org.cdlib.xtf.textEngine
Class XtfQueryRewriter

Object
  QueryRewriter
      XtfQueryRewriter

Direct Known Subclasses:

AccentFoldingRewriter, PluralFoldingRewriter, RefieldingQueryRewriter, SlopFixupRewriter, SpellSuggRewriter, StdTermRewriter, UnicodeNormalizingRewriter, UnspanningQueryRewriter

public abstract class XtfQueryRewriter
extends QueryRewriter

Utility class for performing external rewriting, or transformation, tasks on Lucene queries. The base class simply provides a framework. Derived classes should override methods for those parts of a query they need to rewrite, and the base will take care of gluing them together properly.

Nested Class Summary

Nested classes/interfaces inherited from class QueryRewriter

QueryRewriter.SpanClauseJoiner

Constructor Summary

XtfQueryRewriter()

Method Summary

protected Query	rewrite(MoreLikeThisQuery mlt) Rewrite a "more like this" query
protected Query	rewrite(NumericRangeQuery nrq) Rewrite a numeric range query
protected Query	rewrite(SpanExactQuery q) Rewrite an exact query.
protected Query	rewrite(SpanSectionTypeQuery stq) Rewrite a section type query.
Query	rewriteQuery(Query q) Rewrite a query of any supported type.

Methods inherited from class QueryRewriter

combineBoost, copyBoost, copyBoost, forceRewrite, rewrite, rewrite, rewrite, rewrite, rewrite, rewrite, rewrite, rewrite, rewrite, rewrite, rewrite, rewrite, rewriteClauses

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

XtfQueryRewriter

public XtfQueryRewriter()

Method Detail

rewriteQuery

public Query rewriteQuery(Query q)

Rewrite a query of any supported type.

Overrides:

rewriteQuery in class QueryRewriter

Parameters:

q - Query to rewrite

Returns:

A new query, or 'q' unchanged if no change was needed.

rewrite

protected Query rewrite(SpanSectionTypeQuery stq)

Rewrite a section type query. If's very simple: simply rewrite the sub-queries.

Parameters:

stq - The query to rewrite

Returns:

Rewritten version, or 'nq' unchanged if no changed needed.

rewrite

protected Query rewrite(SpanExactQuery q)

Rewrite an exact query. The base class rewrites each of the sub-clauses.

rewrite

protected Query rewrite(MoreLikeThisQuery mlt)

Rewrite a "more like this" query

rewrite

protected Query rewrite(NumericRangeQuery nrq)

Rewrite a numeric range query