Hibernate Type源码解析

type 的类图

AssociationType: 关联类型的 type，主要用于外键等相关

IdentifierType: 主键相关的类型 type

BasicType: 基础类型，例如 long,int,string 等基础类型

type 注册

基础类型的注册器

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * 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.type;

import java.io.Serializable;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.hibernate.HibernateException;
import org.hibernate.internal.CoreLogging;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.type.spi.TypeConfiguration;
import org.hibernate.usertype.CompositeUserType;
import org.hibernate.usertype.UserType;

/**
 * A registry of {@link BasicType} instances
 *
 * @author Steve Ebersole
 */
public class BasicTypeRegistry implements Serializable {
   
   
	private static final CoreMessageLogger LOG = CoreLogging.messageLogger( BasicTypeRegistry.class );

	// TODO : analyze these sizing params; unfortunately this seems to be the only way to give a "concurrencyLevel"
	// 使用 ConcurrentHashMap 保证线程安全
	private Map<String, BasicType> registry = new ConcurrentHashMap<>( 100, .75f, 1 );
	private boolean locked;
	private TypeConfiguration typeConfiguration;

	public BasicTypeRegistry(TypeConfiguration typeConfiguration){
   
   
		this();
		this.typeConfiguration = typeConfiguration;
	}

    // 构造方法，用于注册各种对应的基础类型
	public BasicTypeRegistry() {
   
   
		register( BooleanType.INSTANCE );
		register( NumericBooleanType.INSTANCE );
		register( TrueFalseType.INSTANCE );
		register( YesNoType.INSTANCE );

		register( ByteType.INSTANCE );
		register( CharacterType.INSTANCE );
		register( ShortType.INSTANCE );
		register( IntegerType.INSTANCE );
		register( LongType.INSTANCE );
		register( FloatType.INSTANCE );
		register( DoubleType.INSTANCE );
		register( BigDecimalType.INSTANCE );
		register( BigIntegerType.INSTANCE );

		register(