-
Notifications
You must be signed in to change notification settings - Fork 821
/
Object.php
1112 lines (964 loc) · 37.5 KB
/
Object.php
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
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
<?php
/**
* A base class for all sapphire objects to inherit from.
*
* This class provides a number of pattern implementations, as well as methods and fixes to add extra psuedo-static
* and method functionality to PHP.
*
* See {@link Extension} on how to implement a custom multiple
* inheritance for object instances based on PHP5 method call overloading.
*
* @todo Create instance-specific removeExtension() which removes an extension from $extension_instances,
* but not from static $extensions, and clears everything added through defineMethods(), mainly $extra_methods.
*
* @package sapphire
* @subpackage core
*/
abstract class Object {
/**
* An array of extension names and parameters to be applied to this object upon construction.
*
* Example:
* <code>
* public static $extensions = array (
* 'Hierarchy',
* "Version('Stage', 'Live')"
* );
* </code>
*
* Use {@link Object::add_extension()} to add extensions without access to the class code,
* e.g. to extend core classes.
*
* Extensions are instanciated together with the object and stored in {@link $extension_instances}.
*
* @var array $extensions
*/
public static $extensions = null;
/**#@+
* @var array
*/
private static
$statics = array(),
$cached_statics = array(),
$uninherited_statics = array(),
$cached_uninherited_statics = array(),
$extra_statics = array(),
$replaced_statics = array(),
$_cache_statics_prepared = array();
private static
$classes_constructed = array(),
$extra_methods = array(),
$built_in_methods = array();
private static
$custom_classes = array(),
$strong_classes = array();
/**#@-*/
/**
* @var string the class name
*/
public $class;
/**
* @var array all current extension instances.
*/
protected $extension_instances = array();
/**
* An implementation of the factory method, allows you to create an instance of a class
*
* This method first for strong class overloads (singletons & DB interaction), then custom class overloads. If an
* overload is found, an instance of this is returned rather than the original class. To overload a class, use
* {@link Object::useCustomClass()}
*
* @param string $class the class name
* @param mixed $arguments,... arguments to pass to the constructor
* @return Object
*/
public static function create() {
$args = func_get_args();
$class = self::getCustomClass(array_shift($args));
$reflector = new ReflectionClass($class);
return $reflector->newInstanceArgs($args);
}
private static $_cache_inst_args = array();
/**
* Create an object from a string representation. It treats it as a PHP constructor without the
* 'new' keyword. It also manages to construct the object without the use of eval().
*
* Construction itself is done with Object::create(), so that Object::useCustomClass() calls
* are respected.
*
* `Object::create_from_string("Versioned('Stage','Live')")` will return the result of
* `Object::create('Versioned', 'Stage', 'Live);`
*
* It is designed for simple, clonable objects. The first time this method is called for a given
* string it is cached, and clones of that object are returned.
*
* If you pass the $firstArg argument, this will be prepended to the constructor arguments. It's
* impossible to pass null as the firstArg argument.
*
* `Object::create_from_string("Varchar(50)", "MyField")` will return the result of
* `Object::create('Vachar', 'MyField', '50');`
*
* Arguments are always strings, although this is a quirk of the current implementation rather
* than something that can be relied upon.
*/
static function create_from_string($classSpec, $firstArg = null) {
if(!isset(self::$_cache_inst_args[$classSpec.$firstArg])) {
// an $extension value can contain parameters as a string,
// e.g. "Versioned('Stage','Live')"
if(strpos($classSpec,'(') === false) {
if($firstArg === null) self::$_cache_inst_args[$classSpec.$firstArg] = Object::create($classSpec);
else self::$_cache_inst_args[$classSpec.$firstArg] = Object::create($classSpec, $firstArg);
} else {
list($class, $args) = self::parse_class_spec($classSpec);
if($firstArg !== null) array_unshift($args, $firstArg);
array_unshift($args, $class);
self::$_cache_inst_args[$classSpec.$firstArg] = call_user_func_array(array('Object','create'), $args);
}
}
return clone self::$_cache_inst_args[$classSpec.$firstArg];
}
/**
* Parses a class-spec, such as "Versioned('Stage','Live')", as passed to create_from_string().
* Returns a 2-elemnent array, with classname and arguments
*/
static function parse_class_spec($classSpec) {
$tokens = token_get_all("<?php $classSpec");
$class = null;
$args = array();
$passedBracket = false;
// Keep track of the current bucket that we're putting data into
$bucket = &$args;
$bucketStack = array();
foreach($tokens as $token) {
$tName = is_array($token) ? $token[0] : $token;
// Get the class naem
if($class == null && is_array($token) && $token[0] == T_STRING) {
$class = $token[1];
// Get arguments
} else if(is_array($token)) {
switch($token[0]) {
case T_CONSTANT_ENCAPSED_STRING:
$argString = $token[1];
switch($argString[0]) {
case '"': $argString = stripcslashes(substr($argString,1,-1)); break;
case "'": $argString = str_replace(array("\\\\", "\\'"),array("\\", "'"), substr($argString,1,-1)); break;
default: throw new Exception("Bad T_CONSTANT_ENCAPSED_STRING arg $argString");
}
$bucket[] = $argString;
break;
case T_DNUMBER:
$bucket[] = (double)$token[1];
break;
case T_LNUMBER:
$bucket[] = (int)$token[1];
break;
case T_STRING:
switch($token[1]) {
case 'true': $args[] = true; break;
case 'false': $args[] = false; break;
default: throw new Exception("Bad T_STRING arg '{$token[1]}'");
}
case T_ARRAY:
// Add an empty array to the bucket
$bucket[] = array();
$bucketStack[] = &$bucket;
$bucket = &$bucket[sizeof($bucket)-1];
}
} else {
if($tName == ')') {
// Pop-by-reference
$bucket = &$bucketStack[sizeof($bucketStack)-1];
array_pop($bucketStack);
}
}
}
return array($class, $args);
}
/**
* Similar to {@link Object::create()}, except that classes are only overloaded if you set the $strong parameter to
* TRUE when using {@link Object::useCustomClass()}
*
* @param string $class the class name
* @param mixed $arguments,... arguments to pass to the constructor
* @return Object
*/
public static function strong_create() {
$args = func_get_args();
$class = array_shift($args);
if(isset(self::$strong_classes[$class]) && ClassInfo::exists(self::$strong_classes[$class])) {
$class = self::$strong_classes[$class];
}
$reflector = new ReflectionClass($class);
return $reflector->newInstanceArgs($args);
}
/**
* This class allows you to overload classes with other classes when they are constructed using the factory method
* {@link Object::create()}
*
* @param string $oldClass the class to replace
* @param string $newClass the class to replace it with
* @param bool $strong allows you to enforce a certain class replacement under all circumstances. This is used in
* singletons and DB interaction classes
*/
public static function useCustomClass($oldClass, $newClass, $strong = false) {
if($strong) {
self::$strong_classes[$oldClass] = $newClass;
} else {
self::$custom_classes[$oldClass] = $newClass;
}
}
/**
* If a class has been overloaded, get the class name it has been overloaded with - otherwise return the class name
*
* @param string $class the class to check
* @return string the class that would be created if you called {@link Object::create()} with the class
*/
public static function getCustomClass($class) {
if(isset(self::$strong_classes[$class]) && ClassInfo::exists(self::$strong_classes[$class])) {
return self::$strong_classes[$class];
} elseif(isset(self::$custom_classes[$class]) && ClassInfo::exists(self::$custom_classes[$class])) {
return self::$custom_classes[$class];
}
return $class;
}
/**
* Get a static variable, taking into account SS's inbuild static caches and pseudo-statics
*
* This method first checks for any extra values added by {@link Object::add_static_var()}, and attemps to traverse
* up the extra static var chain until it reaches the top, or it reaches a replacement static.
*
* If any extra values are discovered, they are then merged with the default PHP static values, or in some cases
* completely replace the default PHP static when you set $replace = true, and do not define extra data on any child
* classes
*
* Note that from SilverStripe 2.3.2, Object::get_static() can only be used to get public
* static variables, not protected ones.
*
* @param string $class
* @param string $name the property name
* @param bool $uncached if set to TRUE, force a regeneration of the static cache
* @return mixed
*/
public static function get_static($class, $name, $uncached = false) {
if(!isset(self::$_cache_statics_prepared[$class])) {
Object::prepare_statics($class);
}
if(!isset(self::$cached_statics[$class][$name]) || $uncached) {
$extra = $builtIn = $break = $replacedAt = false;
$ancestry = array_reverse(ClassInfo::ancestry($class));
// traverse up the class tree and build extra static and stop information
foreach($ancestry as $ancestor) {
if(isset(self::$extra_statics[$ancestor][$name])) {
$toMerge = self::$extra_statics[$ancestor][$name];
if(is_array($toMerge) && is_array($extra)) {
$extra = array_merge($toMerge, $extra);
} elseif(!$extra) {
$extra = $toMerge;
} else {
$break = true;
}
if(isset(self::$replaced_statics[$ancestor][$name])) $replacedAt = $break = $ancestor;
if($break) break;
}
}
// check whether to merge in the default value
if($replacedAt && ($replacedAt == $class || !is_array($extra))) {
$value = $extra;
} elseif($replacedAt) {
// determine whether to merge in lower-class variables
$ancestorRef = new ReflectionClass(reset($ancestry));
$ancestorProps = $ancestorRef->getStaticProperties();
$ancestorInbuilt = array_key_exists($name, $ancestorProps) ? $ancestorProps[$name] : null;
$replacedRef = new ReflectionClass($replacedAt);
$replacedProps = $replacedRef->getStaticProperties();
$replacedInbuilt = array_key_exists($name, $replacedProps) ? $replacedProps[$name] : null;
if($ancestorInbuilt != $replacedInbuilt) {
$value = is_array($ancestorInbuilt) ? array_merge($ancestorInbuilt, (array) $extra) : $extra;
} else {
$value = $extra;
}
} else {
// get a built-in value
$reflector = new ReflectionClass($class);
$props = $reflector->getStaticProperties();
$inbuilt = array_key_exists($name, $props) ? $props[$name] : null;
$value = isset($extra) && is_array($extra) ? array_merge($extra, (array) $inbuilt) : $inbuilt;
}
self::$cached_statics[$class][$name] = true;
self::$statics[$class][$name] = $value;
}
return self::$statics[$class][$name];
}
/**
* Set a static variable
*
* @param string $class
* @param string $name the property name to set
* @param mixed $value
*/
public static function set_static($class, $name, $value) {
if(!isset(self::$_cache_statics_prepared[$class])) {
Object::prepare_statics($class);
}
self::$statics[$class][$name] = $value;
self::$uninherited_statics[$class][$name] = $value;
self::$cached_statics[$class][$name] = true;
self::$cached_uninherited_statics[$class][$name] = true;
}
/**
* Get an uninherited static variable - a variable that is explicity set in this class, and not in the parent class.
*
* Note that from SilverStripe 2.3.2, Object::uninherited_static() can only be used to get public
* static variables, not protected ones.
*
* @todo Recursively filter out parent statics, currently only inspects the parent class
*
* @param string $class
* @param string $name
* @return mixed
*/
public static function uninherited_static($class, $name, $uncached = false) {
if(!isset(self::$_cache_statics_prepared[$class])) {
Object::prepare_statics($class);
}
if(!isset(self::$cached_uninherited_statics[$class][$name]) || $uncached) {
$classRef = new ReflectionClass($class);
$classProp = $classRef->getStaticPropertyValue($name, null);
$parentClass = get_parent_class($class);
if($parentClass) {
$parentRef = new ReflectionClass($parentClass);
$parentProp = $parentRef->getStaticPropertyValue($name, null);
if($parentProp == $classProp) $classProp = null;
}
// Add data from extra_statics if it has been applied to this specific class (it
// wouldn't make sense to have them inherit in this method). This is kept separate
// from the equivalent get_static code because it's so much simpler
if(isset(self::$extra_statics[$class][$name])) {
$toMerge = self::$extra_statics[$class][$name];
if(is_array($toMerge) && is_array($classProp)) {
$classProp = array_merge($toMerge, $classProp);
} elseif(!$classProp) {
$classProp = $toMerge;
}
}
self::$cached_uninherited_statics[$class][$name] = true;
self::$uninherited_statics[$class][$name] = $classProp;
}
return self::$uninherited_statics[$class][$name];
}
/**
* Traverse down a class ancestry and attempt to merge all the uninherited static values for a particular static
* into a single variable
*
* @param string $class
* @param string $name the static name
* @param string $ceiling an optional parent class name to begin merging statics down from, rather than traversing
* the entire hierarchy
* @return mixed
*/
public static function combined_static($class, $name, $ceiling = false) {
$ancestry = ClassInfo::ancestry($class);
$values = null;
if($ceiling) while(current($ancestry) != $ceiling && $ancestry) {
array_shift($ancestry);
}
if($ancestry) foreach($ancestry as $ancestor) {
$merge = self::uninherited_static($ancestor, $name);
if(is_array($values) && is_array($merge)) {
$values = array_merge($values, $merge);
} elseif($merge) {
$values = $merge;
}
}
return $values;
}
/**
* Merge in a set of additional static variables
*
* @param string $class
* @param array $properties in a [property name] => [value] format
* @param bool $replace replace existing static vars
*/
public static function addStaticVars($class, $properties, $replace = false) {
foreach($properties as $prop => $value) self::add_static_var($class, $prop, $value, $replace);
}
/**
* Add a static variable without replacing it completely if possible, but merging in with both existing PHP statics
* and existing psuedo-statics. Uses PHP's array_merge_recursive() with if the $replace argument is FALSE.
*
* Documentation from http://php.net/array_merge_recursive:
* If the input arrays have the same string keys, then the values for these keys are merged together
* into an array, and this is done recursively, so that if one of the values is an array itself,
* the function will merge it with a corresponding entry in another array too.
* If, however, the arrays have the same numeric key, the later value will not overwrite the original value,
* but will be appended.
*
* @param string $class
* @param string $name the static name
* @param mixed $value
* @param bool $replace completely replace existing static values
*/
public static function add_static_var($class, $name, $value, $replace = false) {
if(is_array($value) && isset(self::$extra_statics[$class][$name]) && !$replace) {
self::$extra_statics[$class][$name] = array_merge_recursive(self::$extra_statics[$class][$name], $value);
} else {
self::$extra_statics[$class][$name] = $value;
}
if ($replace) {
self::set_static($class, $name, $value);
self::$replaced_statics[$class][$name] = true;
// Clear caches
} else {
self::$cached_statics[$class][$name] = null;
self::$cached_uninherited_statics[$class][$name] = null;
}
}
/**
* Return TRUE if a class has a specified extension
*
* @param string $class
* @param string $requiredExtension the class name of the extension to check for.
*/
public static function has_extension($class, $requiredExtension) {
$requiredExtension = strtolower($requiredExtension);
if($extensions = self::combined_static($class, 'extensions')) foreach($extensions as $extension) {
$left = strtolower(Extension::get_classname_without_arguments($extension));
$right = strtolower(Extension::get_classname_without_arguments($requiredExtension));
if($left == $right) return true;
}
return false;
}
/**
* Add an extension to a specific class.
* As an alternative, extensions can be added to a specific class
* directly in the {@link Object::$extensions} array.
* See {@link SiteTree::$extensions} for examples.
* Keep in mind that the extension will only be applied to new
* instances, not existing ones (including all instances created through {@link singleton()}).
*
* @param string $class Class that should be extended - has to be a subclass of {@link Object}
* @param string $extension Subclass of {@link Extension} with optional parameters
* as a string, e.g. "Versioned" or "Translatable('Param')"
*/
public static function add_extension($class, $extension) {
if(!preg_match('/^([^(]*)/', $extension, $matches)) {
return false;
}
$extensionClass = $matches[1];
if(!class_exists($extensionClass)) {
user_error(sprintf('Object::add_extension() - Can\'t find extension class for "%s"', $extensionClass), E_USER_ERROR);
}
if(!is_subclass_of($extensionClass, 'Extension')) {
user_error(sprintf('Object::add_extension() - Extension "%s" is not a subclass of Extension', $extensionClass), E_USER_ERROR);
}
// unset some caches
self::$cached_statics[$class]['extensions'] = null;
$subclasses = ClassInfo::subclassesFor($class);
$subclasses[] = $class;
if($subclasses) foreach($subclasses as $subclass) {
unset(self::$classes_constructed[$subclass]);
unset(self::$extra_methods[$subclass]);
}
// merge with existing static vars
$extensions = self::uninherited_static($class, 'extensions');
// We use unshift rather than push so that module extensions are added before built-in ones.
// in particular, this ensures that the Versioned rewriting is done last.
if($extensions) array_unshift($extensions, $extension);
else $extensions = array($extension);
self::set_static($class, 'extensions', $extensions);
// load statics now for DataObject classes
if(is_subclass_of($class, 'DataObject')) {
if(is_subclass_of($extensionClass, 'DataExtension')) {
DataExtension::load_extra_statics($class, $extension);
}
else {
user_error("$extensionClass cannot be applied to $class without being a DataExtension", E_USER_ERROR);
}
}
}
/**
* Prepare static variables before processing a {@link get_static} or {@link set_static}
* call.
*/
private static function prepare_statics($class) {
// _cache_statics_prepared setting must come first to prevent infinite loops when we call
// get_static below
self::$_cache_statics_prepared[$class] = true;
// load statics now for DataObject classes
if(is_subclass_of($class, 'DataObject')) {
$extensions = Object::uninherited_static($class, 'extensions');
if($extensions) {
foreach($extensions as $extension) {
$extensionClass = $extension;
if(preg_match('/^([^(]*)/', $extension, $matches)) {
$extensionClass = $matches[1];
}
if(is_subclass_of($extensionClass, 'DataExtension')) {
DataExtension::load_extra_statics($class, $extension);
}
else {
user_error("$extensionClass cannot be applied to $class without being a DataExtension", E_USER_ERROR);
}
}
}
}
}
/**
* Remove an extension from a class.
* Keep in mind that this won't revert any datamodel additions
* of the extension at runtime, unless its used before the
* schema building kicks in (in your _config.php).
* Doesn't remove the extension from any {@link Object}
* instances which are already created, but will have an
* effect on new extensions.
* Clears any previously created singletons through {@link singleton()}
* to avoid side-effects from stale extension information.
*
* @todo Add support for removing extensions with parameters
*
* @param string $class
* @param string $extension Classname of an {@link Extension} subclass, without parameters
*/
public static function remove_extension($class, $extension) {
// unload statics now for DataObject classes
if(ClassInfo::is_subclass_of($class, 'DataObject')) {
if(!preg_match('/^([^(]*)/', $extension, $matches)) {
user_error("Bad extension '$extension'", E_USER_WARNING);
} else {
$extensionClass = $matches[1];
DataObjectDecorator::unload_extra_statics($class, $extensionClass);
}
}
if(self::has_extension($class, $extension)) {
self::set_static(
$class,
'extensions',
array_diff(self::uninherited_static($class, 'extensions'), array($extension))
);
}
// unset singletons to avoid side-effects
global $_SINGLETONS;
$_SINGLETONS = array();
// unset some caches
self::$cached_statics[$class]['extensions'] = null;
$subclasses = ClassInfo::subclassesFor($class);
$subclasses[] = $class;
if($subclasses) foreach($subclasses as $subclass) {
unset(self::$classes_constructed[$subclass]);
unset(self::$extra_methods[$subclass]);
}
}
/**
* @param string $class
* @param bool $includeArgumentString Include the argument string in the return array,
* FALSE would return array("Versioned"), TRUE returns array("Versioned('Stage','Live')").
* @return array Numeric array of either {@link DataExtension} classnames,
* or eval'ed classname strings with constructor arguments.
*/
function get_extensions($class, $includeArgumentString = false) {
$extensions = self::get_static($class, 'extensions');
if($includeArgumentString) {
return $extensions;
} else {
$extensionClassnames = array();
if($extensions) foreach($extensions as $extension) {
$extensionClassnames[] = Extension::get_classname_without_arguments($extension);
}
return $extensionClassnames;
}
}
// -----------------------------------------------------------------------------------------------------------------
public function __construct() {
$this->class = get_class($this);
// Don't bother checking some classes that should never be extended
static $notExtendable = array('Object', 'ViewableData', 'RequestHandler');
if($extensionClasses = ClassInfo::ancestry($this->class)) foreach($extensionClasses as $class) {
if(in_array($class, $notExtendable)) continue;
if($extensions = self::uninherited_static($class, 'extensions')) {
foreach($extensions as $extension) {
$instance = self::create_from_string($extension);
$instance->setOwner(null, $class);
$this->extension_instances[$instance->class] = $instance;
}
}
}
if(!isset(self::$classes_constructed[$this->class])) {
$this->defineMethods();
self::$classes_constructed[$this->class] = true;
}
}
/**
* Attemps to locate and call a method dynamically added to a class at runtime if a default cannot be located
*
* You can add extra methods to a class using {@link Extensions}, {@link Object::createMethod()} or
* {@link Object::addWrapperMethod()}
*
* @param string $method
* @param array $arguments
* @return mixed
*/
public function __call($method, $arguments) {
// If the method cache was cleared by an an Object::add_extension() / Object::remove_extension()
// call, then we should rebuild it.
if(empty(self::$extra_methods[get_class($this)])) {
$this->defineMethods();
}
$method = strtolower($method);
if(isset(self::$extra_methods[$this->class][$method])) {
$config = self::$extra_methods[$this->class][$method];
switch(true) {
case isset($config['property']) :
$obj = $config['index'] !== null ?
$this->{$config['property']}[$config['index']] :
$this->{$config['property']};
if($obj) {
if(!empty($config['callSetOwnerFirst'])) $obj->setOwner($this);
$retVal = call_user_func_array(array($obj, $method), $arguments);
if(!empty($config['callSetOwnerFirst'])) $obj->clearOwner();
return $retVal;
}
if($this->destroyed) {
throw new Exception (
"Object->__call(): attempt to call $method on a destroyed $this->class object"
);
} else {
throw new Exception (
"Object->__call(): $this->class cannot pass control to $config[property]($config[index])." .
' Perhaps this object was mistakenly destroyed?'
);
}
case isset($config['wrap']) :
array_unshift($arguments, $config['method']);
return call_user_func_array(array($this, $config['wrap']), $arguments);
case isset($config['function']) :
return $config['function']($this, $arguments);
default :
throw new Exception (
"Object->__call(): extra method $method is invalid on $this->class:" . var_export($config, true)
);
}
} else {
// Please do not change the exception code number below.
throw new Exception("Object->__call(): the method '$method' does not exist on '$this->class'", 2175);
}
}
// -----------------------------------------------------------------------------------------------------------------
/**
* Return TRUE if a method exists on this object
*
* This should be used rather than PHP's inbuild method_exists() as it takes into account methods added via
* extensions
*
* @param string $method
* @return bool
*/
public function hasMethod($method) {
return method_exists($this, $method) || isset(self::$extra_methods[$this->class][strtolower($method)]);
}
/**
* Return the names of all the methods available on this object
*
* @param bool $custom include methods added dynamically at runtime
* @return array
*/
public function allMethodNames($custom = false) {
if(!isset(self::$built_in_methods[$this->class])) {
self::$built_in_methods[$this->class] = array_map('strtolower', get_class_methods($this));
}
if($custom && isset(self::$extra_methods[$this->class])) {
return array_merge(self::$built_in_methods[$this->class], array_keys(self::$extra_methods[$this->class]));
} else {
return self::$built_in_methods[$this->class];
}
}
/**
* Adds any methods from {@link Extension} instances attached to this object.
* All these methods can then be called directly on the instance (transparently
* mapped through {@link __call()}), or called explicitly through {@link extend()}.
*
* @uses addMethodsFrom()
*/
protected function defineMethods() {
if($this->extension_instances) foreach(array_keys($this->extension_instances) as $key) {
$this->addMethodsFrom('extension_instances', $key);
}
if(isset($_REQUEST['debugmethods']) && isset(self::$built_in_methods[$this->class])) {
Debug::require_developer_login();
echo '<h2>Methods defined on ' . $this->class . '</h2><ul>';
foreach(self::$built_in_methods[$this->class] as $method) {
echo "<li>$method</li>";
}
echo '</ul>';
}
}
/**
* Add all the methods from an object property (which is an {@link Extension}) to this object.
*
* @param string $property the property name
* @param string|int $index an index to use if the property is an array
*/
protected function addMethodsFrom($property, $index = null) {
$extension = ($index !== null) ? $this->{$property}[$index] : $this->$property;
if(!$extension) {
throw new InvalidArgumentException (
"Object->addMethodsFrom(): could not add methods from {$this->class}->{$property}[$index]"
);
}
if(method_exists($extension, 'allMethodNames')) {
$methods = $extension->allMethodNames(true);
} else {
if(!isset(self::$built_in_methods[$extension->class])) {
self::$built_in_methods[$extension->class] = array_map('strtolower', get_class_methods($extension));
}
$methods = self::$built_in_methods[$extension->class];
}
if($methods) {
$methodInfo = array(
'property' => $property,
'index' => $index,
'callSetOwnerFirst' => $extension instanceof Extension,
);
$newMethods = array_fill_keys($methods, $methodInfo);
if(isset(self::$extra_methods[$this->class])) {
self::$extra_methods[$this->class] =
array_merge(self::$extra_methods[$this->class], $newMethods);
} else {
self::$extra_methods[$this->class] = $newMethods;
}
}
}
/**
* Add a wrapper method - a method which points to another method with a different name. For example, Thumbnail(x)
* can be wrapped to generateThumbnail(x)
*
* @param string $method the method name to wrap
* @param string $wrap the method name to wrap to
*/
protected function addWrapperMethod($method, $wrap) {
self::$extra_methods[$this->class][strtolower($method)] = array (
'wrap' => $wrap,
'method' => $method
);
}
/**
* Add an extra method using raw PHP code passed as a string
*
* @param string $method the method name
* @param string $code the PHP code - arguments will be in an array called $args, while you can access this object
* by using $obj. Note that you cannot call protected methods, as the method is actually an external function
*/
protected function createMethod($method, $code) {
self::$extra_methods[$this->class][strtolower($method)] = array (
'function' => create_function('$obj, $args', $code)
);
}
// -----------------------------------------------------------------------------------------------------------------
/**
* @see Object::get_static()
*/
public function stat($name, $uncached = false) {
return self::get_static(($this->class ? $this->class : get_class($this)), $name, $uncached);
}
/**
* @see Object::set_static()
*/
public function set_stat($name, $value) {
self::set_static(($this->class ? $this->class : get_class($this)), $name, $value);
}
/**
* @see Object::uninherited_static()
*/
public function uninherited($name) {
return self::uninherited_static(($this->class ? $this->class : get_class($this)), $name);
}
/**
* @deprecated
*/
public function set_uninherited() {
user_error (
'Object->set_uninherited() is deprecated, please use a custom static on your object', E_USER_WARNING
);
}
// -----------------------------------------------------------------------------------------------------------------
/**
* Return true if this object "exists" i.e. has a sensible value
*
* This method should be overriden in subclasses to provide more context about the classes state. For example, a
* {@link DataObject} class could return false when it is deleted from the database
*
* @return bool
*/
public function exists() {
return true;
}
/**
* @return string this classes parent class
*/
public function parentClass() {
return get_parent_class($this);
}
/**
* Check if this class is an instance of a specific class, or has that class as one of its parents
*
* @param string $class
* @return bool
*/
public function is_a($class) {
return $this instanceof $class;
}
/**
* @return string the class name
*/
public function __toString() {
return $this->class;
}
// -----------------------------------------------------------------------------------------------------------------
/**
* Calls a method if available on both this object and all applied {@link Extensions}, and then attempts to merge
* all results into an array
*
* @param string $method the method name to call
* @param mixed $argument a single argument to pass
* @return mixed
* @todo integrate inheritance rules
*/
public function invokeWithExtensions($method, $argument = null) {
$result = method_exists($this, $method) ? array($this->$method($argument)) : array();
$extras = $this->extend($method, $argument);
return $extras ? array_merge($result, $extras) : $result;
}
/**
* Run the given function on all of this object's extensions. Note that this method originally returned void, so if
* you wanted to return results, you're hosed
*
* Currently returns an array, with an index resulting every time the function is called. Only adds returns if
* they're not NULL, to avoid bogus results from methods just defined on the parent extension. This is important for
* permission-checks through extend, as they use min() to determine if any of the returns is FALSE. As min() doesn't
* do type checking, an included NULL return would fail the permission checks.
*
* The extension methods are defined during {@link __construct()} in {@link defineMethods()}.
*
* @param string $method the name of the method to call on each extension
* @param mixed $a1,... up to 7 arguments to be passed to the method
* @return array
*/
public function extend($method, &$a1=null, &$a2=null, &$a3=null, &$a4=null, &$a5=null, &$a6=null, &$a7=null) {
$values = array();
if($this->extension_instances) foreach($this->extension_instances as $instance) {
if(method_exists($instance, $method)) {
$instance->setOwner($this);
$value = $instance->$method($a1, $a2, $a3, $a4, $a5, $a6, $a7);
if($value !== null) $values[] = $value;
$instance->clearOwner();
}
}
return $values;
}
/**
* Get an extension instance attached to this object by name.
*
* @uses hasExtension()
*
* @param string $extension
* @return Extension
*/
public function getExtensionInstance($extension) {
if($this->hasExtension($extension)) return $this->extension_instances[$extension];
}
/**
* Returns TRUE if this object instance has a specific extension applied