com.dahuatech.hutool.core.convert.ConverterRegistry Maven / Gradle / Ivy
package com.dahuatech.hutool.core.convert;
import com.dahuatech.hutool.core.bean.BeanUtil;
import com.dahuatech.hutool.core.convert.impl.*;
import com.dahuatech.hutool.core.date.DateTime;
import com.dahuatech.hutool.core.lang.TypeReference;
import com.dahuatech.hutool.core.util.ClassUtil;
import com.dahuatech.hutool.core.util.ObjectUtil;
import com.dahuatech.hutool.core.util.ReflectUtil;
import com.dahuatech.hutool.core.util.TypeUtil;
import java.io.Serializable;
import java.lang.ref.SoftReference;
import java.lang.ref.WeakReference;
import java.lang.reflect.Type;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.net.URI;
import java.net.URL;
import java.nio.charset.Charset;
import java.nio.file.Path;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
/**
* 转换器登记中心
*
* 将各种类型Convert对象放入登记中心,通过convert方法查找目标类型对应的转换器,将被转换对象转换之。
*
*
在此类中,存放着默认转换器和自定义转换器,默认转换器是ICC中预定义的一些转换器,自定义转换器存放用户自定的转换器。
*
* @author Looly
*/
public class ConverterRegistry implements Serializable {
private static final long serialVersionUID = 1L;
/** 默认类型转换器 */
private Map> defaultConverterMap;
/** 用户自定义类型转换器 */
private volatile Map> customConverterMap;
public ConverterRegistry() {
defaultConverter();
}
/**
* 获得单例的 {@link ConverterRegistry}
*
* @return {@link ConverterRegistry}
*/
public static ConverterRegistry getInstance() {
return SingletonHolder.instance;
}
/**
* 登记自定义转换器
*
* @param type 转换的目标类型
* @param converterClass 转换器类,必须有默认构造方法
* @return {@link ConverterRegistry}
*/
public ConverterRegistry putCustom(Type type, Class extends Converter>> converterClass) {
return putCustom(type, ReflectUtil.newInstance(converterClass));
}
/**
* 登记自定义转换器
*
* @param type 转换的目标类型
* @param converter 转换器
* @return {@link ConverterRegistry}
*/
public ConverterRegistry putCustom(Type type, Converter> converter) {
if (null == customConverterMap) {
synchronized (this) {
if (null == customConverterMap) {
customConverterMap = new ConcurrentHashMap<>();
}
}
}
customConverterMap.put(type, converter);
return this;
}
/**
* 获得转换器
*
* @param 转换的目标类型
* @param type 类型
* @param isCustomFirst 是否自定义转换器优先
* @return 转换器
*/
public Converter getConverter(Type type, boolean isCustomFirst) {
Converter converter = null;
if (isCustomFirst) {
converter = this.getCustomConverter(type);
if (null == converter) {
converter = this.getDefaultConverter(type);
}
} else {
converter = this.getDefaultConverter(type);
if (null == converter) {
converter = this.getCustomConverter(type);
}
}
return converter;
}
/**
* 获得默认转换器
*
* @param 转换的目标类型(转换器转换到的类型)
* @param type 类型
* @return 转换器
*/
@SuppressWarnings("unchecked")
public Converter getDefaultConverter(Type type) {
return (null == defaultConverterMap) ? null : (Converter) defaultConverterMap.get(type);
}
/**
* 获得自定义转换器
*
* @param 转换的目标类型(转换器转换到的类型)
* @param type 类型
* @return 转换器
*/
@SuppressWarnings("unchecked")
public Converter getCustomConverter(Type type) {
return (null == customConverterMap) ? null : (Converter) customConverterMap.get(type);
}
/**
* 转换值为指定类型
*
* @param 转换的目标类型(转换器转换到的类型)
* @param type 类型目标
* @param value 被转换值
* @param defaultValue 默认值
* @param isCustomFirst 是否自定义转换器优先
* @return 转换后的值
* @throws ConvertException 转换器不存在
*/
@SuppressWarnings("unchecked")
public T convert(Type type, Object value, T defaultValue, boolean isCustomFirst)
throws ConvertException {
if (TypeUtil.isUnknow(type) && null == defaultValue) {
// 对于用户不指定目标类型的情况,返回原值
return (T) value;
}
if (ObjectUtil.isNull(value)) {
return defaultValue;
}
if (TypeUtil.isUnknow(type)) {
type = defaultValue.getClass();
}
if (type instanceof TypeReference) {
type = ((TypeReference>) type).getType();
}
// 标准转换器
final Converter converter = getConverter(type, isCustomFirst);
if (null != converter) {
return converter.convert(value, defaultValue);
}
Class rowType = (Class) TypeUtil.getClass(type);
if (null == rowType) {
if (null != defaultValue) {
rowType = (Class) defaultValue.getClass();
} else {
// 无法识别的泛型类型,按照Object处理
return (T) value;
}
}
// 特殊类型转换,包括Collection、Map、强转、Array等
final T result = convertSpecial(type, rowType, value, defaultValue);
if (null != result) {
return result;
}
// 尝试转Bean
if (BeanUtil.isBean(rowType)) {
return new BeanConverter(type).convert(value, defaultValue);
}
// 无法转换
throw new ConvertException("No Converter for type [{}]", rowType.getName());
}
/**
* 转换值为指定类型
* 自定义转换器优先
*
* @param 转换的目标类型(转换器转换到的类型)
* @param type 类型
* @param value 值
* @param defaultValue 默认值
* @return 转换后的值
* @throws ConvertException 转换器不存在
*/
public T convert(Type type, Object value, T defaultValue) throws ConvertException {
return convert(type, value, defaultValue, true);
}
/**
* 转换值为指定类型
*
* @param 转换的目标类型(转换器转换到的类型)
* @param type 类型
* @param value 值
* @return 转换后的值,默认为null
* @throws ConvertException 转换器不存在
*/
public T convert(Type type, Object value) throws ConvertException {
return convert(type, value, null);
}
/**
* 特殊类型转换
* 包括:
*
*
* Collection
* Map
* 强转(无需转换)
* 数组
*
*
* @param 转换的目标类型(转换器转换到的类型)
* @param type 类型
* @param value 值
* @param defaultValue 默认值
* @return 转换后的值
*/
@SuppressWarnings("unchecked")
private T convertSpecial(Type type, Class rowType, Object value, T defaultValue) {
if (null == rowType) {
return null;
}
// 集合转换(不可以默认强转)
if (Collection.class.isAssignableFrom(rowType)) {
final CollectionConverter collectionConverter = new CollectionConverter(type);
return (T) collectionConverter.convert(value, (Collection>) defaultValue);
}
// Map类型(不可以默认强转)
if (Map.class.isAssignableFrom(rowType)) {
final MapConverter mapConverter = new MapConverter(type);
return (T) mapConverter.convert(value, (Map, ?>) defaultValue);
}
// 默认强转
if (rowType.isInstance(value)) {
return (T) value;
}
// 数组转换
if (rowType.isArray()) {
final ArrayConverter arrayConverter = new ArrayConverter(rowType);
try {
return (T) arrayConverter.convert(value, defaultValue);
} catch (Exception e) {
// 数组转换失败进行下一步
}
}
// 枚举转换
if (rowType.isEnum()) {
return (T) new EnumConverter(rowType).convert(value, defaultValue);
}
// 表示非需要特殊转换的对象
return null;
}
// ----------------------------------------------------------- Private method start
/**
* 注册默认转换器
*
* @return 转换器
*/
private ConverterRegistry defaultConverter() {
defaultConverterMap = new ConcurrentHashMap<>();
// 原始类型转换器
defaultConverterMap.put(int.class, new PrimitiveConverter(int.class));
defaultConverterMap.put(long.class, new PrimitiveConverter(long.class));
defaultConverterMap.put(byte.class, new PrimitiveConverter(byte.class));
defaultConverterMap.put(short.class, new PrimitiveConverter(short.class));
defaultConverterMap.put(float.class, new PrimitiveConverter(float.class));
defaultConverterMap.put(double.class, new PrimitiveConverter(double.class));
defaultConverterMap.put(char.class, new PrimitiveConverter(char.class));
defaultConverterMap.put(boolean.class, new PrimitiveConverter(boolean.class));
// 包装类转换器
defaultConverterMap.put(Number.class, new NumberConverter());
defaultConverterMap.put(Integer.class, new NumberConverter(Integer.class));
defaultConverterMap.put(
AtomicInteger.class, new NumberConverter(AtomicInteger.class)); // since 3.0.8
defaultConverterMap.put(Long.class, new NumberConverter(Long.class));
defaultConverterMap.put(AtomicLong.class, new NumberConverter(AtomicLong.class)); // since 3.0.8
defaultConverterMap.put(Byte.class, new NumberConverter(Byte.class));
defaultConverterMap.put(Short.class, new NumberConverter(Short.class));
defaultConverterMap.put(Float.class, new NumberConverter(Float.class));
defaultConverterMap.put(Double.class, new NumberConverter(Double.class));
defaultConverterMap.put(Character.class, new CharacterConverter());
defaultConverterMap.put(Boolean.class, new BooleanConverter());
defaultConverterMap.put(AtomicBoolean.class, new AtomicBooleanConverter()); // since 3.0.8
defaultConverterMap.put(BigDecimal.class, new NumberConverter(BigDecimal.class));
defaultConverterMap.put(BigInteger.class, new NumberConverter(BigInteger.class));
defaultConverterMap.put(CharSequence.class, new StringConverter());
defaultConverterMap.put(String.class, new StringConverter());
// URI and URL
defaultConverterMap.put(URI.class, new URIConverter());
defaultConverterMap.put(URL.class, new URLConverter());
// 日期时间
defaultConverterMap.put(Calendar.class, new CalendarConverter());
defaultConverterMap.put(java.util.Date.class, new DateConverter(java.util.Date.class));
defaultConverterMap.put(DateTime.class, new DateConverter(DateTime.class));
defaultConverterMap.put(java.sql.Date.class, new DateConverter(java.sql.Date.class));
defaultConverterMap.put(java.sql.Time.class, new DateConverter(java.sql.Time.class));
defaultConverterMap.put(java.sql.Timestamp.class, new DateConverter(java.sql.Timestamp.class));
// Reference
defaultConverterMap.put(
WeakReference.class, new ReferenceConverter(WeakReference.class)); // since 3.0.8
defaultConverterMap.put(
SoftReference.class, new ReferenceConverter(SoftReference.class)); // since 3.0.8
defaultConverterMap.put(AtomicReference.class, new AtomicReferenceConverter()); // since 3.0.8
// 其它类型
defaultConverterMap.put(Class.class, new ClassConverter());
defaultConverterMap.put(TimeZone.class, new TimeZoneConverter());
defaultConverterMap.put(Locale.class, new LocaleConverter());
defaultConverterMap.put(Charset.class, new CharsetConverter());
defaultConverterMap.put(Path.class, new PathConverter());
defaultConverterMap.put(Currency.class, new CurrencyConverter()); // since 3.0.8
defaultConverterMap.put(UUID.class, new UUIDConverter()); // since 4.0.10
defaultConverterMap.put(
StackTraceElement.class, new StackTraceElementConverter()); // since 4.5.2
// JDK8+
try {
Class> clazz;
for (String className : Jdk8DateConverter.supportClassNames) {
clazz = ClassUtil.loadClass(className);
defaultConverterMap.put(clazz, new Jdk8DateConverter(clazz)); // since 4.5.1
}
} catch (Exception e) {
// ignore
// 在使用jdk8以下版本时,其转换器自动跳过失效
}
return this;
}
/** 类级的内部类,也就是静态的成员式内部类,该内部类的实例与外部类的实例 没有绑定关系,而且只有被调用到才会装载,从而实现了延迟加载 */
private static class SingletonHolder {
/** 静态初始化器,由JVM来保证线程安全 */
private static ConverterRegistry instance = new ConverterRegistry();
}
// ----------------------------------------------------------- Private method end
}