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https://issues.apache.org/jira/browse/LUCENE-1320?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Karl Wettin updated LUCENE-1320:
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Attachment: LUCENE-1320.txt
This works pretty well, I'll commit it soon.
* javadocs
* improved default shingle token weights (still not that great)
Also optimized and refactored some that resulted in nicer looking code in the
tests and:
* PrefixAwareTokenFilter
* PrefixAndSuffixAwareTokenFilter
* SingleTokenTokenStream
{code:java}
/**
* Joins two token streams and leaves the last token of the prefix stream
available
* to be used when updating the token values in the second stream based on that
token.
*/
public class PrefixAwareTokenFilter extends TokenStream {
/** The default implementation adds last prefix token end offset to the
suffix token start and end offsets. */
public Token updateSuffixToken(Token suffixToken, Token lastPrefixToken) {
{code}
{code:java}
/** Links two PrefixAndSuffixAwareTokenFilter */
public class PrefixAndSuffixAwareTokenFilter extends TokenStream {
public Token updateInputToken(Token inputToken, Token lastPrefixToken) {
public Token updateSuffixToken(Token suffixToken, Token lastInputToken) {
{code}
> ShingleMatrixFilter, a three dimensional permutating shingle filter
> -------------------------------------------------------------------
>
> Key: LUCENE-1320
> URL: https://issues.apache.org/jira/browse/LUCENE-1320
> Project: Lucene - Java
> Issue Type: New Feature
> Components: contrib/analyzers
> Affects Versions: 2.3.2
> Reporter: Karl Wettin
> Assignee: Karl Wettin
> Attachments: LUCENE-1320.txt, LUCENE-1320.txt
>
>
> Backed by a column focused matrix that creates all permutations of shingle
> tokens in three dimensions. I.e. it handles multi token synonyms.
> Could for instance in some cases be used to replaces 0-slop phrase queries
> with something speedier.
> {code:java}
> Token[][][]{
> {{hello}, {greetings, and, salutations}},
> {{world}, {earth}, {tellus}}
> }
> {code}
> passes the following test with 2-3 grams:
> {code:java}
> assertNext(ts, "hello_world");
> assertNext(ts, "greetings_and");
> assertNext(ts, "greetings_and_salutations");
> assertNext(ts, "and_salutations");
> assertNext(ts, "and_salutations_world");
> assertNext(ts, "salutations_world");
> assertNext(ts, "hello_earth");
> assertNext(ts, "and_salutations_earth");
> assertNext(ts, "salutations_earth");
> assertNext(ts, "hello_tellus");
> assertNext(ts, "and_salutations_tellus");
> assertNext(ts, "salutations_tellus");
> {code}
> Contains more and less complex tests that demonstrate offsets, posincr,
> payload boosts calculation and construction of a matrix from a token stream.
> The matrix attempts to hog as little memory as possible by seeking no more
> than maximumShingleSize columns forward in the stream and clearing up unused
> resources (columns and unique token sets). Can still be optimized quite a bit
> though.
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