[jira] Updated: (LUCENENET-102) GermanStemmer.cs has numerous string substring errors

["Stefan Rusek (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENENET-102?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stefan Rusek updated LUCENENET-102:
-----------------------------------

    Attachment: GermanStemmer.cs.diff

This is the diff that will fix the problem.

> GermanStemmer.cs has numerous string substring errors
> -----------------------------------------------------
>
>                 Key: LUCENENET-102
>                 URL: https://issues.apache.org/jira/browse/LUCENENET-102
>             Project: Lucene.Net
>          Issue Type: Bug
>         Environment: Lucene.Net 2.0 using the GermanStemmer
>            Reporter: Stefan Rusek
>         Attachments: GermanStemmer.cs.diff
>
>
> When using the german stemmer that is included in the 2.0 release. The stemmer will throw ArgumentOutOfRangeException. We have fixed the issue in-house but wanted to get the fix incorporated into the actual Lucene.Net release so that future users don't have this problem. Below is an example stacktrace, and I will attach a diff as well.
> System.ArgumentOutOfRangeException: Index and length must refer to a location within the string.
> Parameter name: length
>   at System.String.InternalSubStringWithChecks(Int32 startIndex, Int32 length, Boolean fAlwaysCopy)
>   at Lucene.Net.Analysis.DE.GermanStemmer.Strip(StringBuilder buffer) in c:\src-hosted\fogcreek\FogBugz\FogUtil.Search\FogUtil.Search\Lucene.Net\Analysis\DE\GermanStemmer.cs:line 88
>   at Lucene.Net.Analysis.DE.GermanStemmer.Stem(String term) in c:\src-hosted\fogcreek\FogBugz\FogUtil.Search\FogUtil.Search\Lucene.Net\Analysis\DE\GermanStemmer.cs:line 54
>   at Lucene.Net.Analysis.DE.GermanStemFilter.Next() in c:\src-hosted\fogcreek\FogBugz\FogUtil.Search\FogUtil.Search\Lucene.Net\Analysis\DE\GermanStemFilter.cs:line 67
>   at Lucene.Net.Index.DocumentWriter.InvertDocument(Document doc) in c:\src-hosted\fogcreek\FogBugz\FogUtil.Search\FogUtil.Search\Lucene.Net\Index\DocumentWriter.cs:line 181
>   at Lucene.Net.Index.DocumentWriter.AddDocument(String segment, Document doc) in c:\src-hosted\fogcreek\FogBugz\FogUtil.Search\FogUtil.Search\Lucene.Net\Index\DocumentWriter.cs:line 106
>   at Lucene.Net.Index.IndexWriter.AddDocument(Document doc, Analyzer analyzer) in c:\src-hosted\fogcreek\FogBugz\FogUtil.Search\FogUtil.Search\Lucene.Net\Index\IndexWriter.cs:line 626
>   at Lucene.Net.Index.IndexWriter.AddDocument(Document doc) in c:\src-hosted\fogcreek\FogBugz\FogUtil.Search\FogUtil.Search\Lucene.Net\Index\IndexWriter.cs:line 613

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