org.apache.nutch.searcher.basic
Class BasicQueryFilter

java.lang.Object
  org.apache.nutch.searcher.basic.BasicQueryFilter

All Implemented Interfaces:

Configurable, Pluggable, QueryFilter

public class BasicQueryFilter
extends Object
implements QueryFilter

The default query filter. Query terms in the default query field are expanded to search the url, anchor and content document fields. Additional fields can be added by specifying parameters of the form : query.basic.(fieldname).boost to the configuration files (see nutch-default.xml for an example).Such fields will be used in the clauses generated by the BasicQueryFilter e.g. for a user query A B, it generates +(field1:A field2:A ...) +(field1:B field2:B....). If you don't want the additional fields to be included in the clauses you will need to implement a custom query filter for it.

Field Summary

Fields inherited from interface org.apache.nutch.searcher.QueryFilter

X_POINT_ID

Constructor Summary

BasicQueryFilter()

Method Summary

BooleanQuery	filter(Query input, BooleanQuery output) Adds clauses or otherwise modifies the BooleanQuery that will be searched.
Configuration	getConf()
void	setAnchorBoost(float boost) Set the boost factor for title/anchor matches, relative to url and content matches.
void	setConf(Configuration conf)
void	setPhraseBoost(float boost) Set the boost factor for sloppy phrase matches relative to unordered term matches.
void	setSlop(int slop) Set the maximum number of terms permitted between matching terms in a sloppy phrase match.
void	setUrlBoost(float boost) Set the boost factor for url matches, relative to content and anchor matches

Methods inherited from class java.lang.Object

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

Constructor Detail

BasicQueryFilter

public BasicQueryFilter()

Method Detail

setUrlBoost

public void setUrlBoost(float boost)

Set the boost factor for url matches, relative to content and anchor matches

setAnchorBoost

public void setAnchorBoost(float boost)

Set the boost factor for title/anchor matches, relative to url and content matches.

setPhraseBoost

public void setPhraseBoost(float boost)

Set the boost factor for sloppy phrase matches relative to unordered term matches.

setSlop

public void setSlop(int slop)

Set the maximum number of terms permitted between matching terms in a sloppy phrase match.

filter

public BooleanQuery filter(Query input,
                           BooleanQuery output)

Description copied from interface: QueryFilter

Adds clauses or otherwise modifies the BooleanQuery that will be searched.

Specified by:

filter in interface QueryFilter

setConf

public void setConf(Configuration conf)

Specified by:

setConf in interface Configurable

getConf

public Configuration getConf()

Specified by:

getConf in interface Configurable