Package org.apache.solr.highlight

Class RegexFragmenter

java.lang.Object

org.apache.solr.highlight.HighlightingPluginBase

org.apache.solr.highlight.RegexFragmenter

All Implemented Interfaces:

AutoCloseable, SolrInfoBean, SolrFragmenter, SolrMetricProducer, NamedListInitializedPlugin

public class RegexFragmenter
extends HighlightingPluginBase
implements SolrFragmenter

Fragmenter that tries to produce snippets that "look" like a regular expression. solrconfig.xml parameters:

• hl.regex.pattern: regular expression corresponding to "nice" fragments.
• hl.regex.slop: how far the fragmenter can stray from the ideal fragment size. A slop of 0.2 means that the fragmenter can go over or under by 20%.
• hl.regex.maxAnalyzedChars: how many characters to apply the regular expression to (independent from the global highlighter setting).

NOTE: the default for maxAnalyzedChars is much lower for this fragmenter. After this limit is exhausted, fragments are produced in the same way as GapFragmenter

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
protected Pattern	defaultPattern
protected String	defaultPatternRaw

Fields inherited from class org.apache.solr.highlight.HighlightingPluginBase

defaults, metricNames, numRequests, solrMetricsContext

Constructor Summary

Constructors

Constructor	Description
RegexFragmenter()

Method Summary

Modifier and Type	Method	Description
String	getDescription()	Simple one or two line description
org.apache.lucene.search.highlight.Fragmenter	getFragmenter(String fieldName, SolrParams params)	Return a Fragmenter appropriate for this field.
void	init(NamedList<?> args)	init will be called just once, immediately after creation.

Methods inherited from class org.apache.solr.highlight.HighlightingPluginBase

getCategory, getName, getSolrMetricsContext, initializeMetrics

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

getCategory, getName

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

close, getSolrMetricsContext, initializeMetrics

Field Detail

defaultPatternRaw

protected String defaultPatternRaw

defaultPattern

protected Pattern defaultPattern

Constructor Detail

RegexFragmenter

public RegexFragmenter()

Method Detail

init

public void init(NamedList<?> args)

Description copied from interface: NamedListInitializedPlugin

init will be called just once, immediately after creation.

Source of the initialization arguments will typically be solrconfig.xml, but will ultimately depends on the plugin itself

Specified by:

init in interface NamedListInitializedPlugin

Overrides:

init in class HighlightingPluginBase

Parameters:

args - non-null list of initialization parameters (may be empty)

getFragmenter

public org.apache.lucene.search.highlight.Fragmenter getFragmenter(String fieldName,
                                                                   SolrParams params)

Description copied from interface: SolrFragmenter

Return a Fragmenter appropriate for this field.

Specified by:

getFragmenter in interface SolrFragmenter

Parameters:

fieldName - The name of the field

params - The params controlling Highlighting

Returns:

An appropriate Fragmenter.

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 HighlightingPluginBase