@Override
public synchronized void removeStatements(
Resource subj, URI pred, Value obj, Resource... contexts) throws SailException {
if (sail.isArchiving()) {
CloseableIteration<? extends Statement, SailException> stmts;
stmts = super.getStatements(subj, pred, obj, false, contexts);
try {
while (stmts.hasNext()) {
Statement st = stmts.next();
Resource s = st.getSubject();
URI p = st.getPredicate();
Value o = st.getObject();
Resource ctx = st.getContext();
removeRevision(s, p);
if (ctx instanceof URI && !ctx.equals(trx)) {
if (modified.add(ctx)) {
super.addStatement(getTrx(), MODIFIED, ctx, getTrx());
}
BNode node = vf.createBNode();
super.addStatement(ctx, CONTAINED, node, getTrx());
super.addStatement(node, RDF.SUBJECT, s, getTrx());
super.addStatement(node, RDF.PREDICATE, p, getTrx());
super.addStatement(node, RDF.OBJECT, o, getTrx());
}
}
} finally {
stmts.close();
}
super.removeStatements(subj, pred, obj, contexts);
} else {
if (sail.getMaxArchive() > 0 && arch.size() <= sail.getMaxArchive()) {
CloseableIteration<? extends Statement, SailException> stmts;
stmts = super.getStatements(subj, pred, obj, false, contexts);
try {
int maxArchive = sail.getMaxArchive();
while (stmts.hasNext() && arch.size() <= maxArchive) {
Statement st = stmts.next();
Resource ctx = st.getContext();
if (ctx instanceof URI && !ctx.equals(trx)) {
arch.add(st);
}
}
} finally {
stmts.close();
}
}
super.removeStatements(subj, pred, obj, contexts);
removeRevision(subj, pred);
if (contexts != null && contexts.length > 0) {
for (Resource ctx : contexts) {
if (ctx != null && modified.add(ctx)) {
addMetadata(currentTrx, MODIFIED, ctx, currentTrx);
}
}
}
}
}
@Test
public void testAddWhileQuerying() throws Exception {
// Add some data to the repository
con.begin();
con.addStatement(painter, RDF.TYPE, RDFS.CLASS);
con.addStatement(painting, RDF.TYPE, RDFS.CLASS);
con.addStatement(picasso, RDF.TYPE, painter);
con.addStatement(guernica, RDF.TYPE, painting);
con.addStatement(picasso, paints, guernica);
con.commit();
ParsedTupleQuery tupleQuery =
QueryParserUtil.parseTupleQuery(QueryLanguage.SERQL, "SELECT C FROM {} rdf:type {C}", null);
CloseableIteration<? extends BindingSet, QueryEvaluationException> iter;
iter = con.evaluate(tupleQuery.getTupleExpr(), null, EmptyBindingSet.getInstance(), false);
con.begin();
while (iter.hasNext()) {
BindingSet bindings = iter.next();
Value c = bindings.getValue("C");
if (c instanceof Resource) {
con.addStatement((Resource) c, RDF.TYPE, RDFS.CLASS);
}
}
con.commit();
assertEquals(3, countElements(con.getStatements(null, RDF.TYPE, RDFS.CLASS, false)));
// simulate auto-commit
tupleQuery =
QueryParserUtil.parseTupleQuery(QueryLanguage.SERQL, "SELECT P FROM {} P {}", null);
iter = con.evaluate(tupleQuery.getTupleExpr(), null, EmptyBindingSet.getInstance(), false);
while (iter.hasNext()) {
BindingSet bindings = iter.next();
Value p = bindings.getValue("P");
if (p instanceof URI) {
con.begin();
con.addStatement((URI) p, RDF.TYPE, RDF.PROPERTY);
con.commit();
}
}
assertEquals(2, countElements(con.getStatements(null, RDF.TYPE, RDF.PROPERTY, false)));
}
protected int verifyQueryResult(
CloseableIteration<? extends BindingSet, QueryEvaluationException> resultIter,
int expectedBindingCount)
throws QueryEvaluationException {
int resultCount = 0;
while (resultIter.hasNext()) {
BindingSet resultBindings = resultIter.next();
resultCount++;
assertEquals(
"Wrong number of binding names for binding set",
expectedBindingCount,
resultBindings.getBindingNames().size());
int bindingCount = 0;
Iterator<Binding> bindingIter = resultBindings.iterator();
while (bindingIter.hasNext()) {
bindingIter.next();
bindingCount++;
}
assertEquals("Wrong number of bindings in binding set", expectedBindingCount, bindingCount);
}
return resultCount;
}
public Statement next() throws QueryEvaluationException {
try {
return baseIteration.next();
} catch (SailException e) {
throw new QueryEvaluationException(e);
}
}
private boolean isObsolete(Resource ctx) throws SailException {
CloseableIteration<? extends Statement, SailException> stmts;
stmts = super.getStatements(null, null, null, true, ctx);
try {
while (stmts.hasNext()) {
Statement st = stmts.next();
URI pred = st.getPredicate();
Value obj = st.getObject();
String ns = pred.getNamespace();
if (Audit.NAMESPACE.equals(ns) || PROV.equals(ns) || AUDIT_2012.equals(ns)) continue;
if (RDF.SUBJECT.equals(pred) || RDF.PREDICATE.equals(pred) || RDF.OBJECT.equals(pred))
continue;
if (RDF.TYPE.equals(pred) && obj instanceof URI) {
ns = ((URI) obj).getNamespace();
if (Audit.NAMESPACE.equals(ns)
|| PROV.equals(ns)
|| AUDIT_2012.equals(ns)
|| RDF.NAMESPACE.equals(ns)) continue;
}
return false;
}
} finally {
stmts.close();
}
return true;
}
private void removeInforming(
URI activity, URI entity, Resource subj, URI pred, Value obj, Resource... contexts)
throws SailException {
if (contexts != null && contexts.length == 0) {
CloseableIteration<? extends Statement, SailException> stmts;
stmts = super.getStatements(subj, pred, obj, false, contexts);
try {
while (stmts.hasNext()) {
Statement st = stmts.next();
Resource ctx = st.getContext();
subj = st.getSubject();
pred = st.getPredicate();
obj = st.getObject();
removeInformingGraph(activity, entity, subj, pred, obj, ctx);
}
} finally {
stmts.close();
}
} else if (contexts == null) {
removeInformingGraph(activity, entity, subj, pred, obj, null);
} else {
for (Resource ctx : contexts) {
removeInformingGraph(activity, entity, subj, pred, obj, ctx);
}
}
}
@Override
public CloseableIteration<RyaStatement, RyaDAOException> join(C conf, RyaURI... preds)
throws RyaDAOException {
ConcurrentHashMap<Map.Entry<RyaURI, RyaType>, Integer> ht =
new ConcurrentHashMap<Map.Entry<RyaURI, RyaType>, Integer>();
int count = 0;
boolean first = true;
for (RyaURI pred : preds) {
count++;
// query
CloseableIteration<RyaStatement, RyaDAOException> results =
ryaQueryEngine.query(new RyaStatement(null, pred, null), null);
// add to hashtable
while (results.hasNext()) {
RyaStatement next = results.next();
RyaURI subject = next.getSubject();
RyaType object = next.getObject();
Map.Entry<RyaURI, RyaType> entry =
new RdfCloudTripleStoreUtils.CustomEntry<RyaURI, RyaType>(subject, object);
if (!first) {
if (!ht.containsKey(entry)) {
continue; // not in join
}
}
ht.put(entry, count);
}
// remove from hashtable values that are under count
if (first) {
first = false;
} else {
for (Map.Entry<Map.Entry<RyaURI, RyaType>, Integer> entry : ht.entrySet()) {
if (entry.getValue() < count) {
ht.remove(entry.getKey());
}
}
}
}
final Enumeration<Map.Entry<RyaURI, RyaType>> keys = ht.keys();
return new CloseableIteration<RyaStatement, RyaDAOException>() {
@Override
public void close() throws RyaDAOException {}
@Override
public boolean hasNext() throws RyaDAOException {
return keys.hasMoreElements();
}
@Override
public RyaStatement next() throws RyaDAOException {
Map.Entry<RyaURI, RyaType> subjObj = keys.nextElement();
return new RyaStatement(subjObj.getKey(), null, subjObj.getValue());
}
@Override
public void remove() throws RyaDAOException {
keys.nextElement();
}
};
}
@Override
protected BindingSet getNextElement() throws QueryEvaluationException {
if (hashTable == null) {
setupHashTable();
}
while (currentScanElem == null) {
if (scanList.size() > 0) {
currentScanElem = scanList.remove(0);
} else {
if (restIter.hasNext()) {
currentScanElem = restIter.next();
} else {
// no more elements available
return null;
}
}
if (currentScanElem instanceof EmptyBindingSet) {
// the empty bindingset should be merged with all bindingset in
// the hash table
hashTableValues = new ArrayList<BindingSet>();
for (BindingSet key : hashTable.keySet()) {
hashTableValues.addAll(hashTable.get(key));
}
} else {
BindingSet key = calcKey(currentScanElem, joinAttributes);
if (hashTable.containsKey(key)) {
hashTableValues = new ArrayList<BindingSet>(hashTable.get(key));
} else {
currentScanElem = null;
hashTableValues = null;
}
}
}
BindingSet nextHashTableValue = hashTableValues.remove(0);
QueryBindingSet result = new QueryBindingSet(currentScanElem);
for (String name : nextHashTableValue.getBindingNames()) {
Binding b = nextHashTableValue.getBinding(name);
if (!result.hasBinding(name)) {
result.addBinding(b);
}
}
if (hashTableValues.size() == 0) {
// we've exhausted the current scanlist entry
currentScanElem = null;
hashTableValues = null;
}
return result;
}
public Statement next() {
try {
last = stmts.next();
if (last == null) {
stmts.close();
}
return last;
} catch (RepositoryException e) {
throw new ModelException(e);
}
}
protected void testValueRoundTrip(Resource subj, URI pred, Value obj) throws Exception {
con.begin();
con.addStatement(subj, pred, obj);
con.commit();
CloseableIteration<? extends Statement, SailException> stIter =
con.getStatements(null, null, null, false);
try {
assertTrue(stIter.hasNext());
Statement st = stIter.next();
assertEquals(subj, st.getSubject());
assertEquals(pred, st.getPredicate());
assertEquals(obj, st.getObject());
assertTrue(!stIter.hasNext());
} finally {
stIter.close();
}
ParsedTupleQuery tupleQuery =
QueryParserUtil.parseTupleQuery(
QueryLanguage.SERQL,
"SELECT S, P, O FROM {S} P {O} WHERE P = <" + pred.stringValue() + ">",
null);
CloseableIteration<? extends BindingSet, QueryEvaluationException> iter;
iter = con.evaluate(tupleQuery.getTupleExpr(), null, EmptyBindingSet.getInstance(), false);
try {
assertTrue(iter.hasNext());
BindingSet bindings = iter.next();
assertEquals(subj, bindings.getValue("S"));
assertEquals(pred, bindings.getValue("P"));
assertEquals(obj, bindings.getValue("O"));
assertTrue(!iter.hasNext());
} finally {
iter.close();
}
}
private void setupHashTable() throws QueryEvaluationException {
hashTable = new HashMap<BindingSet, ArrayList<BindingSet>>();
List<BindingSet> leftArgResults = new ArrayList<BindingSet>();
List<BindingSet> rightArgResults = new ArrayList<BindingSet>();
while (leftIter.hasNext() && rightIter.hasNext()) {
BindingSet b = leftIter.next();
leftArgResults.add(b);
b = rightIter.next();
rightArgResults.add(b);
}
List<BindingSet> smallestResult = null;
if (leftIter.hasNext()) { // leftArg is the greater relation
smallestResult = rightArgResults;
scanList = leftArgResults;
restIter = leftIter;
} else { // rightArg is the greater relation (or they are equal)
smallestResult = leftArgResults;
scanList = rightArgResults;
restIter = rightIter;
}
// create the hash table for our join
for (BindingSet b : smallestResult) {
BindingSet hashKey = calcKey(b, joinAttributes);
ArrayList<BindingSet> hashValue = null;
if (hashTable.containsKey(hashKey)) {
hashValue = hashTable.get(hashKey);
} else {
hashValue = new ArrayList<BindingSet>();
}
hashValue.add(b);
hashTable.put(hashKey, hashValue);
}
}
protected static Value _getObject(Resource subject, URI predicate, SailConnection c)
throws SailException {
CloseableIteration<? extends Statement, SailException> i =
c.getStatements(subject, predicate, null, true);
try {
if (i.hasNext()) {
return i.next().getObject();
} else {
return null;
}
} finally {
i.close();
}
}
@Override
public T getNextElement() {
while (rightIter != null || result.hasNext()) {
if (rightIter == null) {
rightIter = result.next();
}
if (rightIter.hasNext()) {
return rightIter.next();
} else {
rightIter.close();
rightIter = null;
}
}
return null;
}
@Test
public void testGetNamespaces() throws Exception {
con.begin();
con.setNamespace("rdf", RDF.NAMESPACE);
con.commit();
CloseableIteration<? extends Namespace, SailException> namespaces = con.getNamespaces();
try {
assertTrue(namespaces.hasNext());
Namespace rdf = namespaces.next();
assertEquals("rdf", rdf.getPrefix());
assertEquals(RDF.NAMESPACE, rdf.getName());
assertTrue(!namespaces.hasNext());
} finally {
namespaces.close();
}
}
private void removeAllRevisions(Resource subj) throws SailException {
CloseableIteration<? extends Statement, SailException> stmts;
Resource s = getContainerURI(subj);
stmts = super.getStatements(s, REVISION, null, true);
try {
while (stmts.hasNext()) {
Statement st = stmts.next();
Value ctx = st.getObject();
if (ctx instanceof URI && modified.add((URI) ctx)) {
addMetadata(getTrx(), MODIFIED, ctx, getTrx());
}
super.removeStatements(s, REVISION, ctx);
}
} finally {
stmts.close();
}
}
private void cacheStatements(final Resource subj, final URI pred, final Value obj)
throws SailException {
boolean includeInferred = false;
CloseableIteration<? extends Statement, SailException> iter =
baseSailConnection.getStatements(subj, pred, obj, includeInferred);
while (iter.hasNext()) {
Statement st = iter.next();
cacheConnection.addStatement(
st.getSubject(), st.getPredicate(), st.getObject(), st.getContext());
}
iter.close();
cacheConnection.commit();
}
protected boolean containsGraph(String graph) {
connect();
try {
for (CloseableIteration<? extends Resource, SailException> res = connection.getContextIDs();
res.hasNext(); ) {
Resource r = res.next();
if (r.stringValue().equals(graph.toString())) return true;
}
} catch (SailException e) {
e.printStackTrace();
}
disconnect();
return false;
}
/**
* LDP-Style to serialize a resource.
*
* @param writer the writer to serialize to
* @param subject the resource to serialize
* @param iteration the Iteration containing the data
* @throws RDFHandlerException
* @throws RepositoryException
*/
public static void exportIteration(
RDFWriter writer, URI subject, CloseableIteration<Statement, RepositoryException> iteration)
throws RDFHandlerException, RepositoryException {
writer.startRDF();
writer.handleNamespace(LDP.PREFIX, LDP.NAMESPACE);
writer.handleNamespace(RDF.PREFIX, RDF.NAMESPACE);
writer.handleNamespace(XSD.PREFIX, XSD.NAMESPACE);
writer.handleNamespace(DCTERMS.PREFIX, DCTERMS.NAMESPACE);
writer.handleNamespace("parent", subject.getNamespace());
writer.handleNamespace("child", subject.stringValue().replaceFirst("/*$", "/"));
writer.handleNamespace("this", subject.stringValue().replaceFirst("/*$", "#"));
while (iteration.hasNext()) {
writer.handleStatement(iteration.next());
}
writer.endRDF();
}
@Override
public CloseableIteration<RyaURI, RyaDAOException> join(
C conf, Map.Entry<RyaURI, RyaType>... predObjs) throws RyaDAOException {
ConcurrentHashMap<RyaURI, Integer> ht = new ConcurrentHashMap<RyaURI, Integer>();
int count = 0;
boolean first = true;
for (Map.Entry<RyaURI, RyaType> predObj : predObjs) {
count++;
RyaURI pred = predObj.getKey();
RyaType obj = predObj.getValue();
// query
CloseableIteration<RyaStatement, RyaDAOException> results =
ryaQueryEngine.query(new RyaStatement(null, pred, obj), null);
// add to hashtable
while (results.hasNext()) {
RyaURI subject = results.next().getSubject();
if (!first) {
if (!ht.containsKey(subject)) {
continue; // not in join
}
}
ht.put(subject, count);
}
// remove from hashtable values that are under count
if (first) {
first = false;
} else {
for (Map.Entry<RyaURI, Integer> entry : ht.entrySet()) {
if (entry.getValue() < count) {
ht.remove(entry.getKey());
}
}
}
}
return new EnumerationWrapper<RyaURI, RyaDAOException>(ht.keys());
}
private void evaluateIntoStatements(ParsedGraphQuery query, Collection<Statement> statements)
throws SailException, RDFHandlerException, QueryEvaluationException {
CloseableIteration<? extends BindingSet, QueryEvaluationException> bindingsIter =
getWrappedConnection()
.evaluate(query.getTupleExpr(), null, EmptyBindingSet.getInstance(), true);
try {
ValueFactory vf = getValueFactory();
while (bindingsIter.hasNext()) {
BindingSet bindings = bindingsIter.next();
Value subj = bindings.getValue("subject");
Value pred = bindings.getValue("predicate");
Value obj = bindings.getValue("object");
if (subj instanceof Resource && pred instanceof IRI && obj != null) {
statements.add(vf.createStatement((Resource) subj, (IRI) pred, obj));
}
}
} finally {
bindingsIter.close();
}
}