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Interfaces

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  1: <?php
  2: 
  3: /**
  4:  * This file is part of the Nette Framework (http://nette.org)
  5:  *
  6:  * Copyright (c) 2004 David Grudl (http://davidgrudl.com)
  7:  *
  8:  * For the full copyright and license information, please view
  9:  * the file license.txt that was distributed with this source code.
 10:  * @package Nette\ComponentModel
 11:  */
 12: 
 13: 
 14: 
 15: /**
 16:  * Component is the base class for all components.
 17:  *
 18:  * Components are objects implementing IComponent. They has parent component and own name.
 19:  *
 20:  * @author     David Grudl
 21:  *
 22:  * @property-read string $name
 23:  * @property-read IComponentContainer|NULL $parent
 24:  * @package Nette\ComponentModel
 25:  */
 26: abstract class NComponent extends NObject implements IComponent
 27: {
 28:     /** @var IComponentContainer */
 29:     private $parent;
 30: 
 31:     /** @var string */
 32:     private $name;
 33: 
 34:     /** @var array of [type => [obj, depth, path, is_monitored?]] */
 35:     private $monitors = array();
 36: 
 37: 
 38: 
 39:     /**
 40:      */
 41:     public function __construct(IComponentContainer $parent = NULL, $name = NULL)
 42:     {
 43:         if ($parent !== NULL) {
 44:             $parent->addComponent($this, $name);
 45: 
 46:         } elseif (is_string($name)) {
 47:             $this->name = $name;
 48:         }
 49:     }
 50: 
 51: 
 52: 
 53:     /**
 54:      * Lookup hierarchy for component specified by class or interface name.
 55:      * @param  string class/interface type
 56:      * @param  bool   throw exception if component doesn't exist?
 57:      * @return IComponent
 58:      */
 59:     public function lookup($type, $need = TRUE)
 60:     {
 61:         if (!isset($this->monitors[$type])) { // not monitored or not processed yet
 62:             $obj = $this->parent;
 63:             $path = self::NAME_SEPARATOR . $this->name;
 64:             $depth = 1;
 65:             while ($obj !== NULL) {
 66:                 if ($obj instanceof $type) {
 67:                     break;
 68:                 }
 69:                 $path = self::NAME_SEPARATOR . $obj->getName() . $path;
 70:                 $depth++;
 71:                 $obj = $obj->getParent(); // IComponent::getParent()
 72:                 if ($obj === $this) {
 73:                     $obj = NULL; // prevent cycling
 74:                 }
 75:             }
 76: 
 77:             if ($obj) {
 78:                 $this->monitors[$type] = array($obj, $depth, substr($path, 1), FALSE);
 79: 
 80:             } else {
 81:                 $this->monitors[$type] = array(NULL, NULL, NULL, FALSE); // not found
 82:             }
 83:         }
 84: 
 85:         if ($need && $this->monitors[$type][0] === NULL) {
 86:             throw new InvalidStateException("Component '$this->name' is not attached to '$type'.");
 87:         }
 88: 
 89:         return $this->monitors[$type][0];
 90:     }
 91: 
 92: 
 93: 
 94:     /**
 95:      * Lookup for component specified by class or interface name. Returns backtrace path.
 96:      * A path is the concatenation of component names separated by self::NAME_SEPARATOR.
 97:      * @param  string class/interface type
 98:      * @param  bool   throw exception if component doesn't exist?
 99:      * @return string
100:      */
101:     public function lookupPath($type, $need = TRUE)
102:     {
103:         $this->lookup($type, $need);
104:         return $this->monitors[$type][2];
105:     }
106: 
107: 
108: 
109:     /**
110:      * Starts monitoring.
111:      * @param  string class/interface type
112:      * @return void
113:      */
114:     public function monitor($type)
115:     {
116:         if (empty($this->monitors[$type][3])) {
117:             if ($obj = $this->lookup($type, FALSE)) {
118:                 $this->attached($obj);
119:             }
120:             $this->monitors[$type][3] = TRUE; // mark as monitored
121:         }
122:     }
123: 
124: 
125: 
126:     /**
127:      * Stops monitoring.
128:      * @param  string class/interface type
129:      * @return void
130:      */
131:     public function unmonitor($type)
132:     {
133:         unset($this->monitors[$type]);
134:     }
135: 
136: 
137: 
138:     /**
139:      * This method will be called when the component (or component's parent)
140:      * becomes attached to a monitored object. Do not call this method yourself.
141:      * @param  IComponent
142:      * @return void
143:      */
144:     protected function attached($obj)
145:     {
146:     }
147: 
148: 
149: 
150:     /**
151:      * This method will be called before the component (or component's parent)
152:      * becomes detached from a monitored object. Do not call this method yourself.
153:      * @param  IComponent
154:      * @return void
155:      */
156:     protected function detached($obj)
157:     {
158:     }
159: 
160: 
161: 
162:     /********************* interface IComponent ****************d*g**/
163: 
164: 
165: 
166:     /**
167:      * @return string
168:      */
169:     final public function getName()
170:     {
171:         return $this->name;
172:     }
173: 
174: 
175: 
176:     /**
177:      * Returns the container if any.
178:      * @return IComponentContainer|NULL
179:      */
180:     final public function getParent()
181:     {
182:         return $this->parent;
183:     }
184: 
185: 
186: 
187:     /**
188:      * Sets the parent of this component. This method is managed by containers and should
189:      * not be called by applications
190:      * @param  IComponentContainer  New parent or null if this component is being removed from a parent
191:      * @param  string
192:      * @return NComponent  provides a fluent interface
193:      * @throws InvalidStateException
194:      * @internal
195:      */
196:     public function setParent(IComponentContainer $parent = NULL, $name = NULL)
197:     {
198:         if ($parent === NULL && $this->parent === NULL && $name !== NULL) {
199:             $this->name = $name; // just rename
200:             return $this;
201: 
202:         } elseif ($parent === $this->parent && $name === NULL) {
203:             return $this; // nothing to do
204:         }
205: 
206:         // A component cannot be given a parent if it already has a parent.
207:         if ($this->parent !== NULL && $parent !== NULL) {
208:             throw new InvalidStateException("Component '$this->name' already has a parent.");
209:         }
210: 
211:         // remove from parent?
212:         if ($parent === NULL) {
213:             $this->refreshMonitors(0);
214:             $this->parent = NULL;
215: 
216:         } else { // add to parent
217:             $this->validateParent($parent);
218:             $this->parent = $parent;
219:             if ($name !== NULL) {
220:                 $this->name = $name;
221:             }
222: 
223:             $tmp = array();
224:             $this->refreshMonitors(0, $tmp);
225:         }
226:         return $this;
227:     }
228: 
229: 
230: 
231:     /**
232:      * Is called by a component when it is about to be set new parent. Descendant can
233:      * override this method to disallow a parent change by throwing an InvalidStateException
234:      * @return void
235:      * @throws InvalidStateException
236:      */
237:     protected function validateParent(IComponentContainer $parent)
238:     {
239:     }
240: 
241: 
242: 
243:     /**
244:      * Refreshes monitors.
245:      * @param  int
246:      * @param  array|NULL (array = attaching, NULL = detaching)
247:      * @param  array
248:      * @return void
249:      */
250:     private function refreshMonitors($depth, & $missing = NULL, & $listeners = array())
251:     {
252:         if ($this instanceof IComponentContainer) {
253:             foreach ($this->getComponents() as $component) {
254:                 if ($component instanceof NComponent) {
255:                     $component->refreshMonitors($depth + 1, $missing, $listeners);
256:                 }
257:             }
258:         }
259: 
260:         if ($missing === NULL) { // detaching
261:             foreach ($this->monitors as $type => $rec) {
262:                 if (isset($rec[1]) && $rec[1] > $depth) {
263:                     if ($rec[3]) { // monitored
264:                         $this->monitors[$type] = array(NULL, NULL, NULL, TRUE);
265:                         $listeners[] = array($this, $rec[0]);
266:                     } else { // not monitored, just randomly cached
267:                         unset($this->monitors[$type]);
268:                     }
269:                 }
270:             }
271: 
272:         } else { // attaching
273:             foreach ($this->monitors as $type => $rec) {
274:                 if (isset($rec[0])) { // is in cache yet
275:                     continue;
276: 
277:                 } elseif (!$rec[3]) { // not monitored, just randomly cached
278:                     unset($this->monitors[$type]);
279: 
280:                 } elseif (isset($missing[$type])) { // known from previous lookup
281:                     $this->monitors[$type] = array(NULL, NULL, NULL, TRUE);
282: 
283:                 } else {
284:                     $this->monitors[$type] = NULL; // forces re-lookup
285:                     if ($obj = $this->lookup($type, FALSE)) {
286:                         $listeners[] = array($this, $obj);
287:                     } else {
288:                         $missing[$type] = TRUE;
289:                     }
290:                     $this->monitors[$type][3] = TRUE; // mark as monitored
291:                 }
292:             }
293:         }
294: 
295:         if ($depth === 0) { // call listeners
296:             $method = $missing === NULL ? 'detached' : 'attached';
297:             foreach ($listeners as $item) {
298:                 $item[0]->$method($item[1]);
299:             }
300:         }
301:     }
302: 
303: 
304: 
305:     /********************* cloneable, serializable ****************d*g**/
306: 
307: 
308: 
309:     /**
310:      * Object cloning.
311:      */
312:     public function __clone()
313:     {
314:         if ($this->parent === NULL) {
315:             return;
316: 
317:         } elseif ($this->parent instanceof NComponentContainer) {
318:             $this->parent = $this->parent->_isCloning();
319:             if ($this->parent === NULL) { // not cloning
320:                 $this->refreshMonitors(0);
321:             }
322: 
323:         } else {
324:             $this->parent = NULL;
325:             $this->refreshMonitors(0);
326:         }
327:     }
328: 
329: 
330: 
331:     /**
332:      * Prevents serialization.
333:      */
334:     final public function __sleep()
335:     {
336:         throw new NotImplementedException('Object serialization is not supported by class ' . get_class($this));
337:     }
338: 
339: 
340: 
341:     /**
342:      * Prevents unserialization.
343:      */
344:     final public function __wakeup()
345:     {
346:         throw new NotImplementedException('Object unserialization is not supported by class ' . get_class($this));
347:     }
348: 
349: }
350: 
Nette Framework 2.0.7 (for PHP 5.2, prefixed) API API documentation generated by ApiGen 2.8.0