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Core of the Object/Lucene mapper, query engine and index management
/*
* Hibernate Search, full-text search for your domain model
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.search.query.engine.impl;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.lucene.document.Document;
import org.apache.lucene.facet.FacetResult;
import org.apache.lucene.facet.FacetsCollector;
import org.apache.lucene.facet.LabelAndValue;
import org.apache.lucene.facet.range.DoubleRange;
import org.apache.lucene.facet.range.DoubleRangeFacetCounts;
import org.apache.lucene.facet.range.LongRange;
import org.apache.lucene.facet.range.LongRangeFacetCounts;
import org.apache.lucene.facet.sortedset.DefaultSortedSetDocValuesReaderState;
import org.apache.lucene.facet.sortedset.SortedSetDocValuesFacetCounts;
import org.apache.lucene.facet.sortedset.SortedSetDocValuesReaderState;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.LeafReader;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.StoredFieldVisitor;
import org.apache.lucene.index.Terms;
import org.apache.lucene.index.TermsEnum;
import org.apache.lucene.search.Collector;
import org.apache.lucene.search.Explanation;
import org.apache.lucene.search.MultiCollector;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.TimeLimitingCollector;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.search.TopDocsCollector;
import org.apache.lucene.search.TopFieldCollector;
import org.apache.lucene.search.TopScoreDocCollector;
import org.apache.lucene.search.TotalHitCountCollector;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.Counter;
import org.hibernate.search.engine.metadata.impl.FacetMetadata;
import org.hibernate.search.exception.SearchException;
import org.hibernate.search.query.dsl.impl.DiscreteFacetRequest;
import org.hibernate.search.query.dsl.impl.FacetRange;
import org.hibernate.search.query.dsl.impl.RangeFacetRequest;
import org.hibernate.search.query.engine.spi.TimeoutManager;
import org.hibernate.search.query.facet.Facet;
import org.hibernate.search.query.facet.FacetSortOrder;
import org.hibernate.search.query.facet.FacetingRequest;
import org.hibernate.search.spatial.Coordinates;
import org.hibernate.search.spatial.impl.DistanceCollector;
import org.hibernate.search.util.impl.ReflectionHelper;
import org.hibernate.search.util.logging.impl.Log;
import org.hibernate.search.util.logging.impl.LoggerFactory;
import java.lang.invoke.MethodHandles;
/**
* A helper class which gives access to the current query and its hits. This class will dynamically
* reload the underlying {@code TopDocs} if required.
*
* @author Hardy Ferentschik
* @author Sanne Grinovero (C) 2011 Red Hat Inc.
*/
public class QueryHits {
private static final Log log = LoggerFactory.make( MethodHandles.lookup() );
private static final int DEFAULT_TOP_DOC_RETRIEVAL_SIZE = 100;
private static final int DEFAULT_FACET_RETRIEVAL_SIZE = 100;
private final LazyQueryState searcher;
private final QueryFilters filters;
private final Sort sort;
/**
* True to collect hits, false to only collect hit count.
*/
private final boolean collectHits;
private final Map facetingRequestsAndMetadata;
private final TimeoutManagerImpl timeoutManager;
private int totalHits;
private TopDocs topDocs;
private Map> facetMap;
private FacetsCollector facetsCollector;
private DistanceCollector distanceCollector = null;
private Coordinates spatialSearchCenter = null;
private String spatialFieldName = null;
public QueryHits(LazyQueryState searcher,
QueryFilters filters,
Sort sort,
boolean collectHits,
TimeoutManagerImpl timeoutManager,
Map facetingRequestsAndMetadata,
Coordinates spatialSearchCenter,
String spatialFieldName)
throws IOException {
this(
searcher,
filters,
sort,
DEFAULT_TOP_DOC_RETRIEVAL_SIZE,
collectHits,
timeoutManager,
facetingRequestsAndMetadata,
spatialSearchCenter,
spatialFieldName
);
}
public QueryHits(LazyQueryState searcher,
QueryFilters filters,
Sort sort,
Integer n,
boolean collectHits,
TimeoutManagerImpl timeoutManager,
Map facetingRequestsAndMetadata,
Coordinates spatialSearchCenter,
String spatialFieldName)
throws IOException {
this.timeoutManager = timeoutManager;
this.searcher = searcher;
this.filters = filters;
this.sort = sort;
this.collectHits = collectHits;
this.facetingRequestsAndMetadata = facetingRequestsAndMetadata;
this.spatialSearchCenter = spatialSearchCenter;
this.spatialFieldName = spatialFieldName;
updateTopDocs( n );
}
public Document doc(int index) throws IOException {
return searcher.doc( docId( index ) );
}
/**
* This document loading strategy doesn't return anything as it's the responsibility
* of the passed StoredFieldVisitor instance to collect the data it needs.
*
* @param index {@link ScoreDoc} index
* @param fieldVisitor accessor to the stored field value in the index
*
* @throws IOException if an error occurs accessing the index
*/
public void visitDocument(int index, StoredFieldVisitor fieldVisitor) throws IOException {
searcher.doc( docId( index ), fieldVisitor );
}
public ScoreDoc scoreDoc(int index) throws IOException {
if ( index >= totalHits ) {
throw new SearchException( "Not a valid ScoreDoc index: " + index );
}
// TODO - Is there a better way to get more TopDocs? Get more or less?
if ( index >= topDocs.scoreDocs.length ) {
updateTopDocs( 2 * index );
}
return topDocs.scoreDocs[index];
}
public int docId(int index) throws IOException {
return scoreDoc( index ).doc;
}
public float score(int index) throws IOException {
return scoreDoc( index ).score;
}
public Double spatialDistance(int index) throws IOException {
if ( spatialSearchCenter == null ) {
return null;
}
return distanceCollector.getDistance( docId( index ) );
}
public Explanation explain(int index) throws IOException {
final Explanation explanation = searcher.explain( filters, docId( index ) );
timeoutManager.isTimedOut();
return explanation;
}
public int getTotalHits() {
return totalHits;
}
public TopDocs getTopDocs() {
return topDocs;
}
public Map> getFacets() {
if ( facetingRequestsAndMetadata == null || facetingRequestsAndMetadata.size() == 0 ) {
return Collections.emptyMap();
}
return facetMap;
}
/**
* @param n the number of {@code TopDoc}s to retrieve. The actual retrieved number of {@code TopDoc}s is n or the
* total number of documents if {@code n > maxDoc}
*
* @throws IOException in case a search exception occurs
*/
private void updateTopDocs(int n) throws IOException {
final int totalMaxDocs = searcher.maxDoc();
final int maxDocs = Math.min( n, totalMaxDocs );
// We cannot collect top docs if 0 document is requested
boolean collectTopDocs = collectHits && maxDocs != 0;
final TopDocsCollector topDocCollector;
final TotalHitCountCollector hitCountCollector;
Collector collector;
if ( collectTopDocs ) {
topDocCollector = createTopDocCollector( maxDocs );
hitCountCollector = null;
collector = topDocCollector;
collector = optionallyEnableFacetingCollector( collector );
collector = optionallyEnableDistanceCollector( collector, maxDocs );
}
else {
topDocCollector = null;
hitCountCollector = new TotalHitCountCollector();
collector = hitCountCollector;
}
collector = decorateWithTimeOutCollector( collector );
boolean timeoutNow = isImmediateTimeout();
if ( !timeoutNow ) {
try {
searcher.search( filters, collector );
}
catch (TimeLimitingCollector.TimeExceededException e) {
//we have reached the time limit and stopped before the end
//TimeoutManager.isTimedOut should be above that limit but set if for safety
timeoutManager.forceTimedOut();
}
}
// update top docs and totalHits
if ( collectTopDocs ) {
this.topDocs = topDocCollector.topDocs();
this.totalHits = topDocs.totalHits;
}
else {
this.topDocs = null;
this.totalHits = hitCountCollector.getTotalHits();
}
/*
* If we need to collect facet data we have to update our instance state.
* Note that collecting facets may make sense even if we didn't collect top docs,
* in particular if facets were pre-defined as is the case with range facets.
* In that case we would just set the count to 0 for each facet.
*/
if ( collectHits && facetingRequestsAndMetadata != null && !facetingRequestsAndMetadata.isEmpty() ) {
updateFacets();
}
timeoutManager.isTimedOut();
}
private void updateFacets() throws IOException {
facetMap = new HashMap<>();
for ( Map.Entry entry : facetingRequestsAndMetadata.entrySet() ) {
FacetingRequest facetRequest = entry.getKey();
FacetMetadata facetMetadata = entry.getValue();
ArrayList facets;
if ( facetRequest instanceof DiscreteFacetRequest ) {
facets = updateStringFacets( (DiscreteFacetRequest) facetRequest, facetMetadata );
}
else {
facets = updateRangeFacets( (RangeFacetRequest) facetRequest, facetMetadata );
}
// sort if necessary
if ( !facetRequest.getSort().equals( FacetSortOrder.RANGE_DEFINITION_ORDER ) ) {
Collections.sort( facets, FacetComparators.get( facetRequest.getSort() ) );
}
// trim to the expected size
int maxNumberOfExpectedFacets = facetRequest.getMaxNumberOfFacets();
if ( maxNumberOfExpectedFacets > 0 && facets.size() > maxNumberOfExpectedFacets ) {
facets = new ArrayList<>( facets.subList( 0, facetRequest.getMaxNumberOfFacets() ) );
}
facetMap.put( facetRequest.getFacetingName(), facets );
}
}
private ArrayList updateRangeFacets(RangeFacetRequest facetRequest, FacetMetadata facetMetadata) throws IOException {
ArrayList facets;
if ( ReflectionHelper.isIntegerType( facetRequest.getFacetValueType() )
|| Date.class.isAssignableFrom( facetRequest.getFacetValueType() ) ) {
FacetResult facetResult = getFacetResultForLongRange( facetRequest );
facets = new ArrayList<>( facetResult.labelValues.length );
for ( LabelAndValue labelAndValue : facetResult.labelValues ) {
if ( !facetRequest.hasZeroCountsIncluded() && (int) labelAndValue.value == 0 ) {
continue;
}
Facet facet = facetRequest.createFacet( facetMetadata, labelAndValue.label, (int) labelAndValue.value );
facets.add( facet );
}
}
else if ( ReflectionHelper.isFloatingPointType( facetRequest.getFacetValueType() ) ) {
FacetResult facetResult = getFacetResultForFloatingPointRange( facetRequest );
facets = new ArrayList<>( facetResult.labelValues.length );
for ( LabelAndValue labelAndValue : facetResult.labelValues ) {
if ( !facetRequest.hasZeroCountsIncluded() && (int) labelAndValue.value == 0 ) {
continue;
}
Facet facet = facetRequest.createFacet( facetMetadata, labelAndValue.label, (int) labelAndValue.value );
facets.add( facet );
}
}
else {
throw log.unsupportedFacetRangeParameter( facetRequest.getFacetValueType().getName() );
}
return facets;
}
private FacetResult getFacetResultForFloatingPointRange(RangeFacetRequest facetRequest) throws IOException {
List> facetRanges = facetRequest.getFacetRangeList();
DoubleRange[] ranges = new DoubleRange[facetRanges.size()];
int i = 0;
for ( FacetRange facetRange : facetRanges ) {
ranges[i] = new DoubleRange(
facetRange.getRangeString(),
facetRange.getMin() == null ? Double.MIN_VALUE : ( (Number) facetRange.getMin() ).doubleValue(),
facetRange.isMinIncluded(),
facetRange.getMax() == null ? Double.MAX_VALUE : ( (Number) facetRange.getMax() ).doubleValue(),
facetRange.isMaxIncluded()
);
i++;
}
DoubleRangeFacetCounts facetCount = new DoubleRangeFacetCounts(
facetRequest.getFieldName(),
// Use an empty collector if we didn't collect facets (empty index for instance)
facetsCollector != null ? facetsCollector : new FacetsCollector(),
ranges
);
return facetCount.getTopChildren(
facetRequest.getMaxNumberOfFacets(),
facetRequest.getFieldName()
);
}
private FacetResult getFacetResultForLongRange(RangeFacetRequest facetRequest)
throws IOException {
List> facetRanges = facetRequest.getFacetRangeList();
LongRange[] ranges = new LongRange[facetRanges.size()];
int i = 0;
for ( FacetRange facetRange : facetRanges ) {
long min;
long max;
if ( ReflectionHelper.isIntegerType( facetRequest.getFacetValueType() ) ) {
min = facetRange.getMin() == null ? Long.MIN_VALUE : ( (Number) facetRange.getMin() ).longValue();
max = facetRange.getMax() == null ? Long.MAX_VALUE : ( (Number) facetRange.getMax() ).longValue();
}
else {
min = facetRange.getMin() == null ? Long.MIN_VALUE : ( (Date) facetRange.getMin() ).getTime();
max = facetRange.getMax() == null ? Long.MAX_VALUE : ( (Date) facetRange.getMax() ).getTime();
}
ranges[i] = new LongRange(
facetRange.getRangeString(),
min,
facetRange.isMinIncluded(),
max,
facetRange.isMaxIncluded()
);
i++;
}
LongRangeFacetCounts facetCount = new LongRangeFacetCounts(
facetRequest.getFieldName(),
// Use an empty collector if we didn't collect facets (empty index for instance)
facetsCollector != null ? facetsCollector : new FacetsCollector(),
ranges
);
return facetCount.getTopChildren(
facetRequest.getMaxNumberOfFacets(),
facetRequest.getFieldName()
);
}
private ArrayList updateStringFacets(DiscreteFacetRequest facetRequest, FacetMetadata facetMetadata) throws IOException {
ArrayList facets = new ArrayList<>();
SortedSetDocValuesReaderState docValuesReaderState;
try {
docValuesReaderState = new DefaultSortedSetDocValuesReaderState( searcher.getIndexReader() );
}
catch (IllegalArgumentException e) {
/*
* Happens in case there are no facets at all stored in the matching documents.
* But we know the target field is correctly configured to generate facets,
* because we managed to retrieve the FacetMetadata.
* So we can safely return an empty list: the matching documents simply do not have
* any value for this field.
*/
return facets;
}
SortedSetDocValuesFacetCounts facetCounts = new SortedSetDocValuesFacetCounts(
docValuesReaderState,
// Use an empty collector if we didn't collect facets (empty index for instance)
facetsCollector != null ? facetsCollector : new FacetsCollector()
);
Set termValues = Collections.emptySet();
if ( facetRequest.hasZeroCountsIncluded() ) {
termValues = findAllTermsForField( facetMetadata.getSourceField().getAbsoluteName(), searcher.getIndexReader() );
}
int maxFacetCount = facetRequest.getMaxNumberOfFacets() < 0 ? DEFAULT_FACET_RETRIEVAL_SIZE : facetRequest.getMaxNumberOfFacets();
final FacetResult facetResult;
try {
// This might return null!
facetResult = facetCounts.getTopChildren( maxFacetCount, facetRequest.getFieldName() );
}
catch (IllegalArgumentException e) {
/*
* Happens in case there are facets stored in the matching documents in general,
* but not for this specific field.
* But we know this field is correctly configured to generate facets,
* because we managed to retrieve the FacetMetadata.
* So we can safely return an empty list: the matching documents simply do not have
* any value for this field.
*/
return facets;
}
if ( facetResult != null ) {
for ( LabelAndValue labelAndValue : facetResult.labelValues ) {
Facet facet = facetRequest.createFacet( facetMetadata, labelAndValue.label, (int) labelAndValue.value );
facets.add( facet );
termValues.remove( labelAndValue.label );
}
}
for ( String termValue : termValues ) {
Facet facet = facetRequest.createFacet( facetMetadata, termValue, 0 );
facets.add( 0, facet );
}
return facets;
}
/**
* Returns a set of all possible indexed values for a given field name.
*
* Per default Lucene's native discrete faceting won't return values where
* the count would be 0 for a given query. To still include these "zero count values"
* we need to go through the index and find all potential values for a field and compare them
* against the values which had a count. This might potentially be expensive, so returning
* zero count values is per default disabled.
*
* @param fieldName the document field name
* @param reader the index reader
* @return a set of all possible indexed values for a given field name
* @throws IOException
*/
private Set findAllTermsForField(String fieldName, IndexReader reader) throws IOException {
Set termValues = new HashSet<>();
for ( LeafReaderContext leaf : reader.leaves() ) {
final LeafReader atomicReader = leaf.reader();
Terms terms = atomicReader.terms( fieldName );
if ( terms == null ) {
continue;
}
final TermsEnum iterator = terms.iterator();
BytesRef byteRef;
while ( ( byteRef = iterator.next() ) != null ) {
termValues.add( byteRef.utf8ToString() );
}
}
return termValues;
}
private Collector optionallyEnableFacetingCollector(Collector collector) {
if ( facetingRequestsAndMetadata == null || facetingRequestsAndMetadata.isEmpty() ) {
return collector;
}
facetsCollector = new FacetsCollector();
return MultiCollector.wrap( facetsCollector, collector );
}
private Collector optionallyEnableDistanceCollector(Collector collector, int maxDocs) {
if ( spatialFieldName == null || spatialFieldName.isEmpty() || spatialSearchCenter == null ) {
return collector;
}
distanceCollector = new DistanceCollector( spatialSearchCenter, maxDocs, spatialFieldName );
return MultiCollector.wrap( distanceCollector, collector );
}
private boolean isImmediateTimeout() {
boolean timeoutAt0 = false;
if ( timeoutManager.getType() == TimeoutManager.Type.LIMIT ) {
final Long timeoutLeft = timeoutManager.getTimeoutLeftInMilliseconds();
if ( timeoutLeft != null ) {
if ( timeoutLeft == 0l ) {
if ( timeoutManager.isTimedOut() ) {
timeoutManager.forceTimedOut();
timeoutAt0 = true;
}
}
}
else {
if ( timeoutManager.isTimedOut() ) {
timeoutManager.forceTimedOut();
}
}
}
return timeoutAt0;
}
private Collector decorateWithTimeOutCollector(Collector collector) {
Collector maybeTimeLimitingCollector = collector;
if ( timeoutManager.getType() == TimeoutManager.Type.LIMIT ) {
final Long timeoutLeft = timeoutManager.getTimeoutLeftInMilliseconds();
if ( timeoutLeft != null ) {
Counter counter = timeoutManager.getLuceneTimeoutCounter();
maybeTimeLimitingCollector = new TimeLimitingCollector( collector, counter, timeoutLeft );
}
}
return maybeTimeLimitingCollector;
}
private TopDocsCollector createTopDocCollector(int maxDocs) throws IOException {
TopDocsCollector topCollector;
if ( sort == null ) {
topCollector = TopScoreDocCollector.create( maxDocs );
}
else {
boolean fillFields = true;
topCollector = TopFieldCollector.create(
sort,
maxDocs,
fillFields,
searcher.isFieldSortDoTrackScores(),
searcher.isFieldSortDoMaxScore()
);
}
return topCollector;
}
}
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