Hello,
> Karthik N S [mailto:[EMAIL PROTECTED]
>
> Has Somebody out there tried DELETING/UPDATION of
> INDEXED Files from a
> MERGED Index Format,
> If HowTo do this Please Explain....
Of course you can delete or update a document from a merged index.
It works in the same way as for all other indexes. You need an
unique key (e.g. the file name or uri), which is indexed
for searching, to find the right document, because the internal
document numbers are changed after merging indexes or deleting
documents and optimizing an index. Using this key you can search
for the document and remove it. It doesn't matter if your index
was created by merging serveral indexes or not.
Example:
/* Create index: */
Document document = new Document();
document.add(Field.Keyword("filename", file_name)); // this must be
unique for each document!
document.add(Field.Text("content", file_content));
writer.addDocument(document);
/* ... */
writer.close();
/* Update or remove document: Use the file name to find the original
document and remove it from index */
FSDirectory indexDirectory = FSDirectory.getDirectory("indexPath", false);
IndexReader indexReader = IndexReader.open(indexDirectory);
IndexSearcher indexSearcher = new IndexSearcher(indexReader);
// create query and search for document using its filename
TermQuery query = new TermQuery(new Term("filename", file_name));
Hits hits = indexSearcher.search(query);
if ( hits.length() > 0 ) {
// remove the document from index
int docID = hits.id(0);
indexReader.delete( docID );
}
// else: this is a new file or already removed, so we can simply add it.
indexSearcher.close();
indexReader.close();
indexDirectory.close();
// now open an IndexWriter for the same index and add the updated file
// as new document....
/* done */
Hope it helps. Regards,
Wolf-Dietrich Materna
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