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https://issues.apache.org/jira/browse/LUCENE-1831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12745688#action_12745688
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Uwe Schindler commented on LUCENE-1831:
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This class is used internally only. There is no need for hashCode(), the equals
is only needed for TeeSinkTokenStream, that compares the attribute factories.
Normally, factories are singletons, but this special case needs the extra
equals check because two wrapper factories are equal if the inner delegate is
equal.
> TokenWrapperAttributeFactory, CachingWrapperFilterHelper implements equals
> and so should also implement hashCode
> ----------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-1831
> URL: https://issues.apache.org/jira/browse/LUCENE-1831
> Project: Lucene - Java
> Issue Type: Bug
> Components: Analysis
> Reporter: Mark Miller
> Assignee: Mark Miller
> Priority: Minor
> Fix For: 2.9
>
>
> its part of the contract of Object
> bq. If two objects are equal according to the equals(Object) method, then
> calling the hashCode method on each of the two objects must produce the same
> integer result.
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