org.apache.solr.highlight

Class DefaultSolrHighlighter

java.lang.Object

org.apache.solr.highlight.SolrHighlighter

org.apache.solr.highlight.DefaultSolrHighlighter

All Implemented Interfaces:

PluginInfoInitialized

public class DefaultSolrHighlighter
extends SolrHighlighter
implements PluginInfoInitialized

Since:

solr 1.3

Field Summary

Fields

Modifier and Type	Field and Description
protected Map<String,SolrBoundaryScanner>	boundaryScanners
protected Map<String,SolrEncoder>	encoders
protected Map<String,SolrFormatter>	formatters
protected Map<String,SolrFragListBuilder>	fragListBuilders
protected Map<String,SolrFragmenter>	fragmenters
protected Map<String,SolrFragmentsBuilder>	fragmentsBuilders
static org.slf4j.Logger	log
protected SolrCore	solrCore

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

DEFAULT_PHRASE_LIMIT

Constructor Summary

Constructors

Constructor and Description
DefaultSolrHighlighter(SolrCore solrCore)

Method Summary

Methods

Modifier and Type	Method and Description
protected Object	alternateField(Document doc, String fieldName, SolrQueryRequest req) Returns the alternate highlight object for this field -- a String[] by default.
protected TokenStream	createAnalyzerTStream(SchemaField schemaField, String docText)
NamedList<Object>	doHighlighting(DocList docs, Query query, SolrQueryRequest req, String[] defaultFields) Generates a list of Highlighted query fragments for each item in a list of documents, or returns null if highlighting is disabled.
protected Object	doHighlightingByFastVectorHighlighter(Document doc, int docId, SchemaField schemaField, FastVectorHighlighter highlighter, FieldQuery fieldQuery, IndexReader reader, SolrQueryRequest req) Highlights and returns the highlight object for this field -- a String[] by default.
protected Object	doHighlightingByHighlighter(Document doc, int docId, SchemaField schemaField, Query query, IndexReader reader, SolrQueryRequest req) Highlights and returns the highlight object for this field -- a String[] by default.
protected BoundaryScanner	getBoundaryScanner(String fieldName, SolrParams params)
protected Set<String>	getDocPrefetchFieldNames(String[] hlFieldNames, SolrQueryRequest req) Returns the field names to be passed to SolrIndexSearcher.doc(int, Set).
protected Encoder	getEncoder(String fieldName, SolrParams params) Return an Encoder appropriate for this field.
protected List<String>	getFieldValues(Document doc, String fieldName, int maxValues, int maxCharsToAnalyze, SolrQueryRequest req) Fetches field values to highlight.
protected Formatter	getFormatter(String fieldName, SolrParams params) Return a Formatter appropriate for this field.
protected FragListBuilder	getFragListBuilder(String fieldName, SolrParams params)
protected Fragmenter	getFragmenter(String fieldName, SolrParams params) Return a Fragmenter appropriate for this field.
protected FragmentsBuilder	getFragmentsBuilder(String fieldName, SolrParams params)
protected Highlighter	getHighlighter(Query query, String fieldName, SolrQueryRequest request) Return a Highlighter appropriate for this field.
protected int	getMaxSnippets(String fieldName, SolrParams params) Return the max number of snippets for this field.
protected Highlighter	getPhraseHighlighter(Query query, String fieldName, SolrQueryRequest request, TokenStream tokenStream) Return a phrase Highlighter appropriate for this field.
protected Scorer	getQueryScorer(Query query, String fieldName, SolrQueryRequest request) Return a Scorer suitable for this Query and field.
protected Object	getResponseForFragments(List<TextFragment> frags, SolrQueryRequest req) Given the fragments, return the result to be put in the field NamedList.
protected SolrFragmentsBuilder	getSolrFragmentsBuilder(String fieldName, SolrParams params)
protected QueryScorer	getSpanQueryScorer(Query query, String fieldName, TokenStream tokenStream, SolrQueryRequest request) Return a QueryScorer suitable for this Query and field.
void	init(PluginInfo info)
protected boolean	isMergeContiguousFragments(String fieldName, SolrParams params) Return whether adjacent fragments should be merged.
protected boolean	useFastVectorHighlighter(SolrParams params, SchemaField schemaField) Determines if we should use the FastVectorHighlighter for this field.

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

emptyArray, getHighlightFields, isHighlightingEnabled

Methods inherited from class java.lang.Object

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

Field Detail

log

public static org.slf4j.Logger log

solrCore

protected final SolrCore solrCore

formatters

protected final Map<String,SolrFormatter> formatters

encoders

protected final Map<String,SolrEncoder> encoders

fragmenters

protected final Map<String,SolrFragmenter> fragmenters

fragListBuilders

protected final Map<String,SolrFragListBuilder> fragListBuilders

fragmentsBuilders

protected final Map<String,SolrFragmentsBuilder> fragmentsBuilders

boundaryScanners

protected final Map<String,SolrBoundaryScanner> boundaryScanners

Constructor Detail

DefaultSolrHighlighter

public DefaultSolrHighlighter(SolrCore solrCore)

Method Detail

init

public void init(PluginInfo info)

Specified by:

init in interface PluginInfoInitialized

getPhraseHighlighter

protected Highlighter getPhraseHighlighter(Query query,
                               String fieldName,
                               SolrQueryRequest request,
                               TokenStream tokenStream)
                                    throws IOException

Return a phrase Highlighter appropriate for this field.

Parameters:

query - The current Query

fieldName - The name of the field

request - The current SolrQueryRequest

tokenStream - document text tokenStream that implements reset() efficiently (e.g. CachingTokenFilter). If it's used, call reset() first.

Throws:

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

getHighlighter

protected Highlighter getHighlighter(Query query,
                         String fieldName,
                         SolrQueryRequest request)

Return a Highlighter appropriate for this field.

Parameters:

query - The current Query

fieldName - The name of the field

request - The current SolrQueryRequest

getSpanQueryScorer

protected QueryScorer getSpanQueryScorer(Query query,
                             String fieldName,
                             TokenStream tokenStream,
                             SolrQueryRequest request)

Return a QueryScorer suitable for this Query and field.

Parameters:

query - The current query

tokenStream - document text tokenStream that implements reset() efficiently (e.g. CachingTokenFilter). If it's used, call reset() first.

fieldName - The name of the field

request - The SolrQueryRequest

getQueryScorer

protected Scorer getQueryScorer(Query query,
                    String fieldName,
                    SolrQueryRequest request)

Return a Scorer suitable for this Query and field.

Parameters:

query - The current query

fieldName - The name of the field

request - The SolrQueryRequest

getMaxSnippets

protected int getMaxSnippets(String fieldName,
                 SolrParams params)

Return the max number of snippets for this field. If this has not been configured for this field, fall back to the configured default or the solr default.

Parameters:

fieldName - The name of the field

params - The params controlling Highlighting

isMergeContiguousFragments

protected boolean isMergeContiguousFragments(String fieldName,
                                 SolrParams params)

Return whether adjacent fragments should be merged.

Parameters:

fieldName - The name of the field

params - The params controlling Highlighting

getFormatter

protected Formatter getFormatter(String fieldName,
                     SolrParams params)

Return a Formatter appropriate for this field. If a formatter has not been configured for this field, fall back to the configured default or the solr default (SimpleHTMLFormatter).

Parameters:

fieldName - The name of the field

params - The params controlling Highlighting

Returns:

An appropriate Formatter.

getEncoder

protected Encoder getEncoder(String fieldName,
                 SolrParams params)

Return an Encoder appropriate for this field. If an encoder has not been configured for this field, fall back to the configured default or the solr default (DefaultEncoder).

Parameters:

fieldName - The name of the field

params - The params controlling Highlighting

Returns:

An appropriate Encoder.

getFragmenter

protected Fragmenter getFragmenter(String fieldName,
                       SolrParams params)

Return a Fragmenter appropriate for this field. If a fragmenter has not been configured for this field, fall back to the configured default or the solr default (GapFragmenter).

Parameters:

fieldName - The name of the field

params - The params controlling Highlighting

Returns:

An appropriate Fragmenter.

getFragListBuilder

protected FragListBuilder getFragListBuilder(String fieldName,
                                 SolrParams params)

getFragmentsBuilder

protected FragmentsBuilder getFragmentsBuilder(String fieldName,
                                   SolrParams params)

getSolrFragmentsBuilder

protected SolrFragmentsBuilder getSolrFragmentsBuilder(String fieldName,
                                           SolrParams params)

getBoundaryScanner

protected BoundaryScanner getBoundaryScanner(String fieldName,
                                 SolrParams params)

doHighlighting

public NamedList<Object> doHighlighting(DocList docs,
                               Query query,
                               SolrQueryRequest req,
                               String[] defaultFields)
                                 throws IOException

Generates a list of Highlighted query fragments for each item in a list of documents, or returns null if highlighting is disabled.

Specified by:

doHighlighting in class SolrHighlighter

Parameters:

docs - query results

query - the query

req - the current request

defaultFields - default list of fields to summarize

Returns:

NamedList containing a NamedList for each document, which in turns contains sets (field, summary) pairs.

Throws:

IOException

getDocPrefetchFieldNames

protected Set<String> getDocPrefetchFieldNames(String[] hlFieldNames,
                                   SolrQueryRequest req)

Returns the field names to be passed to SolrIndexSearcher.doc(int, Set). Subclasses might over-ride to include fields in search-results and other stored field values needed so as to avoid the possibility of extra trips to disk. The uniqueKey will be added after if the result isn't null.

useFastVectorHighlighter

protected boolean useFastVectorHighlighter(SolrParams params,
                               SchemaField schemaField)

Determines if we should use the FastVectorHighlighter for this field.

doHighlightingByFastVectorHighlighter

protected Object doHighlightingByFastVectorHighlighter(Document doc,
                                           int docId,
                                           SchemaField schemaField,
                                           FastVectorHighlighter highlighter,
                                           FieldQuery fieldQuery,
                                           IndexReader reader,
                                           SolrQueryRequest req)
                                                throws IOException

Highlights and returns the highlight object for this field -- a String[] by default. Null if none.

Throws:

IOException

doHighlightingByHighlighter

protected Object doHighlightingByHighlighter(Document doc,
                                 int docId,
                                 SchemaField schemaField,
                                 Query query,
                                 IndexReader reader,
                                 SolrQueryRequest req)
                                      throws IOException

Highlights and returns the highlight object for this field -- a String[] by default. Null if none.

Throws:

IOException

getFieldValues

protected List<String> getFieldValues(Document doc,
                          String fieldName,
                          int maxValues,
                          int maxCharsToAnalyze,
                          SolrQueryRequest req)

Fetches field values to highlight. If the field value should come from an atypical place (or another aliased field name, then a subclass could override to implement that.

getResponseForFragments

protected Object getResponseForFragments(List<TextFragment> frags,
                             SolrQueryRequest req)

Given the fragments, return the result to be put in the field NamedList. This is an extension point to allow adding other metadata like the absolute offsets or scores.

alternateField

protected Object alternateField(Document doc,
                    String fieldName,
                    SolrQueryRequest req)

Returns the alternate highlight object for this field -- a String[] by default. Null if none.

createAnalyzerTStream

protected TokenStream createAnalyzerTStream(SchemaField schemaField,
                                String docText)
                                     throws IOException

Throws:

IOException