source: Dev/trunk/rdfapi/syntax/JsonParser.php @ 12

<?php
/**
 * This class provides capabilities to parse json encoded rdf models.
 *
 * @package syntax
 * @author Philipp Frischmuth <philipp@frischmuth24.de>
 * @version $Id: JsonParser.php 555 2007-12-11 20:27:34Z p_frischmuth $
 */
class JsonParser extends Object {
        
        /**
         * This method takes a json encoded rdf-model and a reference to aa (usually empty) MemModel, parses the json
         * string and adds the statements to the given MemModel.
         *
         * @param string $jsonString The string that contains the rdf model, encoded as a json-string.
         * @param MemModel $model A reference to the model, where to add the statements, usually an empty MemModel.
         */
        public function generateModelFromString($jsonString, $model) {
                
                $jsonModel = array();
                $jsonModel = json_decode($jsonString, true);
                
                // throws an excpetion if json model was corrupt
                if (!is_array($jsonModel)) {
                        throw new Exception('error in json string');
                }
                
                foreach ($jsonModel as $subject=>$remain) {
                        foreach ($remain as $predicate=>$object) {
                                $s = (strpos($subject, '_') === 0) ? new BlankNode(substr($subject, 2)) : new Resource($subject);
                                $p = new Resource($predicate);
                                
                                foreach ($object as $obj) {
                                        if ($obj['type'] === 'uri') {
                                                $o = new Resource($obj['value']);
                                        } else if ($obj['type'] === 'bnode') {
                                                $o = new BlankNode(substr($obj['value'], 2));
                                        } else {
                                                $dtype = (isset($obj['datatype'])) ? $obj['datatype'] : '';
                                                $lang = (isset($obj['lang'])) ? $obj['lang'] : '';

                                                $oVal = $obj['value'];

                                                $o = new Literal($oVal, $lang);
                                                $o->setDatatype($dtype);
                                        }
                                        
                                        $model->add(new Statement($s, $p, $o));
                                }
                        }
                }
        }
}
?>