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https://issues.apache.org/jira/browse/LUCENE-1923?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Smith updated LUCENE-1923:
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    Attachment: LUCENE-1923.patch

Here's a simple patch to get the ball rolling

This adds a "getName() method to IndexReader

the default implementation will be:
SimleClassName(subreader.getName(), subreader.getName(), ...)

SegmentReader will return same value as getSegmentName()

DirectoryReader will return:
DirectoryReader(segment_N, segment.getName(), segment.getName(), ...)

ParallelReader will return:
ParallelReader(parallelReader1.getName(), parallelReader2.getName(), ...)

this currently does not have a toString() implementation return getName() 

do with this patch as you will


> Add toString() or getName() method to IndexReader
> -------------------------------------------------
>
>                 Key: LUCENE-1923
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1923
>             Project: Lucene - Java
>          Issue Type: Wish
>          Components: Index
>            Reporter: Tim Smith
>         Attachments: LUCENE-1923.patch
>
>
> It would be very useful for debugging if IndexReader either had a getName() 
> method, or a toString() implementation that would get a string identification 
> for the reader.
> for SegmentReader, this would return the same as getSegmentName()
> for Directory readers, this would return the "generation id"?
> for MultiReader, this could return something like "multi(sub reader name, sub 
> reader name, sub reader name, ...)
> right now, i have to check instanceof for SegmentReader, then call 
> getSegmentName(), and for all other IndexReader types, i would have to do 
> something like get the IndexCommit and get the generation off it (and this 
> may throw UnsupportedOperationException, at which point i have would have to 
> recursively walk sub readers and try again)
> I could work up a patch if others like this idea

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