| 1 | <?php
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| 2 | require_once RDFAPI_INCLUDE_DIR . 'sparql/SparqlEngineDb/ResultRenderer.php';
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| 3 |
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| 4 | /**
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| 5 | * XML result renderer for SparqlEngine
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| 6 | *
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| 7 | * @author Tobias Gauà <tobias.gauss@web.de>
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| 8 | * @author Christian Weiske <cweiske@cweiske.de>
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| 9 | * @license http://www.gnu.org/licenses/lgpl.html LGPL
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| 10 | *
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| 11 | * @package sparql
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| 12 | */
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| 13 | class SparqlEngine_ResultRenderer_XML implements SparqlEngine_ResultRenderer
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| 14 | {
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| 15 | /**
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| 16 | * Converts the database results into the output format
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| 17 | * and returns the result.
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| 18 | *
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| 19 | * @param array $arVartable Variable table
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| 20 | * @param Query $query SPARQL query object
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| 21 | * @param SparqlEngine $engine Sparql Engine to query the database
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| 22 | * @return string XML result
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| 23 | */
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| 24 | public function convertFromResult($arVartable, Query $query, SparqlEngine $engine)
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| 25 | {
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| 26 | $this->query = $query;
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| 27 | $this->engine = $engine;
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| 28 | $this->dataset = $engine->getDataset();
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| 29 |
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| 30 | if ($arVartable instanceof NamedGraphMem) {
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| 31 | return $arVartable->writeRdfToString();
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| 32 | }
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| 33 |
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| 34 | $result = '<sparql xmlns="http://www.w3.org/2005/sparql-results#">';
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| 35 | $header = '<head>';
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| 36 |
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| 37 | // build header
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| 38 | if (is_array($arVartable)) {
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| 39 | $vars = $this->query->getResultVars();
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| 40 | $header = '<head>';
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| 41 | foreach ($vars as $value) {
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| 42 | $header = $header
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| 43 | . '<variable name="' . substr($value, 1) . '"/>';
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| 44 | }
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| 45 | $header = $header . '</head>';
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| 46 |
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| 47 | // build results
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| 48 | $solm = $this->query->getSolutionModifier();
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| 49 | $sel = $this->query->getResultForm();
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| 50 |
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| 51 | $distinct = 'false';
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| 52 | if ($sel == 'select distinct') {
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| 53 | $distinct = 'true';
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| 54 | }
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| 55 |
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| 56 | $ordered = 'false';
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| 57 | if ($solm['order by'] != 0) {
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| 58 | $ordered = 'true';
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| 59 | }
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| 60 |
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| 61 | $results = '<results ordered="'.$ordered.'" distinct="'.$distinct.'">';
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| 62 | foreach ($arVartable as $value) {
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| 63 | $results = $results.'<result>';
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| 64 | foreach ($value as $varname => $varvalue) {
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| 65 | $results = $results
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| 66 | . $this->_getBindingString(
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| 67 | substr($varname, 1),
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| 68 | $varvalue
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| 69 | );
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| 70 | }
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| 71 | $results = $results . '</result>';
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| 72 | }
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| 73 | $results = $results . '</results>';
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| 74 | } else {
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| 75 | $results = '</head><boolean>' . $vartable . '</boolean>';
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| 76 | }
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| 77 |
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| 78 | $result = $result . $header . $results . '</sparql>';
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| 79 | $result = simplexml_load_string($result);
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| 80 | return $result->asXML();
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| 81 | }//public function convertFromResult($arVartable, Query $query, SparqlEngine $engine)
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| 82 |
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| 83 |
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| 84 |
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| 85 | /**
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| 86 | * Helper Function for function buildXmlResult($vartable). Generates
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| 87 | * an xml string for a single variable an their corresponding value.
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| 88 | *
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| 89 | * @param String $varname The variables name
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| 90 | * @param Node $varvalue The value of the variable
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| 91 | * @return String The xml string
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| 92 | */
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| 93 | protected function _getBindingString($varname, $varvalue)
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| 94 | {
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| 95 | $binding = '<binding name="'.$varname.'">';
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| 96 | $value = '<unbound/>';
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| 97 |
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| 98 | if ($varvalue instanceof BlankNode) {
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| 99 | $value = '<bnode>' . $varvalue->getLabel() . '</bnode>';
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| 100 | } else if ($varvalue instanceof Resource) {
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| 101 | $value = '<uri>' . $varvalue->getUri() . '</uri>';
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| 102 | } else if ($varvalue instanceof Literal) {
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| 103 | $label = htmlspecialchars($varvalue->getLabel());
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| 104 | $value = '<literal>'.$label.'</literal>';
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| 105 | if ($varvalue->getDatatype() != null) {
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| 106 | $value = '<literal datatype="'
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| 107 | . $varvalue->getDatatype() . '">'
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| 108 | . $label
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| 109 | . '</literal>';
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| 110 | }
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| 111 | if ($varvalue->getLanguage() != null) {
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| 112 | $value = '<literal xml:lang="'
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| 113 | . $varvalue->getLanguage() . '">'
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| 114 | . $label
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| 115 | . '</literal>';
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| 116 | }
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| 117 | }
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| 118 | $binding = $binding . $value . '</binding>';
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| 119 |
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| 120 | return $binding;
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| 121 | }//protected function _getBindingString($varname, $varvalue)
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| 122 |
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| 123 | }//class SparqlEngine_ResultRenderer_XML implements SparqlEngine_ResultRenderer
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| 124 |
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| 125 | ?> |
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