How can I retrieve the total number of documents indexed by Lucene in 3.0.2?

I'm searching through开发者_运维百科 some documents, and I'd like to return the amount of matching documents against the amount of documents indexed.

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You could create a MatchAllDocsQuery which according to the javadocs states:

A query that matches all documents.

Otherwise perhaps the IndexReader might be useful:

IndexReader.open("path/to/index").numDocs();