import org.hibernate.search.bridge.StringBridge; //导入依赖的package包/类
@Override
public void delete(
		Class<?> entityClass,
		List<Class<?>> inIndexOf,
		Object id,
		EntityProvider entityProvider,
		Transaction tx) {
	for ( Class<?> indexClass : inIndexOf ) {
		RehashedTypeMetadata metadata = IndexUpdater.this.metadataForIndexRoot.get( indexClass );
		List<String> fields = metadata.getIdFieldNamesForType().get( entityClass );
		for ( String field : fields ) {
			DocumentFieldMetadata metaDataForIdField = metadata.getDocumentFieldMetadataForIdFieldName().get(
					field
			);
			SingularTermDeletionQuery.Type idType = metadata.getSingularTermDeletionQueryTypeForIdFieldName()
					.get( entityClass );
			Object idValueForDeletion;
			if ( idType == SingularTermDeletionQuery.Type.STRING ) {
				FieldBridge fb = metaDataForIdField.getFieldBridge();
				if ( !(fb instanceof StringBridge) ) {
					throw new IllegalArgumentException( "no TwoWayStringBridge found for field: " + field );
				}
				idValueForDeletion = ((StringBridge) fb).objectToString( id );
			}
			else {
				idValueForDeletion = id;
			}
			if ( indexClass.equals( entityClass ) ) {
				this.searchIntegrator.getWorker().performWork(
						new Work(
								entityClass,
								(Serializable) id,
								WorkType.DELETE
						), tx
				);
			}
			else {
				HSQuery hsQuery = this.searchIntegrator
						.createHSQuery()
						.targetedEntities( Collections.singletonList( indexClass ) )
						.luceneQuery(
								this.searchIntegrator.buildQueryBuilder()
										.forEntity( indexClass )
										.get()
										.keyword()
										.onField( field )
										.matching( idValueForDeletion )
										.createQuery()
						);
				int count = hsQuery.queryResultSize();
				int processed = 0;
				// this was just contained somewhere
				// so we have to update the containing entity
				while ( processed < count ) {
					for ( EntityInfo entityInfo : hsQuery.firstResult( processed ).projection(
							ProjectionConstants.ID
					).maxResults( HSQUERY_BATCH )
							.queryEntityInfos() ) {
						Serializable originalId = (Serializable) entityInfo.getProjection()[0];
						Object original = entityProvider.get( indexClass, originalId );
						if ( original != null ) {
							this.update( original, tx );
						}
						else {
							// original is not available in the
							// database, but it will be deleted by its
							// own delete event
							// TODO: log this?
						}
					}
					processed += HSQUERY_BATCH;
				}
			}
		}
	}
}