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From "Nitzan Shaked (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-5674) A new token filter: SubSequence
Date Sun, 18 May 2014 09:30:16 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-5674?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nitzan Shaked updated LUCENE-5674:
----------------------------------

    Description: 
A new configurable token filter which, given a token breaks it into sub-parts and outputs
consecutive sub-sequences of those sub-parts.

Useful for, for example, using during indexing to generate variations on domain names, so
that "www.google.com" can be found by searching for "google.com", or "www.google.com".

Parameters:

sepRegexp: A regular expression used split incoming tokens into sub-parts.
glue: A string used to concatenate sub-parts together when creating sub-sequences.
minLen: Minimum length (in sub-parts) of output sub-sequences
maxLen: Maximum length (in sub-parts) of output sub-sequences (0 for unlimited; negative numbers
for token length in sub-parts minus specified length)
anchor: Anchor.START to output only prefixes, or Anchor.END to output only suffixes, or Anchor.NONE
to output any sub-sequence
withOriginal: whether to output also the original token

EDIT: now includes tests for filter and for factory.

  was:
A new configurable token filter which, given a token breaks it into sub-parts and outputs
consecutive sub-sequences of those sub-parts.

Useful for, for example, using during indexing to generate variations on domain names, so
that "www.google.com" can be found by searching for "google.com", or "www.google.com".

Parameters:

sepRegexp: A regular expression used split incoming tokens into sub-parts.
glue: A string used to concatenate sub-parts together when creating sub-sequences.
minLen: Minimum length (in sub-parts) of output sub-sequences
maxLen: Maximum length (in sub-parts) of output sub-sequences (0 for unlimited; negative numbers
for token length in sub-parts minus specified length)
anchor: Anchor.START to output only prefixes, or Anchor.END to output only suffixes, or Anchor.NONE
to output any sub-sequence
withOriginal: whether to output also the original token

Note: tests will follow, I currently believe BaseTokenStreamTestCase is broken/mis-designed
for such use cases, I will open a separate Jira for that.


> A new token filter: SubSequence
> -------------------------------
>
>                 Key: LUCENE-5674
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5674
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/other
>            Reporter: Nitzan Shaked
>            Priority: Minor
>         Attachments: subseqfilter.patch
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> A new configurable token filter which, given a token breaks it into sub-parts and outputs
consecutive sub-sequences of those sub-parts.
> Useful for, for example, using during indexing to generate variations on domain names,
so that "www.google.com" can be found by searching for "google.com", or "www.google.com".
> Parameters:
> sepRegexp: A regular expression used split incoming tokens into sub-parts.
> glue: A string used to concatenate sub-parts together when creating sub-sequences.
> minLen: Minimum length (in sub-parts) of output sub-sequences
> maxLen: Maximum length (in sub-parts) of output sub-sequences (0 for unlimited; negative
numbers for token length in sub-parts minus specified length)
> anchor: Anchor.START to output only prefixes, or Anchor.END to output only suffixes,
or Anchor.NONE to output any sub-sequence
> withOriginal: whether to output also the original token
> EDIT: now includes tests for filter and for factory.



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