Package org.apache.solr.handler.component

Class ExpandComponent

java.lang.Object

org.apache.solr.handler.component.SearchComponent

org.apache.solr.handler.component.ExpandComponent

All Implemented Interfaces:

AutoCloseable, SolrInfoBean, SolrMetricProducer, NamedListInitializedPlugin, PluginInfoInitialized

public class ExpandComponent
extends SearchComponent
implements PluginInfoInitialized

The ExpandComponent is designed to work with the CollapsingPostFilter. The CollapsingPostFilter collapses a result set on a field.

The ExpandComponent expands the collapsed groups for a single page. When multiple collapse groups are specified then, the field is chosen from collapse group with min cost. If the cost are equal then, the field is chosen from first collapse group.

http parameters:

expand=true
expand.rows=5
expand.sort=field asc|desc
expand.q=*:* (optional, overrides the main query)
expand.fq=type:child (optional, overrides the main filter queries)
expand.field=field (mandatory, if the not used with the CollapsingQParserPlugin. This is given higher priority when both are present)

Nested Class Summary

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

SolrInfoBean.Category, SolrInfoBean.Group

Field Summary

Fields

Modifier and Type	Field	Description
static final String	COMPONENT_NAME

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

solrMetricsContext, standard_components

Fields inherited from interface org.apache.solr.metrics.SolrMetricProducer

CATEGORY_ATTR, HANDLER_ATTR, NAME_ATTR, OPERATION_ATTR, PLUGIN_NAME_ATTR, RESULT_ATTR, TYPE_ATTR

Constructor Summary

Constructors

Constructor	Description
ExpandComponent()

Method Summary

Modifier and Type	Method	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
void	handleResponses(ResponseBuilder rb, ShardRequest sreq)	Called after all responses for a single request were received
void	init(PluginInfo info)
void	modifyRequest(ResponseBuilder rb, SearchComponent who, ShardRequest sreq)	Called after another component adds a request
void	prepare(ResponseBuilder rb)	Prepare the response.
void	process(ResponseBuilder rb)	Process the request for this component

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

getName, getSolrMetricsContext, initializeMetrics, 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.util.plugin.NamedListInitializedPlugin

init

Methods inherited from interface org.apache.solr.metrics.SolrMetricProducer

close

Field Details

COMPONENT_NAME

public static final String COMPONENT_NAME

See Also:

• Constant Field Values

Constructor Details

ExpandComponent

public ExpandComponent()

Method Details

init

public void init(PluginInfo info)

Specified by:

init in interface PluginInfoInitialized

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.

process

public void process(ResponseBuilder rb)
             throws IOException

Description copied from class: SearchComponent

Process the request for this component

Specified by:

process in class SearchComponent

Parameters:

rb - The ResponseBuilder

Throws:

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

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