Provide an convenience AttributeFactory that implements all default attributes 
with Token
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                 Key: LUCENE-1933
                 URL: https://issues.apache.org/jira/browse/LUCENE-1933
             Project: Lucene - Java
          Issue Type: Improvement
    Affects Versions: 2.9
            Reporter: Uwe Schindler
            Assignee: Uwe Schindler
             Fix For: 3.0


I found some places in contrib tests, where the Token.class was added using 
addAttributeImpl(). The problem here is, that you cannot be sure, that the 
attribute is really added and you may fail later (because you only update your 
local instance). The tests in contrib will partially fail with 3.0 without 
backwards layer (because the backwards layer uses Token/TokenWrapper internally 
and copyTo() will work.

The correct way to achieve this is using an AttributeFactory. The 
AttributeFactory is currently private in EmptyTokenTokenStream. I want to move 
it to Token.java as a static class / static member. In this case the tests can 
be rewritten

I also want to mark addAttributeImpl() as EXPERT, because you must really know 
whats happening and what are the traps.

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