org.hibernate.tuple.GenerationTiming#ALWAYS源码实例Demo

private ValueGeneration determineValueGenerationStrategy(XProperty property) {
	ValueGeneration valueGeneration = getValueGenerationFromAnnotations( property );

	if ( valueGeneration == null ) {
		return NoValueGeneration.INSTANCE;
	}

	final GenerationTiming when = valueGeneration.getGenerationTiming();

	if ( valueGeneration.getValueGenerator() == null ) {
		insertable = false;
		if ( when == GenerationTiming.ALWAYS ) {
			updatable = false;
		}
	}

	return valueGeneration;
}
 

private boolean timingsMatch(GenerationTiming timing, GenerationTiming matchTiming) {
	return
			( matchTiming == GenerationTiming.INSERT && timing.includesInsert() ) ||
					( matchTiming == GenerationTiming.ALWAYS && timing.includesUpdate() );
}
 

public GenerationStrategyPair buildPair() {
	if ( hadInMemoryGeneration && hadInDatabaseGeneration ) {
		throw new ValueGenerationStrategyException(
				"Composite attribute [" + mappingProperty.getName() + "] contained both in-memory"
						+ " and in-database value generation"
		);
	}
	else if ( hadInMemoryGeneration ) {
		throw new NotYetImplementedException( "Still need to wire in composite in-memory value generation" );

	}
	else if ( hadInDatabaseGeneration ) {
		final Component composite = (Component) mappingProperty.getValue();

		// we need the numbers to match up so we can properly handle 'referenced sql column values'
		if ( inDatabaseStrategies.size() != composite.getPropertySpan() ) {
			throw new ValueGenerationStrategyException(
					"Internal error : mismatch between number of collected in-db generation strategies" +
							" and number of attributes for composite attribute : " + mappingProperty.getName()
			);
		}

		// the base-line values for the aggregated InDatabaseValueGenerationStrategy we will build here.
		GenerationTiming timing = GenerationTiming.INSERT;
		boolean referenceColumns = false;
		String[] columnValues = new String[ composite.getColumnSpan() ];

		// start building the aggregate values
		int propertyIndex = -1;
		int columnIndex = 0;
		Iterator subProperties = composite.getPropertyIterator();
		while ( subProperties.hasNext() ) {
			propertyIndex++;
			final Property subProperty = (Property) subProperties.next();
			final InDatabaseValueGenerationStrategy subStrategy = inDatabaseStrategies.get( propertyIndex );

			if ( subStrategy.getGenerationTiming() == GenerationTiming.ALWAYS ) {
				// override the base-line to the more often "ALWAYS"...
				timing = GenerationTiming.ALWAYS;

			}
			if ( subStrategy.referenceColumnsInSql() ) {
				// override base-line value
				referenceColumns = true;
			}
			if ( subStrategy.getReferencedColumnValues() != null ) {
				if ( subStrategy.getReferencedColumnValues().length != subProperty.getColumnSpan() ) {
					throw new ValueGenerationStrategyException(
							"Internal error : mismatch between number of collected 'referenced column values'" +
									" and number of columns for composite attribute : " + mappingProperty.getName() +
									'.' + subProperty.getName()
					);
				}
				System.arraycopy(
						subStrategy.getReferencedColumnValues(),
						0,
						columnValues,
						columnIndex,
						subProperty.getColumnSpan()
				);
			}
		}

		// then use the aggregated values to build the InDatabaseValueGenerationStrategy
		return new GenerationStrategyPair(
				new InDatabaseValueGenerationStrategyImpl( timing, referenceColumns, columnValues )
		);
	}
	else {
		return NO_GEN_PAIR;
	}
}
 

private void bindProperty(
		MappingDocument mappingDocument,
		AttributeSource propertySource,
		Property property) {
	property.setName( propertySource.getName() );

	if ( StringHelper.isNotEmpty( propertySource.getXmlNodeName() ) ) {
		DeprecationLogger.DEPRECATION_LOGGER.logDeprecationOfDomEntityModeSupport();
	}

	property.setPropertyAccessorName(
			StringHelper.isNotEmpty( propertySource.getPropertyAccessorName() )
					? propertySource.getPropertyAccessorName()
					: mappingDocument.getMappingDefaults().getImplicitPropertyAccessorName()
	);

	if ( propertySource instanceof CascadeStyleSource ) {
		final CascadeStyleSource cascadeStyleSource = (CascadeStyleSource) propertySource;

		property.setCascade(
				StringHelper.isNotEmpty( cascadeStyleSource.getCascadeStyleName() )
						? cascadeStyleSource.getCascadeStyleName()
						: mappingDocument.getMappingDefaults().getImplicitCascadeStyleName()
		);
	}

	property.setOptimisticLocked( propertySource.isIncludedInOptimisticLocking() );

	if ( propertySource.isSingular() ) {
		final SingularAttributeSource singularAttributeSource = (SingularAttributeSource) propertySource;

		property.setInsertable( singularAttributeSource.isInsertable() );
		property.setUpdateable( singularAttributeSource.isUpdatable() );

		// NOTE : Property#is refers to whether a property is lazy via bytecode enhancement (not proxies)
		property.setLazy( singularAttributeSource.isBytecodeLazy() );

		final GenerationTiming generationTiming = singularAttributeSource.getGenerationTiming();
		if ( generationTiming == GenerationTiming.ALWAYS || generationTiming == GenerationTiming.INSERT ) {
			// we had generation specified...
			//   	HBM only supports "database generated values"
			property.setValueGenerationStrategy( new GeneratedValueGeneration( generationTiming ) );

			// generated properties can *never* be insertable...
			if ( property.isInsertable() ) {
				log.debugf(
						"Property [%s] specified %s generation, setting insertable to false : %s",
						propertySource.getName(),
						generationTiming.name(),
						mappingDocument.getOrigin()
				);
				property.setInsertable( false );
			}

			// properties generated on update can never be updatable...
			if ( property.isUpdateable() && generationTiming == GenerationTiming.ALWAYS ) {
				log.debugf(
						"Property [%s] specified ALWAYS generation, setting updateable to false : %s",
						propertySource.getName(),
						mappingDocument.getOrigin()
				);
				property.setUpdateable( false );
			}
		}
	}

	property.setMetaAttributes( propertySource.getToolingHintContext().getMetaAttributeMap() );

	if ( log.isDebugEnabled() ) {
		final StringBuilder message = new StringBuilder()
				.append( "Mapped property: " )
				.append( propertySource.getName() )
				.append( " -> [" );
		final Iterator itr = property.getValue().getColumnIterator();
		while ( itr.hasNext() ) {
			message.append( ( (Selectable) itr.next() ).getText() );
			if ( itr.hasNext() ) {
				message.append( ", " );
			}
		}
		message.append( "]" );
		log.debug( message.toString() );
	}
}
 

public GenerationTiming getGenerationTiming() {
	return GenerationTiming.ALWAYS;
}
 

public GenerationTiming getGenerationTiming() {
	return GenerationTiming.ALWAYS;
}