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Diffstat (limited to 'engine/lib/opendd.php')
| -rw-r--r-- | engine/lib/opendd.php | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/engine/lib/opendd.php b/engine/lib/opendd.php new file mode 100644 index 000000000..0f4955448 --- /dev/null +++ b/engine/lib/opendd.php @@ -0,0 +1,306 @@ +<?php + /** + * OpenDD PHP Library. + * + * @package Elgg + * @subpackage Core + * @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2 + * @author Marcus Povey + * @copyright Curverider Ltd 2008 + * @link http://elgg.org/ + */ + + /** + * @class ODDDocument ODD Document container. + * This class is used during import and export to construct. + * @author Marcus Povey + */ + class ODDDocument implements Iterator + { + /** + * ODD Version + * + * @var string + */ + private $ODDSupportedVersion = "1.0"; + + /** + * Elements of the document. + */ + private $elements; + + public function __construct(array $elements = NULL) + { + if ($elements) + $this->elements = $elements; + else + $this->elements = array(); + } + + /** + * Return the version of ODD being used. + * + * @return string + */ + public function getVersion() { return $this->ODDSupportedVersion; } + + public function addElement(ODD $element) { $this->elements[] = $element; } + public function addElements(array $elements) + { + foreach ($elements as $element) + $this->addElement($element); + } + + public function getElements() { return $this->elements; } + + /** + * Magic function to generate valid ODD XML for this item. + */ + public function __toString() + { + $xml = ""; + + // Output begin tag + $generated = date("r"); + $xml .= "<odd version=\"{$this->ODDSupportedVersion}\" generated=\"$generated\">\n"; + + // Get XML for elements + foreach ($this->elements as $element) + $xml .= "$element"; + + // Output end tag + $xml .= "</odd>\n"; + + return $xml; + } + + // ITERATOR INTERFACE ////////////////////////////////////////////////////////////// + /* + * This lets an entity's attributes be displayed using foreach as a normal array. + * Example: http://www.sitepoint.com/print/php5-standard-library + */ + + private $valid = FALSE; + + function rewind() + { + $this->valid = (FALSE !== reset($this->elements)); + } + + function current() + { + return current($this->elements); + } + + function key() + { + return key($this->elements); + } + + function next() + { + $this->valid = (FALSE !== next($this->elements)); + } + + function valid() + { + return $this->valid; + } + } + + /** + * Open Data Definition (ODD) superclass. + * @package Elgg + * @subpackage Core + * @author Marcus Povey + */ + abstract class ODD + { + /** + * Attributes. + */ + private $attributes = array(); + + /** + * Optional body. + */ + private $body; + + /** + * Construct an ODD document with initial values. + */ + public function __construct() + { + $this->body = ""; + } + + public function setAttribute($key, $value) { $this->attributes[$key] = $value; } + public function getAttribute($key) + { + if (isset($this->attributes[$key])) + return $this->attributes[$key]; + + return NULL; + } + public function setBody($value) { $this->body = $value; } + public function getBody() { return $this->body; } + + /** + * For serialisation, implement to return a string name of the tag eg "header" or "metadata". + * @return string + */ + abstract protected function getTagName(); + + /** + * Magic function to generate valid ODD XML for this item. + */ + public function __toString() + { + // Construct attributes + $attr = ""; + foreach ($this->attributes as $k => $v) + $attr .= ($v!="") ? "$k=\"$v\" " : ""; + + $body = $this->getBody(); + $tag = $this->getTagName(); + + $end = "/>"; + if ($body!="") + $end = ">$body</{$tag}>"; + + return "<{$tag} $attr" . $end . "\n"; + } + } + + /** + * ODD Entity class. + * @package Elgg + * @subpackage Core + * @author Marcus Povey + */ + class ODDEntity extends ODD + { + function __construct($uuid, $class, $subclass = "") + { + parent::__construct(); + + $this->setAttribute('uuid', $uuid); + $this->setAttribute('class', $class); + $this->setAttribute('subclass', $subclass); + } + + protected function getTagName() { return "entity"; } + } + + /** + * ODD Metadata class. + * @package Elgg + * @subpackage Core + * @author Marcus Povey + */ + class ODDMetaData extends ODD + { + function __construct($uuid, $entity_uuid, $name, $value, $type = "", $owner_uuid = "") + { + parent::__construct(); + + $this->setAttribute('uuid', $uuid); + $this->setAttribute('entity_uuid', $entity_uuid); + $this->setAttribute('name', $name); + $this->setAttribute('type', $type); + $this->setAttribute('owner_uuid', $owner_uuid); + $this->setBody($value); + } + + protected function getTagName() { return "metadata"; } + } + + /** + * ODD Relationship class. + * @package Elgg + * @subpackage Core + * @author Marcus Povey + */ + class ODDRelationship extends ODD + { + function __construct($uuid1, $type, $uuid2) + { + parent::__construct(); + + $this->setAttribute('uuid1', $uuid1); + $this->setAttribute('type', $type); + $this->setAttribute('uuid2', $uuid2); + } + + protected function getTagName() { return "relationship"; } + } + + /** + * Attempt to construct an ODD object out of a XmlElement or sub-elements. + * + * @param XmlElement $element The element(s) + * @return mixed An ODD object if the element can be handled, or false. + */ + function ODD_factory(XmlElement $element) + { + $name = $element->name; + $odd = false; + + switch ($name) + { + case 'entity' : $odd = new ODDEntity("","",""); break; + case 'metadata' : $odd = new ODDMetaData("","","",""); break; + case 'relationship' : $odd = new ODDRelationship("","",""); break; + } + + // Now populate values + if ($odd) + { + // Attributes + foreach ($element->attributes as $k => $v) + $odd->setAttribute($k,$v); + + // Body + $odd->setBody($element->content); + } + + return $odd; + } + + /** + * Import an ODD document. + * + * @param string $xml The XML ODD. + * @return ODDDocument + */ + function ODD_Import($xml) + { + // Parse XML to an array + $elements = xml_2_object($xml); + + // Create ODDDocument + $document = new ODDDocument(); + + // Itterate through array of elements and construct ODD document + foreach ($elements->children as $child) + { + $odd = ODD_factory($child); + + if ($odd) + $document->addElement($odd); + } + + return $document; + } + + /** + * Export an ODD Document. + * + * @param ODDDocument $document The Document. + */ + function ODD_Export(ODDDocument $document) + { + return "$document"; + } + +?>
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