Package com.yahoo.prelude.searcher

Class FieldCollapsingSearcher

java.lang.Object

com.yahoo.component.AbstractComponent

com.yahoo.component.chain.ChainedComponent

com.yahoo.processing.Processor

com.yahoo.search.Searcher

com.yahoo.prelude.searcher.FieldCollapsingSearcher

All Implemented Interfaces:

com.yahoo.component.Component, com.yahoo.component.Deconstructable, Comparable<com.yahoo.component.Component>

public class FieldCollapsingSearcher
extends Searcher

A searcher which does parametrized collapsing.

Author:

Steinar Knutsen

Field Summary

Fields inherited from class com.yahoo.component.AbstractComponent

isDeconstructable

Constructor Summary

Constructors

Constructor	Description
FieldCollapsingSearcher()	Create this searcher using default values for all settings
FieldCollapsingSearcher(int collapseSize, double extraFactor, String collapseField)	Creates a collapser
FieldCollapsingSearcher(com.yahoo.container.QrSearchersConfig config)
FieldCollapsingSearcher(String collapseField)	Creates a collapser

Method Summary

Modifier and Type	Method	Description
Result	search(Query query, Execution execution)	First fetch result from the next searcher in the chain.

Methods inherited from class com.yahoo.search.Searcher

ensureFilled, fill, getLogger, process, toString

Methods inherited from class com.yahoo.component.chain.ChainedComponent

getAnnotatedDependencies, getDefaultAnnotatedDependencies, getDependencies, initDependencies

Methods inherited from class com.yahoo.component.AbstractComponent

clone, compareTo, deconstruct, getClassName, getId, getIdString, hasInitializedId, initId, isDeconstructable, setIsDeconstructable

Methods inherited from class java.lang.Object

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

Constructor Detail

FieldCollapsingSearcher

public FieldCollapsingSearcher()

Create this searcher using default values for all settings

FieldCollapsingSearcher

public FieldCollapsingSearcher(String collapseField)

Creates a collapser

Parameters:

collapseField - the default field to collapse on, or null to not collapse as default

FieldCollapsingSearcher

@Inject
public FieldCollapsingSearcher(com.yahoo.container.QrSearchersConfig config)

FieldCollapsingSearcher

public FieldCollapsingSearcher(int collapseSize,
                               double extraFactor,
                               String collapseField)

Creates a collapser

Parameters:

collapseSize - the maximum number of hits to keep per field the default max number of hits in each collapsed group

extraFactor - the percentage by which to scale up the requested number of hits, to allow some hits to be removed without refetching

collapseField - the field to collapse on. This is currently ignored.

Method Detail

search

public Result search(Query query,
                     Execution execution)

First fetch result from the next searcher in the chain. If collapse is active, do collapsing. Otherwise, act as a simple pass through

Specified by:

search in class Searcher

Parameters:

query - the query

Returns:

the result of making this query