/* $Id: FullTextQueryImpl.java 19002 2010-03-16 01:28:07Z hardy.ferentschik $
*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2009, Red Hat, Inc. and/or its affiliates or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat, Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.search.query;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.Explanation;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Searcher;
import org.apache.lucene.search.Similarity;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TopDocs;
import org.slf4j.Logger;
import org.hibernate.Criteria;
import org.hibernate.HibernateException;
import org.hibernate.LockMode;
import org.hibernate.Query;
import org.hibernate.ScrollMode;
import org.hibernate.ScrollableResults;
import org.hibernate.Session;
import org.hibernate.LockOptions;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.engine.query.ParameterMetadata;
import org.hibernate.impl.AbstractQueryImpl;
import org.hibernate.impl.CriteriaImpl;
import org.hibernate.search.FullTextFilter;
import org.hibernate.search.FullTextQuery;
import org.hibernate.search.SearchException;
import org.hibernate.search.engine.DocumentBuilder;
import org.hibernate.search.engine.DocumentBuilderIndexedEntity;
import org.hibernate.search.engine.DocumentExtractor;
import org.hibernate.search.engine.EntityInfo;
import org.hibernate.search.engine.FilterDef;
import org.hibernate.search.engine.Loader;
import org.hibernate.search.engine.MultiClassesQueryLoader;
import org.hibernate.search.engine.ProjectionLoader;
import org.hibernate.search.engine.QueryLoader;
import org.hibernate.search.engine.SearchFactoryImplementor;
import org.hibernate.search.filter.ChainedFilter;
import org.hibernate.search.filter.FilterKey;
import org.hibernate.search.filter.StandardFilterKey;
import org.hibernate.search.filter.FullTextFilterImplementor;
import org.hibernate.search.filter.ShardSensitiveOnlyFilter;
import org.hibernate.search.reader.ReaderProvider;
import static org.hibernate.search.reader.ReaderProviderHelper.getIndexReaders;
import org.hibernate.search.store.DirectoryProvider;
import org.hibernate.search.store.IndexShardingStrategy;
import org.hibernate.search.util.ContextHelper;
import static org.hibernate.search.util.FilterCacheModeTypeHelper.cacheInstance;
import static org.hibernate.search.util.FilterCacheModeTypeHelper.cacheResults;
import org.hibernate.search.util.LoggerFactory;
import org.hibernate.transform.ResultTransformer;
import org.hibernate.util.ReflectHelper;
/**
* Implementation of {@link org.hibernate.search.FullTextQuery}.
*
* @author Emmanuel Bernard
* @author Hardy Ferentschik
* @todo Implements setParameter()
*/
public class FullTextQueryImpl extends AbstractQueryImpl implements FullTextQuery {
private static final Logger log = LoggerFactory.make();
private final org.apache.lucene.search.Query luceneQuery;
private Set<Class<?>> indexedTargetedEntities;
private List<Class<?>> targetedEntities;
private Set<Class<?>> classesAndSubclasses;
//optimization: if we can avoid the filter clause (we can most of the time) do it as it has a significant perf impact
private boolean needClassFilterClause;
private Integer firstResult;
private Integer maxResults;
private Integer resultSize;
private Sort sort;
private Filter filter;
private Filter userFilter;
private Criteria criteria;
private String[] indexProjection;
private Set<String> idFieldNames;
private boolean allowFieldSelectionInProjection = true;
private ResultTransformer resultTransformer;
private SearchFactoryImplementor searchFactoryImplementor;
private final Map<String, FullTextFilterImpl> filterDefinitions = new HashMap<String, FullTextFilterImpl>();
private int fetchSize = 1;
private static final FullTextFilterImplementor[] EMPTY_FULL_TEXT_FILTER_IMPLEMENTOR = new FullTextFilterImplementor[0];
/**
* Constructs a <code>FullTextQueryImpl</code> instance.
*
* @param query The Lucene query.
* @param classes Array of classes (must be immutable) used to filter the results to the given class types.
* @param session Access to the Hibernate session.
* @param parameterMetadata Additional query metadata.
*/
public FullTextQueryImpl(org.apache.lucene.search.Query query, Class<?>[] classes, SessionImplementor session,
ParameterMetadata parameterMetadata) {
//TODO handle flushMode
super( query.toString(), null, session, parameterMetadata );
this.luceneQuery = query;
this.targetedEntities = Arrays.asList( classes );
searchFactoryImplementor = getSearchFactoryImplementor();
this.indexedTargetedEntities = searchFactoryImplementor.getIndexedTypesPolymorphic( classes );
if ( classes != null && classes.length > 0 && indexedTargetedEntities.size() == 0 ) {
String msg = "None of the specified entity types or any of their subclasses are indexed.";
throw new IllegalArgumentException( msg );
}
}
/**
* {@inheritDoc}
*/
public FullTextQuery setSort(Sort sort) {
this.sort = sort;
return this;
}
/**
* {@inheritDoc}
*/
public FullTextQuery setFilter(Filter filter) {
this.userFilter = filter;
return this;
}
/**
* Return an iterator on the results.
* Retrieve the object one by one (initialize it during the next() operation)
*/
public Iterator iterate() throws HibernateException {
//implement an iterator which keep the id/class for each hit and get the object on demand
//cause I can't keep the searcher and hence the hit opened. I don't have any hook to know when the
//user stops using it
//scrollable is better in this area
//find the directories
IndexSearcher searcher = buildSearcher( searchFactoryImplementor );
if ( searcher == null ) {
return new IteratorImpl( Collections.EMPTY_LIST, noLoader );
}
try {
QueryHits queryHits = getQueryHits( searcher, calculateTopDocsRetrievalSize() );
int first = first();
int max = max( first, queryHits.totalHits );
int size = max - first + 1 < 0 ? 0 : max - first + 1;
List<EntityInfo> infos = new ArrayList<EntityInfo>( size );
DocumentExtractor extractor = new DocumentExtractor(
queryHits, searchFactoryImplementor, indexProjection, idFieldNames, allowFieldSelectionInProjection
);
for ( int index = first; index <= max; index++ ) {
infos.add( extractor.extract( index ) );
}
Loader loader = getLoader();
return new IteratorImpl( infos, loader );
}
catch ( IOException e ) {
throw new HibernateException( "Unable to query Lucene index", e );
}
finally {
try {
closeSearcher( searcher, searchFactoryImplementor.getReaderProvider() );
}
catch ( SearchException e ) {
log.warn( "Unable to properly close searcher during lucene query: " + getQueryString(), e );
}
}
}
/**
* Decide which object loader to use depending on the targeted entities. If there is only a single entity targeted
* a <code>QueryLoader</code> can be used which will only execute a single query to load the entities. If more than
* one entity is targeted a <code>MultiClassesQueryLoader</code> must be used. We also have to consider whether
* projections or <code>Criteria</code> are used.
*
* @return The loader instance to use to load the results of the query.
*/
private Loader getLoader() {
Loader loader;
if ( indexProjection != null ) {
loader = getProjectionLoader();
}
else if ( criteria != null ) {
loader = getCriteriaLoader();
}
else if ( targetedEntities.size() == 1 ) {
loader = getSingleEntityLoader();
}
else {
loader = getMultipleEntitiesLoader();
}
return loader;
}
private Loader getMultipleEntitiesLoader() {
final MultiClassesQueryLoader multiClassesLoader = new MultiClassesQueryLoader();
multiClassesLoader.init( ( Session ) session, searchFactoryImplementor );
multiClassesLoader.setEntityTypes( indexedTargetedEntities );
return multiClassesLoader;
}
private Loader getSingleEntityLoader() {
final QueryLoader queryLoader = new QueryLoader();
queryLoader.init( ( Session ) session, searchFactoryImplementor );
queryLoader.setEntityType( targetedEntities.iterator().next() );
return queryLoader;
}
private Loader getCriteriaLoader() {
if ( targetedEntities.size() > 1 ) {
throw new SearchException( "Cannot mix criteria and multiple entity types" );
}
Class entityType = targetedEntities.size() == 0 ? null : targetedEntities.iterator().next();
if ( criteria instanceof CriteriaImpl ) {
String targetEntity = ( ( CriteriaImpl ) criteria ).getEntityOrClassName();
if ( entityType != null && !entityType.getName().equals( targetEntity ) ) {
throw new SearchException( "Criteria query entity should match query entity" );
}
else {
try {
entityType = ReflectHelper.classForName( targetEntity );
}
catch ( ClassNotFoundException e ) {
throw new SearchException( "Unable to load entity class from criteria: " + targetEntity, e );
}
}
}
QueryLoader queryLoader = new QueryLoader();
queryLoader.init( ( Session ) session, searchFactoryImplementor );
queryLoader.setEntityType( entityType );
queryLoader.setCriteria( criteria );
return queryLoader;
}
private Loader getProjectionLoader() {
ProjectionLoader loader = new ProjectionLoader();
loader.init( ( Session ) session, searchFactoryImplementor, resultTransformer, indexProjection );
loader.setEntityTypes( indexedTargetedEntities );
return loader;
}
public ScrollableResults scroll() throws HibernateException {
//keep the searcher open until the resultset is closed
//find the directories
IndexSearcher searcher = buildSearcher( searchFactoryImplementor );
//FIXME: handle null searcher
try {
QueryHits queryHits = getQueryHits( searcher, calculateTopDocsRetrievalSize() );
int first = first();
int max = max( first, queryHits.totalHits );
DocumentExtractor extractor = new DocumentExtractor(
queryHits, searchFactoryImplementor, indexProjection, idFieldNames, allowFieldSelectionInProjection
);
Loader loader = getLoader();
return new ScrollableResultsImpl(
searcher, first, max, fetchSize, extractor, loader, searchFactoryImplementor, this.session
);
}
catch ( IOException e ) {
//close only in case of exception
try {
closeSearcher( searcher, searchFactoryImplementor.getReaderProvider() );
}
catch ( SearchException ee ) {
//we have the initial issue already
}
throw new HibernateException( "Unable to query Lucene index", e );
}
}
public ScrollableResults scroll(ScrollMode scrollMode) throws HibernateException {
//TODO think about this scrollmode
return scroll();
}
public List list() throws HibernateException {
//find the directories
IndexSearcher searcher = buildSearcher( searchFactoryImplementor );
if ( searcher == null ) {
return Collections.EMPTY_LIST;
}
try {
QueryHits queryHits = getQueryHits( searcher, calculateTopDocsRetrievalSize() );
int first = first();
int max = max( first, queryHits.totalHits );
int size = max - first + 1 < 0 ? 0 : max - first + 1;
List<EntityInfo> infos = new ArrayList<EntityInfo>( size );
DocumentExtractor extractor = new DocumentExtractor(
queryHits, searchFactoryImplementor, indexProjection, idFieldNames, allowFieldSelectionInProjection
);
for ( int index = first; index <= max; index++ ) {
infos.add( extractor.extract( index ) );
}
Loader loader = getLoader();
List list = loader.load( infos.toArray( new EntityInfo[infos.size()] ) );
if ( resultTransformer == null || loader instanceof ProjectionLoader ) {
//stay consistent with transformTuple which can only be executed during a projection
return list;
}
else {
return resultTransformer.transformList( list );
}
}
catch ( IOException e ) {
throw new HibernateException( "Unable to query Lucene index", e );
}
finally {
try {
closeSearcher( searcher, searchFactoryImplementor.getReaderProvider() );
}
catch ( SearchException e ) {
log.warn( "Unable to properly close searcher during lucene query: " + getQueryString(), e );
}
}
}
public Explanation explain(int documentId) {
Explanation explanation = null;
Searcher searcher = buildSearcher( searchFactoryImplementor );
if ( searcher == null ) {
throw new SearchException(
"Unable to build explanation for document id:"
+ documentId + ". no index found"
);
}
try {
org.apache.lucene.search.Query query = filterQueryByClasses( luceneQuery );
buildFilters();
explanation = searcher.explain( query, documentId );
}
catch ( IOException e ) {
throw new HibernateException( "Unable to query Lucene index and build explanation", e );
}
finally {
//searcher cannot be null
try {
closeSearcher( searcher, searchFactoryImplementor.getReaderProvider() );
}
catch ( SearchException e ) {
log.warn( "Unable to properly close searcher during lucene query: " + getQueryString(), e );
}
}
return explanation;
}
/**
* Execute the lucene search and return the matching hits.
*
* @param searcher The index searcher.
* @param n Numer of documents to retrieve
*
* @return An instance of <code>QueryHits</code> wrapping the Lucene query and the matching documents.
*
* @throws IOException in case there is an error executing the lucene search.
*/
private QueryHits getQueryHits(Searcher searcher, Integer n) throws IOException {
org.apache.lucene.search.Query query = filterQueryByClasses( luceneQuery );
buildFilters();
QueryHits queryHits;
if ( n == null ) { // try to make sure that we get the right amount of top docs
queryHits = new QueryHits( searcher, query, filter, sort );
}
else {
queryHits = new QueryHits( searcher, query, filter, sort, n );
}
resultSize = queryHits.totalHits;
return queryHits;
}
/**
* @return Calculates the number of <code>TopDocs</code> which should be retrieved as part of the query. If Hibernate's
* pagination parameters are set returned value is <code>first + maxResults</code>. Otherwise <code>null</code> is
* returned.
*/
private Integer calculateTopDocsRetrievalSize() {
if ( maxResults == null ) {
return null;
}
else {
long tmpMaxResult = ( long ) first() + maxResults;
if ( tmpMaxResult >= Integer.MAX_VALUE ) {
// don't return just Integer.MAX_VALUE due to a bug in Lucene - see HSEARCH-330
return Integer.MAX_VALUE - 1;
}
else {
return ( int ) tmpMaxResult;
}
}
}
private void buildFilters() {
ChainedFilter chainedFilter = null;
if ( !filterDefinitions.isEmpty() ) {
chainedFilter = new ChainedFilter();
for ( FullTextFilterImpl fullTextFilter : filterDefinitions.values() ) {
Filter filter = buildLuceneFilter( fullTextFilter );
if ( filter != null ) {
chainedFilter.addFilter( filter );
}
}
}
if ( userFilter != null ) {
//chainedFilter is not always necessary here but the code is easier to read
if ( chainedFilter == null ) {
chainedFilter = new ChainedFilter();
}
chainedFilter.addFilter( userFilter );
}
if ( chainedFilter == null || chainedFilter.isEmpty() ) {
filter = null;
}
else {
filter = chainedFilter;
}
}
/**
* Builds a Lucene filter using the given <code>FullTextFilter</code>.
*
* @param fullTextFilter the Hibernate specific <code>FullTextFilter</code> used to create the
* Lucene <code>Filter</code>.
*
* @return the Lucene filter mapped to the filter definition
*/
private Filter buildLuceneFilter(FullTextFilterImpl fullTextFilter) {
/*
* FilterKey implementations and Filter(Factory) do not have to be threadsafe wrt their parameter injection
* as FilterCachingStrategy ensure a memory barrier between concurrent thread calls
*/
FilterDef def = searchFactoryImplementor.getFilterDefinition( fullTextFilter.getName() );
//def can never be null, ti's guarded by enableFullTextFilter(String)
if ( isPreQueryFilterOnly( def ) ) {
return null;
}
Object instance = createFilterInstance( fullTextFilter, def );
FilterKey key = createFilterKey( def, instance );
// try to get the filter out of the cache
Filter filter = cacheInstance( def.getCacheMode() ) ?
searchFactoryImplementor.getFilterCachingStrategy().getCachedFilter( key ) :
null;
if ( filter == null ) {
filter = createFilter( def, instance );
// add filter to cache if we have to
if ( cacheInstance( def.getCacheMode() ) ) {
searchFactoryImplementor.getFilterCachingStrategy().addCachedFilter( key, filter );
}
}
return filter;
}
private boolean isPreQueryFilterOnly(FilterDef def) {
return def.getImpl().equals( ShardSensitiveOnlyFilter.class );
}
private Filter createFilter(FilterDef def, Object instance) {
Filter filter;
if ( def.getFactoryMethod() != null ) {
try {
filter = ( Filter ) def.getFactoryMethod().invoke( instance );
}
catch ( IllegalAccessException e ) {
throw new SearchException(
"Unable to access @Factory method: "
+ def.getImpl().getName() + "." + def.getFactoryMethod().getName()
);
}
catch ( InvocationTargetException e ) {
throw new SearchException(
"Unable to access @Factory method: "
+ def.getImpl().getName() + "." + def.getFactoryMethod().getName()
);
}
catch ( ClassCastException e ) {
throw new SearchException(
"@Key method does not return a org.apache.lucene.search.Filter class: "
+ def.getImpl().getName() + "." + def.getFactoryMethod().getName()
);
}
}
else {
try {
filter = ( Filter ) instance;
}
catch ( ClassCastException e ) {
throw new SearchException(
"Filter implementation does not implement the Filter interface: "
+ def.getImpl().getName() + ". "
+ ( def.getFactoryMethod() != null ? def.getFactoryMethod().getName() : "" ), e
);
}
}
filter = addCachingWrapperFilter( filter, def );
return filter;
}
/**
* Decides whether to wrap the given filter around a <code>CachingWrapperFilter<code>.
*
* @param filter the filter which maybe gets wrapped.
* @param def The filter definition used to decide whether wrapping should occur or not.
*
* @return The original filter or wrapped filter depending on the information extracted from
* <code>def</code>.
*/
private Filter addCachingWrapperFilter(Filter filter, FilterDef def) {
if ( cacheResults( def.getCacheMode() ) ) {
int cachingWrapperFilterSize = searchFactoryImplementor.getFilterCacheBitResultsSize();
filter = new org.hibernate.search.filter.CachingWrapperFilter( filter, cachingWrapperFilterSize );
}
return filter;
}
private FilterKey createFilterKey(FilterDef def, Object instance) {
FilterKey key = null;
if ( !cacheInstance( def.getCacheMode() ) ) {
return key; // if the filter is not cached there is no key!
}
if ( def.getKeyMethod() == null ) {
key = new FilterKey() {
public int hashCode() {
return getImpl().hashCode();
}
public boolean equals(Object obj) {
if ( !( obj instanceof FilterKey ) ) {
return false;
}
FilterKey that = ( FilterKey ) obj;
return this.getImpl().equals( that.getImpl() );
}
};
}
else {
try {
key = ( FilterKey ) def.getKeyMethod().invoke( instance );
}
catch ( IllegalAccessException e ) {
throw new SearchException(
"Unable to access @Key method: "
+ def.getImpl().getName() + "." + def.getKeyMethod().getName()
);
}
catch ( InvocationTargetException e ) {
throw new SearchException(
"Unable to access @Key method: "
+ def.getImpl().getName() + "." + def.getKeyMethod().getName()
);
}
catch ( ClassCastException e ) {
throw new SearchException(
"@Key method does not return FilterKey: "
+ def.getImpl().getName() + "." + def.getKeyMethod().getName()
);
}
}
key.setImpl( def.getImpl() );
//Make sure Filters are isolated by filter def name
StandardFilterKey wrapperKey = new StandardFilterKey();
wrapperKey.addParameter( def.getName() );
wrapperKey.addParameter( key );
return wrapperKey;
}
private Object createFilterInstance(FullTextFilterImpl fullTextFilter,
FilterDef def) {
Object instance;
try {
instance = def.getImpl().newInstance();
}
catch ( InstantiationException e ) {
throw new SearchException( "Unable to create @FullTextFilterDef: " + def.getImpl(), e );
}
catch ( IllegalAccessException e ) {
throw new SearchException( "Unable to create @FullTextFilterDef: " + def.getImpl(), e );
}
for ( Map.Entry<String, Object> entry : fullTextFilter.getParameters().entrySet() ) {
def.invoke( entry.getKey(), instance, entry.getValue() );
}
if ( cacheInstance( def.getCacheMode() ) && def.getKeyMethod() == null && fullTextFilter.getParameters()
.size() > 0 ) {
throw new SearchException( "Filter with parameters and no @Key method: " + fullTextFilter.getName() );
}
return instance;
}
private org.apache.lucene.search.Query filterQueryByClasses(org.apache.lucene.search.Query luceneQuery) {
if ( !needClassFilterClause ) {
return luceneQuery;
}
else {
//A query filter is more practical than a manual class filtering post query (esp on scrollable resultsets)
//it also probably minimise the memory footprint
BooleanQuery classFilter = new BooleanQuery();
//annihilate the scoring impact of DocumentBuilderIndexedEntity.CLASS_FIELDNAME
classFilter.setBoost( 0 );
for ( Class clazz : classesAndSubclasses ) {
Term t = new Term( DocumentBuilder.CLASS_FIELDNAME, clazz.getName() );
TermQuery termQuery = new TermQuery( t );
classFilter.add( termQuery, BooleanClause.Occur.SHOULD );
}
BooleanQuery filteredQuery = new BooleanQuery();
filteredQuery.add( luceneQuery, BooleanClause.Occur.MUST );
filteredQuery.add( classFilter, BooleanClause.Occur.MUST );
return filteredQuery;
}
}
private int max(int first, int totalHits) {
if ( maxResults == null ) {
return totalHits - 1;
}
else {
return maxResults + first < totalHits ?
first + maxResults - 1 :
totalHits - 1;
}
}
private int first() {
return firstResult != null ?
firstResult :
0;
}
/**
* Build the index searcher for this fulltext query.
*
* @param searchFactoryImplementor the search factory.
*
* @return the <code>IndexSearcher</code> for this query (can be <code>null</code>.
* TODO change classesAndSubclasses by side effect, which is a mismatch with the Searcher return, fix that.
*/
private IndexSearcher buildSearcher(SearchFactoryImplementor searchFactoryImplementor) {
Map<Class<?>, DocumentBuilderIndexedEntity<?>> builders = searchFactoryImplementor.getDocumentBuildersIndexedEntities();
List<DirectoryProvider> targetedDirectories = new ArrayList<DirectoryProvider>();
Set<String> idFieldNames = new HashSet<String>();
Similarity searcherSimilarity = null;
//TODO check if caching this work for the last n list of indexedTargetedEntities makes a perf boost
if ( indexedTargetedEntities.size() == 0 ) {
// empty indexedTargetedEntities array means search over all indexed enities,
// but we have to make sure there is at least one
if ( builders.isEmpty() ) {
throw new HibernateException(
"There are no mapped entities. Don't forget to add @Indexed to at least one class."
);
}
for ( DocumentBuilderIndexedEntity builder : builders.values() ) {
searcherSimilarity = checkSimilarity( searcherSimilarity, builder );
if ( builder.getIdKeywordName() != null ) {
idFieldNames.add( builder.getIdKeywordName() );
allowFieldSelectionInProjection = allowFieldSelectionInProjection && builder.allowFieldSelectionInProjection();
}
populateDirectories( targetedDirectories, builder );
}
classesAndSubclasses = null;
}
else {
Set<Class<?>> involvedClasses = new HashSet<Class<?>>( indexedTargetedEntities.size() );
involvedClasses.addAll( indexedTargetedEntities );
for ( Class<?> clazz : indexedTargetedEntities ) {
DocumentBuilderIndexedEntity<?> builder = builders.get( clazz );
if ( builder != null ) {
involvedClasses.addAll( builder.getMappedSubclasses() );
}
}
for ( Class clazz : involvedClasses ) {
DocumentBuilderIndexedEntity builder = builders.get( clazz );
//TODO should we rather choose a polymorphic path and allow non mapped entities
if ( builder == null ) {
throw new HibernateException( "Not a mapped entity (don't forget to add @Indexed): " + clazz );
}
if ( builder.getIdKeywordName() != null ) {
idFieldNames.add( builder.getIdKeywordName() );
allowFieldSelectionInProjection = allowFieldSelectionInProjection && builder.allowFieldSelectionInProjection();
}
searcherSimilarity = checkSimilarity( searcherSimilarity, builder );
populateDirectories( targetedDirectories, builder );
}
this.classesAndSubclasses = involvedClasses;
}
this.idFieldNames = idFieldNames;
//compute optimization needClassFilterClause
//if at least one DP contains one class that is not part of the targeted classesAndSubclasses we can't optimize
if ( classesAndSubclasses != null ) {
for ( DirectoryProvider dp : targetedDirectories ) {
final Set<Class<?>> classesInDirectoryProvider = searchFactoryImplementor.getClassesInDirectoryProvider(
dp
);
// if a DP contains only one class, we know for sure it's part of classesAndSubclasses
if ( classesInDirectoryProvider.size() > 1 ) {
//risk of needClassFilterClause
for ( Class clazz : classesInDirectoryProvider ) {
if ( !classesAndSubclasses.contains( clazz ) ) {
this.needClassFilterClause = true;
break;
}
}
}
if ( this.needClassFilterClause ) {
break;
}
}
}
//set up the searcher
final DirectoryProvider[] directoryProviders = targetedDirectories.toArray(
new DirectoryProvider[targetedDirectories.size()]
);
IndexSearcher is = new IndexSearcher(
searchFactoryImplementor.getReaderProvider().openReader(
directoryProviders
)
);
is.setSimilarity( searcherSimilarity );
return is;
}
private void populateDirectories(List<DirectoryProvider> directories, DocumentBuilderIndexedEntity builder) {
final IndexShardingStrategy indexShardingStrategy = builder.getDirectoryProviderSelectionStrategy();
final DirectoryProvider[] directoryProviders;
if ( filterDefinitions != null && !filterDefinitions.isEmpty() ) {
directoryProviders = indexShardingStrategy.getDirectoryProvidersForQuery(
filterDefinitions.values().toArray( new FullTextFilterImplementor[filterDefinitions.size()] )
);
}
else {
//no filter get all shards
directoryProviders = indexShardingStrategy.getDirectoryProvidersForQuery( EMPTY_FULL_TEXT_FILTER_IMPLEMENTOR );
}
for ( DirectoryProvider provider : directoryProviders ) {
if ( !directories.contains( provider ) ) {
directories.add( provider );
}
}
}
private Similarity checkSimilarity(Similarity similarity, DocumentBuilderIndexedEntity builder) {
if ( similarity == null ) {
similarity = builder.getSimilarity();
}
else if ( !similarity.getClass().equals( builder.getSimilarity().getClass() ) ) {
throw new HibernateException(
"Cannot perform search on two entities with differing Similarity implementations (" + similarity.getClass()
.getName() + " & " + builder.getSimilarity().getClass().getName() + ")"
);
}
return similarity;
}
private void closeSearcher(Searcher searcher, ReaderProvider readerProvider) {
Set<IndexReader> indexReaders = getIndexReaders( searcher );
for ( IndexReader indexReader : indexReaders ) {
readerProvider.closeReader( indexReader );
}
}
public int getResultSize() {
if ( resultSize == null ) {
//get result size without object initialization
IndexSearcher searcher = buildSearcher( searchFactoryImplementor );
if ( searcher == null ) {
resultSize = 0;
}
else {
TopDocs hits;
try {
hits = getQueryHits(
searcher, 1
).topDocs; // Lucene enforces that at least one top doc will be retrieved.
resultSize = hits.totalHits;
}
catch ( IOException e ) {
throw new HibernateException( "Unable to query Lucene index", e );
}
finally {
//searcher cannot be null
try {
closeSearcher( searcher, searchFactoryImplementor.getReaderProvider() );
//searchFactoryImplementor.getReaderProvider().closeReader( searcher.getIndexReader() );
}
catch ( SearchException e ) {
log.warn( "Unable to properly close searcher during lucene query: " + getQueryString(), e );
}
}
}
}
return this.resultSize;
}
public FullTextQuery setCriteriaQuery(Criteria criteria) {
this.criteria = criteria;
return this;
}
public FullTextQuery setProjection(String... fields) {
if ( fields == null || fields.length == 0 ) {
this.indexProjection = null;
}
else {
this.indexProjection = fields;
}
return this;
}
public FullTextQuery setFirstResult(int firstResult) {
if ( firstResult < 0 ) {
throw new IllegalArgumentException( "'first' pagination parameter less than 0" );
}
this.firstResult = firstResult;
return this;
}
public FullTextQuery setMaxResults(int maxResults) {
if ( maxResults < 0 ) {
throw new IllegalArgumentException( "'max' pagination parameter less than 0" );
}
this.maxResults = maxResults;
return this;
}
public FullTextQuery setFetchSize(int fetchSize) {
super.setFetchSize( fetchSize );
if ( fetchSize <= 0 ) {
throw new IllegalArgumentException( "'fetch size' parameter less than or equals to 0" );
}
this.fetchSize = fetchSize;
return this;
}
public Query setLockOptions(LockOptions lockOptions) {
throw new UnsupportedOperationException( "Lock options are not implemented in Hibernate Search queries" );
}
@Override
public FullTextQuery setResultTransformer(ResultTransformer transformer) {
super.setResultTransformer( transformer );
this.resultTransformer = transformer;
return this;
}
public <T> T unwrap(Class<T> type) {
if ( type == org.apache.lucene.search.Query.class) {
return (T) luceneQuery;
}
throw new IllegalArgumentException("Cannot unwrap " + type.getName() );
}
public LockOptions getLockOptions() {
throw new UnsupportedOperationException( "Lock options are not implemented in Hibernate Search queries" );
}
public int executeUpdate() throws HibernateException {
throw new UnsupportedOperationException( "executeUpdate is not supported in Hibernate Search queries" );
}
public Query setLockMode(String alias, LockMode lockMode) {
throw new UnsupportedOperationException( "Lock options are not implemented in Hibernate Search queries" );
}
protected Map getLockModes() {
throw new UnsupportedOperationException( "Lock options are not implemented in Hibernate Search queries" );
}
public FullTextFilter enableFullTextFilter(String name) {
FullTextFilterImpl filterDefinition = filterDefinitions.get( name );
if ( filterDefinition != null ) {
return filterDefinition;
}
filterDefinition = new FullTextFilterImpl();
filterDefinition.setName( name );
FilterDef filterDef = searchFactoryImplementor.getFilterDefinition( name );
if ( filterDef == null ) {
throw new SearchException( "Unkown @FullTextFilter: " + name );
}
filterDefinitions.put( name, filterDefinition );
return filterDefinition;
}
public void disableFullTextFilter(String name) {
filterDefinitions.remove( name );
}
private SearchFactoryImplementor getSearchFactoryImplementor() {
if ( searchFactoryImplementor == null ) {
searchFactoryImplementor = ContextHelper.getSearchFactoryBySFI( session );
}
return searchFactoryImplementor;
}
private static Loader noLoader = new Loader() {
public void init(Session session, SearchFactoryImplementor searchFactoryImplementor) {
}
public Object load(EntityInfo entityInfo) {
throw new UnsupportedOperationException( "noLoader should not be used" );
}
public List load(EntityInfo... entityInfos) {
throw new UnsupportedOperationException( "noLoader should not be used" );
}
};
}