Package org.eclipse.rdf4j.sail.lucene.impl

Class LuceneIndex

java.lang.Object

org.eclipse.rdf4j.sail.lucene.AbstractSearchIndex

org.eclipse.rdf4j.sail.lucene.AbstractLuceneIndex

org.eclipse.rdf4j.sail.lucene.impl.LuceneIndex

All Implemented Interfaces:

SearchIndex

Direct Known Subclasses:

LuceneIndexNIOFS

public class LuceneIndex
extends AbstractLuceneIndex

A LuceneIndex is a one-stop-shop abstraction of a Lucene index. It takes care of proper synchronization of IndexReaders, IndexWriters and IndexSearchers in a way that is suitable for a LuceneSail.

See Also:

• LuceneSail

Field Summary

Fields

Modifier and Type	Field	Description
protected ReaderMonitor	currentMonitor	This holds IndexReader and IndexSearcher.

Fields inherited from class org.eclipse.rdf4j.sail.lucene.AbstractLuceneIndex

oldmonitors

Fields inherited from class org.eclipse.rdf4j.sail.lucene.AbstractSearchIndex

maxDocs, wktFields

Constructor Summary

Constructors

Constructor	Description
LuceneIndex()
LuceneIndex(org.apache.lucene.store.Directory directory, org.apache.lucene.analysis.Analyzer analyzer)	Constructor for keeping backwards compatibility.
LuceneIndex(org.apache.lucene.store.Directory directory, org.apache.lucene.analysis.Analyzer analyzer, org.apache.lucene.search.similarities.Similarity similarity)	Creates a new LuceneIndex.

Method Summary

Modifier and Type	Method	Description
static void	addContextField(String context, org.apache.lucene.document.Document document)	Add the "context" value to the doc
protected void	addDocument(SearchDocument doc)
static void	addIDField(String id, org.apache.lucene.document.Document document)	Stores and indexes an ID in a Document.
static void	addPredicateField(String predicate, String text, org.apache.lucene.document.Document document)
static void	addResourceField(String resourceId, org.apache.lucene.document.Document document)	Stores and indexes the resource ID in a Document.
static void	addStoredOnlyPredicateField(String predicate, String text, org.apache.lucene.document.Document document)
static void	addTextField(String text, org.apache.lucene.document.Document document)
void	begin()	Begins a transaction.
void	clear()	Clears the indexes.
void	clearContexts(Resource... contexts)	This should be called from within a begin-commit-rollback block.
void	commit()	Commits any changes done to the LuceneIndex since the last commit.
protected SearchDocument	copyDocument(SearchDocument doc)
protected org.apache.lucene.analysis.Analyzer	createAnalyzer(Properties parameters)
protected org.apache.lucene.store.Directory	createDirectory(Properties parameters)
protected org.apache.lucene.analysis.Analyzer	createQueryAnalyzer(Properties parameters)
protected org.apache.lucene.search.similarities.Similarity	createSimilarity(Properties parameters)
protected com.google.common.base.Function<String,? extends org.apache.lucene.spatial.SpatialStrategy>	createSpatialStrategyMapper(Map<String,String> parameters)
protected void	deleteDocument(SearchDocument doc)
protected Iterable<? extends DocumentDistance>	geoQuery(IRI geoProperty, org.locationtech.spatial4j.shape.Point p, IRI units, double distance, String distanceVar, Var contextVar)
protected Iterable<? extends DocumentResult>	geoRelationQuery(String relation, IRI geoProperty, String wkt, Var contextVar)
org.apache.lucene.analysis.Analyzer	getAnalyzer()
ReaderMonitor	getCurrentMonitor()	Current monitor holds instance of IndexReader and IndexSearcher It is used to keep track of readers
org.apache.lucene.store.Directory	getDirectory()
org.apache.lucene.document.Document	getDocument(int docId, Set<String> fieldsToLoad)	Returns the lucene hit with the given id of the respective lucene query
protected SearchDocument	getDocument(String id)
org.apache.lucene.document.Document	getDocument(Resource subject, Resource context)	Returns a Document representing the specified Resource and Context combination, or null when no such Document exists yet.
protected Iterable<? extends SearchDocument>	getDocuments(String resourceId)
List<org.apache.lucene.document.Document>	getDocuments(Resource subject)	Returns a list of Documents representing the specified Resource (empty when no such Document exists yet).Each document represent a set of statements with the specified Resource as a subject, which are stored in a specific context
org.apache.lucene.index.IndexReader	getIndexReader()
org.apache.lucene.search.IndexSearcher	getIndexSearcher()
org.apache.lucene.index.IndexWriter	getIndexWriter()
String	getSnippet(String fieldName, String text, org.apache.lucene.search.highlight.Highlighter highlighter)
protected org.locationtech.spatial4j.context.SpatialContext	getSpatialContext(String property)
com.google.common.base.Function<? super String,? extends org.apache.lucene.spatial.SpatialStrategy>	getSpatialStrategyMapper()
void	initialize(Properties parameters)
protected BulkUpdater	newBulkUpdate()
protected SearchDocument	newDocument(String id, String resourceId, String context)
protected Iterable<? extends DocumentScore>	query(Resource subject, QuerySpec spec)	Parse the passed query.
void	rollback()
org.apache.lucene.search.TopDocs	search(org.apache.lucene.search.Query query)	Evaluates the given query and returns the results as a TopDocs instance.
org.apache.lucene.search.TopDocs	search(Resource resource, org.apache.lucene.search.Query query)	Evaluates the given query only for the given resource.
void	shutDown()
protected void	updateDocument(SearchDocument doc)

Methods inherited from class org.eclipse.rdf4j.sail.lucene.AbstractLuceneIndex

getOldMonitors

Methods inherited from class org.eclipse.rdf4j.sail.lucene.AbstractSearchIndex

accept, addDocuments, addRemoveStatements, addStatement, evaluate, getIndexedTypeMapping, getResource, isGeoField, isIndexedTypeStatement, isTypeFilteringEnabled, isTypeStatement, parseLuceneQueryShape, parseQueryPoint, parseQueryShape, removeStatement

Methods inherited from class java.lang.Object

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

Field Details

currentMonitor

protected volatile ReaderMonitor currentMonitor

This holds IndexReader and IndexSearcher.

Constructor Details

LuceneIndex

public LuceneIndex()

LuceneIndex

public LuceneIndex(org.apache.lucene.store.Directory directory,
 org.apache.lucene.analysis.Analyzer analyzer)
            throws IOException

Constructor for keeping backwards compatibility.

Parameters:

directory -

analyzer -

Throws:

IOException

LuceneIndex

public LuceneIndex(org.apache.lucene.store.Directory directory,
 org.apache.lucene.analysis.Analyzer analyzer,
 org.apache.lucene.search.similarities.Similarity similarity)
            throws IOException

Creates a new LuceneIndex.

Parameters:

directory - The Directory in which an index can be found and/or in which index files are written.

analyzer - The Analyzer that will be used for tokenizing strings to index and queries.

similarity - The Similarity that will be used for scoring.

Throws:

IOException - When the Directory could not be unlocked.

Method Details

initialize

public void initialize(Properties parameters)
                throws Exception

Specified by:

initialize in interface SearchIndex

Overrides:

initialize in class AbstractSearchIndex

Throws:

Exception

createDirectory

protected org.apache.lucene.store.Directory createDirectory(Properties parameters)
                                                     throws IOException

Throws:

IOException

createAnalyzer

protected org.apache.lucene.analysis.Analyzer createAnalyzer(Properties parameters)
                                                      throws Exception

Throws:

Exception

createQueryAnalyzer

protected org.apache.lucene.analysis.Analyzer createQueryAnalyzer(Properties parameters)
                                                           throws Exception

Throws:

Exception

createSimilarity

protected org.apache.lucene.search.similarities.Similarity createSimilarity(Properties parameters)
                                                                     throws Exception

Throws:

Exception

createSpatialStrategyMapper

protected com.google.common.base.Function<String,? extends org.apache.lucene.spatial.SpatialStrategy> createSpatialStrategyMapper(Map<String,String> parameters)

getSpatialContext

protected org.locationtech.spatial4j.context.SpatialContext getSpatialContext(String property)

Specified by:

getSpatialContext in class AbstractSearchIndex

getDirectory

public org.apache.lucene.store.Directory getDirectory()

getAnalyzer

public org.apache.lucene.analysis.Analyzer getAnalyzer()

getSpatialStrategyMapper

public com.google.common.base.Function<? super String,? extends org.apache.lucene.spatial.SpatialStrategy> getSpatialStrategyMapper()

getIndexReader

public org.apache.lucene.index.IndexReader getIndexReader()
                                                   throws IOException

Throws:

IOException

getIndexSearcher

public org.apache.lucene.search.IndexSearcher getIndexSearcher()
                                                        throws IOException

Throws:

IOException

getCurrentMonitor

public ReaderMonitor getCurrentMonitor()

Current monitor holds instance of IndexReader and IndexSearcher It is used to keep track of readers

Specified by:

getCurrentMonitor in class AbstractLuceneIndex

getIndexWriter

public org.apache.lucene.index.IndexWriter getIndexWriter()
                                                   throws IOException

Throws:

IOException

shutDown

public void shutDown()
              throws IOException

Throws:

IOException

getDocument

protected SearchDocument getDocument(String id)
                              throws IOException

Specified by:

getDocument in class AbstractSearchIndex

Throws:

IOException

getDocuments

protected Iterable<? extends SearchDocument> getDocuments(String resourceId)
                                                   throws IOException

Specified by:

getDocuments in class AbstractSearchIndex

Throws:

IOException

newDocument

protected SearchDocument newDocument(String id,
 String resourceId,
 String context)

Specified by:

newDocument in class AbstractSearchIndex

copyDocument

protected SearchDocument copyDocument(SearchDocument doc)

Specified by:

copyDocument in class AbstractSearchIndex

addDocument

protected void addDocument(SearchDocument doc)
                    throws IOException

Specified by:

addDocument in class AbstractSearchIndex

Throws:

IOException

updateDocument

protected void updateDocument(SearchDocument doc)
                       throws IOException

Specified by:

updateDocument in class AbstractSearchIndex

Throws:

IOException

deleteDocument

protected void deleteDocument(SearchDocument doc)
                       throws IOException

Specified by:

deleteDocument in class AbstractSearchIndex

Throws:

IOException

newBulkUpdate

protected BulkUpdater newBulkUpdate()

Specified by:

newBulkUpdate in class AbstractSearchIndex

getDocument

public org.apache.lucene.document.Document getDocument(Resource subject,
 Resource context)
                                                throws IOException

Returns a Document representing the specified Resource and Context combination, or null when no such Document exists yet.

Parameters:

subject -

context -

Returns:

document

Throws:

IOException

getDocuments

public List<org.apache.lucene.document.Document> getDocuments(Resource subject)
                                                       throws IOException

Returns a list of Documents representing the specified Resource (empty when no such Document exists yet).Each document represent a set of statements with the specified Resource as a subject, which are stored in a specific context

Parameters:

subject -

Returns:

list of documents

Throws:

IOException

addIDField

public static void addIDField(String id,
 org.apache.lucene.document.Document document)

Stores and indexes an ID in a Document.

Parameters:

id -

document -

addContextField

public static void addContextField(String context,
 org.apache.lucene.document.Document document)

Add the "context" value to the doc

Parameters:

context - the context or null, if null-context

document - the document

addResourceField

public static void addResourceField(String resourceId,
 org.apache.lucene.document.Document document)

Stores and indexes the resource ID in a Document.

Parameters:

resourceId -

document -

addPredicateField

public static void addPredicateField(String predicate,
 String text,
 org.apache.lucene.document.Document document)

addStoredOnlyPredicateField

public static void addStoredOnlyPredicateField(String predicate,
 String text,
 org.apache.lucene.document.Document document)

addTextField

public static void addTextField(String text,
 org.apache.lucene.document.Document document)

begin

public void begin()
           throws IOException

Description copied from interface: SearchIndex

Begins a transaction.

Throws:

IOException

commit

public void commit()
            throws IOException

Commits any changes done to the LuceneIndex since the last commit. The semantics is synchronous to SailConnection.commit(), i.e. the LuceneIndex should be committed/rolled back whenever the LuceneSailConnection is committed/rolled back.

Throws:

IOException

rollback

public void rollback()
              throws IOException

Throws:

IOException

query

protected Iterable<? extends DocumentScore> query(Resource subject,
 QuerySpec spec)
                                           throws MalformedQueryException,
IOException

Parse the passed query.

Specified by:

query in class AbstractSearchIndex

Parameters:

subject - subject

spec - spec

Returns:

the parsed query

Throws:

MalformedQueryException - when the parsing breaks

IOException

geoQuery

protected Iterable<? extends DocumentDistance> geoQuery(IRI geoProperty,
 org.locationtech.spatial4j.shape.Point p,
 IRI units,
 double distance,
 String distanceVar,
 Var contextVar)
                                                 throws MalformedQueryException,
IOException

Specified by:

geoQuery in class AbstractSearchIndex

Throws:

MalformedQueryException

IOException

geoRelationQuery

protected Iterable<? extends DocumentResult> geoRelationQuery(String relation,
 IRI geoProperty,
 String wkt,
 Var contextVar)
                                                       throws MalformedQueryException,
IOException

Specified by:

geoRelationQuery in class AbstractSearchIndex

Throws:

MalformedQueryException

IOException

getDocument

public org.apache.lucene.document.Document getDocument(int docId,
 Set<String> fieldsToLoad)

Returns the lucene hit with the given id of the respective lucene query

Parameters:

docId - the id of the document to return

fieldsToLoad -

Returns:

the requested hit, or null if it fails

getSnippet

public String getSnippet(String fieldName,
 String text,
 org.apache.lucene.search.highlight.Highlighter highlighter)

search

public org.apache.lucene.search.TopDocs search(Resource resource,
 org.apache.lucene.search.Query query)
                                        throws IOException

Evaluates the given query only for the given resource.

Parameters:

resource -

query -

Returns:

top documents

Throws:

IOException

search

public org.apache.lucene.search.TopDocs search(org.apache.lucene.search.Query query)
                                        throws IOException

Evaluates the given query and returns the results as a TopDocs instance.

Parameters:

query -

Returns:

top documents

Throws:

IOException

clearContexts

public void clearContexts(Resource... contexts)
                   throws IOException

Description copied from interface: SearchIndex

This should be called from within a begin-commit-rollback block.

Parameters:

contexts -

Throws:

IOException

clear

public void clear()
           throws IOException

Description copied from interface: SearchIndex

Clears the indexes.

Throws:

IOException