+<?php
+/**
+ * A command resolver for local (non-hubbed) commands
+ *
+ * @author Roland Haeder <webmaster@ship-simu.org>
+ * @version 0.0.0
+ * @copyright Copyright(c) 2007, 2008 Roland Haeder, this is free software
+ * @license GNU GPL 3.0 or any newer version
+ * @link http://www.ship-simu.org
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+class LocalCommandResolver extends BaseResolver implements CommandResolver {
+ /**
+ * Last successfull resolved command
+ */
+ private $lastCommandInstance = "";
+
+ /**
+ * Private constructor
+ *
+ * @return void
+ */
+ protected function __construct () {
+ // Call parent constructor
+ parent::__construct(__CLASS__);
+
+ // Set part description
+ $this->setObjectDescription("Lokaler Kommandoauflöser");
+
+ // Create unique ID number
+ $this->createUniqueID();
+
+ // Clean up a little
+ $this->removeNumberFormaters();
+ $this->removeSystemArray();
+
+ // Set prefix to "Local"
+ $this->setCommandPrefix("Local");
+ }
+
+ /**
+ * Creates an instance of a local command resolver with a given default command
+ *
+ * @param $defaultCommand The default command we shall execute
+ * @param $appInstance An instance of a manageable application helper class
+ * @return $resolverInstance The prepared command resolver instance
+ * @throws EmptyVariableException Thrown if the default command is not set
+ * @throws InvalidCommandException Thrown if the default command is invalid
+ */
+ public final static function createLocalCommandResolver ($defaultCommand, ManageableApplication $appInstance) {
+ // Create the new instance
+ $resolverInstance = new LocalCommandResolver();
+
+ // Is the variable $defaultCommand set and the command is valid?
+ if (empty($defaultCommand)) {
+ // Then thrown an exception here
+ throw new EmptyVariableException(array($resolverInstance, 'defaultCommand'), self::EXCEPTION_UNEXPECTED_EMPTY_STRING);
+ } elseif (!$resolverInstance->isCommandValid($defaultCommand)) {
+ // Invalid command found
+ throw new InvalidCommandException(array($resolverInstance, $defaultCommand), self::EXCEPTION_INVALID_COMMAND);
+ }
+
+ // Set the application instance
+ $resolverInstance->setApplicationInstance($appInstance);
+
+ // Return the prepared instance
+ return $resolverInstance;
+ }
+
+ /**
+ * Returns an command instance for a given request class or null if
+ * MissingArrayElementsException was thrown
+ *
+ * @param $requestInstance An instance of a request class
+ * @return $commandInstance An instance of the resolved command
+ * @throws InvalidCommandException Thrown if $commandName is
+ * invalid
+ * @throws InvalidCommandInstanceException Thrown if $commandInstance
+ * is an invalid instance
+ */
+ public function resolvCommandByRequest (Requestable $requestInstance) {
+ // Init variables
+ $commandName = "";
+ $commandInstance = null;
+
+ // Test if the required parameter is set
+ try {
+ // This goes fine so let's resolv the command
+ $commandName = $requestInstance->getRequestElement($this->getConfigInstance()->readConfig("command_parameter"));
+
+ // Is the command empty? Then fall back to default command
+ if (empty($commandName)) $commandName = $this->getConfigInstance()->readConfig("default_command");
+
+ // Check if the command is valid
+ if (!$this->isCommandValid($commandName)) {
+ // This command is invalid!
+ throw new InvalidCommandException(array($this, $commandName), self::EXCEPTION_INVALID_COMMAND);
+ }
+
+ // Get the command
+ $commandInstance = $this->loadCommand($commandName);
+
+ // And validate it
+ if ((!is_object($commandInstance)) || (!$commandInstance instanceof Commandable)) {
+ // This command has an invalid instance!
+ throw new InvalidCommandInstanceException(array($this, $commandName), self::EXCEPTION_INVALID_COMMAND);
+ }
+
+ // Set last command
+ $this->lastCommandInstance = $commandInstance;
+ } catch (MissingArrayElementsException $e) {
+ // Just catch it here...
+ }
+
+ // Return the resolved command instance
+ return $commandInstance;
+ }
+
+ /**
+ * "Loads" a given command and instances it if not yet cached
+ *
+ * @param $commandName A command name we shall look for
+ * @return $commandInstance A loaded command instance
+ * @throws InvalidCommandException Thrown if even the default
+ * command class is missing (bad!)
+ */
+ private function loadCommand ($commandName) {
+ // Cache default command
+ $defaultCommand = $this->getConfigInstance()->readConfig("default_command");
+
+ // Init command instance
+ $commandInstance = null;
+
+ // Create command class name
+ $class = sprintf("Local%sCommand",
+ ucfirst(strtolower($commandName))
+ );
+
+ // Is this class loaded?
+ if (!class_exists($class)) {
+ // Class not found, so try the default one or throw exception
+ if ($commandName != $defaultCommand) {
+ // Try the default command
+ return $this->loadCommand($defaultCommand);
+ } else {
+ // Still not found?
+ throw new InvalidCommandException(array($this, $defaultCommand), self::EXCEPTION_INVALID_COMMAND);
+ }
+ }
+
+ // Initiate the command
+ $eval = sprintf("\$commandInstance = %s::create%s(\$this);",
+ $class,
+ $class
+ );
+
+ // Run the command
+ eval($eval);
+
+ // Is the instance valid?
+ if ((!is_object($commandInstance)) || (!$commandInstance instanceof Commandable)) {
+ // Something is wrong
+ $commandInstance = null;
+ }
+
+ // Return the result
+ return $commandInstance;
+ }
+}
+
+// [EOF]
+?>
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