@Override
public @NonNull URL getUrl(final @NonNull NodesTransaction txn, final @NonNull NodeId nodeId) {
final Datum datum = txn.getDatum(nodeId);
if (!(datum instanceof StringDatum))
throw new DataTypeException(nodeId, datum.getType(), StringDatumType.INSTANCE, getNodeId());
final StringDatum stringDatum = (StringDatum) datum;
final String string = stringDatum.getValue();
try {
return new URL(string);
} catch (final MalformedURLException e) {
throw new RuntimeException(e);
}
}
@Override
public void updateIndex(
final @NonNull NodesTransaction txn, final @NonNull NodeId nodeId, final boolean deferred) {
final ValidatingKernel kernel = k1Reactor.getInstance();
final Queue queue = queueReactor.getInstance();
final WordMeaning wordMeaning = wordMeaningReactor.getInstance();
final WordParentMeaning wordParentMeaning = wordParentMeaningReactor.getInstance();
final MimeTypeMeaning mimeTypeMeaning = mimeTypeMeaningReactor.getInstance();
final LocaleMeaning localeMeaning = localeMeaningReactor.getInstance();
final Coordinator coordinator = coordReactor.getInstance();
final Reservation reservation =
coordinator.reserve(
CoordinatorUtil.makeSetOfRules(new BaseNodeRule(nodeId)),
CoordinatorUtil.makeSetOfIntents(new BaseNodeIntent(nodeId)));
try {
final Datum datum = txn.getDatum(nodeId);
final MimeType mimeType = mimeTypeMeaning.getMimeType(txn, nodeId);
final Locale locale = localeMeaning.getLocale(txn, nodeId);
final List<Stemmer> stemmers = StemmerUtil.getStemmers(bundleContext, locale);
WordParser parser;
if (mimeType != null) {
parser = getParser(mimeType.toString());
} else if (datum instanceof StringDatum) {
parser = getParser("text/plain");
} else {
parser = null;
}
if (parser == null) return;
Cursor<NodeId> cursor = null;
final Map<String, NodeId> oldIndexEntries = new HashMap<String, NodeId>();
final Set<NodeId> oldNodesToDelete = new HashSet<NodeId>();
try {
cursor = txn.fetchSourceNodes(nodeId, wordParentMeaning.getNodeId());
for (final NodeId linkNodeId : cursor) {
if (linkNodeId != null) {
final NodeId wordNodeId = txn.getTarget(linkNodeId, wordMeaning.getNodeId());
if (wordNodeId != null) {
final Datum wordDatum = txn.getDatum(wordNodeId);
if (wordDatum instanceof StringDatum) {
final String indexEntry = ((StringDatum) wordDatum).getValue();
final NodeId oldLinkNodeId = oldIndexEntries.get(indexEntry);
if (oldLinkNodeId != null) {
// get rid of redundant link
oldNodesToDelete.add(linkNodeId);
} else {
oldIndexEntries.put(indexEntry, linkNodeId);
}
}
}
}
}
} finally {
if (cursor != null) cursor.close();
}
// enqueue deletes for all redundant links
for (final NodeId linkNodeId : oldNodesToDelete) {
if (linkNodeId != null) {
final QueueOperation op =
new DeleteIndexLinkOperation(
kernel,
nodeId,
linkNodeId,
wordParentMeaning.getNodeId(),
wordMeaning.getNodeId());
if (deferred) {
queue.add(op, 0);
queue.start();
} else op.execute();
}
}
Reader reader;
try {
reader = new InputStreamReader(datum.getInputStream());
} catch (final IOException e) {
// TODO log something
reader = null;
}
if (reader == null) return;
final Set<String> newStemmedWords = new HashSet<String>();
Set<String> words = new HashSet<String>();
for (final String word : parser.parse(reader)) {
if (word != null) {
words.add(word);
}
}
for (final Stemmer stemmer : stemmers) {
if (stemmer != null) {
words = stemmer.stem(words);
}
}
newStemmedWords.addAll(words);
for (final String word : newStemmedWords) {
if (word != null) {
final NodeId oldLinkNodeId = oldIndexEntries.get(word);
if (oldLinkNodeId != null) {
oldIndexEntries.remove(word);
} else {
final QueueOperation op =
new IndexOperation(
kernel,
wicpReactor,
coordReactor,
word,
nodeId,
wordParentMeaning.getNodeId(),
wordMeaning.getNodeId());
queue.add(op, 0);
}
}
}
// enqueue deletes for all old word links that no longer apply
for (final NodeId linkNodeId : oldIndexEntries.values()) {
if (linkNodeId != null) {
final QueueOperation op =
new DeleteIndexLinkOperation(
kernel,
nodeId,
linkNodeId,
wordParentMeaning.getNodeId(),
wordMeaning.getNodeId());
if (deferred) queue.add(op, 0);
else op.execute();
}
}
} finally {
reservation.release();
}
}