protected function __init()
{
$csIndex = array();
$CSNS = 'http://purl.org/vocab/changeset/schema#';
// Get the triples to be added
if (empty($this->before)) {
$additions = $this->after;
} else {
$additions = ExtendedGraph::diff($this->after, $this->before);
}
//Get the triples to be removed
if (empty($this->after)) {
$removals = $this->before;
} else {
$removals = ExtendedGraph::diff($this->before, $this->after);
}
//remove etag triples
foreach (array('removals' => $removals, 'additions' => $additions) as $name => $graph) {
foreach ($graph as $uri => $properties) {
if (isset($properties["http://schemas.talis.com/2005/dir/schema#etag"])) {
unset(${$name}[$uri]["http://schemas.talis.com/2005/dir/schema#etag"]);
if (count(${$name}[$uri]) == 0) {
unset(${$name}[$uri]);
}
}
}
}
// Get an array of all the subject uris
$subjectIndex = !empty($this->a['subjectOfChange']) ? array($this->a['subjectOfChange']) : array_unique(array_merge(array_keys($additions), array_keys($removals)));
// Get the metadata for all the changesets
$date = !empty($this->a['createdDate']) ? $this->a['createdDate'] : date(DATE_ATOM);
$creator = !empty($this->a['creatorName']) ? $this->a['creatorName'] : 'Moriarty ChangeSet Builder';
$reason = !empty($this->a['changeReason']) ? $this->a['changeReason'] : 'Change using Moriarty ChangeSet Builder';
$csCount = 0;
foreach ($subjectIndex as $subjectOfChange) {
$csID = '_:cs' . $csCount;
$csIndex[$subjectOfChange] = $csID;
$this->addT($csID, 'http://www.w3.org/1999/02/22-rdf-syntax-ns#type', $CSNS . 'ChangeSet', 'uri');
$subjectType = strpos($subjectOfChange, '_:') === 0 ? 'bnode' : 'uri';
$this->addT($csID, $CSNS . 'subjectOfChange', $subjectOfChange, $subjectType);
$this->addT($csID, $CSNS . 'createdDate', $date, 'literal');
$this->addT($csID, $CSNS . 'creatorName', $creator, 'literal');
$this->addT($csID, $CSNS . 'changeReason', $reason, 'literal');
/* add extra user-given properties to each changeset*/
if (!empty($this->a['properties'])) {
foreach ($this->a['properties'] as $p => $objs) {
$this->addT($csID, $p, $objs);
}
}
$csCount++;
}
/*iterate through the triples to be added,
reifying them,
and linking to the Statements from the appropriate changeset
*/
$reifiedAdditions = ExtendedGraph::reify($additions, 'Add');
if (!empty($reifiedAdditions)) {
foreach ($reifiedAdditions as $nodeID => $props) {
$subject = $props['http://www.w3.org/1999/02/22-rdf-syntax-ns#subject'][0]['value'];
if (in_array($subject, $subjectIndex)) {
$csID = $csIndex[$subject];
$this->addT($csID, $CSNS . 'addition', $nodeID, 'bnode');
}
// if dc:source is given in the instantiating arguments, add it to the statement as provenance
if (isset($this->a['http://purl.org/dc/terms/source'])) {
$this->addT($nodeID, 'http://purl.org/dc/terms/source', $this->a['http://purl.org/dc/terms/source'], 'uri');
}
}
}
/*iterate through the triples to be removed,
reifying them,
and linking to the Statements from the appropriate changeset
*/
$reifiedRemovals = ExtendedGraph::reify($removals, 'Remove');
foreach ($reifiedRemovals as $nodeID => $props) {
$subject = $props['http://www.w3.org/1999/02/22-rdf-syntax-ns#subject'][0]['value'];
if (in_array($subject, $subjectIndex)) {
$csID = $csIndex[$subject];
$this->addT($csID, $CSNS . 'removal', $nodeID, 'bnode');
}
}
$this->_index = ExtendedGraph::merge($this->_index, $reifiedAdditions, $reifiedRemovals);
}
/**
* @param ExtendedGraph $otherGraph
* @return bool
*/
public function is_equal_to(ExtendedGraph $otherGraph)
{
$diffThisAndThat = ExtendedGraph::diff($this->get_index(), $otherGraph->get_index());
$diffThatAndThis = ExtendedGraph::diff($otherGraph->get_index(), $this->get_index());
return empty($diffThisAndThat) && empty($diffThatAndThis);
}
