| 1 | <?php
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| 2 | // ----------------------------------------------------------------------------------
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| 3 | // Class: TriXSerializer
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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-Serializer
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| 8 | *
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| 9 | * @version $Id$
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| 10 | * @author Daniel Westphal (http://www.d-westphal.de)
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| 11 | *
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| 12 | * @package dataset
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| 13 | * @access public
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| 14 | **/
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| 15 | class TriXSerializer
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| 16 | {
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| 17 |
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| 18 | /**
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| 19 | * Reference to the graphSet
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| 20 | *
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| 21 | * @var object GraphSet
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| 22 | * @access private
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| 23 | */
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| 24 | var $graphSet;
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| 25 |
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| 26 |
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| 27 | /**
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| 28 | * Constructor
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| 29 | * Needs a reference to a graphSet
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| 30 | *
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| 31 | * @param GraphSet
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| 32 | * @access public
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| 33 | */
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| 34 | function TriXSerializer(&$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 | * Serialize the dataset to a TriX string
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| 41 | *
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| 42 | * @return string
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| 43 | * @access public
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| 44 | */
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| 45 | function & serializeToString()
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| 46 | {
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| 47 | return $this->_serialize();
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| 48 | }
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| 49 |
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| 50 | /**
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| 51 | * Serialize the dataset to a TriX string and save in file
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| 52 | *
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| 53 | * @param string
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| 54 | * @access public
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| 55 | */
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| 56 | function serializeToFile($fileName)
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| 57 | {
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| 58 | $serializedString=&$this->_serialize();
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| 59 | $handle = fopen($fileName, 'w');
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| 60 | fwrite($handle, $serializedString);
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| 61 | fclose($handle);
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| 62 | }
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| 63 |
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| 64 |
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| 65 | /**
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| 66 | * Serialize the dataset to a TriX string
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| 67 | *
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| 68 | * @return string
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| 69 | * @access private
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| 70 | */
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| 71 | function & _serialize()
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| 72 | {
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| 73 | //Trix header
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| 74 | $serializedString=
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| 75 | '<?xml version="1.0" encoding="utf-8"?>'.
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| 76 | '<TriX xmlns="http://www.w3.org/2004/03/trix/trix-1/">';
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| 77 |
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| 78 | //serialize defaultGraph if it is not empty
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| 79 | $defaultGraph=& $this->graphSet->getDefaultGraph();
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| 80 | if ($defaultGraph->isEmpty()===false)
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| 81 | {
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| 82 | $serializedString.='<graph>';
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| 83 | for($iterator = $this->graphSet->findInDefaultGraph(null,null,null); $iterator->valid(); $iterator->next())
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| 84 | {
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| 85 | $serializedString.='<triple>';
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| 86 |
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| 87 | $statement=$iterator->current();
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| 88 |
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| 89 | $serializedString.=$this->_node2string($statement->getSubject());
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| 90 | $serializedString.=$this->_node2string($statement->getPredicate());
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| 91 | $serializedString.=$this->_node2string($statement->getObject());
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| 92 |
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| 93 | $serializedString.='</triple>';
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| 94 | };
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| 95 | $serializedString.='</graph>';
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| 96 | }
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| 97 |
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| 98 | //serialize namedGraphs
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| 99 | foreach ($this->graphSet->listGraphNames() as $graphName)
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| 100 | {
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| 101 | $serializedString.='<graph>';
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| 102 | $serializedString.='<uri>'.$graphName.'</uri>';
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| 103 | for($iterator = $this->graphSet->findInNamedGraphs(new Resource($graphName),null,null,null); $iterator->valid(); $iterator->next())
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| 104 | {
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| 105 | $serializedString.='<triple>';
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| 106 |
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| 107 | $statement=$iterator->current();
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| 108 |
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| 109 | $serializedString.=$this->_node2string($statement->getSubject());
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| 110 | $serializedString.=$this->_node2string($statement->getPredicate());
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| 111 | $serializedString.=$this->_node2string($statement->getObject());
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| 112 |
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| 113 | $serializedString.='</triple>';
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| 114 | };
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| 115 | $serializedString.='</graph>';
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| 116 | };
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| 117 | //TriX footer
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| 118 | $serializedString.='</TriX>';
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| 119 | return $serializedString;
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| 120 | }
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| 121 |
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| 122 | /**
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| 123 | * Serialize node to a TriX string
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| 124 | *
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| 125 | * @param Node
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| 126 | * @return string
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| 127 | * @access private
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| 128 | */
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| 129 | function _node2string($node)
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| 130 | {
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| 131 | switch ($node)
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| 132 | {
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| 133 | case (is_a($node,'BlankNode')):
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| 134 | return ('<id>'.$node->getLabel().'</id>');
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| 135 |
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| 136 | case (is_a($node,'Resource')):
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| 137 | return ('<uri>'.$node->getLabel().'</uri>');
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| 138 |
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| 139 | case (is_a($node,'Literal')):
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| 140 |
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| 141 | if ($node->dtype!=null)
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| 142 | return ('<typedLiteral datatype="'.htmlentities($node->dtype).'">'.$node->getLabel().'</typedLiteral>');
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| 143 |
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| 144 | if ($node->lang!=null)
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| 145 | return ('<plainLiteral xml:lang="'.htmlentities($node->lang).'">'.$node->getLabel().'</plainLiteral>');
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| 146 |
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| 147 | return ('<plainLiteral>'.htmlentities($node->getLabel()).'</plainLiteral>');
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| 148 | }
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| 149 | }
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| 150 | }
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| 151 | ?> |
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