| 1 | <?php
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| 2 |
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| 3 | // ----------------------------------------------------------------------------------
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| 4 | // Class: NTripleSerializer
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| 5 | // ----------------------------------------------------------------------------------
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| 6 |
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| 7 |
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| 8 | /**
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| 9 | * PHP N-Triple Serializer
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| 10 | *
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| 11 | * This class serialises models to N-Triple Syntax.
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| 12 | *
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| 13 | *
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| 14 | *
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| 15 | * @author Daniel Westphal <mail@d-westphal.de>
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| 16 | * @version $Id: NTripleSerializer.php 268 2006-05-15 05:28:09Z tgauss $
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| 17 | * @package syntax
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| 18 | * @access public
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| 19 | **/
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| 20 |
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| 21 |
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| 22 |
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| 23 | class NTripleSerializer extends Object {
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| 24 |
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| 25 | var $debug;
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| 26 | var $model;
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| 27 | var $res;
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| 28 |
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| 29 |
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| 30 |
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| 31 |
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| 32 |
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| 33 | /**
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| 34 | * Constructor
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| 35 | *
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| 36 | * @access public
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| 37 | */
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| 38 | function NTripleSerializer() {
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| 39 | $this->debug=FALSE;
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| 40 | }
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| 41 |
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| 42 | /**
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| 43 | * Serializes a model to N Triple syntax.
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| 44 | *
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| 45 | * @param object Model $model
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| 46 | * @return string
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| 47 | * @access public
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| 48 | */
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| 49 | function & serialize(&$m) {
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| 50 |
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| 51 | if (is_a($m, 'DbModel')) $m = $m->getMemModel();
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| 52 |
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| 53 | $this->reset();
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| 54 | if (!HIDE_ADVERTISE) {
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| 55 | $this->res .= '# Generated by NTripleSerializer.php from RDF RAP.' .
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| 56 | LINEFEED . '# http://www.wiwiss.fu-berlin.de/suhl/bizer/rdfapi/index.html'.
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| 57 | LINEFEED . LINEFEED;
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| 58 | }
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| 59 |
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| 60 | foreach ($m->triples as $t) {
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| 61 |
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| 62 | $s=$t->getSubject();
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| 63 | if (is_a($s, 'Blanknode')) {
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| 64 | $subject='_:'.$s->getURI();
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| 65 | } else {
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| 66 | $subject = '<' . preg_replace("' '", "''", $s->getURI()) . '>';
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| 67 | }
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| 68 |
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| 69 | $p=$t->getPredicate();
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| 70 | $predicate='<'.preg_replace("' '", "''", $p->getURI()).'>';
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| 71 |
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| 72 | $o=$t->getObject();
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| 73 | if (is_a($o, 'literal')) {
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| 74 | $object='"'.$o->getLabel().'"';
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| 75 | if ($o->getLanguage()!='') $object.='@'.$o->getLanguage();
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| 76 | if ($o->getDatatype()!='') $object.='^^<'.$o->getDatatype().">";
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| 77 | } elseif (is_a($o, 'Blanknode')) {
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| 78 | $object='_:'.$o->getURI();
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| 79 | } else {$object='<'.preg_replace("' '", "''", $o->getURI()).'>';};
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| 80 |
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| 81 | $this->res.=$subject.' '.$predicate.' '.$object.' .';
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| 82 | $this->res.=LINEFEED.LINEFEED;
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| 83 | }
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| 84 |
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| 85 | return $this->res;
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| 86 | }
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| 87 |
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| 88 |
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| 89 | /**
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| 90 | * Serializes a model and saves it into a file.
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| 91 | * Returns FALSE if the model couldn't be saved to the file.
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| 92 | *
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| 93 | * @access public
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| 94 | * @param object MemModel $model
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| 95 | * @param string $filename
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| 96 | * @return boolean
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| 97 | * @access public
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| 98 | */
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| 99 | function saveAs(&$model, $filename) {
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| 100 |
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| 101 | // serialize model
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| 102 | $n3 = $this->serialize($model);
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| 103 |
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| 104 | // write serialized model to file
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| 105 | $file_handle = @fopen($filename, 'w');
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| 106 | if ($file_handle) {
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| 107 | fwrite($file_handle, $n3);
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| 108 | fclose($file_handle);
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| 109 | return TRUE;
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| 110 | }else{
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| 111 | return FALSE;
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| 112 | };
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| 113 | }
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| 114 |
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| 115 |
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| 116 | /* ==================== Private Methods from here ==================== */
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| 117 |
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| 118 |
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| 119 | /**
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| 120 | * Readies this object for serializing another model
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| 121 | * @access private
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| 122 | * @param void
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| 123 | * @returns void
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| 124 | **/
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| 125 | function reset() {
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| 126 | $this->res="";
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| 127 | $this->model=NULL;
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| 128 | }
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| 129 |
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| 130 | }
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| 131 |
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| 132 |
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| 133 | ?> |
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