@Override
public Map.Entry<RdfCloudTripleStoreConstants.TABLE_LAYOUT, ByteRange> defineRange(
RyaURI subject,
RyaURI predicate,
RyaType object,
RyaURI context,
RdfCloudTripleStoreConfiguration conf)
throws IOException {
try {
// po(ng)
// po_r(s)(ng)
// p(ng)
// p_r(o)(ng)
// r(p)(ng)
if (!handles(subject, predicate, object, context)) return null;
RyaContext ryaContext = RyaContext.getInstance();
MessageDigest md = MessageDigest.getInstance("MD5");
RdfCloudTripleStoreConstants.TABLE_LAYOUT table_layout =
RdfCloudTripleStoreConstants.TABLE_LAYOUT.PO;
byte[] start, stop;
if (object != null) {
if (object instanceof RyaRange) {
// p_r(o)
RyaRange rv = (RyaRange) object;
rv = ryaContext.transformRange(rv);
byte[] objStartBytes = ryaContext.serializeType(rv.getStart())[0];
byte[] objEndBytes = ryaContext.serializeType(rv.getStop())[0];
byte[] predBytes = predicate.getData().getBytes();
byte[] predHash = md.digest(predBytes);
start = Bytes.concat(predHash, DELIM_BYTES, predBytes, DELIM_BYTES, objStartBytes);
stop =
Bytes.concat(
predHash,
DELIM_BYTES,
predBytes,
DELIM_BYTES,
objEndBytes,
DELIM_BYTES,
LAST_BYTES);
} else {
if (subject != null && subject instanceof RyaRange) {
// po_r(s)
RyaRange ru = (RyaRange) subject;
ru = ryaContext.transformRange(ru);
byte[] subjStartBytes = ru.getStart().getData().getBytes();
byte[] subjStopBytes = ru.getStop().getData().getBytes();
byte[] predBytes = predicate.getData().getBytes();
byte[] predHash = md.digest(predBytes);
byte[] objBytes = ryaContext.serializeType(object)[0];
start =
Bytes.concat(
predHash,
DELIM_BYTES,
predBytes,
DELIM_BYTES,
objBytes,
DELIM_BYTES,
subjStartBytes);
stop =
Bytes.concat(
predHash,
DELIM_BYTES,
predBytes,
DELIM_BYTES,
objBytes,
DELIM_BYTES,
subjStopBytes,
TYPE_DELIM_BYTES,
LAST_BYTES);
} else {
// po
// TODO: There must be a better way than creating multiple byte[]
byte[] predBytes = predicate.getData().getBytes();
byte[] predHash = md.digest(predBytes);
byte[] objBytes = ryaContext.serializeType(object)[0];
start =
Bytes.concat(predHash, DELIM_BYTES, predBytes, DELIM_BYTES, objBytes, DELIM_BYTES);
stop = Bytes.concat(start, LAST_BYTES);
}
}
} else {
// p
byte[] predBytes = predicate.getData().getBytes();
byte[] predHash = md.digest(predBytes);
start = Bytes.concat(predHash, DELIM_BYTES, predBytes, DELIM_BYTES);
stop = Bytes.concat(start, LAST_BYTES);
}
return new RdfCloudTripleStoreUtils.CustomEntry<
RdfCloudTripleStoreConstants.TABLE_LAYOUT, ByteRange>(
table_layout, new ByteRange(start, stop));
} catch (RyaTypeResolverException e) {
throw new IOException(e);
} catch (NoSuchAlgorithmException e) {
throw new IOException(e);
}
}
