| 1 | <?php
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| 2 | // ----------------------------------------------------------------------------------
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| 3 | // Class: TriXParser
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| 4 | // ----------------------------------------------------------------------------------
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| 5 |
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| 6 | /**
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| 7 | * Temporary implementation of a TriX-Parser (Usable only with PHP > V5)
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| 8 | * Currently, it doesn't support any namespaces and has problems with typed literals.
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| 9 | * So this parser only works with TRIX documents where the default namespace is the TRIX namespace.
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| 10 | *
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| 11 | * @version $Id$
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| 12 | * @author Daniel Westphal (http://www.d-westphal.de)
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| 13 | *
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| 14 | * @package dataset
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| 15 | * @access public
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| 16 | **/
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| 17 | class TriXParser
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| 18 | {
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| 19 | /**
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| 20 | * Reference to the graphSet
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| 21 | *
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| 22 | * @var GraphSet
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| 23 | * @access private
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| 24 | */
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| 25 | var $graphSet;
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| 26 |
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| 27 | /**
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| 28 | * Constructor
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| 29 | * Needs a reference to a graphSet
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| 30 | *
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| 31 | * @param GraphSet
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| 32 | * @access public
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| 33 | */
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| 34 | function TriXParser(&$graphSet)
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| 35 | {
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| 36 | $this->graphSet=&$graphSet;
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| 37 | }
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| 38 |
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| 39 | /**
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| 40 | * Parse an XML string
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| 41 | *
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| 42 | * @param string
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| 43 | * @access public
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| 44 | */
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| 45 | function parseString($string)
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| 46 | {
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| 47 | $this->_populateGraphSet(simplexml_load_string($string));
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| 48 | }
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| 49 |
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| 50 | /**
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| 51 | * Parse from a file
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| 52 | *
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| 53 | * @param string
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| 54 | * @access public
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| 55 | */
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| 56 | function parseFile($pathToFile)
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| 57 | {
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| 58 | $this->_populateGraphSet(simplexml_load_file($pathToFile));
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| 59 | }
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| 60 |
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| 61 | /**
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| 62 | * Populates the graphSet with namedGraphs and triples.
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| 63 | *
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| 64 | * @param object simpleXMLModel $xmlModel
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| 65 | * @access private
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| 66 | */
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| 67 | function _populateGraphSet(&$xmlModel)
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| 68 | {
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| 69 | $defaultGraphOccurred=false;
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| 70 |
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| 71 | foreach ($xmlModel->graph as $graph)
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| 72 | {
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| 73 | if (isset($graph->uri))
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| 74 | {
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| 75 | $graphName=(string)$graph->uri;
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| 76 | $namedGraph=& $this->graphSet->getNamedGraph($graphName);
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| 77 | if ($namedGraph ==null)
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| 78 | $namedGraph=& $this->graphSet->createGraph($graphName);
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| 79 | } else
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| 80 | {
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| 81 | if ($defaultGraphOccurred)
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| 82 | trigger_error('Only one unnamed Graph per file allowed', E_USER_ERROR);
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| 83 |
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| 84 | $namedGraph=& $this->graphSet->getDefaultGraph();
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| 85 | $defaultGraphOccurred=true;
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| 86 | }
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| 87 |
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| 88 | foreach ($graph->triple as $triple)
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| 89 | {
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| 90 | $tripleCount=0;
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| 91 | $tripleArray=array();
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| 92 | foreach ($triple->children() as $tag => $value)
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| 93 | {
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| 94 | $tripleArray[$tripleCount++]=$this->_element2Resource((string)$tag,$value);
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| 95 | };
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| 96 | $namedGraph->add(new Statement($tripleArray[0],$tripleArray[1],$tripleArray[2]));
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| 97 | };
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| 98 | };
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| 99 | }
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| 100 |
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| 101 | /**
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| 102 | * return a mathing resource tyoe
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| 103 | *
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| 104 | * @param string
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| 105 | * @param object simpleXMLNode $value
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| 106 | * @access private
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| 107 | */
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| 108 | function _element2Resource($tag,$value)
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| 109 | {
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| 110 | switch ($tag)
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| 111 | {
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| 112 | case 'uri':
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| 113 | return new Resource((string)$value);
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| 114 | break;
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| 115 |
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| 116 | case 'id':
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| 117 | return new BlankNode((string)$value);
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| 118 | break;
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| 119 |
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| 120 | case 'typedLiteral':
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| 121 | $literal=new Literal((string)$value);
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| 122 | $literal->setDatatype((string)$value['datatype']);
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| 123 | return $literal;
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| 124 | break;
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| 125 |
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| 126 | case 'plainLiteral':
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| 127 | $literal=new Literal((string)$value);
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| 128 | if(isset($value['xml:lang']))
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| 129 | $literal->setLanguage((string)$value['xml:lang']);
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| 130 | return $literal;
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| 131 | break;
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| 132 | }
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| 133 | }
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| 134 | }
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| 135 | ?> |
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