add getFinalOffset() to TokenStream
-----------------------------------
Key: LUCENE-1448
URL: https://issues.apache.org/jira/browse/LUCENE-1448
Project: Lucene - Java
Issue Type: Bug
Components: Analysis
Reporter: Michael McCandless
Assignee: Michael McCandless
Fix For: 2.9
If you add multiple Fieldable instances for the same field name to a document,
and you then index those fields with TermVectors storing offsets, it's very
likely the offsets for all but the first field instance will be wrong.
This is because IndexWriter under the hood adds a cumulative base to the
offsets of each field instance, where that base is 1 + the endOffset of the
last token it saw when analyzing that field.
But this logic is overly simplistic. For example, if the WhitespaceAnalyzer is
being used, and the text being analyzed ended in 3 whitespace characters, then
that information is lost and then next field's offsets are then all 3 too
small. Similarly, if a StopFilter appears in the chain, and the last N tokens
were stop words, then the base will be 1 + the endOffset of the last
non-stopword token.
To fix this, I'd like to add a new getFinalOffset() to TokenStream. I'm
thinking by default it returns -1, which means "I don't know so you figure it
out", meaning we fallback to the faulty logic we have today.
This has come up several times on the user's list.
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