org.cdlib.xtf.textEngine

Class SlopFixupRewriter

Object

QueryRewriter

XtfQueryRewriter

SlopFixupRewriter

public class SlopFixupRewriter
extends XtfQueryRewriter

Fix up all the "infinite" slop entries to be actually limited to the chunk overlap size. That way, we'll get consistent results and the user won't be able to tell where the chunk boundaries are. Also attaches a DocNumMap to each SpanDechunkingQuery.

Author:

Martin Haye

Nested Class Summary

Nested classes/interfaces inherited from class QueryRewriter

QueryRewriter.SpanClauseJoiner

Field Summary

Fields

Modifier and Type	Field and Description
private CharMap	accentMap
private DocNumMap	docNumMap
private WordMap	pluralMap
private Set	stopSet

Constructor Summary

Constructors

Constructor and Description
SlopFixupRewriter(DocNumMap docNumMap, Set stopSet, WordMap pluralMap, CharMap accentMap) Construct a new rewriter

Method Summary

Modifier and Type	Method and Description
boolean	forceRewrite(Query q) Can be used to force some or all queries to be rewritten even if no changes.
Query	rewrite(MoreLikeThisQuery q) Rewrite a "more like this" query
Query	rewrite(SpanChunkedNotQuery nq) Rewrite a span-based NOT query.
Query	rewrite(SpanDechunkingQuery q) Rewrite a span dechunking query.
Query	rewrite(SpanNearQuery nq) Rewrite a span NEAR query.
Query	rewrite(SpanOrNearQuery nq) Rewrite a span OR-NEAR query.
Query	rewrite(SpanRangeQuery q) Rewrite a span range query.
Query	rewrite(SpanWildcardQuery q) Rewrite a span wildcard query.

Methods inherited from class XtfQueryRewriter

rewrite, rewrite, rewrite, rewriteQuery

Methods inherited from class QueryRewriter

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

Methods inherited from class Object

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

Field Detail

docNumMap

private DocNumMap docNumMap

stopSet

private Set stopSet

pluralMap

private WordMap pluralMap

accentMap

private CharMap accentMap

Constructor Detail

SlopFixupRewriter

public SlopFixupRewriter(DocNumMap docNumMap,
                         Set stopSet,
                         WordMap pluralMap,
                         CharMap accentMap)

Construct a new rewriter

Method Detail

forceRewrite

public boolean forceRewrite(Query q)

Description copied from class: QueryRewriter

Can be used to force some or all queries to be rewritten even if no changes. This is useful for copying queries, or easily making changes to them. The base class always returns false; derived classes should override this method if they want copying behavior.

Overrides:

forceRewrite in class QueryRewriter

rewrite

public Query rewrite(SpanNearQuery nq)

Description copied from class: QueryRewriter

Rewrite a span NEAR query.

Overrides:

rewrite in class QueryRewriter

Parameters:

nq - The query to rewrite

Returns:

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

rewrite

public Query rewrite(SpanOrNearQuery nq)

Description copied from class: QueryRewriter

Rewrite a span OR-NEAR query.

Overrides:

rewrite in class QueryRewriter

Parameters:

nq - The query to rewrite

Returns:

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

rewrite

public Query rewrite(SpanChunkedNotQuery nq)

Description copied from class: QueryRewriter

Rewrite a span-based NOT query. The procedure in this case is simple: simply rewrite both the include and exclude clauses.

Overrides:

rewrite in class QueryRewriter

Parameters:

nq - The query to rewrite

Returns:

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

rewrite

public Query rewrite(SpanDechunkingQuery q)

Description copied from class: QueryRewriter

Rewrite a span dechunking query. If's very simple: simply rewrite the clause the query wraps.

Overrides:

rewrite in class QueryRewriter

Parameters:

q - The query to rewrite

Returns:

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

rewrite

public Query rewrite(SpanWildcardQuery q)

Description copied from class: QueryRewriter

Rewrite a span wildcard query. The base class does nothing unless rewriting is forced.

Overrides:

rewrite in class QueryRewriter

Parameters:

q - The query to rewrite

Returns:

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

rewrite

public Query rewrite(SpanRangeQuery q)

Description copied from class: QueryRewriter

Rewrite a span range query. The base class does nothing unless rewriting is forced.

Overrides:

rewrite in class QueryRewriter

Parameters:

q - The query to rewrite

Returns:

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

rewrite

public Query rewrite(MoreLikeThisQuery q)

Description copied from class: XtfQueryRewriter

Rewrite a "more like this" query

Overrides:

rewrite in class XtfQueryRewriter