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Added line numbers to debug lines as this will become the 'norm'
[hub.git] / application / hub / main / tags / package / class_PackageTags.php
1 <?php
2 /**
3  * A Package tags class
4  *
5  * @author              Roland Haeder <webmaster@ship-simu.org>
6  * @version             0.0.0
7  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2012 Hub Developer Team
8  * @license             GNU GPL 3.0 or any newer version
9  * @link                http://www.ship-simu.org
10  *
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.
15  *
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.
20  *
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/>.
23  */
24 class PackageTags extends BaseTags implements Tagable {
25         // Exception codes
26         const EXCEPTION_INVALID_TAG = 0x160;
27
28         /**
29          * Last found protocol
30          */
31         private $lastProtocol = 'invalid';
32
33         /**
34          * Last found recipient type
35          */
36         private $lastRecipientType = 'invalid';
37
38         /**
39          * Protected constructor
40          *
41          * @return      void
42          */
43         protected function __construct () {
44                 // Call parent constructor
45                 parent::__construct(__CLASS__);
46
47                 // Init the object registry
48                 $this->initObjectRegistry();
49         }
50
51         /**
52          * Creates an instance of this class
53          *
54          * @return      $tagsInstance   An instance of a Tagable class
55          */
56         public static final function createPackageTags () {
57                 // Get new instance
58                 $tagsInstance = new PackageTags();
59
60                 // Return the prepared instance
61                 return $tagsInstance;
62         }
63
64         /**
65          * Loads the XML file (our "object registry") and saves an instance for
66          * faster re-use.
67          *
68          * @return      void
69          */
70         private function initObjectRegistry () {
71                 // Output debug message
72                 self::createDebugInstance(__CLASS__)->debugOutput('TAGS[' . __LINE__ . ']: Initializing object registry - START');
73
74                 // Get the application instance
75                 $applicationInstance = Registry::getRegistry()->getInstance('app');
76
77                 // Get a XML template instance
78                 $templateInstance = XmlTemplateEngineFactory::createXmlTemplateEngineInstance('node_object_registry_template_class');
79
80                 // Set it for later use
81                 $this->setTemplateInstance($templateInstance);
82
83                 // Read the XML file
84                 $this->getTemplateInstance()->loadXmlTemplate();
85
86                 // Render the XML content
87                 $this->getTemplateInstance()->renderXmlContent();
88
89                 // Output debug message
90                 self::createDebugInstance(__CLASS__)->debugOutput('TAGS[' . __LINE__ . ']: Initializing object registry - FINISHED');
91         }
92
93         /**
94          * Extracts the tags from given package data
95          *
96          * @param       $packageData    Raw package data
97          * @return      void
98          */
99         private function extractTagsFromPackageData (array $packageData) {
100                 /*
101                  * We take a look at the tags (in most cases only one is needed) so
102                  * first we need the content data splitted up into all it's parts.
103                  */
104                 $contentData = explode(NetworkPackage::PACKAGE_MASK_SEPARATOR, $packageData[NetworkPackage::PACKAGE_DATA_CONTENT]);
105
106                 // Get the tags and store them locally
107                 $this->setTags(explode(NetworkPackage::PACKAGE_TAGS_SEPARATOR, $contentData[NetworkPackage::INDEX_TAGS]));
108         }
109
110         /**
111          * Verifies all tags by looking them up in an XML file. This method is
112          * the key method to make sure only known objects are being distributed and
113          * shared over the whole hub-network. So if the "tag" (let's better say
114          * object type) isn't found in that XML the package won't be distributed.
115          *
116          * @return      void
117          * @throws      InvalidTagException             If a provided tag from the package data is invalid
118          */
119         private function verifyAllTags () {
120                 // Get the registry
121                 $objectRegistryInstance = ObjectTypeRegistryFactory::createObjectTypeRegistryInstance();
122
123                 // "Walk" over all tags
124                 foreach ($this->getTags() as $tag) {
125                         // Debug output
126                         self::createDebugInstance(__CLASS__)->debugOutput('TAGS[' . __LINE__ . ']: Validating tag ' . $tag . ' ...');
127
128                         // Get an array from this tag
129                         $entry = $objectRegistryInstance->getArrayFromKey(XmlObjectRegistryTemplateEngine::OBJECT_TYPE_DATA_NAME, $tag);
130
131                         // If the array is empty, the entry is invalid!
132                         if (count($entry) == 0) {
133                                 // Invalid entry found
134                                 throw new InvalidTagException(array($this, $tag), self::EXCEPTION_INVALID_TAG);
135                         } // END - if
136
137                         // Now save the last discovered protocol/recipient type
138                         $this->lastProtocol      = $entry[XmlObjectRegistryTemplateEngine::OBJECT_TYPE_DATA_PROTOCOL];
139                         $this->lastRecipientType = $entry[XmlObjectRegistryTemplateEngine::OBJECT_TYPE_DATA_RECIPIENT_TYPE];
140                 } // END - foreach
141         }
142
143         /**
144          * Chooses the right protocol from given package data
145          *
146          * @param       $packageData    Raw package data
147          * @return      $protocolName   Name of the choosen procotol
148          */
149         public function chooseProtocolFromPackageData (array $packageData) {
150                 // Extract the tags
151                 $this->extractTagsFromPackageData($packageData);
152
153                 // Now we need to verify every single tag
154                 $this->verifyAllTags();
155
156                 // Use the last found protocol for transmission
157                 $protocolName = $this->lastProtocol;
158
159                 // Return it
160                 return $protocolName;
161         }
162
163         /**
164          * Checks whether the given package data is accepted by the listener
165          *
166          * @param       $packageData            Raw package data
167          * @param       $listenerInstance       A Listenable instance
168          * @return      $accepts                        Whether it is accepted
169          */
170         public function ifPackageDataIsAcceptedByListener (array $packageData, Listenable $listenerInstance) {
171                 // Extract the tags
172                 $this->extractTagsFromPackageData($packageData);
173
174                 // Now we need to verify every single tag
175                 $this->verifyAllTags();
176
177                 // Now simply check it out
178                 $accepts = (($this->lastRecipientType == $listenerInstance->getListenerType()) && ($listenerInstance->getListenerType() != 'invalid'));
179
180                 // And return the result
181                 return $accepts;
182         }
183 }
184
185 // [EOF]
186 ?>