private void writeInlineEdge(
DataOutput out, InternalRelation edge, TitanType type, boolean writeEdgeType) {
assert type.isSimple();
assert writeEdgeType
|| type.isEdgeLabel()
|| (type.isPropertyKey() && !hasGenericDataType((TitanKey) type));
if (edge == null) {
assert !writeEdgeType;
if (type.isPropertyKey()) {
out.writeObject(null);
} else {
assert type.isEdgeLabel();
VariableLong.writePositive(out, 0);
}
} else {
if (writeEdgeType) {
IDHandler.writeInlineEdgeType(out, type.getID(), idManager);
}
if (edge.isProperty()) {
Object attribute = ((TitanProperty) edge).getAttribute();
if (hasGenericDataType((TitanKey) type)) out.writeClassAndObject(attribute);
else out.writeObject(attribute);
} else {
assert edge.isUnidirected() && edge.isEdge();
VariableLong.writePositive(out, edge.getVertex(1).getID());
}
}
}
private Entry getEntry(
InternalTitanTransaction tx,
InternalRelation edge,
InternalTitanVertex perspective,
Map<TitanType, TypeSignature> signatures,
boolean columnOnly) {
TitanType et = edge.getType();
long etid = et.getID();
int dirID;
if (edge.isProperty()) {
dirID = 0;
} else if (edge.getVertex(0).equals(perspective)) {
// Out TitanRelation
assert edge.isDirected() || edge.isUnidirected();
dirID = 2;
} else {
// In TitanRelation
assert !edge.isUnidirected() && edge.getVertex(1).equals(perspective);
dirID = 3;
}
int etIDLength = IDHandler.edgeTypeLength(etid, idManager);
ByteBuffer column = null, value = null;
if (et.isSimple()) {
if (et.isFunctional()) {
column = ByteBuffer.allocate(etIDLength);
IDHandler.writeEdgeType(column, etid, dirID, idManager);
} else {
column = ByteBuffer.allocate(etIDLength + VariableLong.positiveLength(edge.getID()));
IDHandler.writeEdgeType(column, etid, dirID, idManager);
VariableLong.writePositive(column, edge.getID());
}
column.flip();
if (!columnOnly) {
if (edge.isEdge()) {
long nodeIDDiff =
((TitanEdge) edge).getOtherVertex(perspective).getID() - perspective.getID();
int nodeIDDiffLength = VariableLong.length(nodeIDDiff);
if (et.isFunctional()) {
value =
ByteBuffer.allocate(nodeIDDiffLength + VariableLong.positiveLength(edge.getID()));
VariableLong.write(value, nodeIDDiff);
VariableLong.writePositive(value, edge.getID());
} else {
value = ByteBuffer.allocate(nodeIDDiffLength);
VariableLong.write(value, nodeIDDiff);
}
value.flip();
} else {
assert edge.isProperty();
DataOutput out = serializer.getDataOutput(defaultOutputCapacity, true);
// Write object
writeAttribute(out, (TitanProperty) edge);
if (et.isFunctional()) {
VariableLong.writePositive(out, edge.getID());
}
value = out.getByteBuffer();
}
}
} else {
TypeSignature ets = getSignature(tx, et, signatures);
InternalRelation[] keys = new InternalRelation[ets.keyLength()],
values = new InternalRelation[ets.valueLength()];
List<InternalRelation> rest = new ArrayList<InternalRelation>();
ets.sort(edge.getRelations(SimpleAtomicQuery.queryAll(edge), false), keys, values, rest);
DataOutput out = serializer.getDataOutput(defaultOutputCapacity, true);
IDHandler.writeEdgeType(out, etid, dirID, idManager);
for (int i = 0; i < keys.length; i++) writeInlineEdge(out, keys[i], ets.getKeyType(i));
if (!et.isFunctional()) {
VariableLong.writePositive(out, edge.getID());
}
column = out.getByteBuffer();
if (!columnOnly) {
out = serializer.getDataOutput(defaultOutputCapacity, true);
if (edge.isEdge()) {
long nodeIDDiff =
((TitanEdge) edge).getOtherVertex(perspective).getID() - perspective.getID();
VariableLong.write(out, nodeIDDiff);
} else {
assert edge.isProperty();
writeAttribute(out, (TitanProperty) edge);
}
if (et.isFunctional()) {
assert edge.isEdge();
VariableLong.writePositive(out, edge.getID());
}
for (int i = 0; i < values.length; i++)
writeInlineEdge(out, values[i], ets.getValueType(i));
for (InternalRelation v : rest) writeInlineEdge(out, v);
value = out.getByteBuffer();
}
}
return new Entry(column, value);
}
private List<Entry> queryForEntries(AtomicQuery query, TransactionHandle txh) {
ByteBuffer key = IDHandler.getKey(query.getVertexID());
List<Entry> entries = null;
LimitTracker limit = new LimitTracker(query);
boolean dirs[] = getAllowedDirections(query);
if (query.hasEdgeTypeCondition()) {
TitanType et = query.getTypeCondition();
if (!et.isNew()) { // Result set must be empty if TitanType is new
ArrayList<Object> applicableConstraints = null;
boolean isRange = false;
if (query.hasConstraints()) {
assert !et.isSimple();
TypeDefinition def = ((InternalTitanType) et).getDefinition();
String[] keysig = def.getKeySignature();
applicableConstraints = new ArrayList<Object>(keysig.length);
Map<String, Object> constraints = query.getConstraints();
for (int i = 0; i < keysig.length; i++) {
if (constraints.containsKey(keysig[i])) {
Object iv = constraints.get(keysig[i]);
applicableConstraints.add(iv);
if (iv != null && (iv instanceof AtomicInterval) && ((AtomicInterval) iv).isRange()) {
isRange = true;
break;
}
} else break;
}
if (applicableConstraints.isEmpty()) applicableConstraints = null;
}
for (int dirID = 0; dirID < 4; dirID++) {
if (dirs[dirID]) {
if (applicableConstraints != null) {
assert !applicableConstraints.isEmpty();
DataOutput start = serializer.getDataOutput(defaultOutputCapacity, true);
DataOutput end = null;
if (isRange) end = serializer.getDataOutput(defaultOutputCapacity, true);
IDHandler.writeEdgeType(start, et.getID(), dirID, idManager);
if (isRange) IDHandler.writeEdgeType(end, et.getID(), dirID, idManager);
// Write all applicable key constraints
for (Object iv : applicableConstraints) {
if (iv instanceof AtomicInterval) {
AtomicInterval interval = (AtomicInterval) iv;
if (interval.isPoint()) {
start.writeObject(interval.getStartPoint());
if (isRange) end.writeObject(interval.getStartPoint());
} else {
assert isRange;
assert interval.isRange();
ByteBuffer startColumn, endColumn;
if (interval.getStartPoint() != null) {
start.writeObject(interval.getStartPoint());
startColumn = start.getByteBuffer();
if (!interval.startInclusive())
startColumn = ByteBufferUtil.nextBiggerBuffer(startColumn);
} else {
assert interval.startInclusive();
startColumn = start.getByteBuffer();
}
if (interval.getEndPoint() != null) {
end.writeObject(interval.getEndPoint());
} else {
assert interval.endInclusive();
}
endColumn = end.getByteBuffer();
if (interval.endInclusive())
endColumn = ByteBufferUtil.nextBiggerBuffer(endColumn);
entries = appendResults(key, startColumn, endColumn, entries, limit, txh);
break; // redundant, this must be the last iteration because its a range
}
} else {
assert iv == null || (iv instanceof TitanVertex);
long id = 0;
if (iv != null) id = ((TitanVertex) iv).getID();
VariableLong.writePositive(start, id);
if (isRange) VariableLong.writePositive(end, id);
}
}
if (!isRange)
entries = appendResults(key, start.getByteBuffer(), entries, limit, txh);
} else {
ByteBuffer columnStart = IDHandler.getEdgeType(et.getID(), dirID, idManager);
entries = appendResults(key, columnStart, entries, limit, txh);
}
}
}
}
} else if (query.hasGroupCondition()) {
int groupid = query.getGroupCondition().getID();
for (int dirID = 0; dirID < 4; dirID++) {
if (dirs[dirID]) {
ByteBuffer columnStart = IDHandler.getEdgeTypeGroup(groupid, dirID, idManager);
entries = appendResults(key, columnStart, entries, limit, txh);
}
}
} else {
int lastDirID = -1;
for (int dirID = 0; dirID <= 4; dirID++) {
if ((dirID >= 4 || !dirs[dirID]) && lastDirID >= 0) {
ByteBuffer columnStart = IDHandler.getEdgeTypeGroup(0, lastDirID, idManager);
ByteBuffer columnEnd =
IDHandler.getEdgeTypeGroup(idManager.getMaxGroupID() + 1, dirID - 1, idManager);
entries = appendResults(key, columnStart, columnEnd, entries, limit, txh);
lastDirID = -1;
}
if (dirID < 4) {
if (dirs[dirID] && lastDirID == -1) lastDirID = dirID;
}
}
}
if (entries == null) return ImmutableList.of();
else return entries;
}
protected void loadRelations(
Iterable<Entry> entries, VertexRelationLoader loader, InternalTitanTransaction tx) {
Map<String, TitanType> etCache = new HashMap<String, TitanType>();
TitanType titanType = null;
for (Entry entry : entries) {
ByteBuffer column = entry.getColumn();
int dirID = IDHandler.getDirectionID(column.get(column.position()));
long etid = IDHandler.readEdgeType(column, idManager);
if (titanType == null || titanType.getID() != etid) {
titanType = getTypeFromID(etid, tx);
}
Object[] keys = null;
if (!titanType.isSimple()) {
TypeDefinition def = ((InternalTitanType) titanType).getDefinition();
String[] keysig = def.getKeySignature();
keys = new Object[keysig.length];
for (int i = 0; i < keysig.length; i++)
keys[i] = readInline(column, getEdgeType(keysig[i], etCache, tx));
}
long edgeid = 0;
if (!titanType.isFunctional()) {
edgeid = VariableLong.readPositive(column);
}
ByteBuffer value = entry.getValue();
if (titanType.isEdgeLabel()) {
long nodeIDDiff = VariableLong.read(value);
if (titanType.isFunctional()) edgeid = VariableLong.readPositive(value);
assert edgeid > 0;
long otherid = loader.getVertexId() + nodeIDDiff;
assert dirID == 3 || dirID == 2;
Direction dir = dirID == 3 ? Direction.IN : Direction.OUT;
if (!tx.isDeletedRelation(edgeid))
loader.loadEdge(edgeid, (TitanLabel) titanType, dir, otherid);
} else {
assert titanType.isPropertyKey();
assert dirID == 0;
TitanKey propType = ((TitanKey) titanType);
Object attribute = null;
if (hasGenericDataType(propType)) {
attribute = serializer.readClassAndObject(value);
} else {
attribute = serializer.readObjectNotNull(value, propType.getDataType());
}
assert attribute != null;
if (titanType.isFunctional()) edgeid = VariableLong.readPositive(value);
assert edgeid > 0;
if (!tx.isDeletedRelation(edgeid)) loader.loadProperty(edgeid, propType, attribute);
}
// Read value inline edges if any
if (!titanType.isSimple()) {
TypeDefinition def = ((InternalTitanType) titanType).getDefinition();
// First create all keys buffered above
String[] keysig = def.getKeySignature();
for (int i = 0; i < keysig.length; i++) {
createInlineEdge(loader, getEdgeType(keysig[i], etCache, tx), keys[i]);
}
// value signature
for (String str : def.getCompactSignature())
readLabel(loader, value, getEdgeType(str, etCache, tx));
// Third: read rest
while (value.hasRemaining()) {
TitanType type =
(TitanType) tx.getExistingVertex(IDHandler.readInlineEdgeType(value, idManager));
readLabel(loader, value, type);
}
}
}
}