/**
* Creates a set of reference objects and stores it in a new index (name "<indexPath>-ro"). Then
* creates ordered lists of reference object positions for each data item in the index with given
* feature. Finally a new index (name "<indexPath>-ms") is created where all the original
* documents as well as the new data are stored.
*
* @param indexPath the path to the original index
* @throws IOException
*/
public void createIndex(String indexPath) throws IOException {
IndexReader reader = DirectoryReader.open(FSDirectory.open(new File(indexPath)));
int numDocs = reader.numDocs();
if (numDocs < numReferenceObjects) {
throw new UnsupportedOperationException("Too few documents in index.");
}
// progress report
progress.setNumDocsAll(numDocs);
progress.setCurrentState(State.RoSelection);
boolean hasDeletions = reader.hasDeletions();
// init reference objects:
IndexWriter iw = LuceneUtils.createIndexWriter(indexPath + "-ro", true);
HashSet<Integer> referenceObjsIds = new HashSet<Integer>(numReferenceObjects);
double numDocsDouble = (double) numDocs;
while (referenceObjsIds.size() < numReferenceObjects) {
referenceObjsIds.add((int) (numDocsDouble * Math.random()));
}
int count = 0;
if (hasDeletions) {
System.err.println(
"WARNING: There are deleted docs in your index. You should "
+ "optimize your index before using this method.");
}
// progress report
progress.setCurrentState(State.RoIndexing);
// find them in the index and put them into a separate index:
for (int i : referenceObjsIds) {
count++;
Document document = reader.document(i);
document.add(new Field("ro-id", count + "", StringField.TYPE_STORED));
iw.addDocument(document);
}
iw.commit();
iw.close();
// progress report
progress.setCurrentState(State.Indexing);
// now find the reference objects for each entry ;)
IndexReader readerRo = DirectoryReader.open(FSDirectory.open(new File(indexPath + "-ro")));
ImageSearcher searcher =
new GenericImageSearcher(numReferenceObjectsUsed, featureClass, featureFieldName);
Map<String, Analyzer> analyzerPerField = new HashMap<String, Analyzer>();
analyzerPerField.put("ro-order", new WhitespaceAnalyzer(LuceneUtils.LUCENE_VERSION));
PerFieldAnalyzerWrapper aWrapper =
new PerFieldAnalyzerWrapper(
new SimpleAnalyzer(LuceneUtils.LUCENE_VERSION), analyzerPerField);
iw =
new IndexWriter(
FSDirectory.open(new File(indexPath)),
new IndexWriterConfig(LuceneUtils.LUCENE_VERSION, aWrapper)
.setOpenMode(IndexWriterConfig.OpenMode.CREATE));
StringBuilder sb = new StringBuilder(256);
// Needed for check whether the document is deleted.
Bits liveDocs = MultiFields.getLiveDocs(reader);
for (int i = 0; i < numDocs; i++) {
if (reader.hasDeletions() && !liveDocs.get(i)) continue; // if it is deleted, just ignore it.
Document document = reader.document(i);
ImageSearchHits hits = searcher.search(document, readerRo);
sb.delete(0, sb.length());
for (int j = 0; j < numReferenceObjectsUsed; j++) {
sb.append(hits.doc(j).getValues("ro-id")[0]);
sb.append(' ');
}
// System.out.println(sb.toString());
document.add(new TextField("ro-order", sb.toString(), Field.Store.YES));
iw.updateDocument(
new Term(
DocumentBuilder.FIELD_NAME_IDENTIFIER,
document.getValues(DocumentBuilder.FIELD_NAME_IDENTIFIER)[0]),
document);
// progress report
progress.setNumDocsProcessed(progress.getNumDocsProcessed() + 1);
}
iw.commit();
iw.close();
// progress report
progress.setCurrentState(State.Idle);
}
