You may not have noticed that CharFilter extends Reader. The expected
pattern here is that you chain instances together -- your CharFilter
should act as *input* to the Analyzer, I think. Don't think in terms of
extending these analysis classes (except the base ones designed for it):
compose them so that each consumes the one before it
-Mike
On 6/11/2013 7:52 PM, Steven Schlansker wrote:
Hi everyone,
I am trying to add a CharFilter to my Analyzer. I started with a StandardAnalyzer wrapped with an ASCIIFoldingFilter.
Then I realized that it does not handle searches for names that include punctuation well, for example I want a
PrefixQuery "pf" to match "P.F. Chang's" or "zaras" to match "Zara's".
It seems that the easiest plan of attack here is to filter out all punctuation
before analysis. Per the Analyzer package documentation, that means I should
use a CharFilter.
However, it seems next to impossible to actually insert a CharFilter into the
analyzer!
The JavaDoc for Analyzer.initReader says "Override this if you want to insert a
CharFilter".
If my code extends Analyzer, I can extend initReader but I cannot delegate
createComponents to my base StandardAnalyzer, as it is protected. I cannot
delegate tokenStream to my base analyzer, because it is final. So a subclass
of Analyzer seemingly cannot use another Analyzer to do its dirty work.
There is an AnalyzerWrapper class that seems perfect for what I want! I can provide a
base analyzer and only override the pieces that I want. Except … initReader is
overridden already to delegate to the base analyzer, and this override is
"final"! Bummer!
I guess I could have my Analyzer be in the org.apache.lucene.analyzers package
and then I can access the protected createComponents method, but this seems
like a disgustingly hacky way to bypass the public API that I really should use.
Am I missing something glaring here? How can I amend a StandardAnalyzer to use
a custom CharFilter?
Thanks for any guidance,
Steven
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