Package org.hibernate.search.spi

Source Code of org.hibernate.search.spi.SearchFactoryBuilder$BuildContext

/*
* 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 <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/

package org.hibernate.search.spi;

import java.beans.Introspector;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

import org.hibernate.annotations.common.reflection.MetadataProvider;
import org.hibernate.annotations.common.reflection.MetadataProviderInjector;
import org.hibernate.annotations.common.reflection.ReflectionManager;
import org.hibernate.annotations.common.reflection.XClass;
import org.hibernate.annotations.common.reflection.java.JavaReflectionManager;
import org.hibernate.search.annotations.AnalyzerDef;
import org.hibernate.search.annotations.AnalyzerDefs;
import org.hibernate.search.annotations.Factory;
import org.hibernate.search.annotations.FullTextFilterDef;
import org.hibernate.search.annotations.FullTextFilterDefs;
import org.hibernate.search.annotations.Indexed;
import org.hibernate.search.annotations.Key;
import org.hibernate.search.backend.impl.BatchedQueueingProcessor;
import org.hibernate.search.backend.impl.QueueingProcessor;
import org.hibernate.search.backend.impl.WorkerFactory;
import org.hibernate.search.cfg.Environment;
import org.hibernate.search.cfg.SearchMapping;
import org.hibernate.search.cfg.spi.SearchConfiguration;
import org.hibernate.search.engine.Version;
import org.hibernate.search.engine.impl.DefaultTimingSource;
import org.hibernate.search.engine.impl.FilterDef;
import org.hibernate.search.engine.impl.MutableEntityIndexBinding;
import org.hibernate.search.engine.metadata.impl.AnnotationMetadataProvider;
import org.hibernate.search.engine.metadata.impl.TypeMetadata;
import org.hibernate.search.engine.service.impl.StandardServiceManager;
import org.hibernate.search.engine.service.spi.ServiceManager;
import org.hibernate.search.engine.spi.DocumentBuilderContainedEntity;
import org.hibernate.search.engine.spi.DocumentBuilderIndexedEntity;
import org.hibernate.search.engine.spi.EntityIndexBinding;
import org.hibernate.search.engine.spi.EntityState;
import org.hibernate.search.engine.spi.SearchFactoryImplementor;
import org.hibernate.search.exception.ErrorHandler;
import org.hibernate.search.exception.SearchException;
import org.hibernate.search.exception.impl.LogErrorHandler;
import org.hibernate.search.filter.FilterCachingStrategy;
import org.hibernate.search.filter.ShardSensitiveOnlyFilter;
import org.hibernate.search.filter.impl.CachingWrapperFilter;
import org.hibernate.search.filter.impl.MRUFilterCachingStrategy;
import org.hibernate.search.impl.ConfigContext;
import org.hibernate.search.impl.ImmutableSearchFactory;
import org.hibernate.search.impl.IncrementalSearchConfiguration;
import org.hibernate.search.impl.MappingModelMetadataProvider;
import org.hibernate.search.impl.MutableSearchFactory;
import org.hibernate.search.impl.MutableSearchFactoryState;
import org.hibernate.search.impl.ReflectionReplacingSearchConfiguration;
import org.hibernate.search.impl.SearchMappingBuilder;
import org.hibernate.search.indexes.impl.IndexManagerHolder;
import org.hibernate.search.spi.impl.PolymorphicIndexHierarchy;
import org.hibernate.search.spi.impl.SearchFactoryImplementorWithShareableState;
import org.hibernate.search.spi.impl.SearchFactoryState;
import org.hibernate.search.util.StringHelper;
import org.hibernate.search.util.configuration.impl.ConfigurationParseHelper;
import org.hibernate.search.util.impl.ClassLoaderHelper;
import org.hibernate.search.util.impl.ReflectionHelper;
import org.hibernate.search.util.logging.impl.Log;
import org.hibernate.search.util.logging.impl.LoggerFactory;

/**
* Build a search factory following the builder pattern.
*
* @author Emmanuel Bernard
* @author Hardy Ferentschik
* @author Sanne Grinovero
*/
public class SearchFactoryBuilder {

  static {
    Version.touch();
  }

  private static final Log log = LoggerFactory.make();

  private SearchConfiguration cfg;
  private MutableSearchFactory rootFactory;
  private final List<Class<?>> classes = new ArrayList<Class<?>>();

  public SearchFactoryBuilder configuration(SearchConfiguration configuration) {
    this.cfg = configuration;
    return this;
  }

  public SearchFactoryBuilder currentFactory(SearchFactoryIntegrator factory) {
    //We know that the only expected concrete type is MutableSearchFactory
    //This could fail if some fancy framework proxy the object but at this stage they likely won't
    //even proxy SearchFactoryIntegrator.
    //If that happens we can provide a unwrap method to SearchFactory
    this.rootFactory = (MutableSearchFactory) factory;
    return this;
  }

  public SearchFactoryBuilder addClass(Class<?> clazz) {
    classes.add( clazz );
    return this;
  }

  private final MutableSearchFactoryState factoryState = new MutableSearchFactoryState();

  public SearchFactoryImplementor buildSearchFactory() {
    SearchFactoryImplementor searchFactoryImplementor;
    if ( rootFactory == null ) {
      if ( classes.size() > 0 ) {
        throw new SearchException( "Cannot add a class if the original SearchFactory is not passed" );
      }
      searchFactoryImplementor = buildNewSearchFactory();
    }
    else {
      searchFactoryImplementor = buildIncrementalSearchFactory();
    }
    return searchFactoryImplementor;
  }

  private SearchFactoryImplementor buildIncrementalSearchFactory() {
    removeClassesAlreadyManaged();
    if ( classes.size() == 0 ) {
      return rootFactory;
    }
    factoryState.copyStateFromOldFactory( rootFactory );

    final Properties configurationProperties = factoryState.getConfigurationProperties();
    BuildContext buildContext = new BuildContext();

    IncrementalSearchConfiguration searchConfiguration = new IncrementalSearchConfiguration(
        classes,
        configurationProperties,
        factoryState
    );

    applySearchMappingToMetadata(
        searchConfiguration.getReflectionManager(),
        searchConfiguration.getProgrammaticMapping()
    );

    //FIXME The current initDocumentBuilders
    initDocumentBuilders( searchConfiguration, buildContext, searchConfiguration.getProgrammaticMapping() );
    final Map<Class<?>, EntityIndexBinding> documentBuildersIndexedEntities = factoryState.getIndexBindings();
    Set<Class<?>> indexedClasses = documentBuildersIndexedEntities.keySet();
    for ( EntityIndexBinding entityIndexBinding : documentBuildersIndexedEntities.values() ) {
      //FIXME improve this algorithm to deal with adding new classes to the class hierarchy.
      //Today it seems only safe when a class outside the hierarchy is incrementally added.
      entityIndexBinding.postInitialize( indexedClasses );
    }

    //not really necessary today
    final Map<Class<?>, DocumentBuilderContainedEntity> documentBuildersContainedEntities = factoryState.getDocumentBuildersContainedEntities();
    for ( DocumentBuilderContainedEntity builder : documentBuildersContainedEntities.values() ) {
      builder.postInitialize( indexedClasses );
    }

    //update backend
    //TODO make sure the old IndexManagers and backends are disposed - not currently a problem as we only support adding entities incrementally
    SearchFactoryImplementorWithShareableState factory = new ImmutableSearchFactory( factoryState );
    factoryState.setActiveSearchFactory( factory );
    rootFactory.setDelegate( factory );
    return rootFactory;
  }

  private void removeClassesAlreadyManaged() {
    Set<Class<?>> remove = new HashSet<Class<?>>();
    final Map<Class<?>, DocumentBuilderContainedEntity> containedEntities = rootFactory.getDocumentBuildersContainedEntities();
    final Map<Class<?>, EntityIndexBinding> indexedEntities = rootFactory.getIndexBindings();
    for ( Class<?> entity : classes ) {
      if ( indexedEntities.containsKey( entity ) || containedEntities.containsKey( entity ) ) {
        remove.add( entity );
      }
    }
    for ( Class<?> entity : remove ) {
      classes.remove( entity );
    }
  }

  private SearchFactoryImplementor buildNewSearchFactory() {
    BuildContext buildContext = new BuildContext();
    createCleanFactoryState( cfg, buildContext );

    final ReflectionManager reflectionManager = getReflectionManager( cfg );
    if ( reflectionManager != cfg.getReflectionManager() ) {
      cfg = new ReflectionReplacingSearchConfiguration( reflectionManager, cfg );
    }

    final SearchMapping mapping = SearchMappingBuilder.getSearchMapping( cfg );
    applySearchMappingToMetadata( reflectionManager, mapping );

    factoryState.setSearchMapping( mapping ); // might be null if feature is not used

    factoryState.setIndexingStrategy( defineIndexingStrategy( cfg ) );//need to be done before the document builds
    initDocumentBuilders( cfg, buildContext, mapping );

    final Map<Class<?>, EntityIndexBinding> documentBuildersIndexedEntities = factoryState.getIndexBindings();
    Set<Class<?>> indexedClasses = documentBuildersIndexedEntities.keySet();
    for ( EntityIndexBinding entityIndexBinding : documentBuildersIndexedEntities.values() ) {
      entityIndexBinding.postInitialize( indexedClasses );
    }

    // not really necessary today
    final Map<Class<?>, DocumentBuilderContainedEntity> documentBuildersContainedEntities = factoryState.getDocumentBuildersContainedEntities();
    for ( DocumentBuilderContainedEntity builder : documentBuildersContainedEntities.values() ) {
      builder.postInitialize( indexedClasses );
    }

    QueueingProcessor queueingProcessor = new BatchedQueueingProcessor(
        documentBuildersIndexedEntities,
        cfg.getProperties()
    );
    // build worker and back end components
    factoryState.setWorker( WorkerFactory.createWorker( cfg, buildContext, queueingProcessor ) );
    factoryState.setFilterCachingStrategy( buildFilterCachingStrategy( cfg ) );
    factoryState.setCacheBitResultsSize(
        ConfigurationParseHelper.getIntValue(
            cfg.getProperties(), Environment.CACHE_DOCIDRESULTS_SIZE, CachingWrapperFilter.DEFAULT_SIZE
        )
    );
    SearchFactoryImplementorWithShareableState factory = new ImmutableSearchFactory( factoryState );
    factoryState.setActiveSearchFactory( factory );
    rootFactory.setDelegate( factory );
    return rootFactory;
  }

  /**
   * We need to apply the programmatically configured mapping toe the reflectionManager
   * to fake the annotations.
   *
   * @param reflectionManager assumed a MetadataProviderInjector, it's state will be changed
   * @param mapping the SearchMapping to apply
   */
  private void applySearchMappingToMetadata(ReflectionManager reflectionManager, SearchMapping mapping) {
    if ( mapping != null ) {
      if ( !( reflectionManager instanceof MetadataProviderInjector ) ) {
        throw new SearchException(
            "Programmatic mapping model used but ReflectionManager does not implement "
                + MetadataProviderInjector.class.getName()
        );
      }
      MetadataProviderInjector injector = (MetadataProviderInjector) reflectionManager;
      MetadataProvider original = injector.getMetadataProvider();
      injector.setMetadataProvider( new MappingModelMetadataProvider( original, mapping ) );
    }
  }

  private FilterCachingStrategy buildFilterCachingStrategy(SearchConfiguration searchConfiguration) {
    FilterCachingStrategy filterCachingStrategy;
    String filterCachingStrategyName = searchConfiguration.getProperties()
        .getProperty( Environment.FILTER_CACHING_STRATEGY );
    if ( StringHelper.isEmpty( filterCachingStrategyName ) || "mru".equalsIgnoreCase( filterCachingStrategyName ) ) {
      filterCachingStrategy = new MRUFilterCachingStrategy();
    }
    else {
      Class<?> filterCachingStrategyClass = searchConfiguration.getClassLoaderService()
          .classForName( filterCachingStrategyName );
      filterCachingStrategy = ClassLoaderHelper.instanceFromClass(
          FilterCachingStrategy.class,
          filterCachingStrategyClass,
          "filterCachingStrategy"
      );
    }
    filterCachingStrategy.initialize( searchConfiguration.getProperties() );
    return filterCachingStrategy;
  }

  private void createCleanFactoryState(SearchConfiguration cfg, BuildContext buildContext) {
    if ( rootFactory == null ) {
      //set the mutable structure of factory state
      rootFactory = new MutableSearchFactory();
      factoryState.setDocumentBuildersIndexedEntities( new ConcurrentHashMap<Class<?>, EntityIndexBinding>() );
      factoryState.setDocumentBuildersContainedEntities( new ConcurrentHashMap<Class<?>, DocumentBuilderContainedEntity>() );
      factoryState.setFilterDefinitions( new ConcurrentHashMap<String, FilterDef>() );
      factoryState.setIndexHierarchy( new PolymorphicIndexHierarchy() );
      factoryState.setConfigurationProperties( cfg.getProperties() );
      factoryState.setServiceManager(
          new StandardServiceManager(
              cfg,
              buildContext,
              Environment.DEFAULT_SERVICES_MAP
          )
      );
      factoryState.setAllIndexesManager( new IndexManagerHolder() );
      factoryState.setErrorHandler( createErrorHandler( cfg ) );
      factoryState.setInstanceInitializer( cfg.getInstanceInitializer() );
      factoryState.setTimingSource( new DefaultTimingSource() );
      factoryState.setIndexMetadataComplete( cfg.isIndexMetadataComplete() );
      factoryState.setTransactionManagerExpected( cfg.isTransactionManagerExpected() );
      factoryState.setIdProvidedImplicit( cfg.isIdProvidedImplicit() );
    }
  }

  /*
   * Initialize the document builder
   * This algorithm seems to be safe for incremental search factories.
   */
  private void initDocumentBuilders(SearchConfiguration searchConfiguration, BuildContext buildContext, SearchMapping searchMapping) {
    ConfigContext configContext = new ConfigContext( searchConfiguration, buildContext, searchMapping );

    initProgrammaticAnalyzers( configContext, searchConfiguration.getReflectionManager() );
    initProgrammaticallyDefinedFilterDef( searchConfiguration.getReflectionManager() );
    final PolymorphicIndexHierarchy indexingHierarchy = factoryState.getIndexHierarchy();
    final Map<Class<?>, EntityIndexBinding> documentBuildersIndexedEntities = factoryState.getIndexBindings();
    final Map<Class<?>, DocumentBuilderContainedEntity> documentBuildersContainedEntities = factoryState.getDocumentBuildersContainedEntities();
    final Set<XClass> optimizationBlackListedTypes = new HashSet<XClass>();
    final Map<XClass, Class<?>> classMappings = initializeClassMappings(
        searchConfiguration,
        searchConfiguration.getReflectionManager()
    );

    //we process the @Indexed classes last, so we first start all IndexManager(s).
    final List<XClass> rootIndexedEntities = new LinkedList<XClass>();
    final org.hibernate.search.engine.metadata.impl.MetadataProvider metadataProvider =
        new AnnotationMetadataProvider( searchConfiguration.getReflectionManager(), configContext );

    for ( Map.Entry<XClass, Class<?>> mapping : classMappings.entrySet() ) {
      XClass mappedXClass = mapping.getKey();
      Class<?> mappedClass = mapping.getValue();

      if ( mappedXClass.isAnnotationPresent( Indexed.class ) ) {
        if ( mappedXClass.isAbstract() ) {
          log.abstractClassesCannotInsertDocuments( mappedXClass.getName() );
          continue;
        }

        rootIndexedEntities.add( mappedXClass );
        indexingHierarchy.addIndexedClass( mappedClass );
      }
      else if ( metadataProvider.containsSearchMetadata( mappedClass ) ) {
        //FIXME DocumentBuilderIndexedEntity needs to be built by a helper method receiving Class<T> to infer T properly
        //XClass unfortunately is not (yet) genericized: TODO?

        TypeMetadata typeMetadata = metadataProvider.getTypeMetadataFor( mappedClass );
        final DocumentBuilderContainedEntity documentBuilder = new DocumentBuilderContainedEntity(
            mappedXClass,
            typeMetadata,
            searchConfiguration.getReflectionManager(),
            optimizationBlackListedTypes,
            searchConfiguration.getInstanceInitializer()
        );
        //TODO enhance that, I don't like to expose EntityState
        if ( documentBuilder.getEntityState() != EntityState.NON_INDEXABLE ) {
          documentBuildersContainedEntities.put( mappedClass, documentBuilder );
        }
      }
      bindFilterDefs( mappedXClass );
      //TODO should analyzer def for classes at their same level???
    }

    IndexManagerHolder indexesFactory = factoryState.getAllIndexesManager();

    // Create all IndexManagers, configure and start them:
    for ( XClass mappedXClass : rootIndexedEntities ) {
      Class mappedClass = classMappings.get( mappedXClass );
      MutableEntityIndexBinding entityIndexBinding = indexesFactory.buildEntityIndexBinding(
          mappedXClass,
          mappedClass,
          searchConfiguration,
          buildContext
      );

      // interceptor might use non indexed state
      if ( entityIndexBinding.getEntityIndexingInterceptor() != null ) {
        optimizationBlackListedTypes.add( mappedXClass );
      }

      // Create all DocumentBuilderIndexedEntity
      // FIXME DocumentBuilderIndexedEntity needs to be built by a helper method receiving Class<T> to infer T properly
      // XClass unfortunately is not (yet) genericized: TODO ?
      TypeMetadata typeMetadata = metadataProvider.getTypeMetadataFor( mappedClass );
      final DocumentBuilderIndexedEntity documentBuilder =
          new DocumentBuilderIndexedEntity(
              mappedXClass,
              typeMetadata,
              configContext,
              searchConfiguration.getReflectionManager(),
              optimizationBlackListedTypes,
              searchConfiguration.getInstanceInitializer()
          );
      entityIndexBinding.setDocumentBuilderIndexedEntity( documentBuilder );

      documentBuildersIndexedEntities.put( mappedClass, entityIndexBinding );
    }

    disableBlackListedTypesOptimization(
        classMappings,
        optimizationBlackListedTypes,
        documentBuildersIndexedEntities,
        documentBuildersContainedEntities
    );
    factoryState.setAnalyzers( configContext.initLazyAnalyzers() );
  }

  /**
   * @param classMappings
   * @param optimizationBlackListX
   * @param documentBuildersIndexedEntities
   * @param documentBuildersContainedEntities
   */
  private void disableBlackListedTypesOptimization(Map<XClass, Class<?>> classMappings,
      Set<XClass> optimizationBlackListX,
      Map<Class<?>, EntityIndexBinding> documentBuildersIndexedEntities,
      Map<Class<?>, DocumentBuilderContainedEntity> documentBuildersContainedEntities) {
    for ( XClass xClass : optimizationBlackListX ) {
      Class<?> type = classMappings.get( xClass );
      if ( type != null ) {
        EntityIndexBinding entityIndexBinding = documentBuildersIndexedEntities.get( type );
        if ( entityIndexBinding != null ) {
          log.tracef( "Dirty checking optimizations disabled for class %s", type );
          entityIndexBinding.getDocumentBuilder().forceStateInspectionOptimizationsDisabled();
        }
        DocumentBuilderContainedEntity documentBuilderContainedEntity = documentBuildersContainedEntities.get(
            type
        );
        if ( documentBuilderContainedEntity != null ) {
          log.tracef( "Dirty checking optimizations disabled for class %s", type );
          documentBuilderContainedEntity.forceStateInspectionOptimizationsDisabled();
        }
      }
    }
  }

  /**
   * prepares XClasses from configuration
   */
  private static Map<XClass, Class<?>> initializeClassMappings(SearchConfiguration cfg, ReflectionManager reflectionManager) {
    Iterator<Class<?>> iter = cfg.getClassMappings();
    Map<XClass, Class<?>> map = new HashMap<XClass, Class<?>>();
    while ( iter.hasNext() ) {
      Class<?> mappedClass = iter.next();
      if ( mappedClass == null ) {
        continue;
      }

      XClass mappedXClass = reflectionManager.toXClass( mappedClass );
      if ( mappedXClass == null ) {
        continue;
      }
      map.put( mappedXClass, mappedClass );
    }
    return map;
  }

  private void bindFilterDefs(XClass mappedXClass) {
    FullTextFilterDef defAnn = mappedXClass.getAnnotation( FullTextFilterDef.class );
    if ( defAnn != null ) {
      bindFilterDef( defAnn, mappedXClass );
    }
    FullTextFilterDefs defsAnn = mappedXClass.getAnnotation( FullTextFilterDefs.class );
    if ( defsAnn != null ) {
      for ( FullTextFilterDef def : defsAnn.value() ) {
        bindFilterDef( def, mappedXClass );
      }
    }
  }

  private void bindFilterDef(FullTextFilterDef defAnn, XClass mappedXClass) {
    if ( factoryState.getFilterDefinitions().containsKey( defAnn.name() ) ) {
      throw new SearchException(
          "Multiple definition of @FullTextFilterDef.name=" + defAnn.name() + ": "
              + mappedXClass.getName()
      );
    }

    bindFullTextFilterDef( defAnn );
  }

  private void bindFullTextFilterDef(FullTextFilterDef defAnn) {
    FilterDef filterDef = new FilterDef( defAnn );
    final Map<String, FilterDef> filterDefinition = factoryState.getFilterDefinitions();
    if ( filterDef.getImpl().equals( ShardSensitiveOnlyFilter.class ) ) {
      //this is a placeholder don't process regularly
      filterDefinition.put( defAnn.name(), filterDef );
      return;
    }
    try {
      filterDef.getImpl().newInstance();
    }
    catch (IllegalAccessException e) {
      throw new SearchException( "Unable to create Filter class: " + filterDef.getImpl().getName(), e );
    }
    catch (InstantiationException e) {
      throw new SearchException( "Unable to create Filter class: " + filterDef.getImpl().getName(), e );
    }
    for ( Method method : filterDef.getImpl().getMethods() ) {
      if ( method.isAnnotationPresent( Factory.class ) ) {
        if ( filterDef.getFactoryMethod() != null ) {
          throw new SearchException(
              "Multiple @Factory methods found" + defAnn.name() + ": "
                  + filterDef.getImpl().getName() + "." + method.getName()
          );
        }
        ReflectionHelper.setAccessible( method );
        filterDef.setFactoryMethod( method );
      }
      if ( method.isAnnotationPresent( Key.class ) ) {
        if ( filterDef.getKeyMethod() != null ) {
          throw new SearchException(
              "Multiple @Key methods found" + defAnn.name() + ": "
                  + filterDef.getImpl().getName() + "." + method.getName()
          );
        }
        ReflectionHelper.setAccessible( method );
        filterDef.setKeyMethod( method );
      }

      String name = method.getName();
      if ( name.startsWith( "set" ) && method.getParameterTypes().length == 1 ) {
        filterDef.addSetter( Introspector.decapitalize( name.substring( 3 ) ), method );
      }
    }
    filterDefinition.put( defAnn.name(), filterDef );
  }

  private void initProgrammaticAnalyzers(ConfigContext context, ReflectionManager reflectionManager) {
    final Map<?, ?> defaults = reflectionManager.getDefaults();

    if ( defaults != null ) {
      AnalyzerDef[] defs = (AnalyzerDef[]) defaults.get( AnalyzerDefs.class );
      if ( defs != null ) {
        for ( AnalyzerDef def : defs ) {
          context.addGlobalAnalyzerDef( def );
        }
      }
    }
  }

  private void initProgrammaticallyDefinedFilterDef(ReflectionManager reflectionManager) {
    Map<?, ?> defaults = reflectionManager.getDefaults();
    FullTextFilterDef[] filterDefs = (FullTextFilterDef[]) defaults.get( FullTextFilterDefs.class );
    if ( filterDefs != null && filterDefs.length != 0 ) {
      final Map<String, FilterDef> filterDefinitions = factoryState.getFilterDefinitions();
      for ( FullTextFilterDef defAnn : filterDefs ) {
        if ( filterDefinitions.containsKey( defAnn.name() ) ) {
          throw new SearchException( "Multiple definition of @FullTextFilterDef.name=" + defAnn.name() );
        }
        bindFullTextFilterDef( defAnn );
      }
    }
  }

  private ReflectionManager getReflectionManager(SearchConfiguration cfg) {
    ReflectionManager reflectionManager = cfg.getReflectionManager();
    return getReflectionManager( reflectionManager );
  }

  private ReflectionManager getReflectionManager(ReflectionManager reflectionManager) {
    if ( reflectionManager == null ) {
      reflectionManager = new JavaReflectionManager();
    }
    return reflectionManager;
  }

  private static String defineIndexingStrategy(SearchConfiguration cfg) {
    String indexingStrategy = cfg.getProperties().getProperty( Environment.INDEXING_STRATEGY, "event" );
    if ( !( "event".equals( indexingStrategy ) || "manual".equals( indexingStrategy ) ) ) {
      throw new SearchException( Environment.INDEXING_STRATEGY + " unknown: " + indexingStrategy );
    }
    return indexingStrategy;
  }

  public ErrorHandler createErrorHandler(SearchConfiguration searchConfiguration) {
    String errorHandlerClassName = searchConfiguration.getProperty( Environment.ERROR_HANDLER );
    if ( StringHelper.isEmpty( errorHandlerClassName ) ) {
      return new LogErrorHandler();
    }
    else if ( "log".equals( errorHandlerClassName.trim() ) ) {
      return new LogErrorHandler();
    }
    else {
      Class<?> errorHandlerClass = searchConfiguration.getClassLoaderService()
          .classForName( errorHandlerClassName );
      return ClassLoaderHelper.instanceFromClass(
          ErrorHandler.class,
          errorHandlerClass,
          "Error Handler"
      );
    }
  }

  /**
   * Implementation of the Hibernate Search SPI WritableBuildContext and WorkerBuildContext
   * The data is provided by the SearchFactoryState object associated to SearchFactoryBuilder.
   */
  private class BuildContext implements WorkerBuildContext {
    private final SearchFactoryState factoryState = SearchFactoryBuilder.this.factoryState;

    @Override
    public SearchFactoryImplementor getUninitializedSearchFactory() {
      return rootFactory;
    }

    @Override
    public String getIndexingStrategy() {
      return factoryState.getIndexingStrategy();
    }

    @Override
    public boolean isTransactionManagerExpected() {
      return cfg.isTransactionManagerExpected();
    }

    @Override
    public IndexManagerHolder getAllIndexesManager() {
      return factoryState.getAllIndexesManager();
    }

    @Override
    public ErrorHandler getErrorHandler() {
      return factoryState.getErrorHandler();
    }

    @Override
    public InstanceInitializer getInstanceInitializer() {
      return factoryState.getInstanceInitializer();
    }

    @Override
    public boolean isIndexMetadataComplete() {
      return factoryState.isIndexMetadataComplete();
    }

    @Override
    public ServiceManager getServiceManager() {
      return factoryState.getServiceManager();
    }

  }
}
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