@Override
public int compare(Statement first, Statement second) {
// Cannot use Statement.equals as it does not take Context into account,
// but can check for reference equality (==)
if (first == second) {
return EQUAL;
}
if (first.getSubject().equals(second.getSubject())) {
if (first.getPredicate().equals(second.getPredicate())) {
if (first.getObject().equals(second.getObject())) {
// Context is the only part of a statement that should legitimately be null
if (first.getContext() == null) {
if (second.getContext() == null) {
return EQUAL;
} else {
return BEFORE;
}
} else if (second.getContext() == null) {
return AFTER;
} else {
return ValueComparator.getInstance().compare(first.getContext(), second.getContext());
}
} else {
return ValueComparator.getInstance().compare(first.getObject(), second.getObject());
}
} else {
return ValueComparator.getInstance().compare(first.getPredicate(), second.getPredicate());
}
} else {
return ValueComparator.getInstance().compare(first.getSubject(), second.getSubject());
}
}
@Override
public void handleStatement(Statement st) throws RDFHandlerException {
if (!writingStarted) {
throw new RuntimeException("Document writing has not yet been started");
}
try {
// SUBJECT
NTriplesUtil.append(st.getSubject(), writer);
writer.write(" ");
// PREDICATE
NTriplesUtil.append(st.getPredicate(), writer);
writer.write(" ");
// OBJECT
NTriplesUtil.append(st.getObject(), writer);
if (null != st.getContext()) {
writer.write(" ");
NTriplesUtil.append(st.getContext(), writer);
}
writer.write(" .\n");
} catch (IOException e) {
throw new RDFHandlerException(e);
}
}
@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);
}
}
}
}
}
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);
}
}
}
private Object encodeStatement(final Statement statement) {
return SerializerAvro.newGenericRecord(
Schemas.STATEMENT,
encodeIdentifier(statement.getSubject()),
encodeIdentifier(statement.getPredicate()), //
encodeValue(statement.getObject()), //
encodeIdentifier(statement.getContext()));
}
private URI getTrx() throws SailException {
if (trx == null) {
trx = sail.nextTransaction();
synchronized (metadata) {
for (Statement st : metadata) {
storeStatement(st.getSubject(), st.getPredicate(), st.getObject(), st.getContext());
}
metadata.clear();
}
}
return trx;
}
/**
* @return string containing human readable statements.
* @throws RepositoryException
*/
protected String dumpHumanReadableTriples() throws RepositoryException {
StringBuilder sb = new StringBuilder();
RepositoryResult<Statement> result = conn.getStatements(null, null, null, false);
while (result.hasNext()) {
Statement statement = result.next();
sb.append(
String.format(
"%s %s %s %s\n",
statement.getSubject(),
statement.getPredicate(),
statement.getObject(),
statement.getContext()));
}
return sb.toString();
}
@Override
public void handleStatement(Statement arg0) throws RDFHandlerException {
try {
_writer.write("<p>");
NTriplesUtil.append(arg0.getSubject(), _writer);
_writer.write(" ");
NTriplesUtil.append(arg0.getPredicate(), _writer);
_writer.write(" ");
NTriplesUtil.append(arg0.getObject(), _writer);
if (arg0.getContext() != null) {
_writer.write(" ");
NTriplesUtil.append(arg0.getContext(), _writer);
}
_writer.write(" .");
_writer.write("<p/>");
} catch (IOException e) {
throw new RDFHandlerException(e);
}
}
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();
}
private void flushArchive() throws SailException {
if (arch.size() <= sail.getMaxArchive()) {
for (Statement st : arch) {
Resource s = st.getSubject();
URI p = st.getPredicate();
Value o = st.getObject();
Resource ctx = st.getContext();
removeRevision(s, p);
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());
if (ctx instanceof URI && modified.add(ctx)) {
super.addStatement(getTrx(), MODIFIED, ctx, getTrx());
}
}
arch.clear();
}
}
@Override
public synchronized void commit() throws SailException {
flushArchive();
if (trx != null) {
for (Statement st : arch) {
Resource ctx = st.getContext();
if (ctx instanceof URI) {
modified.add(ctx);
}
}
for (Resource ctx : modified) {
if (isObsolete(ctx)) {
super.addStatement(ctx, RDF.TYPE, Audit.OBSOLETE, trx);
}
}
GregorianCalendar cal = new GregorianCalendar();
XMLGregorianCalendar xgc = factory.newXMLGregorianCalendar(cal);
Literal now = vf.createLiteral(xgc);
super.addStatement(trx, RDF.TYPE, TRANSACTION, trx);
super.addStatement(trx, COMMITTED_ON, now, trx);
for (Resource predecessor : predecessors) {
super.addStatement(trx, PREDECESSOR, predecessor, trx);
}
sail.recent(trx, getWrappedConnection());
}
super.commit();
metadata.clear();
revised.clear();
modified.clear();
arch.clear();
if (trx != null) {
sail.committed(trx, predecessors);
predecessors = Collections.singleton(trx);
trx = null;
}
}
private static PredicateObjectMap extractPredicateObjectMap(
SesameDataSet r2rmlMappingGraph,
Resource triplesMapSubject,
Resource predicateObject,
Set<GraphMap> savedGraphMaps,
Map<Resource, TriplesMap> triplesMapResources)
throws InvalidR2RMLStructureException, R2RMLDataError, InvalidR2RMLSyntaxException {
log.debug("[RMLMappingFactory:extractPredicateObjectMap] Extract predicate-object map..");
// Extract predicate maps
URI p = r2rmlMappingGraph.URIref(Vocab.R2RML_NAMESPACE + R2RMLTerm.PREDICATE_MAP);
List<Statement> statements = r2rmlMappingGraph.tuplePattern(predicateObject, p, null);
if (statements.size() < 1) {
throw new InvalidR2RMLStructureException(
"[RMLMappingFactory:extractSubjectMap] "
+ predicateObject.stringValue()
+ " has no predicate map defined : one or more is required.");
}
Set<PredicateMap> predicateMaps = new HashSet<PredicateMap>();
try {
for (Statement statement : statements) {
log.info("[RMLMappingFactory] saved Graphs " + savedGraphMaps);
PredicateMap predicateMap =
extractPredicateMap(
r2rmlMappingGraph, (Resource) statement.getObject(), savedGraphMaps);
predicateMaps.add(predicateMap);
}
} catch (ClassCastException e) {
throw new InvalidR2RMLStructureException(
"[RMLMappingFactory:extractPredicateObjectMaps] "
+ "A resource was expected in object of predicateMap of "
+ predicateObject.stringValue());
}
// Extract object maps
URI o = r2rmlMappingGraph.URIref(Vocab.R2RML_NAMESPACE + R2RMLTerm.OBJECT_MAP);
statements = r2rmlMappingGraph.tuplePattern(predicateObject, o, null);
if (statements.size() < 1) {
throw new InvalidR2RMLStructureException(
"[RMLMappingFactory:extractPredicateObjectMap] "
+ predicateObject.stringValue()
+ " has no object map defined : one or more is required.");
}
Set<ObjectMap> objectMaps = new HashSet<ObjectMap>();
Set<ReferencingObjectMap> refObjectMaps = new HashSet<ReferencingObjectMap>();
try {
for (Statement statement : statements) {
log.debug("[RMLMappingFactory:extractPredicateObjectMap] Try to extract object map..");
ReferencingObjectMap refObjectMap =
extractReferencingObjectMap(
r2rmlMappingGraph,
(Resource) statement.getObject(),
savedGraphMaps,
triplesMapResources);
if (refObjectMap != null) {
refObjectMaps.add(refObjectMap);
// Not a simple object map, skip to next.
continue;
}
ObjectMap objectMap =
extractObjectMap(
r2rmlMappingGraph,
(Resource) statement.getObject(),
savedGraphMaps,
triplesMapResources);
objectMap.setOwnTriplesMap(triplesMapResources.get(triplesMapSubject));
log.debug(
"[RMLMappingFactory:extractPredicateObjectMap] ownTriplesMap attempted "
+ triplesMapResources.get(statement.getContext())
+ " for object "
+ statement.getObject().stringValue());
objectMaps.add(objectMap);
}
} catch (ClassCastException e) {
throw new InvalidR2RMLStructureException(
"[RMLMappingFactory:extractPredicateObjectMaps] "
+ "A resource was expected in object of objectMap of "
+ predicateObject.stringValue());
}
PredicateObjectMap predicateObjectMap =
new StdPredicateObjectMap(predicateMaps, objectMaps, refObjectMaps);
// Add graphMaps
Set<GraphMap> graphMaps = new HashSet<GraphMap>();
Set<Value> graphMapValues =
extractValuesFromResource(r2rmlMappingGraph, predicateObject, R2RMLTerm.GRAPH_MAP);
if (graphMapValues != null) {
graphMaps = extractGraphMapValues(r2rmlMappingGraph, graphMapValues, savedGraphMaps);
log.info("[RMLMappingFactory] graph Maps returned " + graphMaps);
}
/*Set<GraphMap> graphMaps = new HashSet<GraphMap>();
log.debug("[RMLMappingFactory] GraphMaps " + graphMaps);
if (graphMapValues != null) {
for (Value graphMap : graphMapValues) {
log.info("[RMLMappingFactory] graph map + " + graphMap);
// Create associated graphMap if it has not already created
boolean found = false;
GraphMap graphMapFound = null;
/*
* for (GraphMap savedGraphMap : savedGraphMaps) if
* (savedGraphMap.getGraph().equals(graphMap)) { found = true;
* graphMapFound = savedGraphMap; }
*/
/* if (found) {
log.info("[RMLMappingFactory] graph map + " + graphMap);
graphMaps.add(graphMapFound);
} else {
GraphMap newGraphMap = extractGraphMap(r2rmlMappingGraph,
(Resource) graphMap);
savedGraphMaps.add(newGraphMap);
graphMaps.add(newGraphMap);
log.info("[RMLMappingFactory] new graph map + " + newGraphMap);
}
}
}*/
predicateObjectMap.setGraphMaps(graphMaps);
log.debug("[RMLMappingFactory:extractPredicateObjectMap] Extract predicate-object map done.");
return predicateObjectMap;
}
