gistfile1.java

import java.io.File;
import java.io.IOException;

import org.apache.lucene.codecs.*;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.*;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.BytesRef;

public class IndexReaderTest {

	
	public static void main (String ... args) {
		try{
			IndexReader ir = DirectoryReader.open(FSDirectory.open(new File("/Users/shriphani/Documents/Summer2013/lucene-4.3.0/index")));
			
			// Number of Documents in the index directory
			System.out.println(ir.numDocs());
			
			// List all the terms, their TFs and DFs 
			AtomicReader ar = SlowCompositeReaderWrapper.wrap(ir);
			for (String field : ar.fields()) {
				System.out.println(field);
				Terms ts = ar.fields().terms(field);
				TermsEnum tes = ts.iterator(null);
				BytesRef text;
				while ((text = tes.next()) != null) {
					System.out.print("field=" + field + "; text=" + text.utf8ToString() + "; tf= ");
					DocsEnum de = ar.termDocsEnum(new Term(field, text));
					System.out.println(de.nextDoc());
					System.out.println(de.nextDoc());
					System.out.println(de.nextDoc());
				}
			}
			
		} catch (IOException e) {
			System.out.println(e.getMessage());
		}
	}
}