementsHook($module, $hook);

  /**
   * Invokes a hook in a particular module.
   *
   * @param string $module
   *   The name of the module (without the .module extension).
   * @param string $hook
   *   The name of the hook to invoke.
   * @param ...
   *   Arguments to pass to the hook implementation.
   *
   * @return mixed
   *   The return value of the hook implementation.
   */
  public function invoke($module, $hook, array $args = array());

  /**
   * Invokes a hook in all enabled modules that implement it.
   *
   * @param string $hook
   *   The name of the hook to invoke.
   * @param array $args
   *   Arguments to pass to the hook.
   *
   * @return array
   *   An array of return values of the hook implementations. If modules return
   *   arrays from their implementations, those are merged into one array.
   */
  public function invokeAll($hook, array $args = array());

  /**
   * Passes alterable variables to specific hook_TYPE_alter() implementations.
   *
   * This dispatch function hands off the passed-in variables to type-specific
   * hook_TYPE_alter() implementations in modules. It ensures a consistent
   * interface for all altering operations.
   *
   * A maximum of 2 alterable arguments is supported. In case more arguments need
   * to be passed and alterable, modules provide additional variables assigned by
   * reference in the last $context argument:
   * @code
   *   $context = array(
   *     'alterable' => &$alterable,
   *     'unalterable' => $unalterable,
   *     'foo' => 'bar',
   *   );
   *   $this->alter('mymodule_data', $alterable1, $alterable2, $context);
   * @endcode
   *
   * Note that objects are always passed by reference in PHP5. If it is absolutely
   * required that no implementation alters a passed object in $context, then an
   * object needs to be cloned:
   * @code
   *   $context = array(
   *     'unalterable_object' => clone $object,
   *   );
   *   $this->alter('mymodule_data', $data, $context);
   * @endcode
   *
   * @param string|array $type
   *   A string describing the type of the alterable $data. 'form', 'links',
   *   'node_content', and so on are several examples. Alternatively can be an
   *   array, in which case hook_TYPE_alter() is invoked for each value in the
   *   array, ordered first by module, and then for each module, in the order of
   *   values in $type. For example, when Form API is using $this->alter() to
   *   execute both hook_form_alter() and hook_form_FORM_ID_alter()
   *   implementations, it passes array('form', 'form_' . $form_id) for $type.
   * @param mixed $data
   *   The variable that will be passed to hook_TYPE_alter() implementations to be
   *   altered. The type of this variable depends on the value of the $type
   *   argument. For example, when altering a 'form', $data will be a structured
   *   array. When altering a 'profile', $data will be an object.
   * @param mixed $context1
   *   (optional) An additional variable that is passed by reference.
   * @param mixed $context2
   *   (optional) An additional variable that is passed by reference. If more
   *   context needs to be provided to implementations, then this should be an
   *   associative array as described above.
   */
  public function alter($type, &$data, &$context1 = NULL, &$context2 = NULL);

  /**
   * Installs a given list of modules.
   *
   * Order of events:
   * - Gather and add module dependencies to $module_list (if applicable).
   * - For each module that is being installed:
   *   - Invoke hook_module_preinstall().
   *   - Install module schema and update system registries and caches.
   *   - Invoke hook_install() and add it to the list of installed modules.
   * - Invoke hook_modules_installed().
   *
   * @param array $module_list
   *   An array of module names.
   * @param bool $enable_dependencies
   *   (optional) If TRUE, dependencies will automatically be installed in the
   *   correct order. This incurs a significant performance cost, so use FALSE
   *   if you know $module_list is already complete.
   *
   * @return bool
   *   FALSE if one or more dependencies are missing, TRUE otherwise.
   *
   * @see hook_module_preinstall()
   * @see hook_install()
   * @see hook_modules_installed()
   */
  public function install(array $module_list, $enable_dependencies = TRUE);

  /**
   * Uninstalls a given list of disabled modules.
   *
   * @param array $module_list
   *   The modules to uninstall.
   * @param bool $uninstall_dependents
   *   (optional) If TRUE, dependent modules will automatically be uninstalled
   *   in the correct order. This incurs a significant performance cost, so use
   *   FALSE if you know $module_list is already complete.
   *
   * @return bool
   *   FALSE if one or more dependencies are missing, TRUE otherwise.
   *
   * @see hook_module_preuninstall()
   * @see hook_uninstall()
   * @see hook_modules_uninstalled()
   */
  public function uninstall(array $module_list, $uninstall_dependents = TRUE);

  /**
   * Returns an array of directories for all enabled modules. Useful for
   * tasks such as finding a file that exists in all module directories.
   *
   * @return array
   */
  public function getModuleDirectories();

  /**
   * Gets the human readable name of a given module.
   *
   * @param string $module
   *   The machine name of the module which title should be shown.
   *
   * @return string
   *   Returns the human readable name of the module.
   */
  public function getName($theme);

}