org.apache.solr.handler.component

Class FacetComponent

java.lang.Object

org.apache.solr.handler.component.SearchComponent

org.apache.solr.handler.component.FacetComponent

All Implemented Interfaces:

SolrInfoBean, NamedListInitializedPlugin

public class FacetComponent
extends SearchComponent

Computes facets -- aggregations with counts of terms or ranges over the whole search results.

Since:

solr 1.3

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	FacetComponent.DistribFieldFacet This API is experimental and subject to change
static class	FacetComponent.FacetBase This API is experimental and subject to change
static class	FacetComponent.FacetContext Encapsulates facet ranges and facet queries such that their parameters are parsed and cached for efficient re-use.
static class	FacetComponent.FacetInfo This class is used exclusively for merging results from each shard in a distributed facet request.
static class	FacetComponent.FieldFacet This API is experimental and subject to change
static class	FacetComponent.QueryFacet This API is experimental and subject to change
static class	FacetComponent.ShardFacetCount This API is experimental and subject to change

Nested classes/interfaces inherited from interface org.apache.solr.core.SolrInfoBean

SolrInfoBean.Category, SolrInfoBean.Group

Field Summary

Fields

Modifier and Type	Field and Description
static String	COMPONENT_NAME
static String	FACET_FIELD_KEY
static String	FACET_INTERVALS_KEY
static String	FACET_QUERY_KEY
static String	FACET_RANGES_KEY
static String[]	FACET_TYPE_PARAMS

Fields inherited from class org.apache.solr.handler.component.SearchComponent

metricNames, registry, standard_components

Constructor Summary

Constructors

Constructor and Description
FacetComponent()

Method Summary

Modifier and Type	Method and Description
int	distributedProcess(ResponseBuilder rb) Process for a distributed search.
void	finishStage(ResponseBuilder rb) Called after all responses have been received for this stage.
SolrInfoBean.Category	getCategory() Category of this component
String	getDescription() Simple one or two line description
static NamedList<Object>	getFacetCounts(SimpleFacets simpleFacets)
static NamedList<Object>	getFacetCounts(SimpleFacets simpleFacets, FacetDebugInfo fdebug) Looks at various Params to determining if any simple Facet Constraint count computations are desired.
void	handleResponses(ResponseBuilder rb, ShardRequest sreq) Called after all responses for a single request were received
void	modifyRequest(ResponseBuilder rb, SearchComponent who, ShardRequest sreq) Called after another component adds a request
protected SimpleFacets	newSimpleFacets(SolrQueryRequest req, DocSet docSet, SolrParams params, ResponseBuilder rb)
void	prepare(ResponseBuilder rb) Prepare the response.
void	process(ResponseBuilder rb) Actually run the query

Methods inherited from class org.apache.solr.handler.component.SearchComponent

getMetricNames, getMetricRegistry, getName, init, setName

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.solr.core.SolrInfoBean

getMetricsSnapshot, registerMetricName

Field Detail

COMPONENT_NAME

public static final String COMPONENT_NAME

See Also:

Constant Field Values

FACET_QUERY_KEY

public static final String FACET_QUERY_KEY

See Also:

Constant Field Values

FACET_FIELD_KEY

public static final String FACET_FIELD_KEY

See Also:

Constant Field Values

FACET_RANGES_KEY

public static final String FACET_RANGES_KEY

See Also:

Constant Field Values

FACET_INTERVALS_KEY

public static final String FACET_INTERVALS_KEY

See Also:

Constant Field Values

FACET_TYPE_PARAMS

public static String[] FACET_TYPE_PARAMS

Constructor Detail

FacetComponent

public FacetComponent()

Method Detail

prepare

public void prepare(ResponseBuilder rb)
             throws IOException

Description copied from class: SearchComponent

Prepare the response. Guaranteed to be called before any SearchComponent SearchComponent.process(org.apache.solr.handler.component.ResponseBuilder) method. Called for every incoming request. The place to do initialization that is request dependent.

Specified by:

prepare in class SearchComponent

Parameters:

rb - The ResponseBuilder

Throws:

IOException - If there is a low-level I/O error.

newSimpleFacets

protected SimpleFacets newSimpleFacets(SolrQueryRequest req,
                                       DocSet docSet,
                                       SolrParams params,
                                       ResponseBuilder rb)

process

public void process(ResponseBuilder rb)
             throws IOException

Actually run the query

Specified by:

process in class SearchComponent

Parameters:

rb - The ResponseBuilder

Throws:

IOException - If there is a low-level I/O error.

getFacetCounts

public static NamedList<Object> getFacetCounts(SimpleFacets simpleFacets)

getFacetCounts

public static NamedList<Object> getFacetCounts(SimpleFacets simpleFacets,
                                               FacetDebugInfo fdebug)

Looks at various Params to determining if any simple Facet Constraint count computations are desired.

Returns:

a NamedList of Facet Count info or null

See Also:

SimpleFacets.getFacetQueryCounts(), SimpleFacets.getFacetFieldCounts(), RangeFacetProcessor.getFacetRangeCounts(), SimpleFacets.getFacetIntervalCounts(), FacetParams.FACET

distributedProcess

public int distributedProcess(ResponseBuilder rb)
                       throws IOException

Description copied from class: SearchComponent

Process for a distributed search.

Overrides:

distributedProcess in class SearchComponent

Returns:

the next stage for this component

Throws:

IOException

modifyRequest

public void modifyRequest(ResponseBuilder rb,
                          SearchComponent who,
                          ShardRequest sreq)

Description copied from class: SearchComponent

Called after another component adds a request

Overrides:

modifyRequest in class SearchComponent

handleResponses

public void handleResponses(ResponseBuilder rb,
                            ShardRequest sreq)

Description copied from class: SearchComponent

Called after all responses for a single request were received

Overrides:

handleResponses in class SearchComponent

finishStage

public void finishStage(ResponseBuilder rb)

Description copied from class: SearchComponent

Called after all responses have been received for this stage. Useful when different requests are sent to each shard.

Overrides:

finishStage in class SearchComponent

getDescription

public String getDescription()

Description copied from interface: SolrInfoBean

Simple one or two line description

Specified by:

getDescription in interface SolrInfoBean

Specified by:

getDescription in class SearchComponent

getCategory

public SolrInfoBean.Category getCategory()

Description copied from interface: SolrInfoBean

Category of this component

Specified by:

getCategory in interface SolrInfoBean

Overrides:

getCategory in class SearchComponent