public function serializeGraphToString($graphUri, $pretty = false, $useAc = true)
{
$triples = array();
$store = Erfurt_App::getInstance()->getStore();
require_once 'Erfurt/Sparql/SimpleQuery.php';
$sparql = new Erfurt_Sparql_SimpleQuery();
$sparql->setProloguePart('SELECT ?s ?p ?o');
$sparql->addFrom($graphUri);
$sparql->setWherePart('WHERE { ?s ?p ?o }');
$sparql->setOrderClause('?s ?p ?o');
$sparql->setLimit(1000);
$offset = 0;
while (true) {
$sparql->setOffset($offset);
$result = $store->sparqlQuery($sparql, array('result_format' => 'extended', 'use_owl_imports' => false, 'use_additional_imports' => false, 'use_ac' => $useAc));
$counter = 0;
foreach ($result['results']['bindings'] as $stm) {
$s = $stm['s']['value'];
$p = $stm['p']['value'];
$o = $stm['o'];
if (!isset($triples["{$s}"])) {
$triples["{$s}"] = array();
}
if (!isset($triples["{$s}"]["{$p}"])) {
$triples["{$s}"]["{$p}"] = array();
}
if ($o['type'] === 'typed-literal') {
$triples["{$s}"]["{$p}"][] = array('type' => 'literal', 'value' => $o['value'], 'datatype' => $o['datatype']);
} else {
if ($o['type'] === 'typed-literal') {
$oArray = array('type' => 'literal', 'value' => $o['value']);
if (isset($o['xml:lang'])) {
$oArray['lang'] = $o['xml:lang'];
}
$triples["{$s}"]["{$p}"][] = $oArray;
} else {
$triples["{$s}"]["{$p}"][] = array('type' => $o['type'], 'value' => $o['value']);
}
}
$counter++;
}
if ($counter < 1000) {
break;
}
$offset += 1000;
}
return json_encode($triples);
}
protected function _serializeResource($resource, $useAc = true, $level = 0)
{
require_once 'Erfurt/Sparql/SimpleQuery.php';
$query = new Erfurt_Sparql_SimpleQuery();
$query->setProloguePart('SELECT ?s ?p ?o');
$query->addFrom($this->_graphUri);
$query->setWherePart('WHERE { ?s ?p ?o . FILTER (sameTerm(?s, <' . $resource . '>))}');
$query->setOrderClause('?s ?p ?o');
$query->setLimit(1000);
$offset = 0;
$bnObjects = array();
while (true) {
$query->setOffset($offset);
$result = $this->_store->sparqlQuery($query, array('result_format' => 'extended', 'use_owl_imports' => false, 'use_additional_imports' => false, 'use_ac' => $useAc));
foreach ($result['results']['bindings'] as $row) {
$s = $row['s']['value'];
$p = $row['p']['value'];
$o = $row['o']['value'];
$sType = $row['s']['type'];
$oType = $row['o']['type'];
$lang = isset($row['o']['xml:lang']) ? $row['o']['xml:lang'] : null;
$dType = isset($row['o']['datatype']) ? $row['o']['datatype'] : null;
if ($oType === 'bnode') {
$bnObjects[] = substr($o, 2);
}
$this->_handleStatement($s, $p, $o, $sType, $oType, $lang, $dType);
}
if (count($result['results']['bindings']) < 1000) {
break;
}
$offset += 1000;
}
$this->_forceWrite();
// SCBD -> Write Bnodes, too
if ($level <= 10) {
foreach ($bnObjects as $bn) {
$this->_serializeResource($bn, $useAc, $level + 1);
}
}
// We only return SCBD of the TOP resource...
if ($level > 0) {
return;
}
// SCBD: Do the same for all Resources, that have the resource as object
$query = new Erfurt_Sparql_SimpleQuery();
$query->setProloguePart('SELECT ?s ?p ?o');
$query->addFrom($this->_graphUri);
$query->setWherePart('WHERE { ?s ?p ?o . ?s ?p2 ?o2 . FILTER (sameTerm(?o2, <' . $resource . '>)) }');
$query->setOrderClause('?s ?p ?o');
$query->setLimit(1000);
$offset = 0;
$bnObjects = array();
while (true) {
$query->setOffset($offset);
$result = $this->_store->sparqlQuery($query, array('result_format' => 'extended', 'use_owl_imports' => false, 'use_additional_imports' => false, 'use_ac' => $useAc));
foreach ($result['results']['bindings'] as $row) {
$s = $row['s']['value'];
$p = $row['p']['value'];
$o = $row['o']['value'];
$sType = $row['s']['type'];
$oType = $row['o']['type'];
$lang = isset($row['o']['xml:lang']) ? $row['o']['xml:lang'] : null;
$dType = isset($row['o']['datatype']) ? $row['o']['datatype'] : null;
if ($oType === 'bnode') {
$bnObjects[] = substr($o, 2);
}
$this->_handleStatement($s, $p, $o, $sType, $oType, $lang, $dType);
}
if (count($result['results']['bindings']) < 1000) {
break;
}
$offset += 1000;
}
$this->_forceWrite();
// SCBD -> Write Bnodes, too
if ($level <= 10) {
foreach ($bnObjects as $bn) {
$this->_serializeResource($bn, $useAc, $level + 1);
}
}
}
