org.apache.jackrabbit.oak.plugins.index.lucene

Class LuceneIndexStatistics

java.lang.Object

org.apache.jackrabbit.oak.plugins.index.lucene.LuceneIndexStatistics

All Implemented Interfaces:

org.apache.jackrabbit.oak.plugins.index.search.IndexStatistics

public class LuceneIndexStatistics
extends Object
implements org.apache.jackrabbit.oak.plugins.index.search.IndexStatistics

This class would populate some statistics from a reader. We want to be careful here such that we only collect statistics which don't incur reads from the index i.e. we would only collect stats that lucene would already have read into memory when the reader was opened.

Method Summary

Modifier and Type	Method and Description
int	getDocCountFor(String field)
int	numDocs()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

numDocs

public int numDocs()

Specified by:

numDocs in interface org.apache.jackrabbit.oak.plugins.index.search.IndexStatistics

Returns:

number of documents in the index

getDocCountFor

public int getDocCountFor(String field)

Specified by:

getDocCountFor in interface org.apache.jackrabbit.oak.plugins.index.search.IndexStatistics

Parameters:

field - Index field for which number of indexed documents are to be return

Returns:

number of indexed documents (without subtracting potentially deleted ones) for the given field.
-1: if index codec doesn't store doc-count-for-field statistics, OR
reader threw an exception while reading fields, OR
exception thrown while reading count for the field, OR
doc-count is asked for a non-property field.