3 * A command resolver for local (non-hubbed) commands
5 * @author Roland Haeder <webmaster@ship-simu.org>
7 * @copyright Copyright(c) 2007, 2008 Roland Haeder, this is free software
8 * @license GNU GPL 3.0 or any newer version
9 * @link http://www.ship-simu.org
11 * This program is free software: you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation, either version 3 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program. If not, see <http://www.gnu.org/licenses/>.
24 class WebCommandResolver extends BaseResolver implements CommandResolver {
26 * Last successfull resolved command
28 private $lastCommandInstance = "";
31 * Protected constructor
35 protected function __construct () {
36 // Call parent constructor
37 parent::__construct(__CLASS__);
39 // Set prefix to "Web"
40 $this->setCommandPrefix("Web");
44 * Creates an instance of a Web command resolver with a given default command
46 * @param $commandName The default command we shall execute
47 * @param $appInstance An instance of a manageable application helper class
48 * @return $resolverInstance The prepared command resolver instance
49 * @throws EmptyVariableException Thrown if the default command is not set
50 * @throws InvalidCommandException Thrown if the default command is invalid
52 public final static function createWebCommandResolver ($commandName, ManageableApplication $appInstance) {
53 // Create the new instance
54 $resolverInstance = new WebCommandResolver();
56 // Is the variable $commandName set and the command is valid?
57 if (empty($commandName)) {
58 // Then thrown an exception here
59 throw new EmptyVariableException(array($resolverInstance, 'defaultCommand'), self::EXCEPTION_UNEXPECTED_EMPTY_STRING);
60 } elseif (!$resolverInstance->isCommandValid($commandName)) {
61 // Invalid command found
62 throw new InvalidCommandException(array($resolverInstance, $commandName), self::EXCEPTION_INVALID_COMMAND);
65 // Set the application instance
66 $resolverInstance->setApplicationInstance($appInstance);
68 // Return the prepared instance
69 return $resolverInstance;
73 * Returns an command instance for a given request class or null if
74 * MissingArrayElementsException was thrown
76 * @param $requestInstance An instance of a request class
77 * @return $commandInstance An instance of the resolved command
78 * @throws InvalidCommandException Thrown if $commandName is
80 * @throws InvalidCommandInstanceException Thrown if $commandInstance
81 * is an invalid instance
83 public function resolvCommandByRequest (Requestable $requestInstance) {
86 $commandInstance = null;
88 // Test if the required parameter is set
90 // This goes fine so let's resolv the command
91 $commandName = $requestInstance->getRequestElement("page");
93 // Is the command empty? Then fall back to default command
94 if (empty($commandName)) $commandName = $this->getConfigInstance()->readConfig('default_command');
96 // Check if the command is valid
97 if (!$this->isCommandValid($commandName)) {
98 // This command is invalid!
99 throw new InvalidCommandException(array($this, $commandName), self::EXCEPTION_INVALID_COMMAND);
103 $commandInstance = $this->loadCommand($commandName);
106 if ((!is_object($commandInstance)) || (!$commandInstance instanceof Commandable)) {
107 // This command has an invalid instance!
108 throw new InvalidCommandInstanceException(array($this, $commandName), self::EXCEPTION_INVALID_COMMAND);
112 $this->lastCommandInstance = $commandInstance;
113 } catch (MissingArrayElementsException $e) {
114 // Just catch it here...
117 // Return the resolved command instance
118 return $commandInstance;
122 * Resolves the command by its direct name and returns an instance of its class
124 * @param $commandName The direct command name we shall resolve
125 * @return $commandInstance An instance of the command class
126 * @throws InvalidCommandException Thrown if $commandName is invalid
128 public function resolveCommand ($commandName) {
129 // Initiate the instance variable
130 $commandInstance = null;
132 // Is the command empty? Then fall back to default command
133 if (empty($commandName)) $commandName = $this->getConfigInstance()->readConfig('default_command');
135 // Check if the command is valid
136 if (!$this->isCommandValid($commandName)) {
137 // This command is invalid!
138 throw new InvalidCommandException(array($this, $commandName), self::EXCEPTION_INVALID_COMMAND);
142 $commandInstance = $this->loadCommand($commandName);
144 // Return the instance
145 return $commandInstance;
149 * "Loads" a given command and instances it if not yet cached
151 * @param $commandName A command name we shall look for
152 * @return $commandInstance A loaded command instance
153 * @throws InvalidCommandException Thrown if even the default
154 * command class is missing (bad!)
156 private function loadCommand ($commandName) {
157 // Cache default command
158 $defaultCommand = $this->getConfigInstance()->readConfig('default_command');
160 // Init command instance
161 $commandInstance = null;
163 // Create command class name
164 $className = sprintf("Web%sCommand",
165 $this->convertToClassName($commandName)
168 // Is this class loaded?
169 if (!class_exists($className)) {
170 // Class not found, so try the default one or throw exception
171 if ($commandName != $defaultCommand) {
172 // Try the default command
173 return $this->loadCommand($defaultCommand);
176 throw new InvalidCommandException(array($this, $defaultCommand), self::EXCEPTION_INVALID_COMMAND);
180 // Initiate the command
181 $commandInstance = ObjectFactory::createObjectByName($className, array($this));
184 return $commandInstance;