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GenericEvent.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\EventDispatcher;
013
014 /**
015 * Event encapsulation class.
016 *
017 * Encapsulates events thus decoupling the observer from the subject they encapsulate.
018 *
019 * @author Drak <drak@zikula.org>
020 */
021 class GenericEvent extends Event implements \ArrayAccess, \IteratorAggregate
022 {
023 /**
024 * Event subject.
025 *
026 * @var mixed usually object or callable
027 */
028 protected $subject;
029
030 /**
031 * Array of arguments.
032 *
033 * @var array
034 */
035 protected $arguments;
036
037 /**
038 * Encapsulate an event with $subject and $args.
039 *
040 * @param mixed $subject The subject of the event, usually an object.
041 * @param array $arguments Arguments to store in the event.
042 */
043 public function __construct($subject = null, array $arguments = array())
044 {
045 $this->subject = $subject;
046 $this->arguments = $arguments;
047 }
048
049 /**
050 * Getter for subject property.
051 *
052 * @return mixed $subject The observer subject.
053 */
054 public function getSubject()
055 {
056 return $this->subject;
057 }
058
059 /**
060 * Get argument by key.
061 *
062 * @param string $key Key.
063 *
064 * @throws \InvalidArgumentException If key is not found.
065 *
066 * @return mixed Contents of array key.
067 */
068 public function getArgument($key)
069 {
070 if ($this->hasArgument($key)) {
071 return $this->arguments[$key];
072 }
073
074 throw new \InvalidArgumentException(sprintf('%s not found in %s', $key, $this->getName()));
075 }
076
077 /**
078 * Add argument to event.
079 *
080 * @param string $key Argument name.
081 * @param mixed $value Value.
082 *
083 * @return GenericEvent
084 */
085 public function setArgument($key, $value)
086 {
087 $this->arguments[$key] = $value;
088
089 return $this;
090 }
091
092 /**
093 * Getter for all arguments.
094 *
095 * @return array
096 */
097 public function getArguments()
098 {
099 return $this->arguments;
100 }
101
102 /**
103 * Set args property.
104 *
105 * @param array $args Arguments.
106 *
107 * @return GenericEvent
108 */
109 public function setArguments(array $args = array())
110 {
111 $this->arguments = $args;
112
113 return $this;
114 }
115
116 /**
117 * Has argument.
118 *
119 * @param string $key Key of arguments array.
120 *
121 * @return bool
122 */
123 public function hasArgument($key)
124 {
125 return array_key_exists($key, $this->arguments);
126 }
127
128 /**
129 * ArrayAccess for argument getter.
130 *
131 * @param string $key Array key.
132 *
133 * @throws \InvalidArgumentException If key does not exist in $this->args.
134 *
135 * @return mixed
136 */
137 public function offsetGet($key)
138 {
139 return $this->getArgument($key);
140 }
141
142 /**
143 * ArrayAccess for argument setter.
144 *
145 * @param string $key Array key to set.
146 * @param mixed $value Value.
147 */
148 public function offsetSet($key, $value)
149 {
150 $this->setArgument($key, $value);
151 }
152
153 /**
154 * ArrayAccess for unset argument.
155 *
156 * @param string $key Array key.
157 */
158 public function offsetUnset($key)
159 {
160 if ($this->hasArgument($key)) {
161 unset($this->arguments[$key]);
162 }
163 }
164
165 /**
166 * ArrayAccess has argument.
167 *
168 * @param string $key Array key.
169 *
170 * @return bool
171 */
172 public function offsetExists($key)
173 {
174 return $this->hasArgument($key);
175 }
176
177 /**
178 * IteratorAggregate for iterating over the object like an array
179 *
180 * @return \ArrayIterator
181 */
182 public function getIterator()
183 {
184 return new \ArrayIterator($this->arguments);
185 }
186 }
187