private NodeRecord readNodeRecord(long id) throws IOException {
byte inUseFlag = channel.get();
boolean inUse = false;
if (inUseFlag == Record.IN_USE.byteValue()) {
inUse = true;
} else if (inUseFlag != Record.NOT_IN_USE.byteValue()) {
throw new IOException("Illegal in use flag: " + inUseFlag);
}
NodeRecord record;
if (inUse) {
record = new NodeRecord(id, false, channel.getLong(), channel.getLong());
// labels
long labelField = channel.getLong();
Collection<DynamicRecord> dynamicLabelRecords = new ArrayList<>();
readDynamicRecords(dynamicLabelRecords, COLLECTION_DYNAMIC_RECORD_ADDER);
record.setLabelField(labelField, dynamicLabelRecords);
} else {
record =
new NodeRecord(
id,
false,
Record.NO_NEXT_RELATIONSHIP.intValue(),
Record.NO_NEXT_PROPERTY.intValue());
}
record.setInUse(inUse);
return record;
}
@Override
public long nextPosition(long nextPosition, DirectionWrapper direction, int[] types) {
currentPosition.nextPosition(nextPosition, direction, types);
if (nextPosition != Record.NO_NEXT_RELATIONSHIP.intValue()) {
return nextPosition;
}
return position(direction, types);
}
public RecordProxy<Long, RelationshipGroupRecord, Integer> getRelationshipGroup(
NodeRecord node, int type) {
long groupId = node.getNextRel();
long previousGroupId = Record.NO_NEXT_RELATIONSHIP.intValue();
Set<Integer> allTypes = new HashSet<>();
while (groupId != Record.NO_NEXT_RELATIONSHIP.intValue()) {
RecordProxy<Long, RelationshipGroupRecord, Integer> change =
recordChangeSet.getRelGroupRecords().getOrLoad(groupId, type);
RelationshipGroupRecord record = change.forReadingData();
record.setPrev(previousGroupId); // not persistent so not a "change"
allTypes.add(record.getType());
if (record.getType() == type) {
return change;
}
previousGroupId = groupId;
groupId = record.getNext();
}
return null;
}
TypePosition(RelationshipGroupRecord record) {
for (DirectionWrapper direction : DirectionWrapper.values()) {
long firstRel = direction.getNextRel(record);
directions.put(
direction,
firstRel != Record.NO_NEXT_RELATIONSHIP.intValue()
? new SingleChainPosition(firstRel)
: RelationshipLoadingPosition.EMPTY);
}
}
@Override
public long position(DirectionWrapper direction, int[] types) {
if (types.length == 0) {
types = this.types;
}
for (int type : types) {
RelationshipLoadingPosition position = getTypePosition(type);
if (position.hasMore(direction, types)) {
currentPosition = position;
return position.position(direction, types);
}
}
return Record.NO_NEXT_RELATIONSHIP.intValue();
}
@Override
public long position(DirectionWrapper direction, int[] types) {
if (direction == DirectionWrapper.BOTH) {
for (RelationshipLoadingPosition position : directions.values()) {
if (position.hasMore(direction, types)) {
currentPosition = position;
return position.position(direction, types);
}
}
} else {
for (DirectionWrapper dir : new DirectionWrapper[] {direction, DirectionWrapper.BOTH}) {
RelationshipLoadingPosition position = directions.get(dir);
if (position.hasMore(dir, types)) {
currentPosition = position;
return position.position(dir, types);
}
}
}
return Record.NO_NEXT_RELATIONSHIP.intValue();
}
