-
Notifications
You must be signed in to change notification settings - Fork 238
/
Entity.php
465 lines (423 loc) · 13.2 KB
/
Entity.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
<?php
/**
* Lithium: the most rad php framework
*
* @copyright Copyright 2010, Union of RAD (http://union-of-rad.org)
* @license http://opensource.org/licenses/bsd-license.php The BSD License
*/
namespace lithium\data;
use BadMethodCallException;
use UnexpectedValueException;
use lithium\data\Source;
use lithium\util\Collection as Col;
/**
* `Entity` is a smart data object which represents data such as a row or document in a
* database. Entities have fields (often known as columns in databases), and track changes to its
* fields, as well as associated validation errors, etc.
*
* The `Entity` class can also be used as a base class for your own custom data objects, and is the
* basis for generating forms with the `Form` helper.
*
* @see lithium\template\helper\Form
*/
class Entity extends \lithium\core\Object {
/**
* Fully-namespaced class name of model that this record is bound to. Instance methods declared
* in the model may be called on the entity. See the `Model` class documentation for more
* information.
*
* @see lithium\data\Model
* @see lithium\data\Entity::__call()
* @var string
*/
protected $_model = null;
/**
* Associative array of the entity's fields and values.
*
* @var array
*/
protected $_data = array();
/**
* An array containing all related records and recordsets, keyed by relationship name, as
* defined in the bound model class.
*
* @var array
*/
protected $_relationships = array();
/**
* If this record is chained off of another, contains the origin object.
*
* @var object
*/
protected $_parent = null;
/**
* A reference to the object that originated this record set; usually an instance of
* `lithium\data\Source` or `lithium\data\source\Database`. Used to load column definitions and
* lazy-load records.
*
* @var object
*/
protected $_handle = null;
/**
* The list of validation errors associated with this object, where keys are field names, and
* values are arrays containing one or more validation error messages.
*
* @see lithium\data\Entity::errors()
* @var array
*/
protected $_errors = array();
/**
* Contains the values of updated fields. These values will be persisted to the backend data
* store when the document is saved.
*
* @var array
*/
protected $_updated = array();
/**
* An array of key/value pairs corresponding to fields that should be updated using atomic
* incrementing / decrementing operations. Keys match field names, and values indicate the value
* each field should be incremented or decrememnted by.
*
* @see lithium\data\Entity::increment()
* @see lithium\data\Entity::decrement()
* @var array
*/
protected $_increment = array();
/**
* A flag indicating whether or not this entity exists. Set to `false` if this is a
* newly-created entity, or if this entity has been loaded and subsequently deleted. Set to
* `true` if the entity has been loaded from the database, or has been created and subsequently
* saved.
*
* @var boolean
*/
protected $_exists = false;
/**
* A local copy of the schema definition. This is the same as `lithium\data\Model::$_schema`,
* but can be defined here if this is a one-off object or class used for a single purpose, i.e.
* to create a form.
*
* @var array
*/
protected $_schema = array();
/**
* Auto configuration.
*
* @var array
*/
protected $_autoConfig = array(
'classes' => 'merge', 'parent', 'schema', 'data', 'model', 'exists', 'pathKey'
);
/**
* Creates a new record object with default values.
*
* Options defined:
* - 'data' _array_: Data to enter into the record. Defaults to an empty array.
* - 'model' _string_: Class name that provides the data-source for this record.
* Defaults to `null`.
*
* @param array $config
* @return object Record object.
*/
public function __construct(array $config = array()) {
$defaults = array('model' => null, 'data' => array());
parent::__construct($config + $defaults);
}
/**
* Overloading for reading inaccessible properties.
*
* @param string $name Property name.
* @return mixed Result.
*/
public function &__get($name) {
$data = null;
$null = null;
if (isset($this->_relationships[$name])) {
return $this->_relationships[$name];
}
if (($model = $this->_model) && $this->_handle) {
foreach ($model::relations() as $relation => $config) {
$linkKey = $config->data('fieldName');
$type = $config->data('type') == 'hasMany' ? 'set' : 'entity';
$class = $this->_classes[$type];
if ($linkKey === $name) {
$data = isset($this->_data[$name]) ? $this->_data[$name] : array();
$this->_relationships[$name] = new $class();
return $this->_relationships[$name];
}
}
}
if (isset($this->_updated[$name])) {
return $this->_updated[$name];
}
if (isset($this->_data[$name])) {
return $this->_data[$name];
}
return $null;
}
/**
* Overloading for writing to inaccessible properties.
*
* @param string $name Property name.
* @param string $value Property value.
* @return mixed Result.
*/
public function __set($name, $value = null) {
if (is_array($name) && !$value) {
return array_map(array(&$this, '__set'), array_keys($name), array_values($name));
}
$this->_updated[$name] = $value;
}
/**
* Overloading for calling `isset()` or `empty()` on inaccessible properties.
*
* @param string $name Property name.
* @return mixed Result.
*/
public function __isset($name) {
return isset($this->_data[$name]) || isset($this->_updated[$name]);
}
/**
* Magic method that allows calling of model methods on this record instance, i.e.:
* {{{
* $record->validates();
* }}}
*
* @param string $method
* @param array $params
* @return mixed
*/
public function __call($method, $params) {
if (!($model = $this->_model) || !method_exists($model, $method)) {
$message = "No model bound or unhandled method call `{$method}`.";
throw new BadMethodCallException($message);
}
array_unshift($params, $this);
$class = $model::invokeMethod('_object');
return call_user_func_array(array(&$class, $method), $params);
}
/**
* Allows several properties to be assigned at once, i.e.:
* {{{
* $record->set(array('title' => 'Lorem Ipsum', 'value' => 42));
* }}}
*
* @param $values An associative array of fields and values to assign to the `Record`.
* @return void
*/
public function set($values) {
foreach ($values as $name => $value) {
$this->__set($name, $value);
}
}
/**
* Access the data fields of the record. Can also access a $named field.
*
* @param string $name Optionally included field name.
* @return array|string Entire data array if $name is empty, otherwise the value from the named
* field.
*/
public function data($name = null) {
if ($name) {
return $this->__get($name);
}
return $this->_updated + $this->_data;
}
/**
* Returns the model which this entity is bound to.
*
* @return string The fully qualified model class name.
*/
public function model() {
return $this->_model;
}
public function schema($field = null) {
$schema = array();
switch (true) {
case ($this->_schema):
$schema = $this->_schema;
break;
case ($model = $this->_model):
$schema = $model::schema();
break;
}
if ($field) {
return isset($schema[$field]) ? $schema[$field] : null;
}
return $schema;
}
/**
* Access the errors of the record.
*
* @see lithium\data\Entity::$_errors
* @param array|string $field If an array, overwrites `$this->_errors`. If a string, and
* `$value` is not `null`, sets the corresponding key in `$this->_errors` to `$value`.
* @param string $value Value to set.
* @return array|string Either the `$this->_errors` array, or single value from it.
*/
public function errors($field = null, $value = null) {
if ($field === null) {
return $this->_errors;
}
if (is_array($field)) {
return ($this->_errors = $field);
}
if ($value === null && isset($this->_errors[$field])) {
return $this->_errors[$field];
}
if ($value !== null) {
return $this->_errors[$field] = $value;
}
return $value;
}
/**
* A flag indicating whether or not this record exists.
*
* @return boolean `True` if the record was `read` from the data-source, or has been `create`d
* and `save`d. Otherwise `false`.
*/
public function exists() {
return $this->_exists;
}
/**
* Called after an `Entity` is saved. Updates the object's internal state to reflect the
* corresponding database entity, and sets the `Entity` object's key, if this is a newly-created
* object.
*
* @param mixed $id The ID to assign, where applicable.
* @param array $data Any additional generated data assigned to the object by the database.
* @return void
*/
public function update($id = null, array $data = array()) {
$this->_exists = true;
$model = $this->_model;
$key = array();
if ($id && $model) {
$key = $model::meta('key');
$key = is_array($key) ? array_combine($key, $id) : array($key => $id);
}
$this->_data = ($key + $data + $this->_updated + $this->_data);
$this->_updated = array();
}
/**
* Safely (atomically) increments the value of the specified field by an arbitrary value.
* Defaults to `1` if no value is specified. Throws an exception if the specified field is
* non-numeric.
*
* @param string $field The name of the field to be incrememnted.
* @param string $value The value to increment the field by. Defaults to `1` if this parameter
* is not specified.
* @return integer Returns the current value of `$field`, based on the value retrieved from the
* data source when the entity was loaded, plus any increments applied. Note that it may
* not reflect the most current value in the persistent backend data source.
* @throws UnexpectedValueException Throws an exception when `$field` is set to a non-numeric
* type.
*/
public function increment($field, $value = 1) {
if (!isset($this->_data[$field])) {
return $this->_data[$field] = $value;
}
if (!is_numeric($this->_data[$field])) {
throw new UnexpectedValueException("Field '{$field}' cannot be incremented.");
}
$base = isset($this->_updated[$field]) ? $this->_updated[$field] : $this->_data[$field];
return $this->_updated[$field] = ($base + $value);
}
/**
* Decrements a field by the specified value. Works identically to `increment()`, but in
* reverse.
*
* @see lithium\data\Entity::increment()
* @param string $field The name of the field to decrement.
* @param string $value The value by which to decrement the field. Defaults to `1`.
* @return integer Returns the new value of `$field`, after modification.
*/
public function decrement($field, $value = 1) {
return $this->increment($field, $value * -1);
}
/**
* Gets the array of fields modified on this entity.
*
* @return array Returns an array where the keys are entity field names, and the values are
* always `true`.
*/
public function modified() {
if (!$this->_exists) {
$keys = array_keys($this->_data);
return array_combine($keys, array_fill(0, count($keys), true));
}
return $this->_modified;
}
public function export() {
return array(
'exists' => $this->_exists,
'data' => $this->_data,
'update' => $this->_updated,
'increment' => $this->_increment,
);
}
/**
* Configures protected properties of a `Record` so that it is parented to `$parent`.
*
* @param object $parent
* @param array $config
* @return void
*/
public function assignTo($parent, array $config = array()) {
foreach ($config as $key => $val) {
$this->{'_' . $key} = $val;
}
$this->_parent =& $parent;
}
/**
* Converts the data in the record set to a different format, i.e. an array.
*
* @param string $format currently only `array`
* @param array $options
* @return mixed
*/
public function to($format, array $options = array()) {
switch ($format) {
case 'array':
$result = Col::toArray($this->data());
break;
default:
$result = $this;
break;
}
return $result;
}
/**
* Instantiates a new `Entity` object as a descendant of the current object, and sets all
* default values and internal state.
*
* @param string $classType The type of class to create, either `'entity'` or `'set'`.
* @param string $key The key name to which the related object is assigned.
* @param array $data The internal data of the related object.
* @param array $options Any other options to pass when instantiating the related object.
* @return object Returns a new `Entity` object instance.
*/
protected function _relation($classType, $key, $data, $options = array()) {
$parent = $this;
$key = ($key === null) ? count($this->_data) : $key;
$pathKey = trim("{$this->_pathKey}.{$key}", '.');
if (($key || $key === 0) && $model = $this->_model) {
foreach ($model::relations() as $name => $relation) {
if ($key === $relation->data('fieldName')) {
$model = $relation->data('to');
break;
}
}
}
if (is_object($data) && method_exists($data, 'assignTo')) {
$data->assignTo($this, compact('model', 'pathKey'));
return $data;
}
if ($model) {
$exists = $this->_exists;
$options += compact('parent', 'exists', 'pathKey');
return $model::connection()->cast($this, $data, $options);
}
}
}
?>